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Control circuit for gas discharge lamps, which has a transformer with start and run windings

  • US 5,574,338 A
  • Filed: 06/07/1995
  • Issued: 11/12/1996
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Fees
First Claim
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1. A control circuit for a gas discharge lamp, which is configured for connection to a source of an AC run current, wherein the control circuit comprises:

  • input terminals which are adapted to be coupled to the source of the AC run current;

    output terminals which are adapted to be coupled to the gas discharge lamp;

    a transformer having a primary run winding, a primary start winding and a secondary winding, wherein the primary run winding is coupled to the input terminals and the secondary winding is coupled in parallel with the output terminals;

    a run current control switch coupled in series with the primary run winding;

    an oscillator coupled to the primary start winding of the transformer;

    a start current control switch coupled to the oscillator;

    a current sensor coupled in series with the output terminals; and

    a feedback loop coupled between the current sensor and the run current control switch and between the current sensor and the start current control switch such that the run current control switch and the start current control switch are responsive to the current sensor.

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