Abstract: A voltage regulator includes an operational amplifier that compares a feedback voltage that is proportional to an output voltage and a predetermined reference voltage that corresponds to a desired output voltage. The operational amplifier controls the conduction state of an output transistor according to the comparison. A detecting circuit monitors the operating state of the operational amplifier, and in the case that the operational amplifier is not operating, outputs a signal which causes the output transistor to be placed in a non-conductive state.

Abstract: A modulator for a flying-capacitor type multilevel converter receives, at an input, a time-variant reference signal and provides, at an output, a sequence of target levels, to provide switching signals for switching between discrete output levels of the multilevel converter according to the shape of the reference signal. The modulator determines a critical level as an intermediate output level of the multilevel converter which is closest to the level of the reference signal; and outputs only target levels corresponding to output levels different from the critical level.

Abstract: This disclosure provides a control method for multi-phase switching converter having a master phase and at least one slave phase. The control method comprises: providing a pulse signal with 0.5 duty cycle by frequency-dividing a master control signal supplied to the master phase; and for each slave phase to be enabled, setting a ratio of a charge current and a discharge current based on a slave phase number under a phase-added operation, charging a first capacitor with the charge current and discharging a second capacitor with the discharge current in high logic of the pulse signal, discharging the first capacitor with the discharge current and charging the second capacitor with the charge current in logic low of the pulse signal, and generating a respective enable signal for controlling a switch in a corresponding slave phase by comparing a first capacitor voltage with a second capacitor voltage.

Abstract: A power converter controller includes an analog to digital converter (ADC) to generate a digital representation of a feedback signal of a power converter, the feedback signal being received from a compensator of the power converter and being based on an output voltage of the power converter. A nonlinear gain block of the power converter controller receives the digital representation of the feedback signal and generates a transformed digital representation of the feedback signal using a nonlinear function. A switch control block of the power converter controller controls an on-time of a primary-side switch of the power converter based on the transformed digital representation of the feedback signal.

Abstract: An integrated circuit for a power supply circuit that includes a transistor and generates an output voltage of a target level. The integrated circuit is configured to switch the transistor. The integrated circuit includes a first terminal configured to receive a feedback voltage according to the output voltage, a signal detection circuit configured to detect, through the first terminal, a setting signal received from an external circuit that operates based on the output voltage, and a driver circuit configured to drive the transistor in response to the setting signal detected by the signal detection circuit.

Abstract: In a control circuit for a power converter applicable to a system including a rotary electric machine, a fail-safe controller performs, in response to determination that there is a failure in the system, a short-circuit control routine that turns on predetermined turn-on arm switches, and turns off predetermined turn-off arm switches. The turn-on arm switches bare one of (i) upper-arm switches and (ii) lower-arm switches, and the turn-off arm switches are the other of (i) the upper-arm switches and (ii) the lower-arm switches. An on determiner detects a drive state of each turn-on arm switch upon determination that the turn-on is instructed for the corresponding turn-on arm switch, and determines, based on the drive state of each turn-on arm switch, whether the turn-on arm switches are switchable to be on in preparation for a short-circuit control routine performed by a short-circuit controller.

Abstract: A first node of converter circuit receives an input, provides an output at a second node, and has a third node coupled by an inductance to ground. A first switch has a current path between the first and third nodes and a second switch has a current path between the third and second nodes. The converter circuit operates in a first state (with the first switch conductive and the second switch non-conductive) and a second state (with the first switch non-conductive and the second switch conductive). Current flowing through the first switch is sensed during the first state to produce a sensing signal indicative of inductance current. The sensing signal is averaged to produce an averaged sensing signal indicative of an average value of the current. The averaged sensing signal is then weighted by a time during which the second switch is conductive to produce a weighted signal.

Abstract: An embodiment voltage converter includes a first transistor connected between a first node of the converter and a second node configured to receive a power supply voltage, a second transistor connected between the first node and a third node configured to receive a reference potential, a first circuit configured to control the first and second transistors, and a comparator configured to compare a first voltage with a threshold, the first voltage being equal, during a first period, to a first increasing ramp and, during a second period, to a second decreasing ramp, the threshold having a first value during the first period and a second value during the second period, the first and second values being variable.

Abstract: A distributed power system wherein a plurality of power converters are connected in parallel and share the power conversion load according to a prescribed function, but each power converter autonomously determines its share of power conversion. Each power converter operates according to its own power conversion formula/function, such that overall the parallel-connected converters share the power conversion load in a predetermined manner.

Abstract: A control unit is provided with a step-down unit which causes a system voltage of each phase of a system to step down, a voltage pulse signal generation unit which generates a voltage pulse signal of each phase that was stepped down by the step-down unit, a current pulse signal generation unit which generates a current pulse signal of each phase of the system, a zero crossing point detection unit which outputs time information of a zero crossing point of the system voltage and the system current of each phase based on the voltage pulse signal and the current pulse signal of each phase of the system, and an arithmetic unit which calculates, respectively, a value of active power and a value of reactive power of AC power output by the power conditioner to the system based on the time information of the zero crossing point of the system voltage and the system current of each phase of the system provided from the zero crossing point detection unit, and thereby controls the power conditioner.

