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Discharge Lamp Lighting Circuit

  • US 20080018263A1
  • Filed: 07/19/2007
  • Published: 01/24/2008
  • Est. Priority Date: 07/20/2006
  • Status: Active Grant
First Claim
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1. A lighting circuit for turning on a discharge lamp, comprising:

  • a DC-AC converting circuit to convert an input DC voltage into an AC voltage in response to a control signal for controlling power to be applied to the discharge lamp;

    a transformer including a primary winding and a secondary winding to receive the AC voltage from output of the DC-AC converting circuit;

    a capacitor on the primary side of the transformer;

    an inductor on the primary side of the transformer;

    first and second outputs for supplying a power from the secondary winding to the discharge lamp;

    a resistor having one end connected to the second output and grounded and the other end connected to one end of the secondary winding; and

    a detecting circuit including a current monitor circuit for monitoring a current flowing to the discharge lamp by using a signal sent from the other end of the resistor,wherein the capacitor, the inductor and the primary winding are connected in series.

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