Abstract: A power conversion device includes a first filter inductor and an AC/AC circuit, where the first filter inductor includes three inductor windings, and a first inductor magnetic core. The first inductor winding, the second inductor winding, and the third inductor winding are all wound around the first inductor magnetic core. The first inductor winding is connected to a first input end of the power conversion device, the second inductor winding is connected to a second input end and a second output end of the power conversion device, the first inductor winding and a second end of the second inductor winding are separately connected to the AC/AC circuit, the third inductor winding is connected to a first output end of the power conversion device, and the second inductor winding and a second end of the third inductor winding are separately connected to the AC/AC circuit.

Abstract: The battery assembly includes a control unit and a DCDC converter. The control unit is configured to, when a first load is short-circuited in a process in which the battery assembly supplies power to the first load, control the DCDC converter to output a first current. The first current is greater than a maximum nominal discharge current of the battery assembly, is used to break an electrical connection between the first load and a busbar, and is less than a short-circuit protection current of the battery assembly; and/or the control unit is configured to, after a power supply encounters a power failure, control a discharge capability of the battery assembly to be greater than a maximum nominal discharge capability of the battery assembly, and supply power to a first load and a second load by using a DCDC converter.

Abstract: Examples of an equalization circuit, a battery pack, and an energy storage system are described. In one example, an equalization circuit is configured to: when a difference between a state of charge (SOC) of a battery pack and an SOC or SOCs of any one or more other battery packs exceeds an equalization threshold, by turning on or off switch transistors of a bridge resonant circuit and a bridge circuit, receive, through an equalization bus, discharge power of the one or more other battery packs, and input charge power to the battery pack; or receive discharge power output by the battery pack, and output, to the equalization bus, charge power for inputting to the one or more other battery packs, so that uniformity between SOCs of the battery packs can be flexibly adjusted.

Abstract: A power supply circuit may include a plurality of first switches, a plurality of second switches, and a third switch. The plurality of first switches may be in a one-to-one correspondence with the plurality of load units, and the plurality of second switches may be in a one-to-one correspondence with the plurality of load units. A first end of each first switch and a first end of the third switch may be connected to a first end of a direct current power supply, a second end of each first switch may be connected to a first end of a corresponding second switch and a first end of a corresponding load unit, a second end of each second switch may be connected to a second end of the third switch, and a second end of the direct current power supply may be connected to a second end of each load unit.

Abstract: A battery management system includes a sampling control unit, a DC/DC conversion unit, and an energy storage unit. When the battery pack needs to be heated, based on battery parameters of the battery pack and a voltage and a current limit value of the DC/DC conversion unit, the sampling control unit may control, in each of at least one consecutive first cycle, the battery pack to discharge to the energy storage unit by using the DC/DC conversion unit; control, in each of at least one consecutive second cycle, the energy storage unit to charge the battery pack by using the DC/DC conversion unit; and control, in the at least one consecutive first cycle and the at least one consecutive second cycle, an average charge/discharge current value of the battery pack to be less than or equal to a charge/discharge current limit value.

Abstract: The voltage sampling apparatus includes a differential circuit, a voltage division circuit, and a first calibration switch. A first output end of the differential circuit and an input end of a first voltage division branch of the voltage division circuit are connected to one end of the first calibration switch. A second output end of the differential circuit and an input end of a second voltage division branch of the voltage division circuit are connected to the other end of the first calibration switch. When the first calibration switch is in an on state, the differential circuit is configured to input a target signal to the first voltage division branch and the second voltage division branch that are connected in parallel.

Abstract: A power conversion apparatus and an energy storage system, including a power conversion circuit, a first power terminal, a second power terminal, and a third power terminal. The power conversion circuit includes a first positive end, a first negative end, a second positive end, a second negative end, and at least one power device. The first negative end and the second negative end have a same potential. The power conversion circuit is configured to convert a first voltage input by a first device into a second voltage and output the second voltage to a second device. The first power terminal is connected to the first positive end, the first negative end or the second negative end is connected to the second power terminal, and the third power terminal is connected to the second positive end.

