Hard-firing zero-crossing trigger control circuit

Details Hard-firing zero-crossing trigger control circuit Hard-firing zero-crossing trigger control circuit

1975-11-04

1977-05-17

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

307252UA, 323 21, 323 24, 323 38, 361 6, G05F 500, H03K 1760

Patent

active

040244571

ABSTRACT:
Presented is an electronic circuit composed of various cooperating semiconductor-type devices controlling the degree and timing of triggering of a power switching device to effect controlled electrical conduction through the device. The circuit achieves a "zero-voltage-switch" (ZVS) function where the triggering of the power switching device can occur only during an interval when the main power terminal voltage is less than a predetermined value. The circuit comprises a high-voltage current limiting resistor comprised of a depletion MOSFET or JFET device used as a current limited source to drive other transistor amplifiers and switching circuits, the means of diverting this limited current through application of an external control signal separate from the power terminals, and a means of providing a limited source voltage to the external control means for use if required.

REFERENCES:
patent: 3335360 (1967-08-01), Reinert
patent: 3506852 (1970-04-01), De Hart
patent: 3577177 (1971-05-01), Hewlett, Jr.
patent: 3848140 (1974-11-01), Guermeur et al.
patent: 3917962 (1975-11-01), Pascente

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