Apparatus and method for increasing switching life of electromechanical contacts in a hybrid power switching device
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United States of America Patent
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Issued Date -
Oct 30, 2008
app pub date -
Apr 30, 2007
filing date -
Apr 30, 2007
priority date (Note) -
Abandoned
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Abstract
A circuit and related methods for use in a hybrid power switching device are provided that include at least one electromechanical relay having a coil and a contact, the electromechanical relay defining a release time and a sticking time during an on-to-off transition. At least one solid state switch is electrically connected to the contact, and a timing circuit is electrically connected to the electromechanical relay and the solid state switch. The timing circuit includes a capacitor electrically connected to a control signal input and at least one resistor electrically connected to the capacitor and to the solid state switch, wherein the capacitor and the resistor are sized such that the capacitor discharges through the resistor to activate the solid state switch for a period of time that is longer than the electromechanical relay release time and sticking time.
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