A transformer thermal protection circuit for off-grid photovoltaic energy storage inverter

Abstract

A transformer thermal protection circuit for off-grid photovoltaic energy storage inverter, including input module, resonance module, transformer, temperature sampling module and output module, the transformer includes primary side and secondary side, the output end of the input module is connected with the transformer primary side, the temperature sampling module is arranged in the transformer, and the internal temperature signal of the transformer is collected in real time, the input module is used for controlling the conduction and shutdown of the circuit, the resonance module is used for filtering out the direct current component in the conduction and shutdown process of the input module, and the output module is used for rectifying the alternating current output by the resonance module. The utility model discloses an embodiment through resonance module filtering out direct current component, balancing the time difference of two arms conduction, inhibiting transformer magnetic bias phenomenon, make the circuit work in inductive state, realize zero voltage switch conduction.