FLUCTUATION SIGNAL GENERATING APPARATUS, DRIVING CIRCUIT, AND LIGHTING APPARATUS

摘要

PROBLEM TO BE SOLVED: To generate fluctuation signal, which does not depend on the environmental temperature but reflects fluctuation component of the temperature correctly. SOLUTION: The fluctuation signal generating circuit 2 includes a first thermocouple 3, a second thermocouple 4 with response speed slower than that of the first thermocouple 3, and a differential amplifier 5 outputting the difference between output of the first thermocouple 3 and output of the second thermocouple 4 as a fluctuation signal. COPYRIGHT: (C)2010,JPO&INPIT