Abstract: A power converter includes a protection circuit, a controller, and a power conversion circuit. The protection circuit includes a first positive temperature coefficient (PTC) resistor, a first switch unit, and a second switch unit. The power conversion circuit includes a direct current bus, and the direct current bus includes a positive direct current bus and a negative direct current bus. The first switch unit is connected between a power supply and an input end of the power conversion circuit or is connected in series on the direct current bus of the power conversion circuit. The first PTC resistor is connected in parallel to the first switch unit. The second switch unit is connected in parallel between a positive port and a negative port of the input end of the power conversion circuit or is connected in parallel between the positive direct current bus and the negative direct current bus.

Abstract: Embodiments of this application provide a power supply method and apparatus, an electronic device, and a readable storage medium. The method includes: determining whether a current power grid is a weak power grid; if the current power grid is a weak power grid, determining a target current limit value based on an actual input voltage of a power system; and supplying power to a load based on the target current limit value. The power system may adaptively adjust a current limit value of the power system based on an input voltage, so as to supply power to the load while avoiding undervoltage in the power system.

Abstract: This application discloses a three-wire DC-DC converter and a parallel power supply system. The parallel power supply system includes a common wiring busbar, an input wiring busbar, an output wiring busbar, and at least two three-wire DC-DC converters. Each three-wire DC-DC converter includes a DC-DC conversion circuit, an input wiring terminal, an output wiring terminal, and a common wiring terminal. Input wiring terminals of all the three-wire DC-DC converters are connected in parallel to the input wiring busbar, output wiring terminals of all the three-wire DC-DC converters are connected in parallel to the output wiring busbar, and the common wiring terminals of all the three-wire DC-DC converters are connected in parallel to the common wiring busbar. The wiring busbar is configured to connect a first direct current power supply and a load.

Abstract: A matrix transformer, a power converter, and a matrix transformer winding arrangement method. Each of the magnetic core columns of n sub-transformers of the matrix transformer is wound with a first winding and a second winding, first windings are used to form a high-voltage-side winding of the matrix transformer, and second windings are used to form a low-voltage-side winding of the matrix transformer. A ratio of a turn quantity design value of the high-voltage-side winding to the quantity n of the sub-transformers is not an integer.

Abstract: A bridgeless PFC circuit includes: a control module that collects a current flowing through a current sampling element; and when the current flowing through the current sampling element is greater than a first threshold, the control module controls a switch element to be turned on. Based on the current flowing through the current sampling element, the switch element can be controlled to be turned on, thereby implementing zero-voltage turn-on of the switch element. Because the collected current does not change abruptly, a delay requirement on a sampling control circuit included in the control module is lowered, and a signal anti-interference capability of the control module is strong.

Abstract: The battery control circuit includes a first inductor, a first switch tube, a second switch tube, a first diode, and a second diode. A first terminal of the first switch tube and a cathode of the first diode are both coupled to the positive electrode of the battery pack, and a second terminal of the first switch tube is coupled to a terminal of the first inductor and a cathode of the second diode. An anode of the first diode is coupled to another terminal of the first inductor and a first terminal of the second switch tube, and a second terminal of the second switch tube and an anode of the second diode are both coupled to the negative electrode of the battery pack. The first switch tube and the second switch tube are simultaneously turned on or turned off.

Abstract: A thin-wall bearing, including an outer ring and an inner ring. The inner ring surface of the outer ring is provided with an outer ring raceway, and the outer ring surface of the inner ring is provided with an inner ring raceway. A steel ball and a cage for installing the steel ball are arranged between the outer ring raceway and the inner ring raceway. A plurality of screw holes are evenly distributed in a circle around the side wall of the outer ring, and knurled screws are provided in the screw holes, respectively. The fit between the knurled screw and the screw hole 10-?9 is to be N6/h5. The radial clearance of the thin-wall bearing is greater than or equal to 0.01 but less than or equal to 0.09. A processing method of the thin-wall bearing.

