Abstract: A photovoltaic inverter may include a magnetic ring, a leakage current detection winding, a modulation wave circuit, a filter circuit, and a first direct current power supply. The modulation wave circuit includes a first push-pull circuit, a comparator, a second direct current power supply, and a leakage current sampling resistor. The first push-pull circuit includes a first switching transistor and a second switching transistor. The first switching transistor is turned on when the comparator outputs a first level signal. The second switching transistor is turned on when the comparator outputs a second level signal. The comparator outputs a carrier signal. When the leakage current detection winding is in a charging saturation status, a level signal output by the comparator is inverted.

Abstract: An inverter, including a connection structure and a first circuit board component, is provided. A part of the connection structure is located in a first cavity and is configured to connect to a photovoltaic module, a power grid, or a load, enabling direct current input and alternating current output. The first circuit board component is located in a second cavity and is electrically connected to the other part of the connection structure. The first circuit board component and the part of the connection structure are located in different cavities, so that separate cavity management can be implemented, and a fault risk of the first circuit board component can be reduced.

Abstract: A power converter and control method thereof are provided. A controller is configured to output a pulse signal. A noise signal conditioning circuit is configured to receive the pulse signal, and output a noise signal based on the pulse signal. A current transformer is configured to receive the noise signal and perform sampling, to output a sampled signal. A sampling signal conditioning circuit is configured to receive the sampled signal, and output a conditioned signal based on the sampled signal. The controller is further configured to: when an absolute value of a difference between a frequency of the conditioned signal and a frequency of the pulse signal is less than or equal to a frequency threshold, and a gain of the conditioned signal is greater than or equal to a gain threshold corresponding to the frequency of the pulse signal, control a power conversion circuit to start operating.

Abstract: A power converter that includes a housing and a power conversion circuit. A plurality of accommodation cavities separated from each other are disposed in the housing, and the plurality of accommodation cavities separated from each other include a first accommodation cavity, a second accommodation cavity, and a third accommodation cavity. The power conversion circuit includes a first electromagnetic compatibility module, a bus capacitor, and a second electromagnetic compatibility module. The first accommodation cavity is configured to accommodate the first electromagnetic compatibility module, the second accommodation cavity is configured to accommodate the bus capacitor, and the third accommodation cavity is configured to accommodate the second electromagnetic compatibility module. The first accommodation cavity and the third accommodation cavity are located on two sides of the second accommodation cavity. Accordingly, EMC of the power converter can be improved.

Abstract: A photovoltaic inverter may include a magnetic ring, a leakage current detection winding, a modulation wave circuit, a filter circuit, and a first direct current power supply. The modulation wave circuit includes a first push-pull circuit, a comparator, a second direct current power supply, and a leakage current sampling resistor. The first push-pull circuit includes a first switching transistor and a second switching transistor. The first switching transistor is turned on when the comparator outputs a first level signal. The second switching transistor is turned on when the comparator outputs a second level signal. The comparator outputs a carrier signal. When the leakage current detection winding is in a charging saturation status, a level signal output by the comparator is inverted.

Abstract: This application provides a photovoltaic inverter and a power control method. The photovoltaic inverter includes an inverter circuit, a plurality of voltage conversion circuits, a plurality of acquisition circuits, and a control circuit. The control circuit is configured to: when an input current of the target voltage conversion circuit is greater than or equal to the current threshold of the target voltage conversion circuit, control turn-on or turn-off of the switch in the target voltage conversion circuit to reduce a current or input power of the target voltage conversion circuit. According to this application, when the input current of the target voltage conversion circuit is greater than or equal to the current threshold of the target voltage conversion circuit, the input power of the voltage conversion circuit can be reduced to ensure power supply safety and improve stability and power supply efficiency of the photovoltaic inverter.