Class / Patent application number | Description | Number of patent applications / Date published |
361033000 | Voltage | 23 |
20080218917 | METHODS AND SYSTEMS FOR OPERATING DIRECT CURRENT MOTORS - A method for applying power to an electronically commutated motor (ECM) is described. The method includes connecting an AC voltage source to an input of a rectification circuit, connecting a DC voltage source to an output of the rectification circuit, and electrically connecting the DC voltage source and rectification circuit output to operational components of the ECM. The DC voltage source is capable of providing a voltage equal to or greater than a rectified voltage originating from the AC voltage source, and the DC voltage source is connected in parallel with the output of the rectification circuit. | 09-11-2008 |
20080291589 | Motor drive apparatus and motor drive control method - A protection circuit is configured to change control modes in a drive control process of a drive circuit for a motor when overvoltage is applied to a power source line while the motor is driven. With overvoltage applied, the control process is changed to a control mode to perform forced commutation control. When a predetermined time period passes after the voltage of the power source line returns to a predetermined level, the control process is changed to a sensorless control mode using a position detection circuit. This configuration can provide a motor drive apparatus capable of performing an overvoltage protection operation appropriately even when the sensorless control mode is adopted. | 11-27-2008 |
20080297959 | Motor Driving Circuit - A motor driving circuit comprising: a synchronous rectification driving circuit to carry out synchronous rectification, to energize a driving coil connected between a first connection point at which a first source and first sink side transistors are connected in series and a second connection point at which a second source and second sink side transistors are connected in series; a backflow detecting resistor connected to electrodes of the first and second sink side transistors, the electrodes being on an opposite side of the first and second sink side transistors to the first and second connection points; a backflow detecting comparator to output a comparison signal indicating a result of comparison of voltage between a first and second terminals of the backflow detecting resistor, and a backflow prevention circuit to prohibit the synchronous rectification when the comparison signal indicates that the second terminal is higher in voltage than the first terminal. | 12-04-2008 |
20080304189 | PROTECTION FOR PERMANENT MAGNET MOTOR CONTROL CIRCUITS - Methods and apparatus are provided for protecting a motor control circuit in a permanent magnet electric motor system. The permanent magnet electric motor system includes a permanent magnet electric motor having a predetermined number of windings corresponding to the phases of the permanent magnet electric motor and a direct current (DC) bus coupled to a power source for providing operational power for the electric motor system. A motor control circuit is connected to the DC bus for receiving the operational power therefrom and is connected to the windings of the permanent magnet electric motor for controlling the permanent magnet electric motor. A protection circuit is connected to the DC bus for receiving the voltage therefrom for operation of the protection circuit and for detecting predetermined motor control circuit fault conditions from voltage sensed on the DC bus and in response thereto providing protection for the motor control circuit. | 12-11-2008 |
20090168276 | Protection of Polarity-Sensitive Components Connected In Parallel With A Direct Current Motor Or Inductor - Circuits and methods for protecting polarity-sensitive components, such as light emitting diodes, electrolytic capacitors or integrated circuits, operating from a DC current source including a DC motor, an inductor or relay having a positive terminal and a negative terminal for receiving current from the current source, a protection diode connected parallel with the positive and negative terminals of the motor in a reverse bias configuration, at least one polarity-sensitive component connected in parallel with the protection diode and the DC motor, and a polarity protection transistor connected either between the nominally positive current source terminal and the positive motor terminal, or between the nominally negative current source terminal and the negative motor terminal. | 07-02-2009 |
20100014196 | Load driving circuit - Detection accuracy of a short circuit state in a load driving circuit is improved thereby operation efficiency of a motor may be enhanced. A gate control circuit | 01-21-2010 |
20110058288 | PROTECTIVE REDUNDANT SUBSYSTEM FOR POWER TOOLS - A protective redundancy circuit is provided for a power tool having an electric motor. The protective redundant subsystem is comprised of: a motor switch coupled in series with the motor; a motor control module that controls the switching operation of the motor switch; and a protective control module that monitors switching operation of the motor switch and disables the power tool when the switching operation of the motor switch fails. In the context of an AC powered tool, the switching operation of the motor switch is correlated to and synchronized to the waveform of the AC input signal. During each cycle or half cycle, the motor control module introduces a delay period before closing the motor switch and the protective control module determines the operational status of the motor switch by measuring the voltage across the motor switch during the delay period. | 03-10-2011 |
