Zero-crossing point detection circuit

Details Zero-crossing point detection circuit Zero-crossing point detection circuit

2007-06-20

2008-10-14

Lee, John R (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Signal isolator

C323S235000, C327S451000

Reexamination Certificate

active

07435985

ABSTRACT:
A zero-crossing point detection circuit includes a hot line input, a neutral line input, a first zero-crossing point output, and a first optical coupler. The first optical coupler includes a first light-emitting diode (LED) and a first optical transistor. The hot line input and neutral line input are respectively connected to two terminals of the first LED. An emitter of the first optical transistor is grounded. A collector of the first optical transistor is connected to a direct current (DC) power source. The collector of the first optical transistor is also connected to the first zero-crossing point output.

REFERENCES:
patent: 4480200 (1984-10-01), Tan et al.
patent: 4495461 (1985-01-01), Gilliam
patent: 4804923 (1989-02-01), Black
patent: 5239209 (1993-08-01), Hockman
patent: 5506573 (1996-04-01), Ewing et al.
patent: 5652503 (1997-07-01), Urban et al.
patent: 6049284 (2000-04-01), Heuer
patent: 2007/0007826 (2007-01-01), Mosebrook et al.

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