Abstract: An apparatus includes a transistor coupled between an input pin and an output pin and an overvoltage detection circuit configured to receive a serial interface signal from the input pin and generate an enable signal in response to a voltage of the serial interface signal exceeding a voltage threshold. The apparatus also includes a first circuit configured to apply a clamping voltage to a gate of the transistor based on the enable signal to regulate a voltage provided at the output pin.

Abstract: A method for generating an alternating electric current is provided. The method includes generating a plurality of component currents, superposing the component currents to form a summation current. Each component current is modulated by voltage pulses and the voltage pulses for each component current are generated by a component switching device by virtue of the component switching device generating the voltage pulses by switching between different input voltages. The method includes specifying a tolerance band for the summation current having an upper and a lower tolerance limit, where the summation current is detected and the switching of each component switching means is controlled to generate the voltage pulses for modulating the component current depending on the detected summation current with respect to the tolerance band. The plurality of component switching devices are switched at least partly or predominantly in a manner asynchronous with respect to one another.

Abstract: A system for estimating faulted area in an electric distribution system. The system includes a database storing input data, a fault detection module to estimate, based on the input data, if a new faulted area estimation process is required, a condition estimation module to estimate condition of metered protective devices, un-metered protective devices, and metered devices (PMDs), an upstream to downstream module to assess condition of each metered protective device, un-metered protective device, and metered device (PMD), starting from a feeder circuit breaker towards feeder downstream, to estimate a tripped protective device and a last metered device upstream of a fault, and a downstream to upstream module configured to assess outaged electric loads or elements towards network upstream to find the common interrupting protective device.

Abstract: A dual loop LDO voltage regulator is disclosed. The voltage regulator circuit includes a first current mirror having first and second transistors having source terminals coupled to an input voltage node. The circuit further includes a second current mirror having third and fourth transistors, wherein drain terminals of the third and fourth transistors are coupled to drain terminals of the first and second transistors, respectively. A feedback circuit is coupled between source terminals of the third and fourth transistors, and is configured to generate a feedback signal based on a reference voltage and an output voltage present on the source terminal of the fourth transistor. The first and second current mirrors form a first control loop, and wherein the first and second current mirrors and the feedback circuit form a second control loop.

Abstract: A switched-mode power controller includes a primary side controller circuit configured in a startup mode of operation to generate a fixed switching frequency pulse width modulation (PWM) signal with incrementing duty-ratio value. The PWM signal drives a main-switch that charges an inductive device with stored energy and discharges the stored energy into a capacitor on a secondary side to generate a power controller output voltage. Based on a comparison of the power controller output voltage with a reference voltage, the primary side controller circuit is configured to stop the incrementing of the duty-ratio of the PWM signal and begin a quasi-resonant mode of operation during which the primary side controller circuit reduces a number of valleys detected in one or more off-times of the main-switch in one or more respective main-switch switching periods.

Abstract: Disclosed herein are synchronous rectifier control techniques for Discontinuous Current Mode (DCM) converters. These techniques may be particularly advantageous where the current shape is triangular in nature with a fixed down-slope. Such converters may include DCM flyback converters and DCM buck converters. The proposed control techniques can reduce body diode conduction of the synchronous rectifier and optimize turn-off timing, while negating the effect of parasitic circuit elements. These techniques may also help simplify the control of synchronous rectifiers operated in parallel mode. Finally, such techniques may also help achieve higher performance in variable output voltage converters and converters that operate at high switching frequencies.

Abstract: A power-supply apparatus includes a power-supply circuit to which an input voltage and an input current are input, to include a switching element to be controlled by a control signal so as to generate an output voltage and an output current, a memory, and a processor coupled to the memory and the processor to calculate a first duty ratio of the control signal so that the output voltage approaches a target voltage, calculate a second duty ratio of the control signal for the switching element, based on the input voltage, the input current, the output voltage, and the output current, detect deterioration of the power-supply circuit, based on the first duty ratio and the second duty ratio, generate the control signal of the first duty ratio when the power-supply circuit has not deteriorated, and generate the control signal for stopping the power-supply circuit when the power-supply circuit has deteriorated.

Abstract: A system includes a switching converter with an output inductor. The switching converter also includes a switch set with a switch node coupled to the output inductor. The switching converter also includes a first drive stage coupled to the switch set. The switching converter also includes a second drive stage coupled to the switch set. The switching converter also includes a controller coupled to the first drive stage and the second drive stage. The controller includes a supply voltage detector circuit. The controller also includes a level shifter coupled to an output of the supply voltage detector circuit. The controller also includes a selection circuit coupled between the level shifter and the second drive stage.

Abstract: The present invention disclosed a bridge rectifier comprising a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit, a first driving circuit, a second driving circuit, a third driving circuit, and a fourth driving circuit. The first driving circuit is electrically connected to the first switching circuit, the second driving circuit is electrically connected to the second switching circuit, the third driving circuit is electrically connected to the third switching circuit, the fourth driving circuit is electrically connected to the fourth switching circuit. In the disclosure, the bridge rectifier should be implemented by the combination of switch circuits with driving circuits. Such that the power dissipation of bridge rectifier could be significantly reduced to improve the function of the overall circuit due to the low impedance of the switching circuit in a closed state.

Abstract: An apparatus for conversion between AC and DC voltages includes a rectifier and first and second stages coupled to each other and having a regulator and a switched-capacitor circuit respectively. The first stage receives a first voltage from the rectifier and the second stage provides a second voltage. A controller controls the first and second stages.