20110110002 | ELECTRIC POWER SUPPLY DEVICE - An electric power supply device capable of miniaturizing an FET and wiring and reducing the amount of heat generation even when a motor load goes into a lock state is provided. It is determined whether or not a lock current flows in a motor M | 05-12-2011 |
20110188158 | PROTECTION CIRCUIT FOR A DRIVE CIRCUIT OF A PERMANENT MAGNET MOTOR AND CORRESPONDING SYSTEM - It is presented a protection circuit for a drive circuit of a permanent magnet motor being powered by a main DC source. The protection circuit comprises a protection circuit DC source; a changeover switch being arranged to select an input to a gate of a main drive switch of the drive circuit, the input being selectable between an output of the protection circuit DC source and a second control signal; and a changeover control device connected to control the changeover switch, which changeover control device is arranged to ensure that the changeover switch is connected to the output of the second side of the protection circuit DC source when an overvoltage is detected. | 08-04-2011 |
20130107401 | Time Delay With Control Voltage Sensing | 05-02-2013 |
20130128394 | Circuit Assembly for Overvoltage Limiting of An Excitation Coil of A Syncronous Machine Having Fast De-Excitation - A circuit arrangement for de-exciting an excitation winding of a synchronous machine in the event of a fault, including a control circuit for controlling a current flow through the excitation winding, it being possible to apply a positive control voltage to the excitation winding for excitation and a negative control voltage for rapid de-excitation, and including a protective circuit which is parallel-connected to the excitation winding and which does not permit a current flow over the protective circuit in the event of rapid de-excitation and which forms a current path for limiting the voltage and de-exciting the excitation winding if at least one connecting line between the control circuit and the excitation winding is interrupted. | 05-23-2013 |
20130271881 | PROTECTIVE CIRCUIT IN A WINDSCREEN WIPER DRIVE AND WINDSCREEN WIPER DRIVE - The invention relates to a protective circuit ( | 10-17-2013 |
20140022676 | CIRCUIT WITH MOTOR DRIVER SPIKE SUPPRESSION - A suppression circuit may be added to a motor driver circuit, which suppresses offset voltage and ringing in the output signal. The suppression circuit may include an RC circuit filter connected to a pin of a microchip providing a gating reference signal and a junction between high and low side MOSFETS connected to the microchip. | 01-23-2014 |
20140111890 | BI-DIRECTIONAL BIPOLAR JUNCTION TRANSISTOR FOR HIGH VOLTAGE ELECTROSTATIC DISCHARGE PROTECTION - A bi-directional electrostatic discharge (ESD) protection device may include a substrate, an N+ doped buried layer, an N-type well region and two P-type well regions. The N+ doped buried layer may be disposed proximate to the substrate. The N-type well region may encompass the two P-type well regions such that a portion of the N-type well region is interposed between the two P-type well regions. The P-type well regions may be disposed proximate to the N+ doped buried layer and comprise one or more N+ doped plates and one or more P+ doped plates. | 04-24-2014 |
20140118867 | DRIVE CIRCUITS AND SYSTEMS FOR MOTOR CONTROLLER PROTECTION - Protection of a motor controller from a transient voltage and/or an over-voltage condition is described. A drive circuit includes a rectifier portion and at least one inductive device coupled to the rectifier portion. The drive circuit further includes at least one voltage clamping device coupled in parallel with the at least one inductive device, and at least one switching device configured to open as a function of a direct current (DC) link voltage value. | 05-01-2014 |
20140218828 | POWER PROTECTION APPARATUS AND METHOD - A power-protection apparatus is provided. The apparatus includes an over-voltage protection unit for generating an over-voltage detection signal when the power supply of the load is over the upper limit of a predetermined voltage range; an under-voltage protection unit for generating an under-voltage detection signal when the power supply of the load is under the lower limit of the predetermined voltage range; a working-state detection unit for receiving a control signal and generating a working-state detection signal when the level time-change rate of the control signal is over a time-change rate threshold; and a power-control unit coupled to the over-voltage protection unit, the working-state detection unit and the under-voltage protection unit for controlling the on and off of the power supply according to the over-voltage detection signal, the under-voltage detection signal or the working-state detection | 08-07-2014 |
