Abstract: A power circuit includes a power input terminal, a power factor correction circuit, a DC-DC conversion circuit and a power output terminal connected in sequence. The power factor correction circuit includes an input rectifier unit, a first inductor, a first diode, a first capacitor, a power switch transistor, and a rheostat unit.

Abstract: The present application provides a synchronous rectification assembly, a manufacturing method thereof and a power supply. The synchronous rectification assembly comprises a first circuit board, a transformer, an electrical connection piece and a second circuit board; wherein the transformer is electrically connected to the first circuit board, and the second circuit board is provided with a conductive contact for being electrically connected to an external apparatus, and the electrical connection piece is electrically connected to the first circuit board and the second circuit board respectively; the first circuit board is configured to perform synchronous rectification on the output signal of the transformer and then transmit the output signal to the conductive contact of the second circuit board through the electrical connection piece.

Abstract: This disclosure provides a multifunctional interface conversion device and a multifunctional interface conversion system. The multifunctional interface conversion device includes a power adapter module and an interface conversion module. The power adapter module includes an AC-to-DC conversion unit, a first DC-to-DC conversion unit, and a power output terminal. The interface conversion module includes a first power management unit and a first interface. This disclosure combines the power adapter module and the interface conversion module to obtain the multifunctional interface conversion device.

Abstract: The present disclosure provides a Direct Current to Direct Current (DCDC) converter and a control method thereof. The Direct Current to Direct Current (DCDC) converter comprises: at least one DCDC conversion module and a controller, wherein each of the DCDC conversion modules comprises two bidirectional isolated DCDC units connected in parallel, each of the bidirectional isolated DCDC units comprises a resonant circuit and a non-isolated buck/boost circuit connected in cascade; if the number of the DCDC conversion modules is greater than or equal to 2, the DCDC conversion modules are connected in parallel; the controller is connected to each of the bidirectional isolated DCDC units, and control current sharing among the non-isolated buck/boost circuits. The Direct Current to Direct Current (DCDC) converter and the control method thereof according to the embodiments of the present disclosure reduce the manufacturing cost of the Direct Current to Direct Current (DCDC) converter.

Abstract: The present application provides a three-level control circuit, a power conversion device and a control method thereof. The three-level control circuit includes two first main lines and two second main lines between a three-phase port and a two-phase terminal thereof. The first main line includes a plurality of first conversion branches, the second main line includes two capacitor branches and a plurality of second conversion branches, and the first conversion branches and the second conversion branches are in interleaved connection by an inverter interleaving technology. Each of the capacitor branches has a third capacitor and a fourth capacitor connected in series. The plurality of the first conversion branches of each of the first main lines are respectively connected to correspond to the capacitor branch, and a connection point is located between the third capacitor and the fourth capacitor.

Abstract: The present disclosure provides a forward-backward boost-buck charging and discharging circuit and an electric tool. The forward-backward boost-buck charging and discharging circuit comprises a battery, a forward-backward boost-buck charging and discharging unit and a first control unit, wherein the battery is configured to store power and supply power to a load; the forward-backward boost-buck charging and discharging unit is configured to charge and discharge the battery; the first control unit is configured to control the forward-backward boost-buck charging and discharging unit to supply power to the load, and to control the forward-backward boost-buck charging and discharging unit to boost or buck an external input voltage to charge the battery; the forward-backward boost-buck charging and discharging unit is connected to the battery and the first control unit.

Abstract: The present disclosure provides a power supply system and a power supply method, which can be applied to the field of power distribution technologies. The power supply system comprises: a DC rectifying device, an industrial frequency transformer and at least two power supply devices, wherein the industrial frequency transformer is connected between the power supply device and the DC rectifying device, and the DC rectifying device is further connected to a load. The power supply system and the power supply method according to the embodiments of the present disclosure reduce the development cost and the development period of the power supply system.

Abstract: The present application provides a power supply device compatible with AC/DC input and a control method thereof, the device comprising a power factor correction circuit, a direct current-to-direct current (DC/DC) circuit, a bypass circuit, an input sampling circuit, and a controller. The power factor correction circuit is connected to the DC/DC circuit. The bypass circuit is connected to a boost circuit input end of the power factor correction circuit and an input end of the DC/DC circuit. The controller is connected to the input sampling circuit and the power factor correction circuit respectively, for controlling the power factor correction circuit to stabilize the output voltage within a preset range according to an input signal collected by the input sampling circuit, or turning off the power factor correction circuit and providing power for the DC/DC circuit via the bypass circuit.

Abstract: Embodiments of this disclosure provide an active current limiting circuit, a power supply device, a power supply system and a control method, wherein at least one bidirectional switch in the active current limiting circuit is turned on or off based on the current sampling signal obtained by sampling the current in the bidirectional switch in the active current limiting circuit. With the active current limiting circuit, the inrush current generated in switching the power supply lines may be efficiently reduced, power consumption may be lowered, output of large power may be provided, the capacitor may be charged and sufficient power output may be provided to the load. And furthermore, the bidirectional switch in the active current limiting circuit may be flexibly controlled based on the current sampling signal, thereby improving operating efficiency of the active current limiting circuit.

Abstract: Embodiments of this disclosure provide an active current limiting circuit, a power supply device, a power supply system and a control method, wherein multiple current limiting switches in the active current limiting circuit are turned on or off according to the current sampling signal and the result of comparison of voltages obtained by sampling currents in the current limiting switch unit of the active current limiting circuit or currents in the power factor correction circuit and voltages at the first end and second end of the input bus. With the active current limiting circuit, the inrush current generated in switching the power supply lines may be efficiently reduced, power consumption may be lowered, output of large power may be provided, the capacitor may be charged and sufficient power output may be provided to the load.

