# US 4,392,046 A · Electronic device for arc welding equipment

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- Number: US 4,392,046 A
- Document ID: US4392046A
- Status: Granted
- Kind: A
- Application number: 06/247,867
- Filed: 1981-03-26
- Granted: 1983-07-05
- Earliest claimed: 1981-03-26
- Inventors: Huann-Jang Tzeng
- Web page: https://patentgrep.com/patent/US4392046A

## CPC

- B23K 9/1006: {Power supply}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

The present invention concerns an electronic voltage regulating device applied to electrical appliances, and more particularly, arc welding equipment comprising a voltage regulating portion having two SCRs alternately turned on and off by a controlling portion having a RC circuit, a DIAC and a TRIAC which is operationally characterized by the DIAC being triggered during each half cycle when the capacitor is charged to a predetermined potential by the application of alternating current, the DIAC then triggering the TRIAC, which in turn enables the gate of one of the two SCRs in each half cycle to turn the SCR on and allow current to pass through the load for the remainder of the half cycle, thus controlling the operable power by means of controlling the conducting phase angle through the adjustment of the RC value or the choice of the DIAC.

## Claims

### Claim 1

An electronic device for arc welding equipment having a load arc, comprising; a voltage regulating portion, and a controlling portion which controls said voltage regulating portion; said voltage regulating portion comprising two thyristors electrically connected to allow a first half cycle of alternating current to pass through one of the two thyristors and a second half cycle of said alternating current to pass through the other of said thyristors under the control of said controlling portion; said controlling portion comprising a RC circuit having a capacitor, changeable resistance, a DIAC, and a TRIAC in electrical connection with said voltage regulating portion such that the application of alternating current will first charge the capacitor of said RC circuit to a potential sufficient to trigger said DIAC which in turn triggers said TRIAC, said TRIAC in turn causing said thyristors to be alternately rendered conductive during alternate half-cycles.

### Claim 2 (depends on 1)

The electronic device defined by claim 1, wherein the gates of said thyristors are directly connected to said controlling portion and said thyristors are connected in parallel with their cathodes and anodes disposed in opposing relationship.

### Claim 3 (depends on 1)

The electronic device defined by claim 1, said voltage regulating portion further including a plurality of diodes operatively connected to form a bridge circuit, whereby the electronic device is adopted for use with direct current welding equipment.

### Claim 4 (depends on 1)

The electronic device defined by claim 1 wherein said thyristors are SCRs each having an anode, a cathode and a gate, said TRIAC having a gate and two non-gate terminals, said SCRs being connected to each other in reverse parallel relationship with the anode and cathode of each SCR in serial connection with said load arc, the gates of said SCRs being connected to the TRIAC at different non-gate terminals thereof, the gate of said TRIAC being connected to said DIAC to have the TRIAC rendered conductive when the DIAC is rendered conductive, whereby changing of said capacitor of said RC circuit to the breakover voltage of said DIAC renders said DIAC conductive during each half cycle of alternating current applied to said device.