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Current control apparatus for a flyback capacitor charger

  • US 4,394,719 A
  • Filed: 12/11/1981
  • Issued: 07/19/1983
  • Est. Priority Date: 12/11/1981
  • Status: Expired due to Fees
First Claim
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1. In a DC to DC converter adapted to be energized by a power supply, the converter comprising a transformer including a primary winding and secondary winding, and switching means including a power transistor having a base electrode, the power transistor being coupled between the power supply and the primary winding for periodically interrupting the power supply current to cause current to flow in the secondary winding, the improvement comprising:

  • (a) a high gain, signal transistor having a base electrode, the signal transistor being coupled in emitter follower configuration to the base of the power transistor; and

    (b) a diode and a feedback current limiting resistor connected in series between the secondary winding and the base of the signal transistor.

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