Class / Patent application number | Description | Number of patent applications / Date published |
361031000 | Current | 43 |
20080278870 | OVER CURRENT DETECTION CIRCUITS FOR MOTOR DRIVER - A motor driver having over current detection circuitry includes an H-bridge having a first differential input, a second differential input, and a differential output; a sensing circuit coupled to the differential output of the H-bridge; a comparison and logic circuit coupled to the sensing circuit; a pair of pre-driver circuits coupled to the comparison and logic circuit for driving at least one of the differential inputs of the H-bridge; and a pair of level shifters coupled between the comparison and logic circuit and the sensing circuit. The H-bridge includes a first side having a first transistor coupled to a second transistor, and a second side having a third transistor coupled to a fourth transistor. The first and third transistors are power PDMOS transistors, and the second and fourth transistors are power NDMOS transistors. The pair of level shifters are used to assure that the V | 11-13-2008 |
20080297958 | MOTOR CONTROLLER AND ELECTRIC POWER STEERING APPARATUS - When a failure of an electric current flow occurs in any one of phases, a microcomputer calculates a d-axis current command value that changes along a tangent curve with predetermined rotation angles as asymptotic lines. The microcomputer continuously outputs a motor control signal using two phases other than the phase with the failed electric current as electric current flowing phases by performing current feedback control in correspondence with the d-axis current command value. In such two-phase drive operation, the microcomputer calculates the d-axis current command value and a q-axis current command value in such a manner that the phase current values of the electric current flowing phases become constant at respective maximum values of flowable electric currents, which are set for the phases, in rotation angle restriction ranges in which the phase current values need to be restricted in correspondence with the maximum values, or electric current restriction ranges. | 12-04-2008 |
20080310057 | MEMS BASED MOTOR STARTER WITH MOTOR FAILURE DETECTION - A motor starter is disclosed. The motor starter includes control circuitry integrally arranged with at least one current path and a processor included in the control circuitry. The motor starter further includes at least one processor algorithm residing on the processor, the at least one processor algorithm containing instructions to monitor characteristics of current on the at least one current path and to provide data pertaining to a condition of the at least one current path. The motor starter further includes a micro electromechanical system (MEMS) switch disposed on the at least one current path, the MEMS switch responsive to the control circuitry to facilitate the control of an electrical current, passing through the at least one current path. | 12-18-2008 |
20090027814 | ELECTRONIC TRIPPING UNIT FOR A MOTOR-CIRCUIT BREAKER OF AN ELECTRIC MOTOR - An electronic trip unit for a motor circuit breaker of an electric motor includes at least one detection unit configured to sense at least one current that is delivered to the electric motor. The unit further including a discriminator circuit, the discriminator circuit being in a first state when no measured current value exceeds a predefined trip threshold, and being in a second state when at least one measured current value exceeds the predefined trip threshold. The discriminator circuit includes an output for controlling the motor; a voltage-limiting component having a breakdown voltage; a resistor; and a switching unit configured to, in the first state, switch the control signal to the first level, and, in the second state, switch the control signal to the second level, the switching unit being configured to be switched by a voltage drop across the resistor. | 01-29-2009 |
20090059445 | Overload Current Control Circuit for a DC Motor - An overload current control circuit for a DC motor comprises: a DC motor, a DC power source, a power semiconductor assembly, and a sampling resistor that are connected in series. The overload current control circuit further comprises a voltage polarity switching circuit that is connected to a circuit between the sampling resistor and the overload protection and detection circuit to control the single polarity of the sampling voltage of the first and second terminals of the sampling resistor, so as to provide constant voltage potential to the overload protection and detection circuit, thus providing overload protection to the DC motor. | 03-05-2009 |
20090059446 | AC Motor Controller - There is provided an AC motor controller capable of detecting an abnormal state of a motor cable while an AC motor is operating without using a special circuit but using a processor. | 03-05-2009 |
