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Transient responsive

Subclass of:

361 - Electricity: electrical systems and devices

361001000 - SAFETY AND PROTECTION OF SYSTEMS AND DEVICES

Patent class list (only not empty are listed)

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Class / Patent application numberDescriptionNumber of patent applications / Date published
361111000 Transient responsive 89
20090303652METHOD AND APPARATUS FOR REDUCING DIFFERENTIAL MODE AND COMMON MODE REFLECTIONS IN MOTOR DRIVES - A filter device reduces reflections on power lines from the motor drive to AC motors by providing a differential mode choke in series with a common mode choke both shunted by resistances tailored to the characteristic impedance of the power cable for differential mode and common mode reflections respectively. By treating both common mode based and differential mode based reflections, superior transient control and motor drive performance may be obtained.12-10-2009
20080259516PROTECTOR FOR INSTANT DRIVING CIRCUIT OF ELECTRIC DEVICE - A protector for an instant driving circuit of an electric device comprises a driving device and a voltage stabilizing device, the driving device being serially connected to the voltage stabilizing device. When the protector is connected to a driving circuit of an electric device, after the switch of a power source is turned on, a current of high voltage of the power source flows into the voltage stabilizing device, and the two conductive plates installed inside the sealed tube of the voltage stabilizing device are electrically conducted due to the function of a gas filled in the sealed tube of the voltage stabilizing device, and a current flows into the driving device. The spring plate having a semiconductor chip is then instantly separated from the other spring plate for a very short time and then returns back to contact together with the other spring plate, so as to trigger the electric device(s). Meanwhile, the extra current of the power source is consumed in the electric resistant wire, such that the surge current instantly generated from power source is consumed, and damage to the electric device due to the surge current is prevented.10-23-2008
20120176717CATEGORY 6A SURGE PROTECTOR - A surge protector for protecting telecommunications related equipment and other associated sensitive electrical components from over-voltage transient occurring on tip/ring conductors of communication lines coupled thereto includes a printed circuit board and surge protection circuits mounted on the printed circuit board. The surge protection circuits are interconnected between incoming tip and ring terminals defining an unprotected side and outgoing tip and ring terminals defining a protected side. Each of the surge protection circuits has a first set of steering diodes, a pair of series-connected voltage clamping devices, and a second set of steering diodes. Input side connector devices are coupled to the respective incoming tip and ring terminals for connecting to incoming telecommunication lines. Output side connector devices are coupled to the respective outgoing tip and ring terminals for connecting to customers' electrical equipment to be protected.07-12-2012
20100328833POWER MODULE WITH ADDITIONAL TRANSIENT CURRENT PATH AND POWER MODULE SYSTEM - The present invention relates to power modules for controlling an input current to provide an output current, in particular, to such a power module (12-30-2010
20120182663ESD PROTECTION AGAINST CHARGE COUPLING - This document discusses among other things apparatus and methods for reducing ESD damage to buffer circuits. In an example, an output buffer can include an output, a first transistor configured to couple the output to a high logic supply rail, a second transistor configured to couple the output node to a low logic supply rail, pre-driver logic configured to drive a gate of the first transistor and a gate of the second transistor, and a first resistor configured to reduce electrostatic discharge (ESD) induced current between the first transistor and the pre-driver logic.07-19-2012
20120182662Inrush Current Protection Circuit - An inrush current protection circuit for charging a load to a target voltage, in which the inrush current protection circuit includes a first charging circuit and a second charging circuit. The first charging circuit charges a load to a first stage voltage, and there is a voltage difference existing between the target voltage and the first stage voltage. The second charging circuit charges the load form the first stage voltage to the target voltage, in which the first charge circuit charges slower than the second charging circuit.07-19-2012
20110002075COMPOSITE ELECTRONIC DEVICE - The present invention is provided with a composite electronic device comprising an inductor element and an ESD protection element formed between two magnetic substrates, wherein the inductor element includes insulation layers made of a resin, and spiral conductors formed on the insulation layers, the ESD protection element includes a base insulation layer, a pair of gap electrodes arranged via gap formed therebetween on the base insulation layer, and an ESD absorbing layer arranged at least between the gap electrodes, and the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material. The gap of the ESD protection element is provided at exterior of the spiral conductor so as not to be overlapped with the spiral conductor in view of a laminating direction.01-06-2011
20090303651Single-Phase Transient Voltage Suppression Circuit - In accordance with the disclosed subject matter herein, an apparatus for suppressing in a split-phase power system, effects of line-to-ground transient voltage spikes, balancing phase voltage with respect to ground, filtering phase voltage harmonics, cleaning up electrical noise in a split-phase power system, redirecting energy and absorbing electrical noise, protecting or replacing typical TVSS (transient voltage surge suppressor) units. The apparatus of the present invention can not be damaged by electrical noise. It uses virtually no energy in monitor mode and cannot draw over 3 amps. The apparatus of the present invention can be applied to single-phase lines from center tapped delta power transformers.12-10-2009
20120218675Transient blocking unit with strong reset capability - Transient blocking unit reset capability is improved by adding one or more transistors in parallel to one of the main blocking transistors of the circuit. These additional transistors switch off at higher voltages than their corresponding main blocking transistor, and have higher on-resistances than their corresponding main blocking transistor. The resulting transient blocking unit characteristic has two or more different slopes in the negative differential resistance part of the circuit I-V characteristic. This piecewise linear behavior can be exploited to ensure that the circuit I-V characteristic only has a single intersection with a normal load characteristic. By satisfying this condition, automatic reset is ensured, because the combination of the transient blocking unit with any load that is consistent with the normal load characteristic will have only one stable operating point.08-30-2012
20090015978Non-inductive silicon transient voltage suppressor - A transient voltage suppressor (TVS) with virtually no inductance in a shunt current path, thus providing optimal fast-rise transient voltage spike protection. A planar thru-conductor is operably coupled to the entire length of a cathode side surface of a TVS chip thereby reducing the inductance through the TVS chip to ground. The virtually zero inductance through the shunt current path allows the TVS chip to effectively limit fast-rise transient voltage spikes to safe levels, and prevents generating leak-thru energy that could cause a latch-up condition or destructive effects. Provision is made to suppress long duration transient pulses is available through affixing the TVS to a larger thermal mass providing the necessary heat sinking to absorb the additional power dissipated during these events.01-15-2009
