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Transformer-isolated pulse drive circuit

  • US 5,786,687 A
  • Filed: 12/03/1996
  • Issued: 07/28/1998
  • Est. Priority Date: 12/03/1996
  • Status: Expired due to Term
First Claim
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1. A switch-mode power converter comprising:

  • a transistor switch; and

    a pulse transformer circuit for driving the transistor switch in response to a stream of switch control pulses, the pulse transformer circuit comprising;

    a transformer having a primary winding and a secondary winding;

    a primary capacitor;

    the switch control pulse source and the primary capacitor connected in series with the primary winding, wherein the primary capacitor is sized so that beginning at the leading edge of a switch control pulse, a positive voltage spike is applied across the primary winding inducing a positive voltage spike across the secondary winding, and, beginning at the trailing edge of a switch control pulse, a negative voltage spike is applied across the primary winding inducing a negative voltage spike across the secondary winding; and

    a driver operatively connected to the secondary winding and the transistor switch, the driver activating the transistor switch in response to the induced positive voltage spike across the secondary winding and discharging the transistor switch through a bipolar discharging transistor in response to the induced negative voltage spike across the secondary winding.

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