Patent ID: 9730290
Date: 2017-08-08
CPC Classifications: H05B

Claim:
1. A dimmable alternating current (AC) driven light emitting diode (LED) illuminating apparatus comprising: a rectifying unit configured to full-wave rectify controlled AC power to generate a driving voltage; a dimming level detecting unit configured to detect a selected dimming level and output a detected dimming level signal; LED groups that each comprise at least one LED; and an LED driving module configured to detect a voltage level of the driving voltage and sequentially drive the LED groups according to the detected voltage level, by constantly controling an LED driving current applied to a driven LED group, based on the dimming level signal, wherein the LED driving module comprises an automatic sensing circuit configured to determine whether a dimming circuit is connected, to automatically select whether a dimming control function is enabled or disabled, wherein the LED driving module determines a reference value of the LED driving current in proportion to a magnitude of the dimming level signal and controls a maximum value of the LED driving current based on the determined reference value.