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Inverter oscillator with current feedback

  • US 4,127,797 A
  • Filed: 09/19/1977
  • Issued: 11/28/1978
  • Est. Priority Date: 04/04/1977
  • Status: Expired due to Term
First Claim
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1. In a high frequency power supply system for supplying power to a gas discharge lamp load or the like, including inverter means connected across a pair of direct-current input terminal means, said inverter means including an oscillator circuit including a first transistor having base, emitter and collector electrodes, and a first transformer having primary and secondary windings;

  • the improvement which comprises(a) a second transformer (T2) having first (12;

         27) and second windings;

    (b) said first transistor (Q1) including an emitter-to-collector circuit connected in series with said primary winding (10) to define a series path which is connected across the input terminal means;

    (c) a starter resistor (R1) connected at one end with the base electrode of said first transistor, the other end of said starter resistor being connected with one end of said primary winding;

    (d) a second resistor (R2) and first diode means (D1) connected in series between one end of said second winding (13) and the base electrode of said first transistor, the other end of said second winding being connected with one of the emitter and collector electrodes of said first transistor;

    (e) second diode means (D2, D3) connected across said second winding, the polarities of said first and second diode means being such that when said second winding has alternate states of energization, said second winding is connected in series with, and isolated from, the circuit defined between the base electrode and one of the emitter and collector electrodes of said first transistor, respectively; and

    (f) means connecting said first winding (12;

         27) in series with one (10;

         11) of said primary and secondary windings of said first transformer (T1).

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