Abstract: A power supply circuit includes: a power input terminal configured to provide first power; at least two power output terminals each configured to provide second power to an external load; at least two flyback conversion circuits each coupled to the power input terminal and a respective one of the at least two power output terminals to convert the first power to the second power; and a flyback control circuit coupled to each of the at least two flyback conversion circuits, the flyback control circuit being configured to control the at least two flyback conversion circuits to be connected in parallel when one of the at least two power output terminals outputs the second power.

Abstract: Embodiments of this disclosure provide a power supply device, a resonant converter circuit and controlling method thereof. The circuit includes: an inverter circuit, a resonant circuit, a rectifier circuit, a switch, and a second inductor, wherein the inverter circuit is connected to the resonant circuit for converting direct currents into alternating currents to output to the resonant circuit, the resonant circuit is connected to the rectifier circuit for outputting the alternating currents to the rectifier circuit after resonant conversion, and the rectifier circuit is used for outputting direct currents; the resonant circuit includes a first inductor and a first capacitor, the first inductor, the first capacitor and the second inductor are connected in series, the switch is connected in parallel with the second inductor, and the rectifier circuit is connected to both ends of the second inductor.

Abstract: This disclosure provides a multifunctional interface conversion device and a multifunctional interface conversion system. The multifunctional interface conversion device includes a power adapter module and an interface conversion module. The power adapter module includes an AC-to-DC conversion unit, a first DC-to-DC conversion unit, and a power output terminal. The interface conversion module includes a first power management unit and a first interface. This disclosure combines the power adapter module and the interface conversion module to obtain the multifunctional interface conversion device.

Abstract: A power supply system includes: a first direct current (DC) input terminal for providing first initial DC power; a second DC input terminal for providing second initial DC power; a transfer switch unit coupled to the first DC input terminal and the second DC input terminal, wherein the transfer switch unit is configured to select the first initial DC power or the second initial DC power as third initial DC power input to the power supply system; and conversion circuitry coupled to the transfer switch unit, wherein the conversion circuitry is configured to convert the third initial DC power into a target power supply for a load device.

Abstract: A power supply system includes a power input terminal, a rectifying circuit and a power output terminal coupled in sequence. The rectifying circuit includes an AC-DC conversion circuit and a DC-DC conversion circuit coupled via a first DC bus. The power supply system further includes at least one energy storage circuit coupled to the first DC bus. When AC power is input to the power input terminal, the AC-DC conversion circuit can convert the AC power into first DC power and input the first DC power to the energy storage circuit so that the energy storage circuit is charged. When the AC power fails to be input to the power input terminal, the energy storage circuit can discharge by outputting second DC power to the DC-DC conversion circuit.

Abstract: A power control circuit and a control method thereof.

Abstract: The present disclosure provides a circuit control method and a circuit control apparatus, which are applied to a hybrid flyback circuit. The method includes: determining an acquisition time point according to a turn-on alternating duration of a first MOS switch and a second MOS switch on a main side of the hybrid flyback circuit and a preset time coefficient; acquiring a midpoint voltage between the first MOS switch and the second MOS switch according to the acquisition time point to obtain a first voltage signal; and adjusting negative excitation current in the hybrid flyback circuit according to a comparison result of the first voltage signal and a preset voltage value, so that the negative excitation current meets zero voltage switching of a primary-side switch of the hybrid flyback circuit.

Abstract: The present application provides a magnetic assembly, a manufacturing method thereof, a power module and a switching power supply. The magnetic assembly comprises at least two X-type magnetic cores and at least one I-type magnetic core; a winding is arranged on the X-type magnetic core, and the at least two X-type magnetic cores and the at least one I-type magnetic core form a closed magnetic circuit; the X-type magnetic core includes a winding post and four side posts surrounding the winding post, and one side of each of the four side posts is respectively connected with one side of the winding post to form a connection surface; the other sides of the four side posts and the winding post are respectively arranged in contact with the connection surface of the I-type magnetic core or other X-type magnetic cores. The application can solve the problem of poor heat dissipation after integration of a plurality of magnetic elements.

Abstract: The present application provides a synchronous rectification assembly, a manufacturing method thereof and a power supply. The synchronous rectification assembly comprises a synchronous rectification board, a transformer and a main board; wherein the synchronous rectification board is disposed on the main board and is electrically connected to the main board, and the transformer is disposed on the synchronous rectification board and is electrically connected to the synchronous rectification board; the synchronous rectification board is provided with a conductive contact for being electrically connected to an external apparatus, and the synchronous rectification board is used for synchronously rectifying an output signal of the transformer and thereafter transmitting the output signal to the conductive contact. The present application can solve the problem that the output signal outputted by the transformer in the existing synchronous rectification assembly has a large loss during transmission.

Abstract: The present application provides a synchronous rectification assembly, a manufacturing method thereof and a power supply. The synchronous rectification assembly comprises a first circuit board, a transformer, an electrical connection piece and a second circuit board; wherein the transformer is electrically connected to the first circuit board, and the second circuit board is provided with a conductive contact for being electrically connected to an external apparatus, and the electrical connection piece is electrically connected to the first circuit board and the second circuit board respectively; the first circuit board is configured to perform synchronous rectification on the output signal of the transformer and then transmit the output signal to the conductive contact of the second circuit board through the electrical connection piece.