Charge and weld gating system with safety circuit

Details Charge and weld gating system with safety circuit Charge and weld gating system with safety circuit

2007-12-11

2007-12-11

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

For bonding with pressure

Reexamination Certificate

active

11292862

ABSTRACT:
A weld circuit for use in a welder is provided. The weld circuit comprises a charge section, a capacitor section, and a weld section. The charge section includes a first plurality of solid state switches, e.g., silicon controlled rectifiers (charge SCRs), the capacitor section includes a weld capacitor, and the weld section includes a second plurality of solid state switches, e.g., silicon controlled rectifiers (weld SCRs). The charge SCRs form a bridge between the lines in the charge circuit. One weld SCR is coupled to a first weld terminal and the other weld SCR is coupled to a second weld terminal. The charge and weld SCRs isolate the charge section, the capacitor section, and the weld section from each other. The weld circuit is coupleable to a safety circuit that comprises a resistor, a microcontroller, and optical isolators. When the optical isolators are enabled, the microcontroller monitors a current flowing through the resistor.

REFERENCES:
patent: 3609281 (1971-09-01), Kauffman et al.
patent: 5424588 (1995-06-01), Cantor et al.
patent: 6177645 (2001-01-01), Church et al.
patent: 6455802 (2002-09-01), Watanabe
patent: 2004/0145853 (2004-07-01), Sekoguchi et al.
patent: 0913224 (1999-05-01), None
PCT International Search Report.

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