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Light Emitting Diode Driving Device

  • US 20100308743A1
  • Filed: 12/03/2009
  • Published: 12/09/2010
  • Est. Priority Date: 06/08/2009
  • Status: Abandoned Application
First Claim
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1. A light emitting diode (LED) driving device comprising:

  • an LED unit having an input side adapted to receive an external AC input voltage, and an output side, said LED unit outputting at said output side a driving current corresponding to the input voltage; and

    a current limiting unit coupled to said output side of said LED unit, and receiving the driving current from said output side of said LED unit, said current limiting unit including a parallel connection of a bypass switch and a current limiting circuit coupled across said output side of said LED unit, said bypass switch being operable between an ON-state and OFF-state;

    wherein said current limiting unit is operable so as to permit flow of the driving current through one of said bypass switch and said current limiting circuit such that said current limiting unit has a first conduction impedance when said bypass switch is in the ON-state, and a second conduction impedance larger than the first conduction impedance when said bypass switch is in the OFF-state.

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