| 摘要 |
<p>PURPOSE: A power control device for an LED lamp is provided to vary the level of a voltage or the amount of currents supplied to an LED according to a heating temperature of an LED, thereby maintaining the optimal light feature of an LED. CONSTITUTION: A first FET(11) converts an AC voltage outputted from the secondary coil(L2) of a transformer(T1) into a purpose level. A condenser(C1) smoothes a voltage outputted from the first FET. A load(13) is made of LEDs which are turned on by a DC voltage supplied through the condenser. An output sensing unit(12) senses the level of a voltage or the amount of currents supplied to a load. A PWM controller(15) controls an output voltage level or an output current amount according to the level or the amount.</p> |
