An alternating current to direct current conversion circuit includes a rectifier circuit, a first DC to DC conversion module and a second DC to DC conversion module. The first DC to DC conversion module includes multiple power switches and an inductor and is coupled between the rectifier circuit and the second DC to DC conversion module. Multiple power switches in the first DC to DC conversion module are controlled to be turned on simultaneously, so that a voltage across each of the power switches in the first DC to DC conversion module is reduced. The alternating current to direct current conversion circuit includes no power switch with a high withstand voltage, so that the alternating current to direct current conversion circuit has a small volume, low switching loss, less energy loss, and good heat dissipation, thereby increasing power density.

An apparatus for supplying power to a high-capacity load includes a three-to-two phase transformer including an input side three-phase transformer terminal for connection to a three-phase supply grid and output side first and second output-side single-phase transformer terminals. A converter arrangement has a first partial converter including a first input-side, single-phase AC voltage terminal for the first output-side transformer terminal and a first single-phase output terminal. A second partial converter has a second input-side single-phase AC voltage terminal for the second output-side transformer terminal and a second single-phase output connector. The partial converters are mutually connectable by the output terminals in an output-side series and/or parallel circuit and form a single-phase load terminal for the high-capacity load. A method for supplying power to a high-capacity load is also provided.

Techniques for an electronic device to perform power-stealing techniques to harvest energy from a power-control circuit to power components of the electronic device. In some examples, the electronic device may be connected in the power-control circuit between a power supply and a relay that is selectively configured to activate a power load. According to the techniques described herein, the electronic device may include voltage-drop circuitry that is connected in the power-control circuit such that a voltage drop is produced across electrical components of the electronic device while the relay is in the activated, or triggered, state. In this way, the electronic device may perform power-stealing from the power-control circuit while the relay is maintained in the activated state.

A zero-crossing detection circuit includes a zero-crossing detection unit arranged to compare a first monitoring target signal and a second monitoring target signal respectively input through diodes from a first node and a second node between which an AC signal is applied, so as to generate a first comparison signal, and a logic unit arranged to estimate a zero cross of the AC signal from the first comparison signal so as to generate a zero-crossing detection signal. The zero-crossing detection circuit preferably includes a monitoring unit arranged to adjust the first monitoring target signal and the second monitoring target signal to be suitable for input to the zero-crossing detection unit. The logic unit preferably counts a period of the first comparison signal and estimates a zero cross of the AC signal using a count value thereof.

An integrated circuit for a power supply circuit. The integrated circuit includes an oscillator circuit configured to output an oscillator voltage that rises with a predetermined slope from a first voltage, upon an inductor current of the power supply circuit becoming smaller than a first predetermined value, an error voltage output circuit configured to output an error voltage corresponding to a difference between a reference voltage and a feedback voltage corresponding to the output voltage, a drive circuit configured to turn on and off a transistor of the power supply circuit respectively upon the inductor current becoming smaller than the first predetermined value, and upon the oscillator voltage reaching a second voltage that is based on the error voltage, and an output circuit configured to change the first and/or second voltage based on a rectified voltage obtained by full-wave rectification of the AC voltage, and to output the changed voltage.

An alternating current to direct current conversion circuit includes a rectifier circuit, a first DC to DC conversion module and a second DC to DC conversion module. The first DC to DC conversion module includes multiple power switches and an inductor and is coupled between the rectifier circuit and the second DC to DC conversion module. Multiple power switches in the first DC to DC conversion module are controlled to be turned on simultaneously, so that a voltage across each of the power switches in the first DC to DC conversion module is reduced. The alternating current to direct current conversion circuit includes no power switch with a high withstand voltage, so that the alternating current to direct current conversion circuit has a small volume, low switching loss, less energy loss, and good heat dissipation, thereby increasing power density.

An alternating current to direct current conversion circuit includes N first power converters instead of a boost circuit including a power switch with a high withstand voltage. The N first power converters each have an input end and theses input ends are connected in series, to perform power factor correction. Therefore, the alternating current to direct current conversion circuit includes no power switch with a high withstand voltage, so that the alternating current to direct current conversion circuit has a small volume, low switching loss, less energy loss, and good heat dissipation, thereby increasing power density.

Examples of the present disclosure provides a BUCK topological circuit for power supply including a rectification circuit, a first filter energy-storage circuit, a step-down constant-current driver chip, an output current setting circuit, a freewheeling circuit, a transformer, and a second filter energy-storage circuit. An external power supply capacitor is not required in the step-down constant-current driver chip.

The present application provides a power converter and a power supply system, the power converter includes: a star/delta switching unit, a first power conversion unit, a second power conversion unit, a third power conversion unit, and a controller; AC terminals of the first power conversion unit, the second power conversion unit and the third power conversion unit are connected to a three-phase AC terminal through the star/delta switching unit, and DC terminals of the first power conversion unit, the second power conversion unit, and the third power conversion unit are connected to a DC power terminal; wherein the controller is configured to control the star/delta switching unit according to a signal reflecting a voltage of the DC power terminal, to form a star connection or a delta connection among the three-phase AC terminal and the first power conversion unit, the second power conversion unit and the third power conversion unit.

Provided herewith is a closed loop circuit including a transistor operable as a microscopic switch device to amplify electron pressures. The transistor has a collector connected to a positive voltage source. An optocoupler is provided, connected in parallel to the positive voltage source, and triggered in response to a triggering unipolar pulse from a network. An output of the optocoupler is connected to a base of the transistor. A capacitor is provided, connected between the emitter of the transistor and a ground, and having an anode and a cathode for receiving a capacitive dielectric medium therebetween, such that, electrons flow through dielectric medium to the transistor from a ground state in order to break down the dielectric material. In the preferred embodiment, the dielectric material includes water which is dissociated into hydrogen and oxygen.