Light emitting diode (LED) backlight driving circuit

Light emitting diode (LED) backlight driving circuit

  • CN 102,103,831 A
  • Filed: 07/16/2010
  • Published: 06/22/2011
  • Est. Priority Date: 07/16/2010
  • Status: Active Application
First Claim
Patent Images

1. a LED-backlit driving circuit comprises inductance (L) and Boost switching tube (S 0), a termination of inductance (L) is gone into DC voltage (V s), the other end of inductance (L) connects Boost switching tube (S 0) drain electrode, Boost switching tube (S 0) source ground, it is characterized in that:

  • Also comprise n paths of LEDs flow equalizing circuit, n is the string number of LED, and n is the natural number greater than 1, wherein;

    The first paths of LEDs flow equalizing circuit comprises the first current-sharing switching tube (S 1) and the first transformer (T 1) secondary winding (N S1), the first current-sharing switching tube (S 1) drain electrode connect Boost switching tube (S 0) drain electrode, the first current-sharing switching tube (S 1) source electrode connect the first transformer (T 1) secondary winding (N S1) the different name end, the first transformer (T 1) secondary winding (N S1) end of the same name connect the input end of LED string;

    N paths of LEDs flow equalizing circuit comprises n current-sharing switching tube (S n) and n-1 transformer (T N-1) former limit winding (N Pn-1), n current-sharing switching tube (S n) drain electrode connect Boost switching tube (S 0) drain electrode, n current-sharing switching tube (S n) source electrode connect n-1 transformer (T N-1) former limit winding (N Pn-1) end of the same name, n-1 transformer (T N-1) former limit winding (N Pn-1) the different name end connect the input end of n LED string;

    When n>

    2, make 1<

    i<

    n, i is a natural number, i paths of LEDs flow equalizing circuit comprises i current-sharing switching tube (S i), i-1 transformer (T I-1) former limit winding (N Pi-1) and i transformer (T i) secondary winding (N Si), i current-sharing switching tube (S i) drain electrode connect Boost switching tube (S 0) drain electrode, i current-sharing switching tube (S i) source electrode connect i-1 transformer (T I-1) former limit winding (N Pi-1) end of the same name, i-1 transformer (T I-1) former limit winding (N Pi-1) the different name end connect i transformer (T i) secondary winding (N Si) the different name end, i transformer (T i) secondary winding (N Si) end of the same name connect the input end of i LED string;

    The output terminal of all LED strings all connects Boost switching tube (S 0) source electrode and ground connection.

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