A driving circuit including a reference voltage generator to generate a reference voltage based on an operating frequency of a complementary circuit; a comparator including a first input configured to receive a drain-to-source voltage of a field effect transistor; and a second input to receive the reference voltage; and a signal generator to deliver a driving signal to a gate terminal of the field effect transistor to drive the field effect transistor to an ON state after the drain-to-source voltage of the first low side field effect transistor becomes less than the reference voltage and to an OFF state after the drain-to-source voltage of the field effect transistor becomes greater than the reference voltage.

A power converter includes N power conversion units. Each power conversion unit includes a main switching circuit, a transformer, a synchronous rectifier circuit, an input signal terminal and a signal processor. A primary winding of the transformer is connected with the main switching circuit. The synchronous rectifier circuit is connected with a secondary winding of the transformer. The input signal terminal receives a first PWM control signal. The signal processor generates first and second PWM driving signals to drive the main switching circuit according to the first PWM control signal, and a phase difference between the first and second PWM driving signals is (180±θ) degree. The signal processor generates third and fourth PWM driving signals to drive the synchronous rectifier circuit according to the first PWM control signal, and a phase difference between the third and fourth PWM driving signals is (180±θ) degree.

A microinverter is provided herein and comprises DC side MOSFETs connected to an input side of the microinverter, AC side MOSFETs connected to an output of the microinverter, and a plurality of gate drivers connected to the AC side MOSFETs and configured to automatically drive the microinverter without a DC voltage being applied to the input side of the microinverter.

A power conversion module includes an input port, an output port, a full-bridge switching circuit, a magnetic device, an energy storage capacitor set and a rectifier circuit. The magnetic device includes a first coupled winding pair and a second coupled winding pair. The first coupled winding pair includes a first winding and a second winding, which are coupled to each other. The second coupled winding pair includes a third winding and a fourth winding, which are coupled to each other. The first winding and the third winding are connected between a first bridge arm and a second bridge arm of the full-bridge switching circuit. The energy storage capacitor set is electrically connected with the input port, and electrically connected with the first winding and the third winding. The rectifier circuit is electrically connected with the second winding, the fourth winding and the output port.

Multi-port power adapters. At least one example is a method including: supplying a first bus voltage to a first device by way of a DC-DC converter coupled to a link voltage; supplying a second bus voltage to a second device by way of a second DC-DC converter coupled to the link voltage; converting an AC voltage to the link voltage by way of an AC-DC converter; selecting, by a shunt regulator, a setpoint for the link voltage based on the first bus voltage and the second bus voltage; and regulating the link voltage to the setpoint by the AC-DC converter.

An apparatus includes a controller configured to generate a PWM signal for controlling a power switch of a forward converter, a bias switch and a bias capacitor connected in series and coupled to a bias winding of the forward converter, and a comparator having a first input connected to the bias capacitor, a second input connected to a predetermined reference and an output configured to generate a signal for controlling the bias switch to allow a magnetizing current from the bias winding to charge the bias capacitor when a voltage across the bias capacitor is less than the predetermined reference.

Techniques for a sinking and sourcing power stage are provided. In an example, a power stage circuit can include a first power transistor configured to couple to a first input power rail, a second power transistor configured to couple to a second input power rail, an output node configured to couple to a load and to couple the first power transistor in series with the second power transistor between the first and second input power rails, and a controller configured to operate the first and second power transistors in a first mode to source current to the load and to operate the first and second power transistors in a second mode to sink current from the load.

A bridge circuit including: first and second high-side switches; first and second low-side switches; a transformer having primary and secondary coils; a coil; and a current injection device; wherein the first high-side switch and the first low-side switch are connected at a first bridge terminal in a series circuit to form a first branch; the second high-side switch and the second low-side switch are connected at a second bridge terminal in a series circuit to form a second branch; the first and second branches are connected in a parallel circuit at first and second input terminals; the secondary coil has first and second output terminals; the primary coil and the coil are connected in a series circuit to connect the first bridge terminal to the second bridge terminal; and wherein the current injection device is configured to inject a predetermined current into the coil at a predetermined point in time.

A bidirectional DC-DC converter with three or more ports is described along with a method of operation thereof. The converter utilizes a common transformer for all ports and allows for power transfer from any port to any or all of the remaining ports. The converter may utilize a controller which implements variable-frequency control, delay-time control, and/or phase-delay control to achieve power transfer as desired between the converter ports. In some cases, power transfer between ports can operate similar to a series-resonant converter or a dual active bridge converter.

An isolated gate driver includes a transformer including primary and secondary windings, a synchronous rectifier connected between the secondary winding and an output terminal of the isolated gate driver, a first switch including a first terminal connected to a supply voltage, a second switch including a first terminal connected to the supply voltage, a first damping resistance connected between a first terminal of the secondary winding and a second terminal of the first switch, a second damping resistance connected between a second terminal of the secondary winding and a second terminal of the second switch, a first inverter including an input connected to the first terminal of the secondary winding and an output connected to a gate terminal of the first switch, and a second inverter including an input connected to the second terminal of the secondary winding and an output connected to a gate terminal of the second switch.