Patent ID: 8203234

Claim:
A power safety system, comprising: a power input to be connected with a power supply; a power output to be connected to a load system; a first MOS transistor formed on a body, connected between the power input and the power output, and having a source, a drain, and a gate; an amplifier connected to the power input, the power output, and the gate of the first MOS transistor, and configured to determine a first control signal according to a voltage at the power input and a voltage at the power output, to be applied to the gate of the first MOS transistor; a charging output end to be connected to a battery; a second MOS transistor connected between the power output and the charging output, and having a gate; a power management device connected to the charging output and the gate of the second MOS transistor, and configured to monitor a voltage at the charging output to determine a second control signal to be applied to the gate of the second MOS transistor, thereby controlling a charging current flowing to the charging output; a body controller connected to the power input, the power output, and the body of the first MOS transistor, and configured to determine a third control signal according to the voltage at the power input and the voltage at the power output; and a switch having an end connected to the body of the first MOS transistor and an opposite end to be switched between the source and the drain of the first MOS transistor in response to the third control signal.