20140247524 | Three-Phase Detection Module - A method includes receiving N power signals, each having a different one of N phases, over N power supply lines, where N is an integer greater than two. The method further includes selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines. The method includes generating a signal based on the first current, and selectively generating a phase failure signal when the signal is less than a predetermined threshold. | 09-04-2014 |
20140268433 | SYSTEM AND METHOD FOR PROTECTION OF A COMPRESSOR WITH AN ALUMINUM WINDING MOTOR - A compressor is provided and includes a single-phase electric motor and a protector device. The electric motor drives a compression mechanism and has a rotor and a stator. The stator is comprised of aluminum windings. The protector device is attached to the stator and is configured to disconnect the electric motor from a power supply when an input voltage of the power supply to the electric motor is less than a threshold voltage value set at a level between a minimum run voltage and an overheat voltage of the compressor. The overheat voltage corresponds to an overheat temperature of the electric motor. The threshold voltage value is set at a level that is between the minimum run voltage and the overheat voltage. The protector device includes a tolerance level such that the threshold voltage minus the tolerance level is greater than the overheat voltage and the threshold voltage plus the tolerance level is less than the minimum run voltage. | 09-18-2014 |
20150085403 | SOFT SHUTDOWN FOR ISOLATED DRIVERS - An apparatus for controlling a high-power drive device external to a package of a motor drive circuit includes a motor drive circuit. The motor drive circuit includes a driver to control the high-power drive device based on a first reference voltage, a second reference voltage, and a control signal based on a received control signal. A fault circuit generates a failure indicator based on a voltage across terminals of the high-power drive device. A fault condition is based on the failure indicator. A first terminal coupled to the driver charges a node of the high-power drive device over a first length of time in response to an absence of the fault condition and a first level of the control signal. A second terminal coupled to the driver discharges the node over a second length of time different from the first length of time. | 03-26-2015 |
20150311695 | VARIABLE FREQUENCY DRIVE OVERVOLTAGE PROTECTION - Overvoltage protection apparatuses, systems and methods for variable frequency motor drives are disclosed. In an exemplary embodiment, a variable frequency motor drive system including a rectifier, a DC bus electrically coupled with the rectifier, and an inverter electrically coupled with the DC bus is provided. A protection device electrically coupled with the rectifier and configured to interrupt power supply to the system based upon fault conditions is provided. A controller is provided and configured to receive information indicative of a voltage of the DC bus, process the received information to model a condition of at least one component of the variable frequency motor drive, and control the protection device to interrupt power supply to the variable frequency motor drive if the modeled condition meets a fault criterion. | 10-29-2015 |
20150333510 | ELECTROSTATIC DISCHARGE PROTECTION SYSTEM FOR WINDOW COVERINGS - An electrostatic discharge (ESD) circuit for use with motorized window shades includes an antenna connected to a motor controller having a printed circuit board, a receiver or transceiver, a microprocessor and memory that are connected to and operate a motor. The ESD circuit is connected to the line-in between the antenna and the downstream components of the printed circuit board. The ESD circuit includes an inductor in parallel with two anti-parallel diodes in reverse polarity to one another. The ESD circuit shunts damaging signals or ESD events to ground by providing a lower impedance or lower resistance path to ground for these signals, whereas the ESD circuit allows the signals of interest to pass by the ESD circuit as the ESD circuit provides a higher impedance or higher resistance path to ground as compared to the signal of interest passing through the receiver or transceiver of the motor controller. | 11-19-2015 |
20160043538 | ELECTROSTATIC DISCHARGE PROTECTION CIRCUIT, ELECTROSTATIC DISCHARGE PROTECTION METHOD AND VOLTAGE REGULATOR CHIP HAVING THE SAME - An electrostatic discharge (ESD) protection circuit, an ESD protection method, and a voltage regulator chip having the same are provided. The ESD protection circuit includes a turn-on voltage controller, an ESD protection switch and a control signal transporting path. The turn-on voltage controller is coupled to a pad, and generates a detection signal according to a voltage on the pad. The ESD protection switch is turned on according to a control signal for discharging an ESD current on the pad. The control signal transporting path is turned on according to the detection signal and generates the control signal by delaying the voltage on the pad according to a delay value. | 02-11-2016 |
20160197602 | METHOD FOR PROTECTING A CONTROLLABLE SEMICONDUCTOR SWITCH FROM OVERLOAD AND SHORT-CIRCUITING IN A LOAD CIRCUIT | 07-07-2016 |