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Digital input power supply and method

  • US 4,901,217 A
  • Filed: 02/13/1989
  • Issued: 02/13/1990
  • Est. Priority Date: 12/01/1987
  • Status: Expired due to Term
First Claim
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1. A circuit, coupled between a peripheral unit and a personal computer, for converting a differential digital signal originating from said personal computer, to a DC power supply voltage, switching between a first voltage and a second voltage, wherein said first voltage represents a first digital state and said second voltage represents a second digital state, comprising:

  • a pair of input terminals at a said circuit coupled to receive said differential digital signal from said personal computer;

    a pair of output terminals from said circuit coupled to provide said DC power supply voltage;

    rectifier means coupled between said input terminals of said circuit and said output terminals of said circuit for providing conversion of said differential digital signal to said DC power supply voltage;

    said personal computer having output means to send said differential digital signal to said circuit;

    said differential digital signal has said first and second voltages at approximately equal magnitude about a reference value, so as to provide a substantially continuous DC power supply voltage from said output terminals of said circuit.

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