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Method and apparatus for preventing improper switching of a dual power supply

  • US 5,309,348 A
  • Filed: 08/13/1992
  • Issued: 05/03/1994
  • Est. Priority Date: 08/13/1992
  • Status: Expired due to Term
First Claim
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1. A dual switching power supply system having first and second switching power supply means, comprising:

  • a first switch control means which outputs a first switch control signal for turning the first switching power supply means on and off;

    a second switch control means which outputs a second switch control signal for turning the second switching power supply means on and off; and

    a differentiating circuit, coupled to both the first and second switching power supply means, for delaying the phase of the second switch control signal with respect to the first switch control signal by a predetermined amount while keeping the frequencies of the first and second switch control signals equal to each other, such that malfunction of the dual switching power supply system due to noise from the state changes of the first and second switch control signals is eliminated.

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