20090279215 | Protecting device for multi-motors and method thereof - A protecting device for multi-motors driven by motor driving circuits for operating motors includes a comparison module, an operative logic module and a control module. The comparison module determines whether or not an abnormal over current occurs in the motors. The operative logic module receives a determination result of the comparison module and outputting a motor control signal to the motor driving circuit and a notice signal to the control module. If an over current occurs in the motor, the motor control signal outputted from the operative logic module will be a disable signal for stopping the operation of the motor driving circuit and the motor. The control module outputs a warning signal based on the notice signal to notify users about the operating status of the motor. Therefore, the present invention can prevent the motor driving circuit and the motor from being damaged by an over current. | 11-12-2009 |
20090284877 | Integrated Overload and Low Voltage Interrupt Module - A power management module for a winch system comprises an overload and low voltage interrupt module within a housing. The overload interrupt determines operating current for the winch system and provides an interrupt signal when the current is greater than a threshold. The low voltage interrupt determines voltage of a power source and provides an interrupt signal when the voltage is less than a threshold. A method of operating the power management module comprises determining operating current of the winch system with an overload interrupt module and voltage of a vehicle power source with a low voltage interrupt module. The overload and low voltage interrupt modules are located within a housing. The overload interrupt provides an interrupt signal when the operating current is greater than a threshold. The low voltage interrupt provides an interrupt signal when the voltage is less than a threshold. | 11-19-2009 |
20100002342 | Stand-Alone Pump Shut-Off Controller - Embodiments of the invention provide a stand-alone controller and a method for controlling a pump motor driven by an alternating current source. The stand-alone controller includes a power terminal for connection with the alternating current source and a load terminal for connection with the pump motor. The stand-alone controller further includes an enable switch to form a power line carrying power from the alternating current source to the pump motor. The stand-alone controller can store a first current being drawn through the power line by the pump motor when a control switch is actuated. A state of the enable switch is based on a comparison of the first current to a second current being drawn through the power line by the pump motor. | 01-07-2010 |
20100027170 | ELECTRIC VEHICLE - An electric vehicle includes a control unit having overcurrent generation judgment unit, inverter selection unit, and inverter drive control unit. The overcurrent generation judgment unit judges whether an overcurrent is generated in an inverter for generation or an inverter for travel. When an overcurrent is generated in one of the inverters, the inverter selection unit selects the other inverter to be driven. The inverter drive control unit stops the driving of the one inverter and drives the other inverter to drive a travel motor or a generator. | 02-04-2010 |
20100097732 | Method and apparatus for limiting torque in an electric drive motor | 04-22-2010 |
20100149699 | MOTOR DETECTING AND PROTECTING APPARATUS AND ITS METHOD - A motor detecting and protecting apparatus electrically connected with a motor. The motor detecting and protecting apparatus includes a detecting unit, an error determining unit, a controlling unit and a driving unit. The detecting unit detects a state of the motor and outputs at least one first detecting signal and at least one second detecting signal to the error determining unit. The error determining unit has a first predetermined value, wherein the error determining unit outputs a warning signal to the controlling unit while a variation value between the first detecting signal and the second detecting signal exceeds the first predetermined value. And the controlling unit will control the motor to stop operating by the driving unit in accordance with the warning signal. And a motor detecting and protecting method is also disclosed. | 06-17-2010 |
20100177451 | Motor Overload Protecting Method - A motor overload protecting method includes (a) detecting an instantaneous motor current value in real-time, calculating a current integral value in each of a corresponding integral period, and resetting the current integral value to 0 at an end of the integral period, (b) obtaining an overload coefficient according to the current integral value, which is greater than or equal to 0 and less than 1 when the current integral value is greater than or equal to a maximum motor current value, and is equal to 1 when the current integral value is less than the maximum motor current value, wherein the maximum motor current value is a maximum current integral value when the motor is in a non-overload condition; and (c) multiplying the instantaneous motor current value by the overload coefficient to obtain a new input current value, and operating the motor according to the new input current value. | 07-15-2010 |
