Power Control Circuit of Photo Coupler
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United States of America Patent
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Issued Date -
Apr 22, 2010
app pub date -
May 28, 2009
filing date -
Oct 20, 2008
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A power control circuit of photo coupler mainly includes a plurality of impedances having one end connected in parallel with a pin of a photo coupler and the other end connected with a relative control pin of an integrated circuit, in which the values of the plural impedances are chosen in a class-by-class pattern on a basis of impedance value to increase or decrease a total impedance value class by class in a range by varying a high impedance or low output via the relative control pin of the IC. As such, the combined circuit is simplified and practical and achieves an effect taking cost and precise adjustment into account to possess digital adjustment of impedance range without spending a lot.
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