Protective circuit for photovoltaic battery pack

The utility model discloses a protective circuit for a photovoltaic battery pack. The protective circuit includes a charge pump, a charge pump protector, and a photovoltaic battery pack bypass switch, the charge pump protector and the photovoltaic battery pack bypass switch are electrically connected on the charge pump, the charge pump is electrically connected with the photovoltaic battery pack bypass switch, the charge pump is composed of a converter U1 and a capacitor C1, the VSS end of the converter U1 is grounded, the CPC+ end of the converter U1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is grounded. Through the cooperation of the charge pump with the charge pump protector and the photovoltaic battery pack bypass switch, the heating power consumption of a circuit can be controlled at a lower level, thereby preventing the pack from being damaged because of the heating of the circuit, and improving the reliability of the photovoltaic battery pack.