20100208395 | SURGE CURRENT PROTECTION CIRCUIT AND MOTOR USING THE SAME - A surge current protection circuit, has a control unit having an output end, a photoelectric coupling and driving circuit, a silicon symmetrical switch having a control end, and a current-limiting resistor. The current-limiting resistor and the silicon symmetrical switch are parallel connected altogether and then serially connected to a load and an AC input, and the control end of the silicon symmetrical switch is connected to the output end of the control unit via the photoelectric coupling and driving circuit. The invention features low production cost, high reliability and improved power efficiency, and is capable of effectively suppressing surge current. | 08-19-2010 |
20100214702 | OVER-CURRENT PROTECTION CIRCUIT AND MOTOR CONTROLLER COMPRISING THE SAME - An over-current protection circuit, has a main transmission circuit including at least a first triode and a first resistor, a trigger circuit including a second triode and a second resistor, and a detecting circuit having an input terminal and an output terminal. One end of the first resistor is connected to one end of a collecting electrode and an emitting electrode of the first triode. The other end of the first resistor is connected to a current output. The other end of the collecting electrode and the emitting electrode of the first triode is connected to a current input. One end of the second resistor is connected to a collecting electrode of the second triode. The other end of the second resistor is connected to the ground. An emitting electrode of the second triode is connected to the current input. The collecting electrode of the second triode is connected to a base electrode of the first triode. The input terminal of the detecting circuit is connected to the current output whereby extracting a detecting signal therefrom. The output terminal of the detecting circuit is connected to a base electrode of the second triode | 08-26-2010 |
20110026172 | POWER SUPPLY CONTROLLER - In a system comprising a fuel and a rotating electrical machine, damage of a switching element is prevented when the rotating electrical machine becomes a locked state. In a power controller, it is monitored whether the rotating electrical machine is in the locked state or not. When the rotating electrical machines is judged to be in the locked state, a command for dropping output voltage is given to the fuel cell. Thus, inverter input voltage can be dropped, loss power of the switching element in the rotating electrical machine is dropped and damage can be suppressed. The rotating electrical machine is monitored to cancel the locked state or not while dropping of inverter input voltage is controlled. When the locked state is judged to be canceled, control of the fuel cell is returned to a state of regular operation control. | 02-03-2011 |
20110110001 | MOTOR OVERLOAD PROTECTING DEVICE, MOTOR START DEVICE, BACKUP PROTECTING ELEMENT AND PROCESS FOR OBTAINING A BACKUP PROTECTING ELEMENT - The present invention refers to an electric overload protecting device ( | 05-12-2011 |
20110228429 | POWER FEEDING CIRCUIT - A controller | 09-22-2011 |
20110286133 | Fault Clearing Method for Permanent Magnet Machines - A permanent magnet machine (PMM) has a kinetic portion electrically coupled to a power conversion portion. Motive power is provided to the kinetic portion by a torque applied to a motive shaft coupled to a prime mover, such as an aircraft engine or an automobile engine. Generated power is transmitted through a plurality of electrically isolated output feeder cables. When a fault is detected, a switch is opened stopping the flow of current through the feeder cable associated with the faulty circuit. The fault condition is then rendered safe while the prime mover may continue normal operation. | 11-24-2011 |
20120092797 | OVERLOAD RELAY - An overload relay protects a motor or other device from an overload condition and a power supply unit supplies power to the overload relay. The overload relay has: shunt resistors, each being locatable in the current path of a respective supply line of a power supply for the motor or other device; and control mechanism connected to each shunt resistor and arranged to receive signals representative of current through each shunt resistor. The control mechanism produces a trip signal to interrupt the continuity of the power supply if it determines that an overload condition exists based on one or more of the signals. The power supply unit has: a rectifier producing a direct current from one or more supply lines of an AC power supply connected to the motor or other device; and at least one transformer coupling the power supply unit to the overload relay. | 04-19-2012 |
20120275069 | ELECTRIC MACHINE ASSEMBLY WITH FAIL-SAFE ARRANGEMENT - An electric machine assembly with fail-safe arrangement is described. The assembly comprises a stator including a plurality of windings and a cooperating rotor including at least one permanent magnet; a detector configured to detect DC current in at least one of the windings of the stator; and a bypass circuit configured to be activated upon detection of the DC current by the detector and to prevent at least some of the DC current from flowing into the at least one of the windings of the stator. | 11-01-2012 |
