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Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof

  • US 8,710,755 B2
  • Filed: 03/15/2012
  • Issued: 04/29/2014
  • Est. Priority Date: 03/22/2011
  • Status: Active Grant
First Claim
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1. A light emitting device driver circuit for driving a light emitting device circuit according to a rectified dimming signal, wherein the rectified dimming signal is generated from an AC input signal which passes through a tri-electrode AC switch (TRIAC) dimming circuit and a rectifier circuit, the light emitting device driver circuit comprising:

  • a power stage circuit coupled between the rectifier circuit and the light emitting device circuit, the power stage circuit operating at least one power switch therein according to a switch control signal to generate a latching current for firing the TRIAC dimming circuit, wherein the latching current flows through the light emitting device circuit; and

    a light emitting device control circuit coupled to the power stage circuit, the light emitting device control circuit generating the switch control signal according to a detection signal;

    wherein the detection signal is generated according to the rectified dimming signal or a signal related to the rectified dimming signal, and the detection signal is generated when the rectified dimming signal changes from a neutral level to a predetermined level, and wherein the switch control signal turns ON the power switch continuously for a predetermined period.

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