US 4,392,046 AGranted

Electronic device for arc welding equipment

OwnerHuann-Jang Tzenginventor

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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.

Claims4

Dependent claims

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.

Dependencies are inferred from the claim text.