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Solid state/electromechanical hybrid relay

  • US 5,699,218 A
  • Filed: 01/02/1996
  • Issued: 12/16/1997
  • Est. Priority Date: 01/02/1996
  • Status: Expired due to Term
First Claim
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1. Solid-state/electromechanical hybrid relay for connecting a power source to a load, comprisingan electromechanical relay which includes a coil and a pair of contacts which close in response to energization of said coil, said pair of contacts being coupled between said load and said power source, said coil having a first, switch terminal lead which is coupled through a switch to a source of coil voltage and a second lead which is connected to a common reference point;

  • a solid state switching device having first and second main electrodes coupled in parallel to the pair of contacts of said relay between said power source and said load, and a gate;

    a capacitor having one lead connected to the first lead of said relay coil and a second lead connected to the gate of said solid state switching device;

    such that closure of said switch supplies a momentary gating current through said capacitor to said solid state switching device to gate said solid state switching device on prior to closure of the contacts, and opening of said switch permits said capacitor to supply a momentary gating current to the gate of said solid state switching device prior to opening of said contacts and hold the solid state switching device on for a brief interval after the opening of said relay contacts.

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