Abstract: The present invention provides an auxiliary pre-charging device for a power converter. The power converter includes at least one power unit with an input end being connected to a medium and high voltage AC power source, and an output end being connected to a low voltage DC bus, wherein the auxiliary pre-charging device includes a switch, a transformer, a pre-charging resistor, and a rectifier sequentially connected in series, one end of the switch is connected to the medium and high voltage AC power source, and an output end of the rectifier is connected to the low voltage DC bus. The present invention also provides a pre-charging method for a power converter, which uses the aforementioned auxiliary pre-charging device to start pre-charging at the low-voltage output end of the power converter.

Abstract: A buck-boost switching regulator includes: a power switch circuit including an input switch unit and an output switch unit; a bypass control circuit configured to operably generate a bypass control signal according to a conversion voltage difference between an input voltage of an input power and an output voltage of an output power and according to whether an inductor current flowing through an inductor reaches an output current of the output power; and a bypass switch circuit, wherein when the conversion voltage difference is below a reference voltage and when the inductor current flowing through the inductor reaches the output current, the bypass control signal controls the bypass switch circuit to electrically connect the input power with the output power, so that the buck-boost switching regulator operates in a bypass mode.

Abstract: A voltage generated in a DC line at the time when a sub module is deactivated in the event of a short-circuiting fault in the DC line is suppressed. A power conversion system includes a power converter including a leg circuit, a control device, and a voltage suppression circuit connected to a DC line. The leg circuit includes a plurality of sub modules connected in series, and at least one of them is a first sub module implemented by a sub module in a full-bridge configuration or a 1.5 half-bridge configuration. When the control device detects a short-circuiting fault in the DC line, it stops a switching operation of the plurality of sub modules. The voltage suppression circuit is configured to suppress a voltage generated in the DC line when the switching operation is stopped.

Abstract: In a power feeding control device, N-channel first FET and second FET are located in a current path for current flowing from a positive terminal to a negative terminal. The drain of the first FET is located downstream of the source. The drain of the second FET is located upstream of the source. The cathode of a first diode is connected to the negative terminal. A first drive circuit and a second drive circuit switch ON or OFF the first FET and the second FET by adjusting the gates of the first FET and the second FET, with respect to the cathode of the first diode.

Abstract: A controller of a switching converter having a switch and an energy storage component. The controller has a hysteresis feedback circuit for generating a hysteresis feedback signal based on an output feedback signal of the switching converter, a first comparison circuit for generating a first comparison signal by comparing the hysteresis feedback signal with a ramp signal, a second comparison circuit for generating a second comparison signal by comparing the output feedback signal with the ramp signal, and a turn-on control circuit. The turn-on control circuit generates a target locked valley number based on a valley pulse signal in response to one or more valleys of a voltage drop across the switch, the first comparison signal, the second comparison signal and a current locked valley number, and further generates a turning on control signal corresponding to the target locked valley number for turning ON the switch.

Abstract: An active snubber circuit is connected to a buck converter and decreases a first surge voltage and a second surge voltage generated by the buck converter. The active snubber circuit includes a first FET switch connected to the output point of the first surge voltage and a first power storage element, a second FET switch connected to the output point of the second surge voltage and a second power storage element, an inductor connected to a connection point positioned on an output side with respect to the output point of the second surge voltage, the first and second FET switches, and an element connected to the first and second FET switches, the inductor, and ground and through which a forward current flows.

Abstract: A converter system includes a reference buffer buffering a reference input to produce a DAC reference, operating from a reference feedback voltage generated by a reference divider. A tail buffer generates a tail voltage from an input voltage generated from the DAC reference by a tail divider. An R-2R type DAC utilizes an R-2R ladder to generate a DAC output from a code. This ladder has a tail resistor coupled to the tail voltage. A feedback buffer buffers the DAC output to produce a converter reference. A DC-DC converter generates a DC output from a DC input, based upon a converter feedback voltage. A feedback divider coupled between the DC output and the converter reference generates the converter feedback voltage. Control circuitry selectively taps the reference divider to produce the reference feedback voltage (performing gain trimming) and selectively taps the tail divider to produce the input voltage (performing offset trimming).

Abstract: A buck-boost converter for converting an input voltage at an input node into an output voltage at an output node, the converter comprising: first and second inductor nodes for connection of an inductor therebetween; a first converter stage coupled between the input node and the first inductor node; and a second converter stage coupled between the second inductor node and the output node, wherein one or more of the first converter stage and the second converter stage comprises a switching network, comprising: a first switch for selectively connecting a first flying capacitor node to a stage input node; a second switch for selectively connecting the first flying capacitor node to a stage output node; a third switch for selectively connecting a second flying capacitor node to the stage output node; and a fourth switch for selectively connecting the second flying capacitor node to a reference voltage, the first and second flying capacitor nodes for connection of a flying capacitor therebetween.

Abstract: For power transfer from a first DC part to a second DC part in a dual active bridge (DAB) converter by stepping down a voltage, a first bridge circuit includes a period in which the first DC part and a primary winding of an insulated transformer conduct and a period in which ends of a primary winding of the insulated transformer are short-circuited in the first bridge circuit. A second bridge circuit includes a rectification period. A control circuit variably controls a phase difference between a first leg a the second leg, variably controls a simultaneous off period of a fifth switching element and a sixth switching element, and variably controls a simultaneous off period of a seventh switching element and an eighth switching element.

