Capacitor type welding power unit

Details Capacitor type welding power unit Capacitor type welding power unit

1989-02-15

1990-10-23

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

320 1, B23K 1126

Patent

active

049658603

ABSTRACT:
A capacitor type welding power unit incorporates a constant-current charging control circuit which serves to control a charging current being supplied to a capacitor so as to be substantially constant during the charging. By such a control circuit, which typically performs a thyristor firing control, the charging voltage of the capacitor is made to follow a reference signal, which is preferably set to change linearly with time, and it reaches a preset target value in a predetermined time regardless of fluctuations in the supply voltage. Furthermore, such a control circuit enables the capacitor to be directly connected to the output terminals of a rectifier circuit with no charging resistor being provided so as to reduce resistance heating and so as to lower power consumption in charging the capacitor.

REFERENCES:
patent: 4228340 (1980-10-01), Dufrenne
patent: 4464556 (1984-08-01), Krufka
patent: 4736149 (1988-04-01), van den Eijnden

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