Abstract: An active rectifier bridge circuit and an on-chip integrated system. The active rectifier bridge circuit includes: a bias module, configured to provide a first bias current source, a second bias current source, and an internal power supply for a gate driver module; the gate driver module controlled by the first bias current source, the second bias current source, and the internal power supply, and configured to process one group of alternating current input voltages to generate two groups of control signals that are mutually inverted, to generate four gate drive signals; a power switch tube rectification module, connected to the bias module and the gate driver module, configured to: perform a turn-on or turn-off operation on corresponding power switch tubes under the control of the four gate drive signals, and convert the one group of alternating current input voltages into a direct current output voltage for output.

Abstract: A driving circuit for driving a synchronous rectifier device. The driving circuit may include a controllable clamping circuit having a first terminal coupled to a sensing terminal of the driving circuit, a second terminal coupled to a reference ground terminal of the driving circuit, a third terminal coupled to a driving terminal of the driving circuit, and a control terminal configured to receive a supply indication signal indicative of a voltage potential at a supply terminal of the driving circuit. The third terminal of the controllable clamping circuit may be connected to the second terminal of the controllable clamping circuit when the supply indication signal indicates that the voltage potential at the supply terminal has not been established to maintain the synchronous rectifier device off.

Abstract: One or more embodiments relate to a reference voltage control circuit for a buck-boost converter. According to certain aspects, embodiments can increase or decrease the reference voltage for an error amplifier for controlling a pulse width modulation (PWM) signal when there is a change in the mode of operation. In these and other embodiments, the reference voltage control circuit is configured to modify the reference voltage by increasing or decreasing the reference voltage when there is a change in the mode of operation, so as to reduce overshoot or undershoot disturbances in the regulated output voltage during such transitions.

Abstract: An over-power protection circuit for a MOSFET includes an over-current protection circuit and a current limit setting circuit, and an over-power protection circuit configured to continuously monitor a voltage across the MOSFET being protected to prevent over-power conditions, and to dynamically determine a maximum current limit based on the monitored voltage and a pre-set maximum power limit.

Abstract: Provided is a system of varying a dead time of a converter, including a converter including a plurality of semiconductor switches to which a dead time is applied during an alternate switching operation; and a controller controlling ON/OFF of the plurality of semiconductor switches and setting the dead time, wherein the controller varies the dead time during an operation of the converter. According to the present invention, an over dead-time may be detected and varied to an appropriate dead time, thereby minimizing power loss of the converter and increasing efficiency thereof.

Abstract: A surge protective device (SPD) includes a first electrical terminal, a second electrical terminal, and an overvoltage protection circuit connected between the first and second electrical terminals. The overvoltage protection circuit includes a gas discharge tube and a current management circuit connected in series to the gas discharge tube. The current management circuit includes a varistor and a resistor that are connected in parallel between a first node of the current management circuit and a second node of the current management circuit.

Abstract: A circuit includes a regulation module having a threshold input to receive a clamp threshold voltage and a feedback input to monitor a swing-limited output voltage. The regulation module generates a difference signal that indicates a difference between the clamp threshold voltage and the swing-limited output voltage. A current compensation module includes a clamp port and an input port. The clamp port to controls the swing-limited output voltage and the input port receives the difference signal. The clamp port generates an adjustment current to control the swing-limited output voltage based on the difference signal. An adjustment network receives an input voltage and the adjustment current from the clamp port. The adjustment current to generate a voltage across the adjustment network such that the swing-limited output voltage at the clamp port is adjusted within a voltage range of the input voltage.

Abstract: The present disclosure discloses a voltage regulating apparatus, including a pre-stage circuit and a post-stage circuit. The pre-stage circuit receives an input voltage and outputs an intermediate bus voltage, and the post-stage circuit receives the intermediate bus voltage and outputs an output voltage. The post-stage circuit includes a plurality of post-stage converters, the post-stage converters are connected in parallel in an interleaved manner. In this way, the post-stage circuit has a small inductance, thereby reducing the volume of the apparatus and increasing the power density of the apparatus.

Abstract: A method for locating and clearing phase faults in a micro-grid in off-mode. The method includes determining a surveillance area of a microgrid having at least two busbars to monitor; determining all source feeders and load feeders of the surveillance area; acquiring measurement data comprising current magnitude for all source feeders and load feeders; and monitoring the at least two busbars in the surveillance area for a voltage dip in one of phase-to-phase or phase-to-neutral voltages. The method further includes, on detecting a voltage dip on the monitored busbars, determining a defect phase having a minimum phase-to-neutral voltage; and performing current analysis for the defect phase.

Abstract: Current source rectifier (CSR) systems and methods for a power source including three phase lines are disclosed. One illustrative CSR system includes a rectifier operable to receive an AC input voltage and provide a DC output voltage and a controller communicatively coupled to the rectifier. The rectifier comprises first, second, and third phase legs including a plurality of switches with each switch coupled to an associated phase line of the three phase lines. The controller is operable to (i) control operation of the plurality of switches in accordance with a first switching sequence when measured input voltages on at least two phase lines of the three phase lines are outside of the predetermined voltage range and (ii) control operation of the plurality of switches in accordance with a second switching sequence when the measured input voltages on the at least two phase lines are within the predetermined voltage range.