20090268364High power integrating power conditioner - A high-power transient suppressor, having an input from a power source and an output to a load, includes a first power device coupled between the input and the output, a first transient detector to monitor an input voltage and to turn off the first power device in response to the input voltage exceeding a first threshold voltage, a second power device coupled between the input and the output, an integrator capacitor coupled to the output, and a second transient detector to monitor an output voltage, to switch off the second power device in response to the output voltage exceeding a second threshold voltage, and to turn on the second power device in response to the integrator capacitor discharging below the second threshold voltage.10-29-2009
20120224291ELECTRICAL CIRCUIT WITH SURGE PROTECTION MONITORING - An electrical circuit comprising a power supply, a load and a surge protection device adapted to protect said load and/or power supply from electrical fast transient events according to the requirements of IEC 61000-4-2 or 4 and which comprises a stress threshold, in which the electrical circuit further comprises a monitoring device adapted to monitor the current in said surge protection device and detect the breaching of said threshold by electrical fast transient events.09-06-2012
20130063855VERY FAST TRANSIENT SUPPRESSING DEVICE - The subject of the invention is a device for suppressing very fast transients (03-14-2013
20090237854VOLTAGE REGULATOR WITH TRANSIENT RECOVERY CIRCUIT - A power controller having good transient performance and including a voltage regulator and one or more (K) transient recovery circuits is described. The voltage regulator receives a supply voltage and generates a regulator output signal used to generate K output voltages for K loads. Each transient recovery circuit detects for transients in a respective output voltage and corrects the detected transients. In one design, the transient recovery circuit compares the output voltage against a low threshold voltage, detects a low transient when the output voltage is below the low threshold voltage, and couples the output voltage to a high voltage to correct the low transient. Alternatively or additionally, the transient recovery circuit compares the output voltage against a high threshold voltage, detects a high transient when the output voltage is above the high threshold voltage, and couples the output voltage to a low voltage to correct the high transient.09-24-2009
20100061028System for managing electrical consumption with coaxial communication line protection - A system for managing electrical consumption includes a connection to an incoming power supply of a facility, for connection in parallel, including a hot line and a neutral line, and at least one ground. The following components are connected between the hot line and the neutral line. They are connected in the order of at least one front capacitor, at least one front arc suppressor, at least one front metal oxide varistor line transient voltage surge suppressor having a predetermined number of joules capability to suppress undesired power spikes, at least two inductor/metal oxide varistor iterative transformers, at least a second capacitor, at least one metal oxide varistor having a predetermined number of joules capability and at least two capacitors, each having predetermined capacitance different from one another. Arranged in parallel, a coaxial communication line segment, with a coaxial cable input connector and a coaxial cable output connected, has a line segment hot wire and a line segment ground wire connected to a coaxial cable snubber circuit. The coaxial cable snubber circuit has a snubber and at least one metal oxide varistor.03-11-2010
20090027822Transient blocking unit having a fab-adjustable threshold current - A transient blocking unit (TBU) is a transistor circuit that is normally on, but rapidly and automatically switches to a high-resistance current blocking state when a current threshold is exceeded, thereby protecting a series connected load from over-voltage or over-current conditions. Process variation of transistor threshold voltage and on-resistance can cause undesirable variation of the TBU threshold current and/or of TBU resistance. Control of TBU threshold current and/or resistance is improved by providing for trimming the TBU during its fabrication to provide a one-time adjustment of the threshold current or resistance. Such trimming can be done with a resistive trimming circuit placed in series with the on-resistance of the relevant TBU transistor. Alternatively, a segmented TBU transistor having an on-resistance that is adjustable by way of wire bonding during fabrication can be employed.01-29-2009
20120293904APPARATUS AND METHOD FOR INTEGRATED CIRCUIT PROTECTION - Apparatus and methods for integrated circuit protection are provided. In one embodiment, an integrated circuit (IC) includes a first pad, a second pad, a third pad, a first protection subcircuit coupled between the first pad and a common node, a second protection subcircuit coupled between the second pad and the common node, and a third protection subcircuit coupled between the third pad and the common node. The first, second, and third protection subcircuits each include one or more building blocks for maintaining the voltage of each of the pads within a predefined safe range, as well as to maintain the voltage between each of the pads within acceptable limits. A portion of the building blocks used to provide transient signal protection can be shared between pads, thereby reducing the area of the pad protection circuit relative to a scheme using a separate stack of building blocks for each pad.11-22-2012
20090257166Transient Voltage Protection Device, Material, and Manufacturing Methods - A transient voltage suppression device includes a dielectric layer defining a receptacle for a variable impedance material proximate a gapped electrode. Methods for manufacturing the device and for formulating a variable voltage material at lower cost and with higher manufacturing yields is also provided.10-15-2009
20090021881OVERVOLTAGE PROTECTION DEVICE WITH IMPROVED LEAKAGE-CURRENT-INTERRUPTING CAPACITY - A device for protecting an electrical installation (01-22-2009
20090279224TRANSIENT VOLTAGE COMPENSATION SYSTEM AND METHOD - A transient voltage compensation system is provided. The transient voltage compensation system includes a processor and a first voltage regulator coupled to the processor, wherein the first voltage regulator is to deliver a load current to the processor at an output voltage. The transient voltage compensation system also includes a second voltage regulator coupled to the first voltage regulator, wherein the second voltage regulator is to regulate the output voltage in response to transient loads of the processor.11-12-2009
20090284887Protective device - A device for protecting a radio frequency transmission line from transient voltages includes an inner conductor for transmitting communication signals of a desired frequency band and a grounded, coaxial outer conductor electrically insulated from the inner conductor by a pair of annular insulators. As one feature of the invention, a tap conductor for discharging transient voltages carried by the inner conductor that fall outside the desired frequency band is coupled at one end to the inner conductor through a press-fit connection. As another feature of the invention, a pair of high-quality contacts are mounted onto opposite ends of the outer conductor and serve, together with the inner conductor, as the only electrical contact surfaces for the protective device that transmit the desired communication signals. As another feature of the invention, each insulator has a constant outer diameter along the entirety of its length and a variable inner diameter.11-19-2009
