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Pulse width modulated switching power supply

  • US 4,849,868 A
  • Filed: 11/03/1988
  • Issued: 07/18/1989
  • Est. Priority Date: 11/03/1988
  • Status: Expired due to Term
First Claim
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1. In a pulse width modulated switching power supply circuit having an input switching means and a plurality of different output voltages, the improvement in a regulator circuit comprising,voltage reference means connected to one of the output for supplying a precision voltage reference,translation means connected between the voltage reference means and each of the outputs for translating each of the output voltages to ground when the voltages are properly regulated,a differential amplifier connected to the translation means for receiving each of the translated output voltages,an optoisolator connected to the differential amplifier and to the input switching means whereby when the output voltages are properly regulated their input switching means is turned to its lowest duty cycle, but when the absolute value of any output voltage is low the differential amplifier diverts current from the optoisolator which increases the duty cycle of the input switching means.

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