Safety shutdown apparatus with self-driven control, power supply system, and method of controlling the same

A safety shutdown apparatus with self-driven control coupled to a power-supplying path between a power supply apparatus and a load, the safety shutdown apparatus comprising:

• a detection unit coupled to the power-supplying path, and configured to generate a current confirmation signal according to a current flowing through the power-supplying path,
• a controllable switch coupled between a positive node and a negative node of the power-supplying path, and configured to provide a short-circuit path passing through the positive node, the controllable switch, and the negative node, and
• a drive circuit coupled to the detection unit, the power-supplying path, and the controllable switch, and configured to receive an output voltage provided from the power supply apparatus to turn on the controllable switch, and configured to turn off the controllable switch according to the current confirmation signal, and the drive circuit comprises:
• a first switch coupled to the detection unit, and being turned on by receiving the current confirmation signal provided by the detection unit, and being turned off by a no-load signal provided by the detection unit when the current is not detected by the detection unit, and
• a regulation circuit coupled to the first switch and the controllable switch, and configured to generate a first voltage according to the first switch which is turned on and generate a second voltage according to the first switch which is turned off,
• wherein the regulation circuit coupled in parallel with the controllable switch, and having a first end and a second end, and the regulation circuit has:
• a first resistor and a regulation unit connected in series, and
• a node between the first resistor and the regulation unit coupled to the first switch and the controllable switch,
• wherein the controllable switch is configured to receive the first voltage to disconnect the short-circuit and connect the short-circuit path according to the second voltage,
• wherein the first end of the regulation circuit is directly coupled to the positive node, and the second end of the regulation circuit is directly coupled to the negative node, and
• wherein when the load is drawn the current, the detection unit detects the current and generates the current confirmation signal to drive the first switch to be turned on, and the first switch is turned on so that the first voltage is generated at the node, the controllable switch is turned off by the first voltage such that the controllable switch is in an open-circuit condition.