Safe circuit of connector

A circuit mounted in a housing of a connector for safely supplying an electric power provided by a first power source to a power-receiving device, comprising:

• a sensor mounted in said housing for sensing a first electric signal released from said power-receiving device and a second electric signal from a second power source disposed in said connector respectively, and generating a first control signal and a second control signal correspondingly;
• and
• a switch mounted in said housing and electrically connected to said first power source, said power-receiving device and said sensor respectively for switching on/off a communication channel between said first power source and said power-receiving device in response to said first control signal and said second control signal respectively;
• wherein said connector further comprises a first conducting element electrically connected between said sensor and said power-receiving device for transmitting said first electric signal to said sensor, and a second conducting element electrically connected between said switch and said power-receiving device for transmitting said electric power to said power-receiving device.