Abstract: The present disclosure relates to a lighting device that employs at least one string of LEDs as a lighting source. The string of LEDs is coupled in series with a first semiconductor switch, wherein the string of LEDs and the first semiconductor switch are coupled between a power supply node and ground. During a period when the lighting device is powering up after being initially provided power by a power supply, the system controller is configured to monitor a drive current through the first string of LEDs and modulate a control signal provided to the first semiconductor switch based on the drive current to prevent the drive current from exceeding a maximum allowable drive current value for the first string of LEDs.

Abstract: A diagnostic system for a vehicle includes a traction battery including a plurality of cells, and a controller configured to indicate an overcurrent condition in response to battery current being greater than a value of an upper limit of a current sensor and a difference between a measured battery voltage and an estimated battery voltage, that is based on the value, being greater than a threshold.

Abstract: A system for measuring an output current of a DC-to-DC converter with a transistor power stage includes a voltage measuring circuit and an impedance. The voltage measuring circuit, which is connected to the output of the power stage of the DC-to-DC converter, measures an average voltage drop on impedances of the transistors of the power stage. The impedance, which is connected to an output of the voltage measuring circuit, reproduces the impedances of the transistors of the power stage and is traversed by a scaled version of the current output of the voltage measuring circuit.

Abstract: A battery including an output terminal, an electric storage device, a monitoring apparatus including a detector and a controller, the detector being configured to detect a variation value corresponding to an amount of charge of the electric storage device, a relay connected to the output terminal and the electric storage device, and a communication unit connected to the controller. The controller is configured to execute an opening process to switch a state of the relay from a closed state to an open state and to cause the communication unit to receive an input signal from outside.

Abstract: A power supply device and an overvoltage protection method are disclosed. The power supply device includes an energy storage unit, a first switch, a second switch and a driving module. The energy storage unit generates a driving voltage according to a supplied voltage. The first switch selectively transmits the supplied voltage to the energy storage unit according to a first driving signal. The second switch is selectively conducted to adjust the driving voltage according to a second driving signal. The driving module conducts the second switch when the supplied voltage is rose at a first predetermined value, and generates the first driving signal and the second driving signal after the supplied voltage is rose at a second predetermined value. The first predetermined value is smaller than the second predetermined value.

Abstract: A power converter includes a voltage conversion unit that provides a first driving voltage at a first output electrode by converting a power supply voltage in response to a first control signal, the voltage conversion unit being configured to provide a second driving voltage at a second output electrode by converting the power supply voltage after a short detection period, the voltage conversion unit being configured to shut down in response to a third control signal, and a short detection unit that generates the third control signal by comparing a magnitude of a voltage of the second output electrode with a magnitude of a reference voltage during the short detection period.

Abstract: A first dissipative adhesive (DA) is connected to at least a portion of leads that are exposed in a first plane of a flexible cable in a coverage area. A second DA is connected over at least a portion of the first DA. A third DA is connected to a ground and over a fourth DA. A servo connection is electrically connected to a grounding tab via the third DA. A common bus bar is connected to the portion of the leads via the second DA.

Abstract: Provided are a vibration detector and a vibration detecting method, which are power saving, can detect vibration even if the vibration is very weak, and can perform both start-up of the apparatus and collection of data of vibration information by the use of only one sensor. The apparatus includes a vibration detector, a semiconductor switch, a controller and a power supply. The semiconductor switch and the controller are connected to the power supply. The vibration detector detects vibration and consequently generates a vibration voltage. The semiconductor switch includes a voltage divider for generating a bias voltage inside. The semiconductor switch detects a voltage produced by superposing the bias voltage onto the vibration voltage outputted from the vibration detector, and conducts current when the detected voltage is equal to or larger than a certain value. The controller wakes up with the current conducted by the semiconductor switch as a trigger signal.

