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Buck-boost regulated D.C. to D.C. power supply

  • US 4,549,254 A
  • Filed: 02/03/1983
  • Issued: 10/22/1985
  • Est. Priority Date: 02/03/1983
  • Status: Expired due to Term
First Claim
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1. A power supply, having an input node and an output node, for supplying DC electrical power to an electronic control system of an engine, which comprises:

  • a series switching regulator section for regulating the voltage at the output node having a transformer with primary and secondary windings, switching means for switching on and off the flow of current from the input node through the primary winding to the output node, and switching control circuit means for controlling the operation of the switching means in response to the voltage at the output node;

    a shunt switching regulator section for boosting the voltage supplied at the input node to produce a desired voltage at the output node when the voltage at the input node is below a predetermined value, the shunt switching regulator section having shunt means for intermittently shunting current through the primary winding towards ground and oscillator circuit means for controlling the operation of the shunt means;

    bypass resistor means for bypassing the switching means during start-up of the power supply to provide a path for sufficient leakage current to turn on the switching control circuit means.

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