20080212250CIRCUIT FOR PREVENTING SURGE, CONNECTOR AND ELECTRONIC APPARATUS THEREOF - A surge protection circuit and a connector and an electronic apparatus using the circuit are provided. The connector includes a plurality of metal lines, a plurality of resistors, a ground metal, and a capacitor. Each metal line has a pointed end. There is a distance between the pointed end of the metal lines and a pointed end of the first end of each resistor corresponding to the metal line. The capacitor is coupled between the ground metal and second end of the resistors. Thus the surge endurance of product can be increased by the invention, and the damage to the internal components of product can be prevented.09-04-2008
20110007444ELECTRICAL INTERFACE PROTECTING APPARATUS - The electrical interface protecting apparatus is coupled between the wall-outlet and connected equipment to solve the difficulty of keeping broadband over power line modems and connected equipment safe from lightning and power surges while at the same time functions effectively. The apparatus includes a low pass filter to prevent symmetrical signals from being attenuated and also an electromagnetic interference filter to provide clean and safe power at another outlet while preventing noise generated by connected equipment from being injected into the power line. It also provides a grounding means which reduces the leakage current flowing into the earth ground.01-13-2011
20080218925MOV FAILURE MODE IDENTIFICATION - A surge protector includes a thermal fuse, a metal oxide varistor electrically connected in series relation to the thermal fuse, and a detection network electrically connected in parallel relation to the thermal fuse and the metal oxide varistor. A first indicating means indicates whether or not the thermal fuse is in operation and a second indicating means indicates whether or not the metal oxide varistor is in operation.09-11-2008
20090128977Method to protect Ethernet connected products - The present invention relates to a method for protecting electronic products, which electronic product comprises an Ethernet connector, where the Ethernet connector comprises a protection circuit, which circuit comprises at least one capacitor and at least one resister, where the Ethernet connector is used to protect against high energy transients, where the Ethernet connector comprises a protection circuitry. Where the Ethernet connector comprises a protection circuitry, which protection circuitry is characterized in that in the protection circuitry is the electrically product ground and Ethernet ground connected by at least a VDR (Voltage Dependant Resistor), which VDR is connected between the Ethernet ground and the product ground in the protection circuitry.05-21-2009
20090128976Energy Pathway Arrangements for Energy Conditioning - The system of an energy conditioner comprising: a conductive shield structure comprising a first conductive shield layer, a second conductive shield layer, and a third conductive shield layer; wherein said first conductive shield layer is above said second conductive shield layer, and said second conductive shield layer is above said third conductive shield layer; wherein said first conductive shield layer, said second conductive shield layer, and said third conductive shield layer are conductively connected to one another; a first pair of conductive non-shield layers comprising a first pair first layer and a first pair second layer; and a second pair of conductive non-shield layers comprising a second pair first layer and a second pair second layer05-21-2009
20120069483PROTECTION DEVICE, COMPLEMENTARY PROTECTION DEVICE, SIGNAL OUTPUT DEVICE, LATCH-UP PREVENTING METHOD, AND COMPUTER-READABLE MEDIUM - A protection device includes: a serial element unit that includes a first switching element and a resistive element, one end being connected to a control terminal of a protection-target switching element, the other end being connected to a first voltage line, the protection-target switching element including a first terminal connected to the first voltage line, a second terminal connected to a second voltage line and an inductor unit, and the control terminal, the protection-target switching element switching a conduction state at the normal time to a non-conduction state between the first terminal and the second terminal when an off-voltage is applied to the control terminal; a capacitance provided at the protection-target switching element and has a predetermined capacitance value; and a controller that performs control such that the first switching element is in a conduction state if the protection-target switching element is put into a non-conduction state.03-22-2012
20100277847Solid-State Disconnect Device - A solid-state disconnect device capable of isolating and protecting circuits and equipment from overloads and undesired transients is presented. The protection device includes at least one depletion mode circuit block having three terminals (drain, gate, and source), which in its simplest form is implemented by a single n-channel depletion mode field-effect transistor, and two enhancement mode circuit blocks each having three terminals (drain, gate and source), each implemented in simplest form by a single n-channel enhancement mode field-effect transistor. The current conducting path of the first enhancement mode circuit block is connected in series with the current conducting path of the depletion mode circuit block. The drain terminal of the second enhancement mode circuit block is connected through a current limiting load to both the gate terminal of the second enhancement mode circuit block and the drain terminal of the first enhancement mode circuit block. The gate terminal of the first enhancement mode circuit block is connected to the drain terminal of the second enhancement mode circuit block. The source terminals of the two enhancement circuit blocks are both connected to the gate terminal of the depletion mode circuit block. Unidirectional and bidirectional embodiments are disclosed.11-04-2010
20090213518Voltage surge protection device comprising selective disconnection means - A voltage surge protection device comprising a disconnection device with electric contacts said disconnection device comprising a first connecting electrode electrically connected with a first connecting strip, a second connecting electrode electrically connected with a second connecting strip, and a third switching electrode electrically connected to the second connecting strip. The protection device comprises a surge arrestor connected in series with a thermal disconnector between the third movable arc switching electrode and the second connecting strip. Said thermal disconnector comprises at least one fuse element extending between a first and second conducting radial wall of an arc extinguishing chamber, said arc extinguishing chamber comprising at least one conducting separator.08-27-2009
20080316668METHODS AND APPARATUSES FOR PERFORMING COMMON MODE PULSE COMPENSATION IN AN OPTO-ISOLATOR - In an opto-isolator, common mode pulses that occur are compensated for by either adding current to the electrical-to-optical converter (EOC) drive current to compensate for a decrease in the EOC drive current caused by the occurrence of a common mode pulse or by pulling some of the drive current away from the EOC to compensate for an increase in the EOC drive current caused by the occurrence of a common mode pulse.12-25-2008
20090244799LATCH-UP PROTECTION CIRCUIT FOR LCD DRIVER IC - A latch-up protection circuit for LCD driver is provided. The latch-up protection circuit for LCD driver comprises an NMOS, a switch and a capacitor. The NMOS comprises a drain electrically connected to a ground; a source electrically connected to a negative voltage source; and a gate. The switch is electrically connected to the gate to receive a control signal, wherein the switch switches between a positive voltage source and the negative voltage source according to the control signal; and the capacitor is electrically connected to the positive voltage source and the gate.10-01-2009
