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 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: An energy storage system. A control unit is configured to: when a voltage of an energy storage unit is greater than a voltage peak of an end that is of a power conversion system and that is configured to connect to a grid connection point, control a switching transistor to be turned-on, so that a DC/DC conversion circuit stops working. The power conversion system is configured to charge or discharge the energy storage unit by using the switching transistor. The control unit is configured to: when the voltage of the energy storage unit is less than the voltage peak of the end that is of the power conversion system and that is configured to connect to the grid connection point, control the switching transistor to be turned off, to charge or discharge the energy storage unit by using the DC/DC conversion circuit and the power conversion system.

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: In an energy storage system, a battery cluster is connected to a battery cluster control circuit, the battery cluster control circuit is connected to one end of a first power conversion circuit, the first power conversion circuit is configured to connect to a power grid or a load, and a first detection circuit is disposed between the first power conversion circuit and the power grid or the load. When the first detection circuit detects that a leakage current of the energy storage system is greater than a preset safety threshold, a controller controls the battery cluster control circuit and the first power conversion circuit to be disconnected. After controlling the battery cluster control circuit and the first power conversion circuit to be disconnected, the controller controls the battery cluster control circuit to be connected, and sends alarm information indicating that a leakage current fault occurs in the battery cluster.

Abstract: An energy storage cabinet. An additional power converter is added between an energy storage apparatus and an air conditioning system, in order to meet a power supply requirement of the air conditioning system in a case of a low voltage ride-through and an off-grid black start. In the case of the low voltage ride-through and the off-grid black start, the power converter converts electric energy of the energy storage apparatus to supply power to the air conditioning system. After a voltage of a power grid is normal or a start is completed, a conversion circuit in the air conditioning system is configured to obtain power from the power grid.

Abstract: A power converter and a control method. When the power converter runs in the first mode, a peak current flowing through an inductor is higher, and a switching frequency of the switching component is lower; or when the power converter runs in the second mode, a peak current flowing through an inductor is lower, and a switching frequency of the switching component is higher. When an output power of the power converter is less than a first specified power, a current output by the power converter is small, and the power converter runs in the first mode; or when an output power of the power converter is greater than or equal to a first specified power, a current output by the power converter increases, and the power converter runs in the second mode.

Abstract: An energy storage cabinet includes a battery rack and a power conversion system. A switch unit is connected between a battery unit and the power conversion system. A first end of the power conversion system is connected to a bus. When an energy storage cabinet in the energy storage system is started, a voltage at the first end of the power conversion system is greater than a first preset voltage. The power conversion system in the to-be-started energy storage cabinet may obtain, through the first end, a voltage output by the started energy storage cabinet, convert the voltage into a target voltage, and then supply power to the start unit. After obtaining the power, the start unit controls the switch unit to be turned on. The battery unit may output stored electric energy through the power conversion system, to start the energy storage cabinet.

Abstract: A power conversion apparatus may include a direct current-direct current conversion circuit and a controller. The direct current-direct current (DC-DC) conversion circuit may include a full-bridge circuit, the full-bridge circuit includes a first bridge arm and a second bridge arm that are connected in parallel, and each of the bridge arms includes an upper bridge arm switch and a lower bridge arm switch that are connected in series. The controller controls turn-on/off of the upper bridge arm switch and the lower bridge arm switch of each of the bridge arms based on a voltage of a first connection point between the upper bridge arm switch and the lower bridge arm switch in the first bridge arm and a voltage of a second connection point between the upper bridge arm switch and the lower bridge arm switch in the second bridge arm.

Abstract: An energy storage system includes an electrochemical cell pack, a startup circuit, and an auxiliary source circuit. The startup circuit includes a first control circuit and a second control circuit, the second control circuit includes a first voltage divider circuit and a second voltage divider circuit that are connected in series, the first voltage divider circuit includes a switching device and a voltage divider that are connected in series, and a connection point between the first voltage divider circuit and the second voltage divider circuit is connected to a first control end of the first control circuit. When the switching device is turned on, a voltage of the electrochemical cell pack needs to meet a specified condition, and the first control circuit turns on a line between the electrochemical cell pack and the auxiliary source circuit, to enable the battery pack to supply power to the auxiliary source circuit.

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: 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.