Very low power consumption solid state relay
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United States of America Patent
Stats
-
Jul 13, 2010
Grant Date -
Apr 30, 2009
app pub date -
Apr 28, 2008
filing date -
Oct 30, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A normally closed solid state power relay with an optionally optically coupled input circuit at an input terminal with a driver circuit electrically coupled to input terminal to drive one or more a power transistors, preferably MOSFET transistors so that the power transistor is held in the on state by the driver when no voltage or a low level voltage is applied to the input terminal, and the power transistor is held in the off state by the driver when a high level voltage is applied to the input terminal. An energy storage device, a battery or capacitor, is coupled to the driver to powers the driver with the energy storage device being charged by energy from the input terminal when said input terminal when a high level voltage is applied to the input terminal. The energy storage device is charged by leakage current through a diode or through a resistor from the input circuit when the input circuit is in a high state.
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