Abstract: Systems and methods are provided for reliable redundant power distribution. Some embodiments include micro Automatic Transfer Switches (micro-ATSs), including various components and techniques for facilitating reliable auto-switching functionality in a small footprint (e.g., less than ten cubic inches, with at least one dimension being less than a standard NEMA rack height). Other embodiments include systems and techniques for integrating a number of micro-ATSs into a parallel auto-switching module for redundant power delivery to a number of devices. Implementations of the parallel auto-switching module are configured to be mounted in, on top of, or on the side of standard equipment racks. Still other embodiments provide power distribution topologies that exploit functionality of the micro-ATSs and/or the parallel micro-ATS modules.

Abstract: A device for limiting disturbances of an electrical nature, such as currents induced by overvoltages caused by these disturbances, in particular electromagnetic, for example relating to events of lightning type in an electrical installation, including at least one protection apparatus of isolator or differential breaker type intended to protect at least one downstream electrical installation having at least one load and being powered between a neutral conductor and at least one phase conductor and including an earth link. A common-mode low-pass filter is connected in parallel between the neutral and each phase on one hand, and earth on the other hand.

Abstract: A current detection device for detecting an electric current flowing through an inverter, an overcurrent level generation device for generating an abnormality judgment reference value, an overcurrent detection device for generating an interruption signal to the inverter on the basis of an output of the current detection device and the abnormality judgment reference value, and an adjusting apparatus for correcting the abnormality judgment reference value of the overcurrent level generation device on the basis of the output at a time when a constant electric current is applied to the current detection device are provided. The overcurrent level generating device is provided with one or a plurality of resistance value adjusting sections, and generates the abnormality judgment reference value in correspondence to a resistance value of the resistance value adjusting section.

Abstract: Techniques for controlling charging of a high voltage therapy energy storage component are provided to reduce any undesirable impact from charging during unusual operating conditions. Unusual operating conditions may be caused by any of a number of external factors, including saturation of charging transformer core, circuit failures, capacitor mismatches, or the like, which may result in an unexpected power supply voltage drop or abnormally high currents through device components. An implantable medical device may comprise a power source, a therapy module that includes at least one energy storage component, and a charging module coupled between the power source and the therapy module. The charging module is configured to obtain a measurement representative of an average power drawn from the power source and to terminate charging of the at least one energy storage component based at least on the measurement representative of an average power drawn from the power source.

Abstract: An electronic device for generating an error signal in response to an electrostatic discharge perturbation is described. The device may comprise: a detection unit for generating a detection signal in response to said electrostatic discharge perturbation, said detection signal correlating in time with said electrostatic discharge perturbation; a clock for generating a clock signal having a clock period; and a protection unit for generating an error signal in response to said detection signal only when a duration of said detection signal exceeds a predefined multiple of said clock period. A method of generating an error signal in response to an electrostatic discharge perturbation, for protecting electronic circuitry, is also disclosed.

Abstract: A driver circuit for turning ON and OFF one of two parallel-connected insulated-gate semiconductor elements includes a voltage control circuit that controls a level of a power supply voltage in response to a detected element temperature of the one semiconductor element, a constant current supply section, responsive to a drive signal, for supplying a constant current to a gate of the one semiconductor element to turn the one semiconductor element ON, the power supply voltage being supplied to the constant current supply section from the voltage control circuit, and a discharge circuit, responsive to the drive signal, for discharging an electric charge accumulated in the gate to turn the one semiconductor element OFF.

Abstract: A voltage supply for providing a clamped voltage to a circuit element to be protected against electrical overstress (EOS) has a reference voltage module and a voltage clamp module. The reference voltage module has a first field-effect transistor (FET) whose source and drain are connected in series between a programmable reference current source and a first resistor across a power supply. The gate of the first FET is connected to its drain to provide a reference voltage defined by the reference current flowing in the first resistor. The voltage clamp module has a second FET whose gate receives the reference voltage and whose source is connected to provide to the protected circuit element the clamped voltage whose variation is limited by the reference voltage.

