Input circuit
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United States of America Patent
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Nov 28, 2006
Grant Date -
May 12, 2005
app pub date -
Nov 3, 2004
filing date -
Nov 10, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An input circuit has a first current-limiting resistor, a second current-limiting resistor, and an AC-input photocoupler. The photocoupler has an input terminal connected to a first external terminal and another input terminal connected to a positive electrode through the first current-limiting resistor and also to a ground electrode through the second current-limiting resistor. The first external terminal is connected to a PNP transistor and NPN transistors.
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