Lamp driving circuit

Lamp driving circuit

  • CN 101,461,288 A
  • Filed: 05/29/2007
  • Published: 06/17/2009
  • Est. Priority Date: 05/31/2006
  • Status: Active Application
First Claim
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1. , a kind of lamp drive circuit (10) that is used for the operated discharge lamp, described lamp drive circuit comprises:

  • Be used to be connected to the input terminal of voltage source;

    Comprise the series connection setting of first switchgear (Q1) and second switch equipment (Q2), it connects described input terminal;

    Inverter resonant circuit (20,30), one of them described switchgear of its bypass and comprise inverter inductance (L1), inverter electric capacity (C1) and lamp splicing ear (01,02);

    Control circuit (40), it is coupled to the control corresponding electrode (G of described switchgear Q1, G Q2) so that be created on the lamp current (I of commutation under the commutating frequency L), this control circuit is configured to carry out following operation;

    In first interim of commutation cycle, make described first switchgear alternately in conducting during the cycle very first time and not conducting during second time cycle under the high-frequency of described commutating frequency being higher than;

    In second interim of described commutation cycle, make described second switch equipment alternately in conducting during the 3rd time cycle and not conducting during the 4th time cycle under the high-frequency of described commutating frequency being higher than;

    AndThe described cycle very first time is extended in first at interval beginning place in the described commutation cycle, and extends described the 3rd time cycle in second at interval beginning place of described commutation cycle, improves so that realize the commutating speed of described lamp current.

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