Example bidirectional energy transmission apparatus and methods are described. An example of a bidirectional energy transmission apparatus includes a controller and a bidirectional energy transmission circuit. A control terminal of the controller is connected to a controlled terminal of the bidirectional energy transmission circuit. In the example, the controller is configured to control the bidirectional energy transmission circuit to be in a rectification working state, so as to convert, into a first direct current voltage, a three-phase or single-phase alternating current voltage that is input from a first port of the bidirectional energy transmission circuit, and output the first direct current voltage from a second port of the bidirectional energy transmission circuit. The controller is configured to control the bidirectional energy transmission circuit to be in an inversion working state, so as to convert, into a three-phase or single-phase alternating current voltage.

The present invention relates to the control of a dual active bridge converter. In particular, it is provided that a control variable for the dual active bridge converter is superimposed with an additional ripple component and to control the dual active bridge converter with a combination of the control variable and the additional ripple component.

Method and apparatus include a first stage converter configured to generate a half sine wave, and a second stage converter in electrical communication with the first stage converter and configured to transform the half sine wave into a power signal. The second stage converter may further supply the power signal to an electrical grid. In one example, the second stage converter may include an isolated, unregulated, resonant direct current/alternating current (DC/AC) converter.

The disclosure provides a power supply unit, including: a first high-frequency isolating converter including a first end connected to a first voltage, a second end and a third end; and a second high-frequency isolating converter including a first end connected to a second voltage, a second end and a third end, wherein the second end of the second high-frequency isolating converter and the second end of the first high-frequency isolating converter are connected in parallel to a first end of a first load, and the third end of the second high-frequency isolating converter and the third end of the first high-frequency isolating converter are connected in parallel to a second end of the first load. The disclosure further provides a loop power supply system having the power supply unit.

A power conversion circuit includes a first terminal, a second terminal, a first switching conversion unit, a second switching conversion unit, a flying capacitor and a magnetic element. The first switching conversion unit includes a first switch and a third switch. The second switching conversion unit includes a second switch and a fourth switch. The magnetic element includes two first windings and a second winding. A first one of the two first windings is serially connected between the flying capacitor and the second terminal. A second one of the two first windings is serially connected between the second switch and the second terminal. The second winding is serially connected with the flying capacitor and the first one of the two first windings. A turn ratio between the second winding, the first one of the two first windings and the second one of the two first windings is N:1:1.

A power conversion system including a triple active bridge (TAB) is provided. The system includes a power factor correction (PFC) module and a three port converter (TPC) module, with no post-regulation or additional stages required. The TPC module includes an OBC full-bridge and an APM full-bridge, each being inductively coupled to the output of the PFC full-bridge, thereby forming the TAB. The OBC full-bridge is adapted to convert an AC input into a high-voltage DC output for a high-voltage battery, and the APM full-bridge is adapted to convert an AC input into a low-voltage DC output for a low-voltage battery. The power conversion system can accept a single-phase AC input and a three-phase AC input, has a lower current stress as compared to prior art TPCs, and freely transfers power from among any ports.

An embodiment bidirectional charging system for a vehicle includes a first bridge circuit having a plurality of legs each including two first switching elements connected in series with each other between both ends of a battery, a transformer comprising a plurality of primary-side windings connected to a grid or load side and a plurality of secondary-side windings insulated from the plurality of primary-side windings, a motor including a plurality of input terminals configured to receive a plurality of phase voltages, respectively, a plurality of changeover switches configured to selectively connect connection nodes of the two first switching elements included in the plurality of legs to the plurality of secondary-side windings or to the plurality of input terminals, respectively, and a controller configured to control connection states of the plurality of changeover switches according to a pre-configured operation mode.

A drive circuit driving a first switching element, including: a first diode with a cathode terminal connected to a first switching element gate terminal; a second switching element with a first terminal connected to a first diode anode terminal, a second terminal connected to a first switching element gate terminal, a third terminal connected to a first switching element source terminal; a third switching element with a drain terminal connected to the first diode anode terminal, and a source terminal connected to the first switching element source terminal; a parallel circuit; and a drive transformer having a coil, one end connected to the drain terminal, the other end connected to the third switching element gate terminal, and connected to the third switching element source terminal, one end of the parallel circuit connected to one coil end, the second diode cathode terminal connected to the other end of the coil.

An energy conversion system, an energy conversion method, and a power system. The energy conversion system may include a bridge arm conversion module, a direct current to direct current (DC/DC) conversion module, a motor, a bus capacitor, and a control module. The control module may be configured to control a bridge arm switch action in the bridge arm conversion module, drive the motor based on an alternating current input voltage supplied by a power supply, form a bus voltage at two ends of the bus capacitor, and control the DC/DC conversion module to charge a traction battery and an auxiliary battery based on the bus voltage. The traction battery and the auxiliary battery can be charged while the motor is driven, thereby achieving higher energy conversion efficiency, low costs, and strong applicability.

Disclosed is a three-phase interleaved resonant converter, which includes a three-phase inversion circuit connected to an input voltage and including a first output node, a second output node, and a third output node, a three-phase transformer including three transformers, a three-phase resonant circuit including three resonant capacitors and three resonant inductors, and a three-phase rectifier filter circuit. One ends of the three resonant inductors are respectively connected to the first output node, the second output node and the third output node, and the other ends of the three resonant inductors are respectively connected to a triangular configuration formed by an alternate connection of the three resonant capacitors with primary windings of the three transformers. The three-phase rectifier filter circuit is connected with secondary windings of the three transformers to rectify and filter secondary currents output by the secondary windings of the three transformers respectively, and generate an output voltage accordingly.