Abstract: Power circuitry is disclosed for protecting an electronic device during an overvoltage event. A voltage clamp is connected in parallel with a charge pump, wherein the voltage clamp limits an input voltage of the charge pump. A current limiting resistor couples a supply voltage to the voltage clamp and to the charge pump. A power transistor couples the supply voltage to a load, wherein a gate of the power transistor is controlled by an output of the charge pump during a power-on operation. When the supply voltage exceeds a threshold thereby activating the voltage clamp, the current limiting resistor limits a current flowing through the voltage clamp.

Abstract: A lighting fixture for visible light communication is configured to modulate light intensity of a light source (11) comprising a light-emitting device (2) to superpose a communication signal on illumination light. The lighting fixture includes: a power supply circuit (3) configured to control light output of the light source (11) based on a dimming signal; a switch device (Q1) for modulating an output current from the power supply circuit (3) to the light source (11); an impedance element (Rx); a communication circuit (4); and an ON circuit (6). The communication circuit (4) is configured to supply a modulation signal to a side of the switch device (Q1) to superpose the communication signal on the illumination light. The ON circuit (6) is configured to turn on the switch device (Q1) by supply power from the power supply circuit (3) when the communication circuit (4) is inactivated.

Abstract: A peripheral component interconnect (PCI) adapter includes a PCI connector for connecting to a PCI slot of a motherboard, a first PCI expansion slots for connecting a first PCI card, a second PCI expansion slot for connecting a second PCI card, a detection control circuit connected to the first PCI expansion slot and the second PCI expansion slot, and an alarm circuit connected to the detection control circuit. The detection control circuit detects operation power of the first PCI card and the second PCI card, and controls the alarm circuit to report a fault alarm when the operation power of the first PCI card exceeds a threshold power of the first PCI expansion slot or the operation power of the second PCI card exceeds a threshold power of the second PCI expansion slot.

Abstract: A method of operating a wind turbine plant is provided. Such a wind turbine plant comprises at least one transmission branch comprising a plurality of wind turbine generators and coupled to an electrical grid at a point of common coupling through at least one circuit breaker comprising a breaking capacity. The method comprises monitoring the electrical grid for a low voltage fault event; and if a low voltage fault event is detected: calculating a grid short circuit strength, determining a short circuit current limit if the grid short circuit strength requires an initial fault current contribution which exceeds the breaking capacity of the circuit breaker to be passed through the circuit breaker, determining a maximum fault current contribution based on the short circuit current limit and operating the wind turbine generators to provide to the electrical grid the maximum fault current contribution.

Abstract: An interlock switching circuit for protecting an electrical on-board power supply for an electrically drivable vehicle includes a conductor loop, a first current source, a first current mirror and a second current mirror. The first current source is configured to drive a current flowing out of an input of the first current mirror into an input of the second current mirror. The conductor loop is connected between an output of the first current mirror and an output of the second current mirror.

Abstract: The manufacturing method of a chip electronic component may include: forming a coil pattern part on at least one surface of an insulating substrate; forming a thin polymer insulating film to follow a surface shape of the coil pattern part; forming a primer insulating layer on one surface of a magnetic sheet; disposing the magnetic sheet on which the primer insulating layer is formed on an upper portion and a lower portion of the insulating substrate on which the coil pattern part is formed and pressing the magnetic sheet to form a magnetic body in which an additional insulating film is formed on the coil pattern part; and forming an external electrode on at least one end surface of the magnetic body so as to be connected to the coil pattern part.

Abstract: An inverter device (1), including a first inverter (10), and a second inverter (20) connected in parallel to the first inverter. Both the first and second inverters (10, 20) are three-level inverters. The first and second inverters (10, 20) generate first and second output voltages (V1, V2) using the voltage (Vc) at the connection point between a first capacitor (C1) and a second capacitor (C2) connected in series and evenly allocating a power supply voltage (Vin). A control circuit (40) duty-controls the second inverter at high frequency, when the second inverter (20) switches the level of the second output voltage (V2).

