Patent ID: 9125265
Filing Date: 2015-09-01
Classification: H05B,Y02B

Abstract:
1. A control circuit for a light-emitting device, comprising: a rectification circuit rectifying an AC voltage to generate a rectified voltage; a switching device configured to turn on and off the light emitting device; a reference voltage generation circuit generating a reference voltage; a first comparator comparing a comparison voltage with the reference voltage, the comparison voltage corresponding to a current flowing through the light-emitting device in response to the rectified voltage; and a flip-flop configured to be set in response to a trigger pulse and reset in response to a result of comparison by the first comparator, the flip-flop outputting an output voltage and controlling the switching device in accordance with the output voltage, wherein the reference voltage generation circuit is configured so that a change in amplitude of the reference voltage is suppressed when amplitude of the AC voltage varies.