Large-current over-current and over-voltage protection circuit

The utility model discloses a heavy-current over-current and over-voltage protection circuit, which comprises a filter circuit connected with a power supply, the output end of the filter circuit is connected with an anti-reverse connection circuit, and the rear end of the anti-reverse connection circuit is connected with a post-stage circuit through an over-voltage protection circuit. According to the utility model, when the current exceeds the bearing capacity of the self-recovery fuse, the self-recovery fuse is automatically disconnected to realize large-current over-current protection; when the input voltage exceeds a set overvoltage protection threshold value, a circuit loop is blocked through switching between a conduction state and a cut-off state between the triode and the MOS tube, so that circuit overvoltage protection is realized; the reverse connection prevention of the circuit is realized through the circuit break of the MOS tube, and the MOS tube is small in internal resistance and less in heat p