Photovoltaic charging circuit preventing PV inversed connection and improving charging efficiency

The utility model discloses a photovoltaic charging circuit preventing PV inversed connection and improving charging efficiency. The circuit is characterized in that the photovoltaic charging circuit is connected with a diode D1 and a relay K1 which are connected in parallel to prevent PV inversed connection. Since the structure that the diode D1 and the relay K1 connected in parallel is used, at night or in cloudy day, when power of photovoltaic charging is lower than a preset charging power value, the relay K1 is disconnected, the current flows through the diode D1, preventing a problem that the relay switches frequently. In sunny day, when power of photovoltaic charging reaches the preset charging power value, the relay K1 is closed to make the diode D1 in short circuit. Thus, a problem of loss of the diode in larger power is prevented, and meanwhile charging efficiency is improved.