Tight tolerance zero crossing detector circuit

Details Tight tolerance zero crossing detector circuit Tight tolerance zero crossing detector circuit

1978-04-03

1980-10-21

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307252UA, 307311, H03K 5153

Patent

active

042296692

ABSTRACT:
A zero crossing detector provides an optically coupled output signal with a leading edge which occurs in the vicinity of the zero crossing point of an AC voltage waveform but no later than the zero crossing time. The circuit input includes a filter and rectifier. The filtered and rectified voltage is then applied to a complex impedance circuit with an input and an output, which provides an output lagging its input. A switching device, which may be a light emitting diode, is coupled between the output of the impedance circuit and the rectifier. Thus, when the lagging output voltage of the impedance circuit exceeds the output of the rectifier, the switching device conducts, producing the output signal.

REFERENCES:
patent: 3693027 (1972-09-01), Garaway
patent: 3862439 (1975-01-01), Coccio
patent: 4051394 (1977-09-01), Tieden

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