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Low-power relay operating circuit

  • US 5,457,595 A
  • Filed: 10/18/1993
  • Issued: 10/10/1995
  • Est. Priority Date: 10/18/1993
  • Status: Expired due to Term
First Claim
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1. A low-power relay operating circuit comprising the combination ofa low-current source of DC power having a hot terminal and a common terminal;

  • a bistable relay having an energizing winding with first and second terminals;

    means connecting said first terminal of said winding to said common terminal of said source;

    first and second semiconductor switches connected to said second terminal, said switches being alternately operable in response to control signals to respectively set and reset said relay;

    first and second capacitors connected to said first and second semiconductor switches, respectively;

    first and second charging circuits connected to said low-current source and to said first and second capacitors, respectively, to charge said capacitors from said source, said switches being connected to selectively discharge said capacitors in opposite directions through said relay winding in response to said control signals.

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