Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-09-24
1993-01-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214C, G08C 2100
Patent
active
051824485
ABSTRACT:
A light receiving section of a photocoupler according to the present invention has, for example, a light receiving element, a converting circuit, an oscillator, an updown (U/D) counter, a decoder and a clock signal supply control circuit, and those devices are monolithically integrated therein. When the light receiving element receives light from a light generating section, an output of the converting circuit becomes High. At this time, an output of the decoder is delayed until the U/D counter has counted up to the preset number a clock signal supplied by the clock signal supply control circuit. On the other hand, upon having Low of the output of the converting circuit, the output of the decoder is delayed until the U/D counter has counted down to "0" the clock signal supplied by the clock signal supply control circuit. Therefore, even in the case where noise interferes the output of the converting circuit, since the output of the decoder is delayed until the count value of the U/D counter has reached the preset number or "0" in spite of switching of the operation of the U/D counter, it is not adversely affected by the noise. This results in improved anti-noise characteristics of the photocoupler.
REFERENCES:
patent: 3913001 (1975-10-01), Kayama
patent: 4140914 (1979-02-01), Jones
patent: 4178504 (1979-12-01), Farmer
patent: 4713534 (1987-12-01), Masters et al.
patent: 4714827 (1987-12-01), Akita
patent: 4739174 (1988-04-01), Nagano
patent: 4799044 (1989-01-01), Masters et al.
patent: 5043587 (1991-08-01), Miki et al.
Masuda Yoshifumi
Ohtsuka Yoshihiro
Allen Stephone B.
Nelms David C.
Sharp Kabushiki Kaisha
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