DIMMING DEVICE
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United States of America Patent
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N/A
Issued Date -
Jan 19, 2017
app pub date -
Mar 5, 2015
filing date -
Mar 11, 2014
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A determiner determines whether an illumination load is an LED illumination device or an incandescent lamp, based on a voltage of a rectifier within a time period from start of supply of the AC voltage to the rectifier to a time a predetermined time elapses. A control circuit controls a driver under a condition where values of a conduction angle of a switch corresponding to magnitudes of the first DC voltages except a maximum and a minimum thereof in a case where the determiner determines that the illumination load is the LED illumination device are smaller than values of the conduction angles of the switch of a case where the determiner determines that the illumination load is the incandescent lamp.
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