| 摘要 |
The present invention relates to a constant voltage power supply circuit of an LED and, more particularly, to a stable power supply circuit of an LED, capable of removing high frequency noises and an instantaneous transient voltage inputted to an input power terminal and preventing an excessive backward voltage from being generated in converter components. The constant voltage power supply circuit of the LED according to the embodiment of the present invention includes an EMI filter part, a bridge diode, a passive power factor improving unit, a constant voltage circuit part, a modulation control unit which controls the brightness of the LED and changes a width of a signal pulse wave according to a current sensing signal, a snubber part, and a pulsating current output terminal which rectifies a pulsating element again when the serial and parallel package of the LED is connected and a voltage is applied. |
