LAMP POWER CONTROL CIRCUIT

摘要

The brightness of a lamp is controlled according to the surrounding luminance and closeness of a man. The power controller includes an IR detector(1) for detecting closeness of a man with an IR sensor, an amplifier(2) for amplifying output signal of the IR detector(1), a delay(3) for delaying output signal of the amplifier(2), a luminance sensor(4) for detecting the surrounding luminance by using a cds cell, a comparator(5) for selecting lower power drive signal or normal power drive signal according to output signal of the delay(3) and the luminance sensor(4) and a lamp driver(6) for controlling a power supplied to a lamp according to drive signal transmitted from the comparator(5).