Patent ID: 8410391

Claim:
A weld current generating apparatus, comprising: a voltage conversion circuit capable of receiving an AC voltage from an AC voltage input terminal, and converting the AC voltage to a DC voltage; wherein the AC voltage input terminal comprises a live wire terminal and a neutral wire terminal; the voltage conversion circuit comprises a first diode, a second diode, a third diode, a fourth diode, a Zener diode, a first resistor, and a first capacitor; a first diode cathode is electrically coupled to a third diode anode; a first diode anode is electrically coupled to a second diode anode; a second diode cathode is electrically coupled to a fourth diode anode; a fourth diode cathode is electrically coupled to a third diode cathode; a connection point between the third and the fourth diode is electrically coupled to a Zener diode cathode via the first resistor; a Zener diode anode is grounded; a connection point between the first and the second diode is electrically coupled to the Zener diode anode; and the Zener diode cathode is capable of outputting the DC voltage; a control circuit capable of receiving the DC voltage, wherein the control circuit is capable of setting a weld time, and outputting a control signal for controlling the weld time; the control circuit comprises a comparator, a transistor, a first relay, a second relay, a press stopper, a first variable resistor, a second resistor, a third resistor, a second capacitor, and a third capacitor; the first relay comprises a first winding, a first normally open contact, and a first normally closed contact; and the second relay comprises a second winding and a second normally closed contact; a switch circuit capable of receiving the control signal, and turning on for the duration of the weld time according to the control signal; a current output circuit capable of outputting a continuous weld current when the switch circuit turns on; a first fuse and a second fuse; and a linked switch comprising a first switch and a second switch; wherein the live wire terminal is electrically coupled to a first fuse first terminal via the first switch; the neutral wire terminal is electrically coupled to a second fuse first terminal via the second switch; a connection point between the first and the third diode is electrically coupled to a first fuse second terminal via the first capacitor; and a connection point between the second and the fourth diode is electrically coupled to a second fuse second terminal.