Abstract: This application discloses a compensation circuit and method for potential induced degradation, a power module, and a photovoltaic system. The compensation circuit includes a switch, a first resistor, and a controller. The switch and the first resistor are connected in series, a first end of the compensation circuit is connected to a positive output end PV+ of a photovoltaic module, and a second end of the compensation circuit is connected to a second end of a first DC-DC converter. The controller is configured to control the switch to be closed when output voltage of the photovoltaic module is less than preset voltage, so that the first DC-DC converter provides electric energy of the battery to the second end of the compensation circuit. A second resistor is connected between the positive output end PV+ and a negative output end PV? of the photovoltaic module.

Abstract: A thin-wall bearing, including an outer ring and an inner ring. The inner ring surface of the outer ring is provided with an outer ring raceway, and the outer ring surface of the inner ring is provided with an inner ring raceway. A steel ball and a cage for installing the steel ball are arranged between the outer ring raceway and the inner ring raceway. A plurality of screw holes are evenly distributed in a circle around the side wall of the outer ring, and knurled screws are provided in the screw holes, respectively. The fit between the knurled screw and the screw hole 10-?9 is to be N6/h5. The radial clearance of the thin-wall bearing is greater than or equal to 0.01 but less than or equal to 0.09. A processing method of the thin-wall bearing.

Abstract: Embodiments of the present application provide an insulation and heat radiation structure of a power device, a circuit board, and a power supply apparatus. The insulation and heat radiation structure of the power device includes a power device, an insulation ceramic piece, and a heat radiator, where the power device is of a sheet structure, the insulation ceramic piece is an alumina ceramic piece, a heat radiator pin is disposed on the heat radiator, the heat radiator pin is used for being mechanically connected to the circuit board, a heating surface of the power device is adhesively fixed to one surface of the insulation ceramic piece through a first insulating thermal conductive adhesive, and the other surface of the insulation ceramic piece is adhesively fixed to a contact heat radiation surface of the heat radiator through a second insulating thermal conductive adhesive.

Abstract: An embodiment integrated common mode choke comprises a magnetic core, a magnetic plate, a first winding coil and a second winding coil. The magnetic plate is inserted within an inner circumference of the magnetic core. The first winding coil and the second winding coil are wound are wound in the same direction through the magnetic core. The integrated common mode choke is equivalent to a common mode choke and a differential mode choke connected in series. The inductance value of the differential mode choke can be changed by adjusting either the gap between the magnetic plate and the magnetic core or the thickness of the magnetic plate.

Abstract: A switching power supply with overvoltage protection includes a soft start circuit, a rectifying circuit, a filter capacitor, a main supply, an auxiliary supply and a monitoring circuit. When the input voltage is higher than the predetermined protection voltage, a first electric control switch is turned off, and the main power circuit of the switching power supply is shut off. At the moment, the actuation and release of the second electric control switch is controlled so as to control the input power supply to intermittently charge the power supply module such that the output voltage downstream of the rectifying circuit inside the power supply is controlled in a safe range. For instance, the second electric control is turned on when the output voltage is lower than a certain value, and is turned off when the output voltage is higher than a certain value.

Abstract: A switching power supply with overvoltage protection includes a soft start circuit, a rectifying circuit, a filter capacitor, a main supply, an auxiliary supply and a monitoring circuit. When the input voltage is higher than the predetermined protection voltage, a first electric control switch is turned off, and the main power circuit of the switching power supply is shut off. At the moment, the actuation and release of the second electric control switch is controlled so as to control the input power supply to intermittently charge the power supply module such that the output voltage downstream of the rectifying circuit inside the power supply is controlled in a safe range. For instance, the second electric control is turned on when the output voltage is lower than a certain value, and is turned off when the output voltage is higher than a certain value.