Abstract: A secondary power source system for a communication device includes a charging unit configured to receive a primary power input and restrict a current used for charging to a predetermined amount. The current is part of a first output of the charging unit. The system further includes a storage unit including a device that stores electrical energy, the storage unit configured to receive the first output from the charging unit with restricted current and generate a second output, a regulating unit configured to receive the second output from the storage unit and generate a third output, a selector unit configured to perform a logical OR operation with the primary power input, the first output from the charging unit and third output from the regulating unit, and to generate a fourth output, and a shutdown unit configured to shutdown operation of the secondary power system when the storage unit has been expended.

Abstract: Embodiments of the invention relate to electrostatic discharge (ESD) protection. One embodiment includes a first dissipative adhesive (DA) connected to at least a portion of multiple leads in a first plane of a flexible cable in a coverage area for providing ESD protection to at least one element of an electronic device. A common bus bar is connected to the leads in a second plane of the flexible cable. Conductivity of the common bus bar is greater than conductivity of the first DA and the first plane and the second plane are different planes of the flexible cable.

Abstract: Systems and methods are provided that may be implemented for overvoltage protection of bulk capacitors employed in power factor correction (PFC) circuitry components of switched mode power supply units (PSUs) using one or more inductive overvoltage feedback protection paths (OVPs) to monitor a voltage indicative of a PFC bulk capacitor by sensing the real time voltage at one or both of the primary and/or secondary side windings of a PSU transformer, and/or using an auxiliary windings of a PSU transformer.

Abstract: A protecting circuit connected between a power supply and a load includes an interface unit, a switching unit, a protection module, a locking unit, and a trigger unit. The interface unit is used for connecting to the load. The switching unit turns on to establish a connection between the power supply and the load when the interface connects to the load and turns off to cut off the connection. The protection module generates a protecting signal when the output of the power supply is in an abnormal state, and the locking unit controls the trigger unit to generate a control signal. The switching unit cuts off the connection in response to the control signal. When the output of the power supply resumes to a normal state, the switching unit automatically resumes the connection by reconnecting the interface with the load.

Abstract: An embodiment of a measuring circuit for measuring the leakage current flowing in a portion of an electronic device when said portion is biased by a biasing unit of the electronic device is proposed. The measuring circuit includes a first section configured to generate a threshold current, a second section configured to receive the leakage current, a third section configured to compare the threshold current with the leakage current, and a fourth section configured to generate an output voltage based on the comparison between the threshold current and the leakage current. Said first section is configured to set the value of said threshold current to a different value at each reiteration of an operating cycle. Said fourth section is configured to measure said leakage current based on a detection of a change in the value of the output voltage between two reiterations of the operating cycle.

Abstract: An exemplary motor driving system includes a power source, a driving circuit, a controller, a motor, and a protection circuit. The driving circuit including at least one switching device coupled with the power source. The motor includes a plurality of windings. The motor is coupled with the driving circuit and driven by the driving circuit. The controller is configured to provide first switch signals to the at least one switching device of the driving circuit in a normal mode. The protection circuit is coupled with the controller, and configured to generate second switch signals based at least in part on a fault signal in a fault mode and provide the second switch signals to the at least one switching device of the driving circuit so as to reconstruct circuit loops between the driving circuit and the plurality of windings. A method for operating the motor driving system is also described.

Abstract: A control circuit with deep burst mode for power converter according to the present invention comprises a load detection circuit and a PWM circuit. The load detection circuit generates a switching control signal in response to a feedback signal. The feedback signal is correlated to a load condition of the power converter. The PWM circuit generates a switching signal to regulate an output of the power converter in response to the switching control signal and the feedback signal. The control circuit performs a deep burst mode to switch the switching signal only one time during each deep burst period when the load condition of the power converter is a very light-load. Therefore, switching loss is reduced so that the power consumption of the power converter is also reduced.

