Abstract: A charging circuit includes at least two groups of DC/DC converters, at least one group of relay switches, and at least one diode that are mutually coupled. The relay switch is configured to connect the at least two groups of DC/DC converters in series when a first voltage is in a first threshold range. The first voltage is a charging voltage of an electric vehicle. The relay switch is further configured to connect the at least two groups of DC/DC converters in parallel when the first voltage is in a second threshold range. The diode is configured to prevent a current of a storage battery in the electric vehicle from flowing back. In embodiments of this application, a volume of a charging apparatus can be reduced.

Abstract: An inverter, a photovoltaic power generation system, and a dehumidification method. The inverter includes a ventilation valve and a pneumatic transmission device. The ventilation valve is installed on a surface of a cabinet compartment of the inverter. A controller and the pneumatic transmission device are located in the cabinet compartment. A breathable film is disposed on the ventilation valve. The pneumatic transmission device blows air in the cabinet compartment toward the breathable film when the following at least one preset condition is met. The at least one preset condition includes at least one of or more of the following cases: the inverter is running, humidity in the cabinet compartment is higher than preset humidity, and a temperature in the cabinet compartment is higher than a preset temperature.

Abstract: A power supply circuit includes a first input end (IN1), a second input end (IN2), a first output end (OUT1), and a second output end (OUT2). An input end of a first voltage conversion circuit (VCC) is used as IN1 and connected to an output end of a solar panel. A first output end of the first VCC is used as OUT1 and connected to a first power supply end of a monitoring chip. A second output end of the first VCC is connected to an input end of an energy storage module. An input end of the rectifier circuit is used as IN2 and connected to an AC power network. An output end of the rectifier circuit is connected to an input end of a second VCC. An output end of the second VCC and an output end of the energy storage module are used as OUT2 and connected to a second power supply end of the monitoring chip.

Abstract: This application discloses a boost power conversion circuit, a method, an inverter, an apparatus, and a system. In the conversion circuit, a voltage control circuit is added on a three-level boost. The voltage control circuit can be connected in series in a third closed loop, and the third closed loop is a loop including an inductor, a first switching transistor, a flying capacitor, a second diode, and an input end. The voltage control circuit clamps a voltage of a common point of the first diode and the second diode when a voltage on an input end of the boost power conversion circuit is less than a startup voltage of the boost power conversion circuit. The voltage borne by the second diode is reduced, so that a diode with relatively small voltage stress can be selected.

Abstract: This application discloses a boost power conversion circuit, a method, an inverter, an apparatus, and a system. In the conversion circuit, a voltage control circuit is added on a three-level boost. The voltage control circuit can be connected in series in a third closed loop, and the third closed loop is a loop including an inductor, a first switching transistor, a flying capacitor, a second diode, and an input end. The voltage control circuit clamps a voltage of a common point of the first diode and the second diode when a voltage on an input end of the boost power conversion circuit is less than a startup voltage of the boost power conversion circuit. The voltage borne by the second diode is reduced, so that a diode with relatively small voltage stress can be selected.

Abstract: A power supply circuit includes a first input end (IN1), a second input end (IN2), a first output end (OUT1), and a second output end (OUT2). An input end of a first voltage conversion circuit (VCC) is used as IN1 and connected to an output end of a solar panel. A first output end of the first VCC is used as OUT1 and connected to a first power supply end of a monitoring chip. A second output end of the first VCC is connected to an input end of an energy storage module. An input end of the rectifier circuit is used as IN2 and connected to an AC power network. An output end of the rectifier circuit is connected to an input end of a second VCC. An output end of the second VCC and an output end of the energy storage module are used as OUT2 and connected to a second power supply end of the monitoring chip.

Abstract: This application discloses a boost power conversion circuit, a method, an inverter, an apparatus, and a system. In the conversion circuit, a voltage control circuit is added on a three-level boost. The voltage control circuit can be connected in series in a third closed loop, and the third closed loop is a loop including an inductor, a first switching transistor, a flying capacitor, a second diode, and an input end. The voltage control circuit clamps a voltage of a common point of the first diode and the second diode when a voltage on an input end of the boost power conversion circuit is less than a startup voltage of the boost power conversion circuit. The voltage borne by the second diode is reduced, so that a diode with relatively small voltage stress can be selected.