20120194959ELECTRONIC DEVICE WITH SURGE SUPPRESSION UNIT - An electronic device includes a power input pin receiving a voltage from an external power supply, a load, and a surge suppression unit connected between the power input pin and the load. The surge suppression unit includes a first transistor, a voltage divider circuit and a capacitor. The first transistor includes a control end, a first conducting end connected to the power input pin, and a second conducting end connected to the load. The voltage divider circuit includes a common node connected to the control end, one end of the voltage divider circuit connected between the first conducting end and the power input pin, and the other end of the voltage divider circuit connected to ground. One end of the capacitor is connected between the second conducting end and the load, and the other end of the capacitor is connected to the control end.08-02-2012
20100039743Electrostatic discharge protection circuit - An electrostatic discharge (ESD) protection circuit is disclosed, which comprises an ESD detection circuit and protection switches. If an ESD event occurs, the ESD detection circuit turns off the protection switches so as to protect an application circuit provided in integrated circuits (IC) from being damaged by the electrostatic discharge, and if not, the ESD detection circuit turns on the protection switches so as to make the application circuit provided in integrated circuits (IC) function normally.02-18-2010
20090161281Capacitor sharing surge protection circuit - A capacitor sharing surge protection circuit for protecting multiple ports from harmful energy surges, such as electrostatic discharge (ESD) and cable discharge events (CDE), is provided. The protection circuit includes a plurality of diodes with respective cathodes and anodes. Each anode of the plurality of diodes is coupled to one of the plurality of ports. A bypass capacitor is coupled between the cathodes of the plurality of diodes and ground. In an embodiment, a bulk capacitor is further coupled between the cathodes of the plurality of diodes and ground.06-25-2009
20090122456Common gate connected high voltage transient blocking unit - When a series protective element such as a transient blocking unit (TBU) is used in combination with a shunt protective element such as a gas discharge tube (GDT), firing of the GDT can cause a transient having the potential to damage the TBU. This problem can be alleviated by placing a TBU core in series between depletion mode transistors having their gates connected. With this arrangement, the GDT transient causes a transient in the TBU circuit that has the effect of switching the transistors around the TBU hard off, thereby protecting the TBU from the GDT transient.05-14-2009
20090279225Current limiting surge protection device - A current-limiting surge protection device is provided. The current-limiting surge protection device includes a pair of series connected normally on MOSFET's and a pair of voltage controlled normally off switches that are disposed to monitor a voltage across the normally on MOSFET pair. Here, the voltage controlled normally off switches close according to an excess threshold voltage across the MOSFET pair and reduces a gate drive potential of the normally on MOSFET pair to limit a current through the normally on MOSFET pair.11-12-2009
20090046407CASCADE ELECTROMAGNETIC PULSE PROTECTION CIRCUIT - The present invention discloses a cascade EMP protection circuit, which comprises an LEMP protection circuit and a fast-response protection circuit, wherein a capacitive reactance varactor element is cascaded to the path of signal transmission. Thereby, the present invention can protect electronic devices against LEMP or EMP released by an electronic weapon (NEMP, HEMP, or PEMP).02-19-2009
20090046406OVERVOLTAGE DEVICE WITH ENHANCED SURGE SUPPRESSION - An overvoltage device that is formed from a MOV device that is coupled in parallel with a spark gap. This device is coupled upstream from electronic components to protect these components from damage. For example, in one embodiment, the overvoltage device is coupled to a fault circuit interrupter such as a GFCI, across the phase and neutral lines to protect components of the GFCI from an overvoltage condition. In one embodiment the overvoltage device is formed as an MOV physically coupled to a spark gap wherein the MOV and the spark gap are electrically coupled across the phase line and the neutral line in parallel.02-19-2009
20110235228APPARATUS AND METHOD FOR ELECTRONIC CIRCUIT PROTECTION - Apparatus and methods for electronic circuit protection are disclosed. In one embodiment, an actively-controlled protection circuit includes a detector, a timer, a current source and a latch. The detector is configured to generate a detection signal when the detector determines that a transient signal satisfies a first signaling condition. The timer is configured to receive the detection signal, and to generate a current control signal. The current control signal is provided to a current source, which produces a trigger current at least partly in response to the control signal. The trigger current is provided to a node of the latch, thereby enhancing the conductivity modulation of the latch and selectively controlling the activation voltage of the latch.09-29-2011
20110058299TRANSIENT VOLTAGE PROTECTION CIRCUIT AND SYSTEM INCORPORATING THE SAME - A transient voltage protection circuit that protects a load from transient voltages is disclosed. The circuit includes a series combination of a thyristor surge protection device (TSPD), a resistor and a transorb coupled for coupling in parallel with the load, and a fuse coupled between an AC input and the series combination. The TSPD and the transorb are configured to enter a transient mode upon application of a transient voltage to the circuit to shunt current from the load and provide an AC output voltage to the load less than the transient voltage without opening the fuse.03-10-2011
20090086399SNUBBER CIRCUIT - A circuit comprising a first transistor group configured to electrically isolate, at least in part, a second transistor group from an input voltage; the second transistor group configured to provide voltage protection to a third transistor group; and the third transistor group configured to switch on and off.04-02-2009
20080304200INSULATED SURGE SUPPRESSION CIRCUIT - A potted electrical circuit is enclosed within a housing and has a first and second fiberglass layer that is laid upon a top surface of the potted electrical circuit. A lid of the housing seals the electrical circuit there within and an opening formed in a side wall allows circuitry wiring to extend there from out. The first fiberglass layer is a woven layer while the second fiberglass layer is a padding-like layer. Circuitry wiring pushes through the woven first fiberglass layer before extending out through the opening in the housing. The first fiberglass layer is tucked in and around the electrical circuit and adheres to the inside of the housing by attaching to the potting material while it hardens. In a preferred embodiment, the electrical circuit in combination with the insulation material is used within a transient voltage surge suppression device.12-11-2008
20090161282Transient protection at a line interface - A protection circuit provides transient protection to a solid state circuit of a line interface for wired telecommunications media at a voltage level below the power supply of the solid state circuit and prevents transient currents from entering the power supply distribution where they might cause damage to the protected interface and other circuits. The protection circuit uses a MOSFET, the gate of which is provided with a bias derived from a power supply of the solid state circuit being protected. The bias causes the MOSFET to be always on such that the MOSFET provides an immediate and high transconductance path to ground for transient currents from the line interface.06-25-2009
20110026182SWELL SUSTAINING TRANSIENT VOLTAGE SURGE SUPPRESSOR - A transient voltage surge suppressor assembly comprising: a first energy absorbing device; a second energy absorbing device in parallel with the first device; and a voltage sense circuit configured to take the first device off-line when a voltage swell lasts for a duration. The first and second devices may be wired in parallel between a line and a neutral. The assembly may include a third energy absorbing device wired between the line and a ground, the third device also being configured to be taken off-line when the voltage swell lasts for the duration. The voltage sense circuit may be powered by a line voltage or a lower supply voltage. The first device may be more sensitive than the second device. For example, the first device may have a lower clamping voltage than the second device. The first device may be smaller and/or include fewer components than the second device.02-03-2011