Abstract: The power supply device includes a transformer that includes primary, secondary and auxiliary windings; a switching unit that switches current flowing to the primary winding of the transformer; a current detection unit that detects current flowing through the primary winding, and outputs a voltage according to the current; a control unit that controls switching operation of the switching unit, according to the voltage output from the current detection unit; a first voltage detection unit that detects a voltage induced in the auxiliary winding; and a correction unit that corrects the voltage output by the current detection unit to the control unit when the voltage induced in the auxiliary winding and detected by the first voltage detection unit is higher than a first predetermined value. This configuration can reduce start-up power consumption while suppressing the vibration noise of the transformer.

Abstract: An electromagnetic induction heating apparatus comprises: a resonance circuit that includes a inductor and a capacitor; a direct-current electric power supply; and a switching element performing ON and OFF switching of electric power supplied to the resonance circuit by the direct-current electric power supply; performs intermittent control of the electric power supply by controlling the ON and OFF switching at regular intervals, and by performing control to stop the electric power supply when not controlling the ON and OFF switching, wherein during the intermittent control, the switching control unit performs gradual control such that, upon beginning the control of the ON and OFF switching, the electric power supply gradually increases to reach a target value, and upon stopping the control of the ON and OFF switching, the electric power supply gradually decreases from the target value until stopping, such that the gradual decrease involves fewer steps than the gradual increase.

Abstract: An AC tied inverter connectable to an AC source, the AC tied inverter including a DC to DC current fed push-pull converter operable to generate a current waveform from a DC voltage source, the current waveform being substantially synchronized to the AC source, the push-pull converter including a transformer including a first side connectable to a battery and a second side connectable to the AC source, wherein each of the two primary sides is connected to ground via a switching transistor; and respective voltage clamps are connected between the respective primary side of the transformer and the respective switching transistor, the voltage clamp commutating the current from the respective primary side of the transformer when the switching transistor is turned off.

Abstract: Electro-hydraulically boosted hydraulic braking system having a master cylinder (100) including a thrust chamber (105) and on command receives pressurized brake fluid from an accumulator (300) via an electrically operated valve (200) controlled by a computer (400) on the basis of the signal supplied by the brake pedal (411) sensor (410), and an electrical power source (450) powering at least the electrically operated valve (200), the computer (400) and the sensor (410). An auxiliary generator (470) is connected in a manner that is controlled (472) by the computer (400) to the circuit (L0, L1, L2, L3) powering the computer (400), the sensor (410) and the electrically operated valve (200) if failure of the main source (450) is detected so as to allow emergency operation of the electrically operated valve (200) and allow the brake circuit (C1, C2) to be powered for a limited number of braking actions.

Abstract: A switching power-supply device which includes a control unit configured to perform a switching control; and a resonance current detection unit configured to detect the resonance current flowing through the series resonance circuit. When an absolute value level of the resonance current exceeds a second threshold greater than a first threshold, the control unit inverts the turn on-and-off state of the first switching element or the second switching element at the time when the absolute value level reaches a third threshold between the first threshold and the second threshold. When the absolute value level of the resonance current exceeds the first threshold and does not exceed the second threshold, the control unit inverts the turn on-and-off state of the first switching element or the second switching element at the time when the absolute value level reaches the first threshold.

Abstract: The power supply apparatus includes a transformer having a primary and secondary sides, a first line and a second line to which an AC voltage is input from an AC power supply, a rectifying and smoothing unit that rectifies and smoothes the AC voltage, a shut-off unit provided between the first line and the rectifying and smoothing unit, a switching element that switches a current from the rectifying and smoothing unit to the primary side of the transformer, a first overvoltage detection unit that outputs a voltage corresponding to the AC voltage, a second overvoltage detection unit that outputs an overvoltage detection signal; and a control unit that controls the shut-off unit to shut off the input of the AC voltage.

Abstract: A motor-driven appliance includes a battery; a motor including permanent magnets as field magnets; a momentary maximum current upper limit storage unit in which a predetermined momentary maximum current upper limit is stored; a current detection unit that detects a current flowing in the motor; a current threshold setting unit that generates a current threshold based on the momentary maximum current upper limit, and outputs the generated current threshold; a current exceedance determination unit that determines whether the current detected by the current detection unit has become equal to or greater than the current threshold, and outputs an interruption signal used to interrupt a current path from the battery to the motor when the detected current has become equal to or greater than the current threshold; and a current flow interruption unit that interrupts the current path when the interruption signal is outputted from the current exceedance determination unit.

