Power supply system with self-excited drive function

A power supply system with self-excited drive function coupled to a power receiving apparatus through a positive power wire and a negative power wire, the power supply system comprising:

• a power supply apparatus configured to output a DC power source between the positive power wire and the negative power wire,
• a logic disconnection circuit coupled between the positive power wire and the negative power wire,
• a self-boosting circuit coupled between the positive power wire and the negative power wire, and configured to convert a voltage between the positive power wire and the negative power wire into an auxiliary voltage, and a receiving end of the self-boosting circuit coupled to an output end of the logic disconnection circuit,
• a protection circuit coupled between the positive power wire and the negative power wire, and coupled to the self-boosting circuit to receive the auxiliary voltage, and
• a current sensing unit coupled to the positive power wire or the negative power wire, and configured to output a current sensing signal according to a current flowing through the positive power wire or the negative power wire,
• wherein the protection circuit makes a short circuit or an open circuit between the positive power wire and the negative power wire according to the current sensing signal, and the logic disconnection circuit disables or enables the self-boosting circuit according to the voltage between the positive power wire and the negative power wire.