Abstract: An isolated DC/DC converter includes a transformer having a first winding and a secondary winding, a switching transistor connected to the primary winding of the transformer, a rectifier element connected to the secondary winding of the transformer, a photocoupler, a feedback circuit configured to drive a light emitting element on an input side of the photocoupler by a forward current corresponding to an error between an output voltage of the DC/DC converter and a target voltage of the DC/DC converter, a conversion circuit configured to convert a collector current flowing in a light receiving element on an output side of the photocoupler into a feedback voltage having a negative correlation with the collector current, a pulse signal generator configured to generate a pulse signal corresponding to the feedback voltage, and a driver configured to drive the switching transistor depending on the pulse signal.

Abstract: A circuit has a variable output that changes an output of a fixed input inversion amplification circuit, which includes a first operation amplifier with one input terminal that is applied with a fixed input value. The circuit includes an intermediate inversion amplification circuit having a second operation amplifier with an output terminal that is connected to another input terminal of the operation amplifier included in the fixed input inversion amplification circuit. One input terminal of the second operation amplifier is applied with the same input value as the fixed input value applied to the one input terminal of the first operation amplifier. Another input terminal of the second operation amplifier is applied with a variable input corresponding to an output of the first operation amplifier.

Abstract: According to the overload current limiting method for a voltage source converter, when a pole control system receives a water-cooling overload current limiting instruction, an active and reactive instruction are changed at the same time according to a specified slope, so that an absolute value of an arm current of the converter decreases in a fixed slope, and can be ensured that active power and reactive power fall to zero at the same time, and a water-cooling load limiting aim of the converter can be achieved by reducing the arm current. After a water-cooling overload power limiting instruction received by the pole control system is cancelled, a current value of the active power and the inactive power remain unchanged. When a water-cooling overload power limiting instruction is received again, decrease continues on the basis of current power values until the power falls to zero.

Abstract: An example two-path symmetrical-output adjustable power supply is provided, including a switching power supply module, a positive adjustment module, a negative adjustment module and a first operational amplifier. The switching power supply module is coupled to a DC power supply and the first operational amplifier and configured to output a positive voltage and a negative voltage in common-ground and equal in absolute value according to a feedback control based on a reference voltage and the output voltage of the first operational amplifier. The positive adjustment module is coupled to the positive voltage and configured to output a positive output voltage of the adjustable power supply according to a feedback control based on a given voltage and the positive output voltage. The negative adjustment module is coupled to the negative voltage and configured to output a negative output voltage of the adjustable power supply according to the positive output voltage.

Abstract: System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes an operation-mode-selection component and a driving component. The operation-mode-selection component is configured to receive a first signal related to an output load of the power conversion system and a second signal related to an input signal received by the power conversion system and output a mode-selection signal based on at least information associated with the first signal and the second signal. The driving component is configured to receive the mode-selection signal and generate a drive signal based on at least information associated with the mode-selection signal, the driving signal corresponding to a switching frequency.

Abstract: A switching converter having an input for receiving an input voltage, an output for supplying an output voltage, and a converter device which includes an inductance, a capacitance, a diode and a switching device developed as a current source, for converting the input voltage into the output voltage.

Abstract: A controller may include a memory having computer-readable instructions stored therein; and a processor configured to execute the computer-readable instructions to generate Pulse Width Modulation (PWM) signals to control power switches of an Active Front End (AFE) inverter based on at least a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid without using physical voltage sensors at the terminal of the AC grid, and control the AFE inverter to supply power to a load based on the PWM signals.

Abstract: One or more embodiments of the present disclosure may include a method of power regulation. The method may include determining a peak voltage level on a primary winding of a transformer. The method may also include selecting a particular coarse current level window based on the determined current level. Wherein the particular coarse current level window is one of a plurality of coarse current level windows. The method may additionally include determining a low window value based on the particular coarse current level window. The method may include generating a reference voltage based on the low window value. The method may also include generating a control signal based on the reference voltage. The method may additionally include transmitting the control signal to a switch circuit coupled to the primary winding of the transformer to adjust the current level on the primary winding of the transformer.

Abstract: A power converter with average current detection and the corresponding detecting method and detecting circuit are disclosed. The average current detecting circuit has an average voltage detecting circuit and a voltage-current converting circuit. The average voltage detecting circuit generates a voltage across a detecting resistor by letting an inductor current flowing through an output inductor of the power converter flowing through the detecting resistor. Further, the average voltage detecting circuit samples the voltage across the detecting resistor when a switch of the power converter transits from an on state into an off state and the opposite and then calculates the average value of the two sampled voltages. The voltage-current converting circuit converts the average value into an average current by multiplying the average value by a scaling factor.

Abstract: A single-phase DC/AC inverter has a single-phase inverter bridge with binary switches connected to an RLC low-pass filter. Digital control logic in a control circuit (or in a microcontroller) determines and controls a logic state q determining the position of the switches in the inverter bridge from sensed iL, vC values from the RLC filter. The control logic selects one of multiple possible logic states q based on whether the sensed iL, vC values belongs one of multiple boundary regions of a tracking band in an iL, vC state space.