Abstract: A power supply apparatus includes a main converter, a voltage superposition circuit, a voltage detection circuit and a pulse width modulation controller. The voltage superposition circuit is electrically connected to the main converter. The voltage detection circuit is electrically connected to the main converter and the voltage superposition circuit. The pulse width modulation controller is electrically connected to the main converter and the voltage detection circuit. The main converter includes a sensing resistor. The voltage detection circuit detects a sensing voltage of the sensing resistor. The voltage superposition circuit supplies a superposition voltage to the voltage detection circuit when an output voltage of the power supply apparatus is less than a predetermined output voltage, and then the voltage detection circuit sends the sensing voltage and the superposition voltage to the pulse width modulation controller.

Abstract: Provided is a disconnection detecting apparatus for detecting whether there is a disconnection between a current signal output device and an external device receives the current signal of a PLC analog current output module. The disconnection detecting apparatus according to an embodiment includes a monitoring unit generating different voltages according to whether a current signal input from the current signal output device is applied to the external device, a reference voltage generating unit generating a reference voltage, a comparing unit outputting a voltage according to a result obtained by comparing the voltage generated from the monitoring unit with the reference voltage, and a switching unit outputting a disconnection detecting signal on the basis of the voltage output from the comparing unit.

Abstract: A magnetic field sensor has internal power supply generating circuits to generate a higher operating voltage for a magnetic field sensing element, resulting in a magnetic field sensor with improved sensitivity to magnetic fields.

Abstract: A semiconductor memory device includes a first comparative device, to which first and second voltages are input; a first capacitor, which accumulates the electrical potential of a first node; a power source, which outputs the first electric current to a second node; a resistor, which generates a third voltage in the second node; a second capacitor, which accumulates the electric potential of the second node; first switches, which make a common connection at a third node possible for the first node and the second node, to which the first capacitor and the second capacitor are connected respectively; and a second comparison device, which uses as an input voltage a fourth voltage, which is obtained as a result of the charge share between the first and the second capacitors and the electrical potential of a fourth node, and equalizes the electrical potential of the fourth node with the fourth voltage.

Abstract: An integrated circuit includes an electrically resettable fuse device. The electrically resettable fuse device has a plurality of resettable fuse modules coupled in parallel. Each resettable fuse module including a fuse element characterized by a first and a second impedance states. The plurality of resettable fuse modules are configured such that when the fuse element is in the first impedance state, and a current flowing through each fuse element in a first direction exceeds a current limit, the fuse element enters into the second impedance state. When the fuse element is in the second impedance state and, in response to a global reset signal and a local reset signal, a current is applied to the fuse element in a second direction opposite the first direction, the fuse element is reset to the first impedance state.

Abstract: In a semiconductor device, a surge voltage is lowered on turning OFF of a switching element, and output current is reduced on turning ON of the switching element in a non-saturated condition to achieve a reduced amount of self-heating. The semiconductor device can comprise a semiconductor switching element, an overvoltage protection circuit, and a resistance circuit to transmit a control signal for turning the switching element ON and OFF to a control terminal of the switching element. The semiconductor device can further comprise a voltage detecting switch that receives a signal corresponding to a voltage appearing at the output terminal of the switching element on turning OFF of the switching element, and a gate resistor change-over switch that operates according to a voltage of a timing capacitor connected to the output side of the voltage detecting switch to increase a resistance value of the resistance circuit.

Abstract: A DC-DC converter includes a voltage converter circuit having an FET 1, a short-circuit protection FET 3 that blocks a large current from flowing in the voltage converter circuit when a short-circuit failure occurs in the FET 1 or capacitors, and a detector that detects a short-circuit failure in the FET 1 or the capacitors to turn off the FET 3. The FET 1 is connected to a power supply line and also in series to the FET 3. The capacitors are connected to the power supply line and to a connection point between the FET 1 and FET 3. The detector detects a failure on the basis of the voltage at the connection point.