20110242719CASCADE ELECTROMAGNETIC PULSE PROTECTION CIRCUIT FOR HIGH FREQUENCY APPLICATION - The present invention discloses a cascade EMP protection circuit, which comprises an LEMP protection circuit and a fast-response protection circuit, wherein a symmetric capacitive varactor element is cascaded to the path of signal transmission. Thereby, the present invention can protect electronic devices against LEMP or EMP released by an electronic weapon (NEMP, HEMP, or PEMP).10-06-2011
20100177452DC BUS CLAMP CIRCUIT TO PREVENT OVER VOLTAGE FAILURE OF ADJUSTABLE SPEED DRIVES - The present invention relates to a protective circuit to provide over voltage protection for an ASD. The protective circuit provides the benefits of fewer components with lower power ratings than existing protective circuits. The protective circuit may be incorporated directly in the ASD for continuous protection or mounted externally and connected to the ASD under operating conditions that require the circuit. This flexibility for mounting the protective circuit allows the capacitor of the protective circuit to be sized either in relation to capacitive elements on the DC bus within the ASD or according to external capacitance observed at the output of the ASD. In addition, the circuit is only operative during an overvoltage condition allowing for power ratings lower than would be required for continuous operation.07-15-2010
20120147512SURGE PROTECTION CIRCUIT IN THREE-PHASE FOUR-WIRE CIRCUIT - In a surge protection circuit in a three-phase four-wire circuit, a first three-phase three-wire surge module includes terminals respectively coupled to a first phase R, a second phase S, a third phase T, and a fifth phase E. A single-phase two-wire surge module includes terminals respectively coupled to one phase R among the first phase R, the second phase S, and the third phase T, to a fourth phase N, and to the fifth phase E. The second three-phase three-wire surge module includes terminals respectively coupled to the two phases S and T among the first phase R, the second phase S, and the third phase T, to the fourth phase N, and to the fifth phase E. The two phases S and T are not coupled to the single-phase two-wire surge module.06-14-2012
20120147511SMART GROUND BONDING METHOD FOR FACILITIES - Disclosed is a smart ground bonding method for facilities, wherein an electric wire is connected between a first facility and a second facility, a first surge protection device is connected between the first facility and the electric wire, a second surge protection device is connected between the electric wire and the second facility, and wherein ground terminals of the first and second surge protection devices are bonded to metal boxes of the first and second facilities and sides of the bonded metal boxes are connected to the ground. The present invention can form potential differences between all lines of facilities such that they correspond to an equipotential to a ground, blocking a surge current passing through the facilities and basically preventing damage due to a lightning surge.06-14-2012
20130163139VARIABLE BREAKDOWN TRANSIENT VOLTAGE SUPPRESSOR - A semiconductor die includes a substrate comprising a first layer of a first wide band gap semiconductor material having a first conductivity, a second layer of a second wide band gap semiconductor material having a second conductivity different from the first conductivity, in electrical contact with the first layer, a third layer of a third wide band gap semiconductor material having a third conductivity different from the first conductivity and second conductivity, in electrical contact with the second layer, a fourth layer of a fourth wide band gap semiconductor material having the second conductivity, in electrical contact with the third layer, and a fifth layer of a fifth wide band gap semiconductor material having the first conductivity and in electrical contact with the fourth layer, wherein the first layer, the second layer, the third layer, the fourth layer, and the fifth layer are sequentially arranged to form a structure.06-27-2013
20110255204LIMITER - According to one embodiment, a limiter includes: a first capacitor and a second capacitor serially connected which are being placed between an input terminal and an output terminal; a semiconductor device connected to a connecting point of the first capacitor and the second capacitor, and to the ground, which becomes conductive when the input terminal receives the high-frequency high-power pulse signal; a choke coil, a first end thereof connected to the connecting point of the first capacitor and the second capacitor; a high-frequency coupler connected to the input terminal; a high-frequency detecting unit connected to the high-frequency coupler to detect the high-frequency high-power pulse signal which is inputted to the input terminal; and a bias applying unit configured to apply a reverse bias voltage to a second end of the choke coil when the high-frequency high-power pulse signal is detected by the high-frequency detecting unit.10-20-2011
20120200975LOW FORWARD VOLTAGE DROP TRANSIENT VOLTAGE SUPPRESSOR AND METHOD OF FABRICATING - A low forward voltage drop transient voltage suppressor utilizes a low-reverse-voltage-rated PN diode electrically connected in parallel to a high-reverse-voltage-rated Schottky rectifier in a single integrated circuit device. The transient voltage suppressor is ideally suited to fix the problem of high forward voltage drop of PN diodes and high leakage of low reverse breakdown of Schottky rectifiers. The low-reverse-voltage PN rectifier can be fabricated through methods such as 1) double layers of epi (with higher concentration layer epi in the bottom) or 2) punch through design of PN diode by base with compression.08-09-2012
20080285199Circuit Arrangement and Method For Protecting an Integrated Semiconductor Circuit - What are proposed are a circuit arrangement and a method for protecting an integrated semiconductor circuit containing a protection circuit having a thyristor structure (SCR) and also a control circuit (TC; C11-20-2008
20080253053SYSTEMS FOR CHARGING A BATTERY IN A CLOSED LOOP CONFIGURATION - A system is provided for charging a battery with an AC adapter. The system includes a first closed loop electrical path between the battery and the AC adapter. The first closed loop electrical path includes a first monitoring circuit for monitoring at least one first parameter of the system and a control circuit for dynamically adjusting the AC adapter output to the battery in response to the at least one first parameter exceeding an associated predetermined threshold. The system includes a second closed loop electrical path between the battery and the AC adapter. The second closed loop electrical path includes a second monitoring circuit for monitoring at least one second parameter of the system and a protection circuit responsive to the at least one second parameter exceeding an associated predetermined threshold for protecting the system until the AC adapter reaches a predetermined value.10-16-2008
20120200976SURGE PROTECTION DEVICE - Disclosed is a surge protection device (08-09-2012
20120063049JUNCTION FIELD EFFECT TRANSISTOR FOR VOLTAGE PROTECTION - Apparatus and methods are disclosed, such as those involving a junction field effect transistor for voltage protection. One such apparatus includes a protection circuit including an input, an output, and a JFET. The JFET has a source electrically coupled to the input, and a drain electrically coupled to the output, wherein the JFET has a pinch-off voltage (Vp) of greater than 2 V in magnitude. The apparatus further includes an internal circuit having an input configured to receive a signal from the output of the protection circuit. The protection circuit provides protection over the internal circuit from overvoltage and/or undervoltage conditions while having a reduced size compared to a JFET having a Vp of smaller than 2 V in magnitude.03-15-2012