20120293894 | SUPERVISION AND PROTECTION FOR AN ELECTRIC CAPSTAN - A supervision and protection device for an electric capstan that is able to provide an alarm, has good reliability and a long life time, and only requires a short period of time to recover to use after overloading. The supervision and protection device may include an overload signal collection module, a central processing module and an executing module. The overload signal collection module includes a current diverter, one end of which is electrically connected to the negative pole of the DC electrical motor of the electric capstan and the central processing module, and the other end of which is grounded. The executing module includes a sound alert unit and an electrical motor ON/OFF control unit, and the electrical motor ON/OFF control unit is provided to control the start/stop of the ON/OFF unit which is in series connected to the input circuit of the DC electrical motor. The central processing module is also electrically connected to the sound alert unit and the electrical motor ON/OFF control unit. | 11-22-2012 |
20120293895 | PROTECTION CIRCUIT FOR BRUSHED DC MOTOR - A protection circuit for brushed DC motors connected between an AC power supply input and a rectifier circuit, including a power supply line, a power supply circuit, an AC detection circuit, a rectifier/filter voltage-stabilizing circuit, a microprocessor, a drive circuit, and a switching unit. The switching unit is connected to the power supply line in series. An input terminal of the power supply circuit is connected with the AC power supply input. The AC detection circuit receives current signals from the power supply line. The current signals are processed by the rectifier/filter voltage-stabilizing circuit and sent to the microprocessor. An output terminal of the microprocessor is connected to an input terminal of the drive circuit, and the drive circuit controls the switching unit to connect or disconnect the power supply circuit. | 11-22-2012 |
20130027817 | MICRO ELECTRO-MECHANICAL SWITCH (MEMS) BASED OVER CURRENT MOTOR PROTECTION SYSTEM - An over current protection system includes a current sensing member configured and disposed to output an electrical rate of change signal that is indicative of a rate of change of an electrical current being in excess of a predetermined value, at least one micro electro-mechanical switch (MEMS) device operatively connected to the current sensing member, and a controller electrically coupled to each of the current sensing member and the at least one MEMS device. The controller is configured and disposed to open the at least one MEMS device in response the electrical rate of change signal. | 01-31-2013 |
20130070373 | Method For Compensating Overload Trip Curve For CT Error - A digital thermal model for compensating for error in a current transformer used in a solid-state overload relay. The thermal model implements a difference equation that determines using a low-pass filter two parameters corresponding to calibration points along an overload trip curve. The trip curve is adjusted at an ultimate trip current (one calibration point) independently of a trip time at a locked rotor current (another calibration point) of a motor protected by the overload relay. The ultimate trip current and trip time can be adjusted based on a motor full load current set by a user. Large CT error will cause the thermal model to adjust the trip time at the locked rotor current, increasing the range of acceptable CT error, allowing the overload relay to have a wider adjustment range. | 03-21-2013 |
20130077194 | PROTECTION OF MOTOR DRIVE SYSTEMS FROM CURRENT SENSOR FAULTS - Methods and apparatus are provided for detecting a phase current sensor fault in a multi-phase electrical motor. The method comprises, receiving an input torque command T* and measuring a set of feedback signals of the motor including a phase current Ix for each of the phases of the motor, generating direct and quadrature command phase currents Id*, Iq* for the motor corresponding to a value of the input torque command T*, determining a total command current Is=[(Iq*)2+(Id*)2]½, generating a negative sequence current Ineg, where for three phases Ineg=(⅓)[Ia+(α2)Ib+(α)Ic], where α=ej2π/3, combining Ineg and Is to provide a normalized negative sequence current Inn=Ineg/Is, comparing the normalized negative sequence current Inn to a predetermined threshold value INN* to determine the presence of a phase current sensor fault, and executing a control action when Inn>INN*. | 03-28-2013 |
20130083434 | Diagnosis of Over-Current Conditions in Bipolar Motor Controllers - A circuit for controlling a load current through a coil is connected to an output port of a transistor H-bridge that includes two low side transistors and two high side transistors. A current sense circuit is coupled to the H-bridge and configured to provide a representation of the load current provided by the output port. A current regulator is configured to generate a modulated signal dependent on the representation of the load current and a current set-point. The modulated signal has a duty-cycle. A gate control logic drives the individual transistors of the H-bridge on and off in accordance with the modulated signal. A direction signal provides the load current to the coil. The direction signal determines the direction of the load current. An over current detection circuit is coupled to each individual transistor and is configured to signal an over-current by providing an active over-current failure signal when a transistor current through the respective transistor exceeds a respective maximum value. | 04-04-2013 |