Abstract: A vehicle includes a power converter having an inductor electrically disposed between a traction battery and an electric machine. The vehicle includes a controller configured to reduce a power limit of the power converter. The reduction is responsive to an increase of a ratio of voltage across the inductor to a rate of change of current through the inductor.

Abstract: This disclosure relates to power converters capable of providing multiple output voltage levels. With respect to USB-C adapter design, the converter's output may need to be changed between different voltage levels, e.g., a low voltage (such as 5V, 10V), an intermediate voltage (such as 12V, 20V), or a high voltage (such as 20V, 40V)—based on the charging device's request. By using a tapped-winding transformer, the turns-ratio of a flyback transformer may be intelligently selected for high output voltage ranges, thus enabling the duty cycle to be kept the same for the low and intermediate voltage output levels. The flyback converter would then only need to accommodate the intermediate and high output voltages. For high output voltages, a switch may be activated to put the two windings of the transformer in series; for lower output voltages, the switch may be turned off, such that only one winding is used.

Abstract: A circuit includes a zero current detector (ZCD) circuit that senses an inductor current of an inductor and generates signal pulses indicating when an increasing cycle of the inductor current crosses a predetermined current value and when a decreasing cycle of the inductor current crosses the predetermined current value. A sync control provides a control signal specifying one of the signal pulses corresponding to the increasing or decreasing cycle of the inductor current. A sync selector circuit generates a sync pulse representing the signal pulse from the ZCD in response to the control signal. The sync pulse triggers a timing adjustment for a switch device.

Abstract: In some examples, a controller device is configured to control power electronics circuitry and includes a high-voltage (HV) pin, a power supply (VCC) pin, a startup device configured to conduct electricity from the HV pin to the VCC pin, and comparator circuitry configured to determine whether a voltage level of the VCC pin is greater than a turn-on voltage threshold. In some examples, the comparator circuitry is further configured to cause the controller device to enter a normal-operation mode in response to determining that the voltage level of the VCC pin is greater than the turn-on voltage threshold. In some examples, the controller device also includes level detection circuitry configured to determine the turn-on voltage threshold based on a level of the HV pin.

Abstract: A power conversion apparatus includes: a power converter that includes a plurality of switching elements; and a controller that controls the plurality of switching elements. The controller includes: a command generator that generates a voltage command vector; a synthesizer that synthesizes a correction vector with the voltage command vector to generate a synthetic vector; an adjuster that adjusts an output time of a plurality of voltage vectors from the power converter, the output time being corresponding to the synthetic vector; and a correction vector generator that generates the correction vector on the basis of an adjustment result of the adjuster.

Abstract: A bandgap reference circuit includes a voltage generation circuit, a capacitor and a clamping control circuit. The voltage generation circuit is used to generate a current on an operation terminal. The capacitor includes a first terminal coupled to the operation terminal, and a second terminal coupled to a first reference voltage terminal. The clamping control circuit is coupled between the operation terminal and a second reference voltage terminal. The clamping control circuit includes a switch and a clamping unit, and is used to allow part of the current flowing through the clamping unit to the second reference voltage terminal when the switch is turned on.

Abstract: In one embodiment, a control circuit may be configured to form a switching signal to switch a power transistor at a frequency to regulate an output voltage of the power supply to a target value wherein the control circuit is configured to operate in a normal operating mode and a start-up mode and wherein the control circuit is configured to switch the switching signal at a target frequency in response to operating in the normal operating mode. A first circuit may be configured to control the frequency of the switching signal to increase from a first frequency to a second frequency that is less than the target frequency in response to operating in the start-up mode.

Abstract: Disclosed is a managing device for cooling an inverter. The managing device for cooling an inverter includes a fan controller configured to provide an electric current flowing in a cooling fan; and a controller configured to determine whether the current flowing in the cooling fan is out of a preset range, and, when the current is out of the preset range, configured to control the cooling fan with a control voltage different from an operating voltage of the cooling fan.

Abstract: Power conversion devices with control algorithms that can solve the double frequency harmonic problem are provided, as are techniques for controlling power converters when the instantaneous values of input and output power are not the same.

Abstract: Various methods and devices that involve pulsed signals are disclosed. An example minimum pulse-width (MPW) circuit comprises a first and second logic circuit. A first input of the first logic circuit is connected to an input of the MPW circuit. A first input of the second logic circuit is communicatively coupled to an output of the first logic circuit. The MPW circuit also comprises a MPW filter circuit communicatively coupled to an output of the second logic circuit, a one-shot circuit communicatively coupled to an output of the minimum pulse-width filter circuit and located on a first feedback path, and another one-shot circuit communicatively coupled to the output of the minimum pulse-width filter circuit and located on a second feedback path. A second input of the first logic circuit is on the first feedback path. A second input of the second logic circuit is on the second feedback path.