System and method for protecting relay contacts
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United States of America Patent
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Jan 30, 1996
Grant Date -
N/A
app pub date -
Apr 22, 1993
filing date -
Apr 22, 1993
priority date (Note) -
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Abstract
A system and method for protecting relay contacts from erosion utilizes a sensor which senses voltage change in a switch controlling a load relay. In response to operation of the switch, the sensor sends a current to a set of pass transistors which are connected in series to the load power source and the load to turn off the transistors thereby cutting off load current flow to the load. A delay element is connected in series between the sensor and the set of transistors which cuts off the current flow to the set of transistors for a period of time selected to enable the load relay contacts to fully close or fully open before conducting electrical current therethrough.
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