20130229732 | FEEED CHAIN FOR A SYNCHRONOUS ELECTRIC MACHINE, ELECTRIC TRACTION SYSTEM COMPRISING SUCH A CHAIN, AND CONTROL METHOD FOR SUCH A CHAIN - A feed chain ( | 09-05-2013 |
20130235494 | Integrated Bypass Apparatus, System, and/or Method for Variable-Frequency Drives - In the field of variable-speed motor control, a bypass circuit and corresponding bypass electronics can be integrated advantageously with a variable-frequency drive (“VFD”) circuit and corresponding electronics. Such an integrated bypass can be disposed within a single unitary enclosure housing the VFD. Some advantages of the integrated bypass include reduced size, cost, and/or complexity in the combined VFD/bypass assembly, the ability to manage airflow in bypass without running a fan motor full time, and support for integrated power metering. | 09-12-2013 |
20130242439 | Motor Protection and Control Apparatus, System, and/or Method - In the field of motor protection for industrial automation systems, HVAC systems, pumping systems, and/or similar implementations, improved motor starters and overload electronics can be configured to offer substantially automatic levels of protection for motors, independent of such starters and/or overload electronics first being calibrated for, or properly calibrated for, the motor. | 09-19-2013 |
20130286514 | POWER CONVERSION APPARATUS - A controller for switching an inverter includes a current detecting unit, an overcurrent level determining unit which determines an overcurrent level for stopping the inverter in accordance with a value corresponding to the number of revolutions of a motor, a current comparing unit which compares a detected output current value of the inverter with the overcurrent level, and a gate signal generating unit which generates a signal for turning off all semiconductor switching devices of the inverter when the current comparing unit makes a determination that the detected output current value has reached the overcurrent level. The overcurrent level is lowered as the number of revolutions of the motor increases. | 10-31-2013 |
20130314822 | MOTOR PROTECTION RELAY TO OPTIMISE THE MONITORING AND PROTECTION OF AN ELECTRIC MOTOR - The invention concerns a monitoring method and system for monitoring an electric motor, comprising: | 11-28-2013 |
20140092501 | MOTOR CONTROLLER WITH REVERSE-BIAS PREVENTING MECHANISM - A motor controller with a reverse-bias preventing mechanism includes a pre-charging unit, a protection unit, a conversion unit and a control unit. The pre-charging unit receives a power signal through a first electric-conduction path, and converts the power signal into a pre-charging signal according to a control signal. The protection unit receives the power signal through a second electric-conduction path, and determines whether to output the power signal, according to the polarity of the power signal. The conversion unit, coupled to the protection unit, receives the power signal outputted by the protection unit, and converts the power signal into a work voltage. The control unit, coupled to the conversion unit and the pre-charging unit, receives the work voltage to generate the control signal. The current of the power signal flowing through second electric-conduction path is smaller than the current flowing through first electric-conduction path. | 04-03-2014 |
20140160602 | METHOD AND SYSTEM FOR DETECTING FAULT OF SERIAL COIL TYPE PERMANENT MAGNET MOTOR - A method and system for detecting a fault of a serial coil type permanent magnet motor includes driving the motor based on a predefined current reference value, detecting a phase current vector of the motor, and calculating a current compensation value for removing a negative sequence component of the motor based on the phase current vector. The current compensation value is provided to a negative sequence current controller for calculating a faulty phase and a degree of a fault of the motor using the output of the negative sequence current controller and a fault model to which induced magnetic flux variations in a specific slot of a specific faulty phase of the motor and other slots of the same phase as the specific phase are applied, and applying a current reference value to which the calculated faulty phase and degree of fault are applied. | 06-12-2014 |
20140168827 | MOTOR PROTECTION SYSTEM - System and methods for protecting motors of a vehicle are provided. A system includes a current transformer device for each phase of the three-phase power received by each protected motor. Each current transformer device includes a switch that is normally in a first position and is configured to monitor an output current of fuse through which the power is transmitted, compare the output current to a threshold current level, and, when the output current is below the threshold current level, change the switch to a second position. The system also includes a processing circuit configured to control operation of the one or more motors of the vehicle. The processing circuit is configured to determine whether one or more of the switches of the plurality of current transformer devices is in the second position and, if so, activate a fault condition. | 06-19-2014 |