20110080682ELECTRICAL PROTECTION ASSEMBLY AND SYSTEM - An electrical protection assembly for connection between an electrical power supply line and electrical equipment has an insulating mounting structure; a first arm connectable to a live conductor for connection to a fusible device at a first end and a voltage surge protection unit at a second end, pivotally attached to the mounting structure in a displaceable manner intermediate its ends; a first connection arrangement at the first end of the first arm for connection to the fusible device; and a second connection arrangement at the second end of the first arm for connection to the voltage surge protection unit. The assembly further includes first and second springs for urging the first arm relative to the mounting structure. The springs may urge the second connection arrangement towards the voltage surge protection unit and the first connection arrangement away from the fusible device.04-07-2011
20100246085HIGH-VOLTAGE DEVICE - A high-voltage device includes a conducting element for conducting a high-voltage current and at least one transient reducing unit for reducing voltage peaks of existing propagating very fast transients (VFTs) by the generation of arcing. The transient reducing unit has at least one arcing occurrence surface. The at least one arcing occurrence surface of the at least one transient reducing unit is positioned in the vicinity of the conducting element such that arcing occurs between the transient reducing unit and the conducting element when the potential difference between the transient reducing unit and the transient conducting element is above a threshold value, such as at the occurrence of a very fast transient. A method is also provided for equipping a high-voltage device with the transient reducing unit.09-30-2010
20090316322Meter Having Load Control Unit - A load control unit is provided for a meter which can be connected to a meter communication network. The load control unit includes a dual coil solenoid switch that is operable to connect the meter to a load, and disconnect the meter from the load. An electronic switching circuit is provided that reduces or eliminates undesirable braking in the solenoid switch.12-24-2009
20110051305Series Current Limiter Device - Semiconductor protection devices, and related methods and systems, especially devices for providing series current limiting. The device typically comprises two regenerative building blocks and/or MOSFETs connected back-to-back in series, where one of the MOSFETs/Regenerative Building Blocks has an extra voltage probe electrode that provides a regenerative signal with self-limited voltage to the other via coupling to its gate electrode.03-03-2011
20110116199Power Dampener for a Fault Current Limiter - A method of dampening a transient in a DC biasing coil in a fault current limiter, the method including the step of: interconnecting a transient suppression circuit across the DC biasing coil, the transient suppression circuit being operative when the transient voltage across the DC biasing coil exceeds a predetermined maximum.05-19-2011
20120039009INTEGRATED PROTECTION CIRCUIT - An integrated protection circuit for protecting a main circuit from spurious high amplitude voltage signals is provided, wherein the main circuit has a main circuit input terminal connected to an input line, and the protection circuit comprises a transistor, a resistor and a capacitor. The transistor has a first electrode connected to the input line, a second electrode connected to a common reference, and a control electrode connected to the resistor. The resistor is connected to the common reference; and the capacitor is implemented as a fringe capacitor between the input line and the control electrode or a conductive line connected to the control electrode.02-16-2012
20130293997RIGID FLEX ELECTROMAGNETIC PULSE PROTECTION DEVICE - An EMP/HEMP protection device for protecting equipment from electromagnetic pulses. The protection device includes a housing defining a cavity therein and separated into two chambers, a dirty chamber for propagation of signals before filtering of electromagnetic interference, and a clean chamber, isolated from the dirty chamber, for propagation of signals after filtering. A rigid-flex printed circuit board (PCB) is disposed in the cavity for facilitating electrical connections between the chambers. Surface mount electrical components for EMP/HEMP protection are coupled with the rigid-flex PCB. Power and/or data signals are transferred from the dirty chamber to the clean chamber though a wave guide below cutoff (WBC). The WBC is formed from opposing electrical ground planes within a center PCB of the rigid-flex PCB. An electrically conductive and weather sealing gasket is disposed in the cavity of the housing for further EMI isolation.11-07-2013
20120002337APPARATUS AND METHOD FOR ELECTRONIC CIRCUIT PROTECTION - Apparatuses and methods for providing transient electrical event protection are disclosed. In one embodiment, an apparatus comprises a detection and timing circuit, a current amplification circuit, and a clamping circuit. The detection and timing circuit is configured to detect a presence or absence of a transient electrical event at a first node, and to generate a first current for a first duration upon detection of the transient electrical event. The current amplification circuit is configured to receive the first current from the detection and timing circuit and to amplify the first current to generate a second current. The clamping circuit is electrically connected between the first node and a second node and receives the second current for activation. The clamping circuit is configured to activate a low impedance path between the first and second nodes in response to the second current, and to otherwise deactivate the low impedance path.01-05-2012
20130222961APPARATUS AND METHOD FOR ELECTRONIC CIRCUIT PROTECTION - Apparatuses and methods for providing transient electrical event protection are disclosed. In one embodiment, an apparatus comprises a detection and timing circuit, a current amplification circuit, and a clamping circuit. The detection and timing circuit is configured to detect a presence or absence of a transient electrical event at a first node, and to generate a first current for a first duration upon detection of the transient electrical event. The current amplification circuit is configured to receive the first current from the detection and timing circuit and to amplify the first current to generate a second current. The clamping circuit is electrically connected between the first node and a second node and receives the second current for activation. The clamping circuit is configured to activate a low impedance path between the first and second nodes in response to the second current, and to otherwise deactivate the low impedance path.08-29-2013
20120014027TRANSIENT VOLTAGE SUPPRESSOR FOR MULTIPLE PIN ASSIGNMENTS - A transient voltage suppressor (TVS) for multiple pin assignments is disclosed. The suppressor comprises at least two cascade-diode circuits in parallel to each other and an electrostatic-discharge clamp element in parallel to each cascade-diode circuit and connected with a low voltage. One cascade-diode circuit is connected with a high voltage, and the other cascade-diode circuits are respectively connected with I/O pins. Each cascade-diode circuit further comprises a first diode and a second diode cascaded to the first diode, wherein a node between the first diode and the second diode is connected with the high voltage or the one I/O pin. The design of the present invention can meet several bounding requirements. It is flexible different pin assignments of TVS parts.01-19-2012
