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Half-bridge power converter for driving LED by series-resonant connection of inductor, inductor and capacitor

  • US 8,138,688 B2
  • Filed: 01/22/2010
  • Issued: 03/20/2012
  • Est. Priority Date: 01/22/2010
  • Status: Expired due to Fees
First Claim
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1. An LLC half-bridge power converter for driving an LED, which is configured to generate an output pulse signal from an external input power DC through an output unit (110) according to frequency control of a controller (100), resonate the output pulse signal of the output unit (110) through an LLC resonator (120), rectify the output pulse signal through a rectifier (130) at the secondary side of the LLC resonator (120) to output a DC voltage to a load, detect the output of the rectifier (130) through a feedback unit (140) and feed back the output of the rectifier (130) to the controller (100),wherein the controller 100 is a CMOS timer IC that has 50% duty and a usable frequency range of 50 KHz through 1 MHz and receives a feedback signal based on a soft-start set value set to the feedback unit (140) to vary the output frequency thereof according to a capacitance variation of a frequency varying condenser (C3) to control the final output level of the rectifier (130), and the feedback unit (140) is configured to detect the output of the rectifier (130) and operates an opto-coupler according to the soft-start set value, control the opto-coupler to be tuned off when the output of the rectifier (130) exceeds a set rated voltage and vary the capacitance of the frequency varying condenser (C3) of the controller (100) according to the opto-coupler.

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