Abstract: The present disclosure describes a circuit having a current source and a load circuit coupled to the current source. The current source can include a transistor electrically coupled to a voltage supply and can be configured to generate a first current with a first current rate-of-change during a time interval, where the first current can be a cancellation current. In addition, the load circuit can be configured to generate a second current with a second current rate-of-change during the same time interval, where the second current can be a load current. The second current rate-of-change can be substantially an inverse of the first current rate-of-change. A power system can include a power management unit configured to generate a power supply voltage at an output, a current source and a load circuit electrically coupled to the output, and a control circuit controls the first current rate-of-change during the time interval.

Abstract: The invention relates to a DC voltage converter for transferring power from a high voltage network to a low voltage network. As a result, a circuit configuration which can be operated alternatively as an active-clamp flyback converter or an active-clamp buck converter is used.

Abstract: A method of operating a transport refrigeration system having a plurality of inverters configured to power a refrigeration unit includes placing a first inverter of the plurality of inverters in an active state; monitoring a load on the first inverter; comparing the load on the first inverter to an upper threshold; placing a second inverter of the plurality of inverters in an active state upon the load on the first inverter being greater than the upper threshold.

Abstract: A method for controlling a voltage converter includes the following steps. A feedback compensation signal is generated based on an output voltage of the voltage converter. An output representation signal is compared with a first threshold and a second threshold. A switch control signal to control the turn-on and turn-off of a power circuit of the voltage converter is adjusted based on an ultra-light load feedback value when the output representation signal is less than the first power threshold. The switch control signal is adjusted based on the feedback compensation signal when the output representation signal is greater than the first power threshold. The second threshold is greater than the first threshold, and the ultra-light load feedback value is greater than the feedback compensation signal when the output representation signal is equal to the second threshold.

Abstract: A first switch couples an input node receiving a main control signal for a main switching stage of a multi-phase converter to an output node delivering a secondary control signal for a secondary switching stage following actuation of the secondary switching stage. A second switch couples the output node to a capacitor during a time period of actuation/deactuation of the secondary switching stage. Current is sourced to the capacitor during the actuation time period or sunk from the capacitor during the deactuation time period. The sourced or sunk current may be generated proportional to the main control signal.

Abstract: Disclosed are a high-efficiency integrated power circuit with a reduced number of semiconductor elements and a control method thereof. A high-efficiency integrated power circuit of an integrated converter includes an input port, which is a first port, to which power for driving the integrated converter is input, a non-isolated port, which is a second port, for outputting, to outside the high-efficiency integrated power circuit, an allowable amount of power generated when power input through the input port passes through an inductor, and an isolated port, which is a third port, for conducing remaining power excepting power output through the non-isolated port and for maintaining the conducted remaining power inside the high-efficiency integrated power circuit.

Abstract: A chain-link converter includes a number of series-connected chain-link modules. Each chain-link module has a module controller that is programmed to control operation of the corresponding chain-link module to selectively provide a voltage source, whereby the chain-link converter is able to provide a stepped variable voltage source. The chain-link converter also includes a chain-link converter controller that is arranged in communication with each module controller, and which is programmed to, in-use, communicate to a number of the module controllers a measured converter current (IDC) that is flowing through the chain-link converter. The module controllers that receive the measured converter current (IDC) is each further programmed, in-use, to combine the measured converter current (IDC) with a measured rate of change of current (IAC) flowing through the corresponding chain-link module, to establish an instantaneous module current (Ii) that is flowing through the corresponding chain-link module.

Abstract: According to various embodiments, a power converter circuit is disclosed. The power converter circuit includes a plurality of voltage splitting units (VSUs) coupled to a plurality of current splitting units (CSUs). The VSUs are connected to each other in series and the CSUs are connected to each other in parallel. The VSUs each have a fixed voltage conversion ratio and are operated at a lower frequency than the CSUs. The CSUs each have an adjustable voltage conversion ratio and are operated at a higher frequency than the VSUs.

Abstract: Embodiments of a power stage for a direct current (DC)-DC converter and a DC-DC converter are disclosed. In an embodiment, a power stage for a DC-DC converter includes an input terminal from which input power of the DC-DC converter with an input DC voltage is received, a high-side segment connected between the input DC voltage and an output signal of the power stage, and a low-side segment connected between the output signal of the power stage and ground. At least one of the high-side segment and the low-side segment includes stacked transistors having isolation terminals that are biased to reduce substrate injection.

Abstract: A switched capacitor converter can include a plurality of input switch groups connected in series between an input terminal and an output terminal, where each input switch group can include two power switches connected in series. The switched capacitor converter can also include a plurality of output switch groups, where each output switch group can include two power switches connected in series. The switched capacitor converter can also include a plurality of capacitors, first terminals of which are respectively connected to the common nodes of every two series-connected power switches in the plurality of input switch groups, and second terminals of which are respectively connected to intermediate nodes of each output switch group. The switched capacitor converter can also include a plurality of inductors, where a first terminal of each output switch group can connect to a first terminal of a corresponding inductor.

Abstract: A method for controlling an inverter-based resource (IBR) connected to a power grid during a grid event includes operating the IBR based on a first virtual impedance reference prior to the grid event, the first virtual impedance reference being used for determining a first virtual impedance of the IBR defining a first virtual reactance and a first virtual resistance. The method also includes receiving an indication of a start of the grid event that causes a change in the first virtual impedance reference to a second virtual impedance reference. Immediately after the change in the first virtual impedance reference, the method includes activating a soft activation module for outputting a second virtual impedance defining a second virtual reactance and a second virtual resistance that maintains a magnitude of the second virtual impedance at or above a magnitude of the second virtual impedance reference so as to reduce current in the inverter-based resource.