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PRIMARY DRIVE SYNCHRONOUS HIGH-SPEED SWITCHING RECTIFYING CIRCUIT FOR LLC HALF-BRIDGE POWER CONVERTER FOR DRIVING LED

  • US 20110187280A1
  • Filed: 01/29/2010
  • Published: 08/04/2011
  • Est. Priority Date: 01/29/2010
  • Status: Abandoned Application
First Claim
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1. A primary drive synchronous high-speed switching rectifier circuit for an LLC half-bridge power converter for driving an LED, which comprises an output unit 100 receiving a 50% duty cycle pulse signal according to frequency control of a controller and generating pulse signals (having positive voltage periods and negative voltage periods) through a first transformer T1 and first and second switching FETs Q1 and Q2, a resonator 200 LLC-resonating the pulse signals of the output unit 100 according to an inductor L1, a primary coil of a third transformer T3 and a resonating condenser C5, and a secondary rectifier 300 rectifying pulse signals output from two secondary coils of the third transformer T3 of the resonator 200 through rectifying elements, smoothening the pulse signals and outputting DC power to a load,wherein third and fourth FETs Q3 and Q4 are used as the rectifying elements of the secondary rectifier 300 to full-wave-rectify the pulse signals, and the LLC half-bridge power converter further comprises a rectifier controller 400 that is configured to delay an input pulse by delay time set in consideration of element delay, rise time and fall time and generate a control pulse signal having off time between pulses according to alternate combination of a delayed pulse and the input pulse to control the third and fourth FETs Q3 and Q4 of the secondary rectifier 300.

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