Single-wired switching circuit directed to limit surge into lamp
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United States of America Patent
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Aug 8, 1989
Grant Date -
N/A
app pub date -
Jan 27, 1988
filing date -
Feb 9, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a novel switching circuit directed to use for limiting surge into lamp, comprising a diode circuit wherein two sets of diodes are connected in reverse-parallel; a resistive element connected in series with a lamp to limit the switch-on surge thereinto; a bidirectionally conductive element having a main current path connected in seried with an ac source through said resistive element, diode circuit and lamp; and a timing circuit having a time constant, said timing circuit triggering said bidirectionally conductive element with the voltage across said diode circuit to short-circuit said resistive element after a lapse of said time constant from switch-on.
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