20140268432 | MULTIMOTOR VARIABLE FREQUENCY OVERLOAD - An apparatus for protecting a motor includes two or more motor overloads, within a motor overload enclosure, protecting two or more motors. Each motor overload includes one or more current sensors where each current sensor includes a magnetic core and each current sensor includes a conductor positioned within the magnetic core where the conductor providing power to a motor protected by the two or more motor overloads (“protected motor”). Each motor overload includes a motor trip module that stops current flow to the protected motor in response determining that a thermal state of the protected motor has reached a thermal limit. Determining that the protected motor has reached a thermal limit includes using a current signal from at least one current sensor of the one or more current sensors that senses current of the protected motor to determine a thermal state of the protected motor. | 09-18-2014 |
20150015998 | SOLID STATE SWITCH - A solid-state switch includes a plurality of transistors connected in parallel and a plurality of fuses. Each fuse is connected in series with a separate one of the plurality of transistors. A combination of current ratings of the plurality of fuses is greater than a load current of a load connected to the plurality of transistors and the plurality of fuses, and a current rating of each separate fuse of the plurality of fuses is less than the load current. | 01-15-2015 |
20150098157 | VEHICLE POWER CONTROLLING APPARATUS - The present invention relates to a vehicle power controlling apparatus, and more particularly, to a vehicle power controlling apparatus for interrupting a dark current from an ECU power front stage of a motor driven power steering (MDPS) system. | 04-09-2015 |
20150131185 | CONFIGURABLE MODULAR INTELLIGENT ELECTRONIC OVERLOAD DEVICE AND SYSTEM WITH EMBEDDED PROGRAMMING TOOL - A modular intelligent electronic overload device that requires only a single configuration file to describe the device with all of the available options. Furthermore, the modular intelligent electronic overload device contains embedded application files that provide commonly used control algorithms into the non-volatile memory of the modular intelligent electronic overload device that can be accessed by a user to configure the device without the need for a personal computer. Finally, the modular intelligent electronic overload device configuration parameters can be stored to virtual non-volatile memory contained in an associated user interface device, allowing for easy replacement of the modular intelligent electronic overload device. | 05-14-2015 |
20150303676 | SWITCHGEAR FOR CONTROLLING THE ENERGY SUPPLY OF AN ELECTRIC MOTOR CONNECTED THERETO - An embodiment of the invention relates to a switchgear which includes a control unit, a supply connection and a first current path. The first current path includes a first electromechanical switch and, connected in series to the first switch, a parallel connection of a second electromechanical switch to a semiconductor switch. The switchgear includes an energy accumulator and a measuring device. A control unit is capable of monitoring energy supply coming in through the supply connection. If the energy supply through the supply connection reaches a critical range, the control unit controls the output of the switching signals via the energy of the energy accumulator such that: in a first step, the semiconductor switch is switched to be electrically conducting and the second switch is then opened, and in a second step, the semiconductor switch is switched to be electrically non-conducting and the second switch is then opened. | 10-22-2015 |
20150311692 | DRIVE PROTECTION CIRCUIT, SEMICONDUCTOR MODULE, AND AUTOMOBILE - It is an object of the present invention to provide a technology capable of reliably suppressing a surge voltage even in a case where noise having a small pulse width is generated. A drive protection circuit that drives and protects a switching element includes a gate driving circuit that drives the switching element in response to a gate driving signal and an overcurrent protection circuit that operates a soft cutoff circuit upon an overcurrent of the switching element, the soft cutoff circuit causing the switching element to transition from ON to OFF at a switching speed slower than that of the gate driving circuit. In the drive protection circuit, in a case where a pulse width of ON of the gate driving signal is less than or equal to a response time of the overcurrent protection circuit, the drive protection circuit operates the soft cutoff circuit to cause the switching element to transition from ON to OFF, regardless of the overcurrent. | 10-29-2015 |
20160103157 | RATIO METRIC CURRENT MEASUREMENT - The total current flow in a given electric circuit path is estimated by measuring the current in a second parallel current path and applying a ratio of the conductivity of the main and secondary path. Earth leakage current is measured by passing three wires through a toroid so as to detect differential current flow. Each wire is a conduction path wire parallel to each phase cable. The relative harmonic content between the fundamental and higher frequency components of a load current are calculated using a conduction path parallel to the main power cables. | 04-14-2016 |
20160254661 | VEHICLE | 09-01-2016 |