20110181993SWITCHING DEVICE - A switching device includes a plurality of semiconductor switching elements coupled in series, a smoothing capacitor, and snubber circuit. Each of the semiconductor switching elements includes a free wheel diode. The smoothing capacitor is coupled in parallel with a direct current power source and the semiconductor switching elements. The smoothing capacitor smoothes an output of the direct current power source and supplies the smoothed output to the semiconductor switching elements. The snubber circuit is coupled between a first connecting point and a second connecting point in parallel with the semiconductor switching elements. An inductance of a first channel provided from the first connecting point to the second connecting point through the smoothing capacitor is equal to or more than 10 times as large as an inductance of a second channel including the semiconductor switching elements and the snubber circuit.07-28-2011
20120176718TRANSIENT VOLTAGE SUPPRESSOR - A transient voltage suppressor may include a silicon controlled rectifier (SCR) having an anode coupled to Vcc. The SCR may include a PNP transistor (Q07-12-2012
20120176716VERTICAL MOUNT TRANSIENT VOLTAGE SUPPRESSOR ARRAY - A system comprises a package with top and bottom surfaces, a plurality of high-power transient voltage suppressors arranged within the package, and a robust lead frame. Each of the transient voltage suppressors has first and second major surfaces substantially perpendicular to the top and bottom surfaces of the package. The lead frame comprises leads connected to the major surfaces of the transient voltage suppressors. Each of the leads has a thickness greater than about 0.015 inches (or 0.381 mm) in a mounting portion, in order to dissipate heat from the transient voltage suppressors and to resist vibration-induced stress on the package.07-12-2012
20100033889ELECTRICAL GROUND TRANSIENT ELIMINATOR ASSEMBLY - An electrical ground transient eliminator assembly for attenuating high frequency transients and protecting a continuous attenuator circuit of the assembly from overheating due to excessive transients generated on an electrical load is provided. The electrical ground transient eliminator assembly includes a continuous attenuator circuit, which is electrically coupled in parallel to a relay. The assembly includes three lead wires, which are interconnectable to an earth ground line, a neutral line and a load ground of a system that has an electrical load coupled to external AC power lines.02-11-2010
20120281329TRANSIENT VOLTAGE SUPPRESSOR (TVS) WITH IMPROVED CLAMPING VOLTAGE - This invention discloses an electronic device formed as an integrated circuit (IC) wherein the electronic device further includes a transient voltage suppressing (TVS) circuit for suppressing a transient voltage. The transient voltage suppressing (TVS) circuit includes a Zener diode connected between a ground terminal and a node for triggering a snapback circuit. In one embodiment, this node may be a Vcc terminal. The TVS device further includes a snapback circuit connected in parallel to the Zener diode for conducting a transient voltage current with a snapback current-voltage (I-V) characteristic upon turning on of the snapback circuit. And, the TVS device further includes a snapback suppressing circuit connected in series with the snapback circuit for conducting a current with an I-V characteristic complementary to the snapback-IV characteristic for clamping a snapback voltage.11-08-2012
20120320483APPARATUS AND METHOD FOR ELECTRONIC CIRCUIT PROTECTION - Apparatus and methods for electronic circuit protection are disclosed. In one embodiment, an actively-controlled protection circuit includes a detector, a timer, a current source and a latch. The detector is configured to generate a detection signal when the detector determines that a transient signal satisfies a first signaling condition. The timer is configured to receive the detection signal, and to generate a current control signal. The current control signal is provided to a current source, which produces a trigger current at least partly in response to the control signal. The trigger current is provided to a node of the latch, thereby enhancing the conductivity modulation of the latch and selectively controlling the activation voltage of the latch.12-20-2012
20110038087DISCHARGE PROTECTION APPARATUS AND METHOD OF PROTECTING AN ELECTRONIC DEVICE - A protection circuit apparatus comprises an electrostatic discharge circuit coupled to an isolation filter. The isolation filter comprises an inductor coupled to a ground-coupled capacitor, the inductor and the capacitor being coupled to the electrostatic discharge circuit. The inductor is also coupled to an electrostatic discharge sensitive device to be protected from an electrostatic discharge event.02-17-2011
20130021709CONDUCTOR ARRANGEMENT FOR REDUCING IMPACT OF VERY FAST TRANSIENTS - A conductor arrangement is provided for reducing very fast transients in high voltage applications. The conductor arrangement includes a conductor element having a main conducting orientation, and a conductive annular shell element coaxial to the conductor element, thus forming an annular cavity around the conductor element. The annular shell element in the main conducting orientation includes a first end portion and a second end portion. The first end portion is conductively connected to the conductor element. The second end portion includes an annular collar which is substantially coaxial to the conductor element, thus together with the conductor element forming a coaxial capacitor which has a solid material filling. The capacitor includes a surge arrester which may serve as an energy conversion portion.01-24-2013
20100014205MULTIPLE OPERATING VOLTAGE ELECTRICAL SURGE PROTECTION APPARATUS - A component of an electrical system capable of operation at any of two or more different nominal normal operating voltages is protected from a transient overvoltage condition by an apparatus having at least one phase-to-ground array of surge protection devices (SPDs) connected in series with one another to define a series of tap points on opposite sides of the SPDs and having at least two sets of electrical conductors for coupling the electrical system to a user-selectable one of the tap points which corresponds to a desired one of the nominal operating voltages. An array of capacitors connected electrically in series with one another is connected between each of the tap points and a monitoring circuit to provide impedance for dropping each nominal operating voltage to a suitable voltage for powering the monitoring circuit with low energy loss.01-21-2010
20130258541METHOD AND SYSTEM FOR LIGHTNING PROTECTION WITH DISTRIBUTED TRANSIENT VOLTAGE SUPPRESSION - A method of method of forming a wide band-gap semiconductor transient voltage suppressor (TVS) assembly and a system for a transient voltage suppressor (TVS) assembly are provided. The TVS assembly includes a connecting component configured to electrically couple a first electrical component to a second electrical component located remotely from the first electrical component through one or more electrical conduits and a transient voltage suppressor device positioned within the connecting component and electrically coupled to the one or more electrical conduits wherein the TVS device includes a wide band-gap semiconductor material.10-03-2013
20080247111Arrangement for Energy Conditioning - Circuit arrangement embodiments that use relative groupings of energy pathways that include shielding circuit arrangements that can sustain and condition electrically complementary energy confluences.10-09-2008
20080232019Decoupling capacitor control circuit and method for enhanced ESD performance - A decoupling capacitor control circuit is configured to be coupled between supply voltage and reference voltage planes. The control circuit includes a decoupling capacitor having a first node configured to be coupled to the supply voltage plane and having a second node. A first switching element has a first signal node coupled to the second node of the decoupling capacitor and has a second signal node and a control node. A second switching element has a first signal node coupled to the first node of the decoupling capacitor and has a second signal node coupled to the control node of the first switching element, and has a control node. A biasing circuit is coupled to the control nodes of the first and second switching elements. The biasing circuit activates both switching elements when the decoupling capacitor is not defective and deactivates both switching elements when the decoupling capacitor is defective.09-25-2008