Abstract: A semiconductor device includes an inverter circuit having a first switching element and a second switching element, a first control circuit, a second control circuit, and a limiting unit. The first switching element is supplied with a power supply voltage. The second switching element includes a first terminal connected to the first switching element, a second terminal connected to ground, and a control terminal. The first control circuit controls the first switching element. The second control circuit controls the second switching element. The limiting unit reduces fluctuation in voltage between the second terminal and the control terminal based on voltage fluctuation at the second terminal of the second switching element.

Abstract: A method of clamping an output current of a three-phase power converter is provided. The three-phase power converter includes three switching bridge arms and provides a three-phase output voltage command, and each switching bridge arm has an upper switch and a lower switch connected in series. The method includes steps of: determining that the output current is greater than a first current threshold to activate a current clamping control procedure, comparing a carrier signal with the three-phase output voltage command to turn on the lower switches by a first zero vector when the carrier signal is rising and turn on the upper switches by a second zero vector when the carrier signal is falling, determining that the output current is greater than a second current threshold to activate an overcurrent protection procedure, wherein the second current threshold is greater than the first current threshold.

Abstract: A synchronous rectification control circuit has a turn-on detection circuit. The turn-on detection circuit has a slope detection circuit and a threshold generation circuit. The slope detection circuit generates a slope representation signal representing a falling slope of the detection signal. The threshold generation circuit generates a threshold signal by selecting one of threshold reference signals according to a driving signal. The turn-on detection circuit generates a comparison result signal by comparing the slope representation signal and the threshold signal for controlling the switch state of the synchronous rectification transistor.

Abstract: A switching regulator converts an AC input voltage into an output voltage, to power a load. The switching regulator includes a power stage having a main power switch. The main power switch has different ON time durations under different AC input voltage conditions and different load currents.

Abstract: A zero-crossing correction circuit for a switching converter having a main power switch and a synchronous power switch connected in series, can include: a detection circuit configured to detect an on-off state of a body diode of the synchronous power switch in a first time interval after the synchronous power switch is turned off and generate a detection signal; and a control and adjustment circuit configured to adjust a turn-off moment of the synchronous power switch according to an on-off state of the main power switch in a second time interval after the synchronous power switch is turned off and the detection signal.

Abstract: A drive controller is used in a control system of a power factor correction (PFC) circuit. The control system further includes the PFC circuit. The PFC circuit includes a first bridge arm, a second bridge arm, a first switching transistor, and a second switching transistor. The driving controller includes a sampling circuit and a driving circuit. The sampling circuit is configured to obtain a target current value between the first switching transistor and the second switching transistor. The drive circuit is configured to turn off gate inputs of the first switching transistor and the second switching transistor when the target current value is greater than a current threshold, to turn off the first switching transistor and the second switching transistor and protect the control system.

Abstract: A control circuit for controlling a stackable multiphase power converter includes: a synchronization terminal; a synchronization signal connected to the synchronization terminals of a plurality of the control circuits in parallel, wherein the synchronization signal includes a plurality of pulses to be successively counted as a count number; and a reset signal, configured to reset and initiate the count number; wherein the control circuit further comprises a phase-sequence number, wherein the control circuit enables a corresponding power stage circuit to generate a phase of the output power when the count number reaches the phase-sequence number.

Abstract: Disclosed are an overcurrent protection device and a power conversion device using same. A power conversion device according to an embodiment of the present disclosure comprises: a control unit for providing a collector-emitter voltage to a switching element by means of a first output node; and an overcurrent protection circuit connected in a line between the first output node and the switching element and for limiting the overcurrent of the switching element.

Abstract: A method for controlling a distributed power conversion system comprises: configuring N control units for controlling N power modules of the system respectively, wherein each of the control units is configured to execute: step S1, generating a first variable Q1 reflecting respective module serial numbers R according to a coordination variable; step S2, generating a second variable Q2 reflecting the optimal operating number M of the modules; and step S3, comparing the first variable Q1 and the second variable Q2, wherein, when the first variable Q1 is greater than the second variable Q2, the corresponding power module stops; and when the first variable Q1 is less than or equal to the second variable Q2, the corresponding power module runs.

Abstract: Provided is a power conversion device that achieves both downsizing and improvement in cooling efficiency to have improved reliability. The power conversion device includes a power conversion circuit unit which converts DC power into AC power, a flow path including body for letting a refrigerant for cooling the power conversion circuit unit flow, a filter circuit unit which suppresses electric noise from a wire for transmitting the DC power, and a filter case portion which houses the filter circuit unit, where the filter case portion is formed integrally with the flow path including body, and a gap between the filter case portion and the filter circuit unit is filled with a first resin.