Switch identification circuit and electric device

An electric device, comprising:

• a load;
• a power-supply device, electrically coupled with the load, and configured to drive the load to start when the power-supply device and the load form a conductive loop;
• and
• a switch identification circuit, electrically coupled with the power-supply device, and comprising a detecting unit, a control unit, a connection unit, a first connection terminal, and a second connection terminal, wherein
• the detecting unit comprises a first detecting unit electrically coupled with the first connection terminal and a second detecting unit electrically coupled with the second connection terminal, and the detecting unit is configured to output a detection signal by detecting a voltage at the first connection terminal through the first detecting unit and detecting a voltage at the second connection terminal through the second detecting unit;
• the control unit is electrically coupled with the first detecting unit, the second detecting unit, and the connection unit, and is configured to receive the detection signal and determine whether the first connection terminal and the second connection terminal are short-circuited according to the detection signal;
• the power-supply device is configured to supply a driving voltage to the first connection terminal and the second connection terminal;
• the control unit is configured to output a connection-enabling signal to the connection unit on condition that the first connection terminal and the second connection terminal are short-circuited, to make the connection unit control the power-supply device to stop supplying the driving voltage;
• and
• wherein the second detecting unit comprises a first input terminal, a first output terminal, a Zener diode, a capacitor, and a second transistor, wherein
• an anode of the Zener diode is electrically coupled with a ground terminal, and a cathode of the Zener diode is electrically coupled with the first output terminal;
• the first output terminal is electrically coupled with the control unit, and is configured to output a first detection signal before the second detecting unit enters a current detection state and output a current signal when the second detecting unit enters the current detection state;
• the capacitor is electrically coupled between the ground terminal and the first output terminal;
• a fifth resistor is electrically coupled between a voltage dividing node and the first output terminal, a sixth resistor is electrically coupled between the voltage dividing node and the ground terminal, and a seventh resistor is electrically coupled between the voltage dividing node and the first input terminal;
• the first input terminal is electrically coupled with an identification unit of the switch identification circuit and the connection unit and configured to receive a second identification signal and the current signal;
• and
• a source of the second transistor is electrically coupled with the first input terminal, a drain of the second transistor is electrically coupled with the voltage dividing node, and a gate of the second transistor is electrically connected with the control unit via an eighth resistor.