20090310272ENERGY SAVINGS AND SURGE PROTECTION DEVICE - An energy savings and surge protection devices device that saves electrical energy by optimizing the power factor in single-phase and three-phase applications through the use of capacitors (12-17-2009
20100315754TRANSIENT VOLTAGE DETECTION CIRCUIT - The invention discloses a transient voltage detection circuit suitable for an electronic system. The electronic system includes a high voltage line and a low voltage line. The transient voltage detection circuit includes at least one detection circuit and a judge module. Each detection circuit includes a P-typed transistor and/or an N-typed transistor, a capacitor and a detection node. The transistor is coupled with the capacitor, and the detection node is located between the transistor and the capacitor. The judge module is coupled to each of the detection nodes. The judge module generates a judgment according to voltage levels of the detection nodes. Accordingly, the transient voltage detection circuit is formed. The electronic system may selectively execute a protective action according to the judgment.12-16-2010
20130182362Protecting Unit Having a Function of Thermal Energy Guiding - A protecting unit having a function of thermal energy guiding comprises a body electrically connected to a first lead-out electrode and a second lead-out electrode; the body being wrapped in a packing material; a thermal energy guider disposed on the body adopting a continuous leading wire; one end of the leading wire being disposed on the first lead-out electrode, and the other end thereof being outward extended from the packing material. Thereby, the thermal energy guider utilizes thermal conduction to guide thermal energy in/out of the body so as to prevent electronic appliances from overloading and avert danger.07-18-2013
20110304944APPARATUS AND METHOD FOR ELECTRONIC SYSTEMS RELIABILITY - Apparatuses and methods for protecting electronic circuits are disclosed. In one embodiment, an apparatus for providing protection from transient signals comprises an integrated circuit, a pad on a surface of the integrated circuit, and a configurable protection circuit within the integrated circuit. The configurable protection circuit is electrically connected to the pad. The configurable protection circuit comprises a plurality of subcircuits arranged in a cascade, and selection of one or more of the plurality of the subcircuits for operation determines at least one of a holding voltage or a trigger voltage of the configurable protection circuit.12-15-2011
20130010396Voltage Transient Protection Circuitry - Disclosed are advances in the arts with novel and useful voltage transient protection circuitry in configurations which include a bridge circuit in combination with one or more voltage reference, load to ground circuit, and/or snub circuit such that the output node is held at a selected voltage level, preferably mid-rail, and potentially damaging transient voltages are avoided.01-10-2013
20120287547SNUBBER CIRCUIT - A circuit comprising a first transistor group configured to electrically isolate, at least in part, a second transistor group from an input voltage; the second transistor group configured to provide voltage protection to a third transistor group; and the third transistor group configured to switch on and off.11-15-2012
20130242449SEMICONDUCTOR DEVICE - A semiconductor device for protecting loads from power surges includes a first resistor having a first end connected to a first supply terminal, a capacitor connected to a second end of the first resistor and a second supply terminal. There is a first transistor with a source connected to the first supply terminal and a gate connected to a point between the first resistor and the capacitor. A second resistor is connected between the drain of the first transistor and the second supply terminal, and a first diode is connected between the gate and the source of the first transistor. A second transistor has a drain connected to the first supply terminal, a source connected to the second supply terminal, and a gate connected to the drain of the first transistor. There is a second diode connected between the gate and the source of the second transistor.09-19-2013
20130242448APPARATUS AND METHOD FOR PROTECTION OF PRECISION MIXED-SIGNAL ELECTRONIC CIRCUITS - Apparatus and methods for precision mixed-signal electronic circuit protection are provided. In one embodiment, an apparatus includes a p-well, an n-well, a poly-active diode structure, a p-type active region, and an n-type active region. The poly-active diode structure is formed over the n-well, the p-type active region is formed in the n-well on a first side of the poly-active diode structure, and the n-type active region is formed along a boundary of the p-well and the n-well on a second side of the poly-active diode structure. During a transient electrical event the apparatus is configured to provide conduction paths through and underneath the poly-active diode structure to facilitate injection of carriers in the n-type active region. The protection device can further include another poly-active diode structure formed over the p-well to further enhance carrier injection into the n-type active region.09-19-2013
20100020458CHIP-TYPE PROTECTION DEVICE HAVING ENCLOSED MICRO-GAP BETWEEN ELECTRODES - The present invention relates to a chip-type protection device having an enclosed micro-gap between electrodes. The invention includes a substrate on which a pair of discharge electrodes extend towards each other by a micro-gap. A wall is disposed in a manner spaced apart from the micro-gaps by a predetermined distance, on which a cover portion is mounted in a straddling manner across the micro-gaps. The wall and the cover portion are integrated under a predetermined gaseous environment to form a hermectic chamber on which an outer protective layer is coated. End electrodes are subsequently formed on the substrate in a manner connected to conductive portions of the discharge electrodes. The invention provides a protection device against over-voltage.01-28-2010
20130208385PROTECTION SYSTEMS FOR INTEGRATED CIRCUITS AND METHODS OF FORMING THE SAME - Harsh electrical environments integrated circuit protection for system-level robustness and methods of forming the same are provided. In one embodiment, a protection system includes dual-polarity high blocking voltage primary and secondary protection devices each electrically connected to a pad. The primary protection device has a current handling capability greater than a current handling capability of the secondary protection devices, and the secondary protection device has a turn-on speed that is faster than a turn-on speed of the primary protection device so as to decrease pad voltage overshoot when a fast transient electrical event occurs on the pad. Additionally, the holding voltage of the primary protection device is less than a holding voltage of the secondary protection device such that once the primary protection device has been activated the primary protection device clamps the pad voltage so as to minimize a flow of high current through the secondary protection device.08-15-2013
20130271890COMPACT TRANSIENT VOLTAGE SURGE SUPPRESSION DEVICE - A transient voltage surge suppression device includes a varistor assembly having a compact thickness, and a disconnect element carrying a separable contact along a linear axis to disconnect the varistor element from external circuitry.10-17-2013
20090323245Device for Reduction of Voltage Derivative - A device for reduction of the voltage derivative for an electrical component connected to an electric conductor via an electric bushing. The device protects an electrical component in an electrical apparatus against high voltage derivatives.12-31-2009

Patent applications in class Transient responsive