Zero-voltage crossing detector for soft-switching devices

Details Zero-voltage crossing detector for soft-switching devices Zero-voltage crossing detector for soft-switching devices

1991-08-07

1992-11-24

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 363 89, 363 97, 323235, H03K 5153, H03K 1713

Patent

active

051665492

ABSTRACT:
A zero-voltage crossing detector includes a transistor circuit in combination with comparator circuitry for determining when the voltage across a soft-switching device crosses zero. The transistor circuit includes a series combination of a detector transistor and a source, or emitter, load resistance coupled across the soft-switching device. The gate, or base, of the transistor is coupled via a resistive voltage divider to a dc supply. The source, or emitter, of the transistor is coupled to the comparator circuitry for comparing the voltage across the load resistance to a zero-voltage reference. During intervals when the voltage across the soft-switching device is greater than the input voltage to the detector transistor, the detector transistor is off, causing the output of the transistor circuit to equal the input voltage. Othewise, the detector transistor is active and the output voltage equals the voltage across the soft-switching device, so that the comparator circuitry generates signals to indicate the zero-voltage crossings.

REFERENCES:
patent: 3590275 (1971-06-01), Fisher
patent: 5072143 (1991-12-01), Gantioler et al.

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