Abstract: A method of controlling a power feed to a load (L), wherein the load (L) can be connected to an apparatus (1) for the power feed and the power fed to the load (L) has clock-controlled signals. The method includes the steps of: detecting a temperature prevailing in the apparatus (1) by means of at least one temperature sensor (13, 14), providing a first safety function if the detected temperature is not greater than a predetermined first excessive temperature, providing a second safety function if the detected temperature is greater than the predetermined first excessive temperature, and again providing the first safety function if the detected temperature falls and reaches the first excessive temperature, wherein the first safety function includes constant cyclic clock control of the power fed to the load and the second safety function includes temporary cyclic clock control of the power fed to the load.

Abstract: A switch mode power supply having an output terminal configured to provide an output voltage, the switch mode power supply has a first switch, a second switch and a control circuit. The control circuit is configured to provide a first switching control signal to turn ON and turn OFF the first switch, and when the switch mode power supply works in a power saving mode, the first switch is turned ON if a voltage feedback signal is less than a reference voltage and a current flowing through the second switch is less than a bias current.

Abstract: The power supply voltage transition comparison circuit includes a comparator evaluation voltage setting circuit, a comparator, a voltage evaluation circuit, and an evaluation voltage setting value output circuit. The comparator evaluation voltage setting circuit generates a divided voltage of one of a power supply voltage and a reference voltage. The comparator compares the other of the power supply voltage and the reference voltage with the divided voltage. The voltage evaluation circuit evaluates the power supply voltage based on a result of a comparison between the other voltage and the divided voltage. The evaluation voltage setting value output circuit changes a ratio between the one voltage and the divided voltage based on a result of an evaluation of the power supply voltage.

Abstract: An excitation circuit includes an operational amplifier, a transistor circuit, a switch, and a pull-down resistor. The operational amplifier receives an excitation input voltage at a non-inverting input and provides an operational amplifier output. The transistor circuit receives the operational amplifier output and provides a transistor circuit output. The transistor circuit output is connected to an inverting input of the operational amplifier. The switch is connected between the operational amplifier output and the transistor circuit. The switch is opened to disconnect the operational amplifier output from the transistor circuit. The pull-down resistor is connected between an output of the switch and ground, wherein the pull-down resistor turns off the transistor circuit when the switch is opened.

Abstract: Provided is an electric vehicle control device in which a power supply device has a simple structure. A BMU power supply device (110) lowers a battery voltage to be suitable for the control voltage of a BMU (109). A flyback down-regulator (80) lowers the battery voltage to be suitable for an input of a CPU power supply device (111) which forms a control voltage for a CPU (108). A contactor (90) is disposed on a plus-side line which connects a battery (40) to a motor drive circuit (100), and is opened and closed in response to an instruction from the CPU (108). Control power for the down-regulator (80) is formed by the BMU power supply device (110), and a main switch (113) is disposed to open and close a path through which the voltage of the control power is input to the down-regulator (80).

Abstract: A circuit may be configured to reduce voltage dip or overshoot that can occur on power supply lines when current loads are turned on or off more quickly than a power supply can respond. The circuit can be configured to generate a compensation voltage that can be coupled into the supply lines when the current load changes.

Abstract: A control circuit of a DC/DC converter includes: a pulse modulator configured to generate a pulse signal; and a driver configured to switch a switching transistor based on the pulse signal. The pulse modulator includes an on signal generator to generate an on signal. The on signal generator includes: a bottom detection comparator configured to compare a voltage of one end of an auxiliary winding with a predetermined threshold voltage and generate a bottom detection signal; a first time-out circuit configured to generate a first time-out signal asserted when the bottom detection signal is not asserted; a second time-out circuit configured to generate a second time-out signal asserted when the bottom detection signal is not asserted; and a logic part configured to generate the on signal based on the bottom detection signal, the first time-out signal and the second time-out signal.