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Telephone line power supply

  • US 7,499,539 B2
  • Filed: 11/06/2001
  • Issued: 03/03/2009
  • Est. Priority Date: 11/09/2000
  • Status: Expired due to Fees
First Claim
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1. A power supply circuit for powering an electrical device using power from a telephone line, said circuit comprising:

  • a gyrator having an input coupled to the telephone line and an output;

    an inductor having and input and an output;

    an oscillator having an output;

    a pulse circuit coupled to said oscillator and coupled between the output of said gyrator and the input of said inductor;

    a converter coupled between the output of said inductor and the electrical device, said converter producing line power at an output; and

    a combiner having a input coupled to a host power supply and an output coupled to the output of said converter, said combiner supplementing said line power with host power from said host power supply when the voltage level of said line power falls below a predetermined level.

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