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Light Emitting Diode (LED) Driving Device

  • US 20090146575A1
  • Filed: 12/05/2007
  • Published: 06/11/2009
  • Est. Priority Date: 12/05/2007
  • Status: Active Grant
First Claim
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1. A light emitting diode (LED) driving device comprising:

  • a power factor correction (PFC) circuit, for adjusting an output signal according to a feedback signal;

    a bridge switch circuit, coupled to the PFC circuit, for transforming the output signal from the PFC circuit into a pulse signal;

    a resonant circuit, coupled to the bridge switch circuit, for outputting a sinusoidal signal according to the pulse signal;

    a transformer, a first end of a primary-side of the transformer coupled to the resonant circuit, for receiving the sinusoidal signal; and

    a feedback circuit, coupled to a second end of the primary-side of the transformer, for outputting the feedback signal corresponding to a primary-side current of the transformer.

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