A wide input voltage range power converter circuit in a one-stage-two-switch configuration has a power input terminal, a switch node connected to the power input terminal, a transformer, two electronic switches, a pulse width modulation (PWM) circuit, and an output circuit. An input side of the transformer has a first winding and a second winding that are connected to the switch node. An output side of the transformer has an output winding. A turns ratio between the first winding and the output winding is different from a turns ratio between the second winding and the output winding. The two electronic switches are respectively connected to the first winding and the second winding in series. The PWM circuit is connected to the power input terminal and control terminals of the two electronic switches. The output circuit is connected to the output winding.

The present disclosure relates to a driving control circuit, method and device for a gallium nitride (GaN) transistor, and a medium. An ADriver pin and an electronic switch are added to an existing flyback power supply circuit. The electronic switch includes a first terminal connected to the ADriver pin, a second terminal connected between a driving resistor and a GaN transistor, and a third terminal connected between a current detection resistor and a current sense pin. By improving the driving control circuit and the driving control method for the GaN transistor, the present disclosure can effectively prevent the false turn-on problem due to high-frequency oscillation between the leakage inductance of the transformer and the parasitic capacitance after the GaN transistor is turned off, and drives the GaN transistor more reliably.

A power supply circuit for a switching mode power supply, having: a charging capacitor coupled to an auxiliary winding; a power supply diode coupled to a power supply capacitor, wherein the charging capacitor has a connecting terminal coupled to the power supply diode, and the charging capacitor and the power supply diode are serially coupled between the auxiliary winding of the switching mode power supply and the power supply capacitor; and a power supply switch coupled between the connecting terminal and a primary ground of the switching mode power supply.

A multi-port converter includes a hybrid energy storage system (HESS) that provides a faster dynamic response to load changes than prior art systems, and enables either downsizing of the main energy storage system (ESS) to increase the life of the main ESS (e.g. energy battery), or retaining the same size ESS and increasing the range or life of the power source. The multi-port convertor can advantageously result in lower investment and maintenance costs, and can also advantageously provide a path for inputs to directly feed the load. All these benefits can be achieved while reducing the number of active switches and overall component count as compared to prior art systems.

A snubber circuit according to an embodiment of the present invention, which is connected to a secondary side switch of a transformer, comprises: a diode connected to an input terminal of the secondary side switch; a capacitor connected to an output terminal of the diode; a resistor connected in parallel with the capacitor; and a snubber switch for connecting the resistor and ground.

EMI noise is reduced and a component mounting area is suppressed, and downsizing of a power supply device is achieved. Power supply device includes transistor block, gate drive circuit block, and driver block. First gate terminal and second gate terminal are disposed on the same side as gate drive circuit block when viewed from a center of transistor block. Two output terminals are disposed on the same side as transistor block when viewed from a center of gate drive circuit block. At least a part of first drain terminal is included in a region sandwiched between first source terminal and second source terminal. Second drain terminal is disposed at a position deviating from an extension region that extends the region sandwiched between the first source terminal and the second source terminal beyond second source terminal as viewed from first drain terminal.

A power converter configured to be connected to three or more voltage parts, includes three or more power-conversion circuitries to be connected to respective ones of the three or more voltage parts, and a multi-port transformer connected to the three or more power-conversion circuitries at respectively different ports. The three or more voltage parts include a vehicle drive battery and a plurality of alternating-current (AC) voltage parts. Each of the plurality of AC voltage parts is configured to provide at least one of power input to a multi-port transformer side and power output from the multi-port transformer side.

Disclosed are a power circuit and an automated external defibrillator including the same. The power circuit may include a battery-driven power source, and a transformer comprising a primary winding and N secondary windings, wherein N is an integer greater than or equal to 2, and wherein the primary winding is electrically coupled to the power source. The power circuit may include N charging and discharging branches, wherein the N charging and discharging branches are respectively connected to the N secondary windings and are cascaded in sequence. The power circuit may include a plurality of electrode plates configured to be connected to an external load, wherein electrode plates of the plurality of electrode plates are electrically coupled to one or more output nodes of the N charging and discharging branches.

Disclosed herein is a charger capable of bidirectional power transfer. A power factor compensation circuit converts a multi-phase AC voltage into a DC voltage and includes a plurality of inductors and a plurality of switching elements. The DC voltage converted by the power factor compensation circuit is applied to a DC link capacitor. A bidirectional DC converter bidirectionally converts the magnitude of a voltage between the DC link capacitor and a battery. In DC power supply mode, a controller controls the bidirectional DC converter to convert a magnitude of a voltage of the battery to apply the voltage of the battery to the DC link capacitor and controls the plurality of switching elements to generate a DC supply voltage by converting the magnitude of the DC voltage of the DC link capacitor and output the DC supply voltage through a terminal through which the multi-phase AC voltage is input.

An embodiment charging device includes a power factor correction circuit first to third switch legs connected to first to third inductors, respectively, a relay network for controlling connection between the first to third inductors and first to third input terminals according to a phase of a power grid connected to the first to third input terminals, a relay control circuit connected to the first to third input terminals for sensing one of the first to third input terminals to which a power source is connected and controlling the relay network based on a sensing result, and a relay filter circuit including first to third filter capacitors connected between a ground plane and first to third sensing lines connected to the relay control circuit for sensing voltages of the first to third input terminals and a fourth filter capacitor connected between the ground plane and a chassis.