A bi-directional DC-DC converter and an on-board charger with the bi-directional DC-DC converter integrated into it are disclosed for converting a first voltage to a second voltage. The bi-directional DC-DC converter includes a transformer for magnetically coupling a primary circuit receiving the first voltage on a primary side with a rectification circuit on a secondary side. Further, a high voltage power source is connected to the rectification circuit for supplying a high voltage to one or more high voltage loads and a low voltage power source is connected to the high voltage power source through a secondary circuit for supplying a second voltage to one or more low voltage loads. The bi-directional DC-DC converter functions in both stationary condition and running condition of a powered device.

An electric vehicle that includes an on-board charger for a battery of an electric vehicle. The electric vehicle includes an AC machine and an inverter drive for the AC machine. The on-board charger includes an integrated active filter rectifier coupled to a DC/DC converter. The integrated active filter rectifier is configured to use at least one phase inductor of the AC machine and at least one leg of the inverter drive to perform power factor correction. The on-board charger is a non-isolated converter that renders both operations of traction and charging from both single-phase and three-phase grids. Moreover, the on-boar charger performs fast AC charging without generating shaft torque during charging.

A power converter may be configured to power multiple output loads, including a main output load and at least one auxiliary output load. The power converter may include control circuitry that controls power delivery to output circuits coupled to the output loads. When the main output load is operating in a reduced power mode, the control circuitry may trigger the switching circuitry to increase the supply of power in order to increase the auxiliary voltages used to power the auxiliary loads if one or more of the auxiliary voltages drops below a threshold due to the main output load operating in the reduced power mode.

A charger for a battery power system can include first and second switching bridges with inputs couplable to an AC source, at least one transformer having two or more primary windings (connected in series and coupled to the switching bridges) and at least two secondary windings, and second rectifier/chargers, each coupled to at least one of the secondary windings and couplable to at least one battery. The switching bridges may be respectively operable during positive and negative half cycles of the AC source to deliver an AC voltage to the transformer. The rectifier/chargers may be operable in a first mode to receive an AC voltage from the transformer and deliver a DC voltage for charging the respective battery. In some multi-battery embodiments, the rectifier/chargers may also be operable in a second mode to deliver an AC voltage from a respective battery to the transformer to balance charge between the batteries.

A power conversion apparatus includes a primary side circuit, a secondary side circuit magnetically coupled to the primary side circuit through a transformer, and a control unit that adjusts transmitted power transmitted between the primary side circuit and the secondary side circuit by changing a phase difference between switching of the primary side circuit and switching of the secondary side circuit. The control unit suppresses a fluctuation in the transmitted power by suppressing a change in a duty ratio of the switching of the primary side circuit to the switching of the secondary side circuit.

A power supply device, includes a rectifier circuit configured to perform rectification on alternating-current power to obtain a first pulsating direct-current voltage, a first-stage conversion circuit connected to the rectifier circuit and configured to perform isolation conversion on the first pulsating direct-current voltage to thereby obtain a second pulsating direct-current voltage; a second-stage conversion circuit connected to the first-stage conversion circuit and configured to convert the second pulsating direct-current voltage into a stable direct-current voltage; and a valley-fill circuit connected to the rectifier circuit and the first-stage conversion circuit individually, wherein the valley-fill circuit is configured to supply, in response to a voltage value of the first pulsating direct-current being less than a first voltage threshold, electrical power to an input of the first-stage conversion circuit to thereby increase a valley voltage of the first pulsating direct-current voltage.

The electrical energy conversion system comprises: a converter including E first switching assembly or assemblies, each associated with an input voltage and including two first switches; N second switching assembly or assemblies, each associated with an output voltage and including two second switches; and at least one piezoelectric assembly connected to a switch; E>1, N>1; a control device configured for controlling, during a resonance cycle, a switching of the switches so as to alternate phases at constant voltage and phases at constant load across said piezoelectric assembly or assemblies.

The converter comprising an electrical transformer having a primary winding connected to a first switching assembly and a secondary winding connected to a second switching assembly, and each piezoelectric assembly being connected between a switch and a winding.

An xenon lamp power supply, a purification device, and a refrigeration device are provided. The xenon lamp power supply comprises: an input circuit, a coupling assembly, an output circuit, and a control circuit. The input circuit comprises an alternating-current input end and a direct-current output end, and the input circuit is used for converting alternating current input by the alternating-current input end into direct current output by the direct-current output end. A first end of the coupling assembly is connected to the direct-current output end. The output circuit comprises a xenon lamp power supply circuit, and the xenon lamp power supply circuit is connected to a second end of the coupling assembly, so as to convert electric energy from the second end into direct-current power, and then supply power to a xenon lamp.

A switching power supply device that switches setting of an output voltage based on an external signal according to one or more embodiments includes: a transformer including a primary winding and n secondary windings; n synchronous rectification elements provided, corresponding to the n secondary windings; and n−1 switch elements that switch the secondary windings. Each of the n−1 switch elements is kept on or off according to a high or low voltage value out of set voltages of the output voltage, and all or any of the n synchronous rectification elements are selected to synchronously rectify pulse voltage of the secondary windings, and when operation with a high set value of the output voltage stops, a synchronous rectification element used to output the high set value performs switching operation until the output voltage goes down to the low voltage value of the set voltages of the output voltage.

An improved distributed-output multi-cell-element power converter utilizes a multiplicity of magnetic core elements, switching elements, capacitor elements and terminal connections in a step and repeat pattern. Stepped secondary-winding elements reduce converter output resistance and improve converter efficiency and scalability to support the high current requirements of very large scale integrated (“VLSI”) circuits.