Arc extinguishing control system and method for relay of emergency power supply

An arc extinguishing control system for a relay of an emergency power supply, comprising:

• a power supply line (10), one side thereof being provided with a first port (11) for connecting a battery, and the other side being provided with a second port (12) for connecting a load;
• a relay (20), an input terminal thereof being connected to the first port (11) and an output terminal thereof being connected to the second port (12) for turning on and off the power supply line (10);
• an electronic switch tube (30) connected in parallel between the input terminal and the output terminal of the relay (20);
• a control module (40) being used for respectively connected to a control end of the relay (20) and a control end of the electronic switch tube (30) in a controllable mode, so that the electronic switch tube (30) can withstand changes in voltage generated from the disconnection of the relay (20);
• a reverse charging induction circuit (51) used for inducing a reverse voltage applied from the output terminal to the input terminal of the relay (20);
• and
• a reverse charging feedback circuit (52) used for feeding back the induced reverse voltage to the control end of the electronic switch tube (30) through voltage reduction, so as to control the electronic switch tube (30) to be disconnected when a reverse current occurs.