Isolated control circuit for alternating current switches
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United States of America Patent
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Aug 21, 1990
Grant Date -
N/A
app pub date -
Dec 7, 1988
filing date -
Dec 7, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drive circuit controls application of alternating current power to a load. The drive circuit includes an oscillator which applies a high frequency signal to a first input of a logic gate. A control signal is applied to a second input of the gate to enable the gate. A first capacitor is connected to the output of the logic gate. A rectifier connected to the first capacitor rectifies the signal from the first capacitor. A low-pass filter connected to the rectifier removes the high frequency components from the signal. A solid state switch has a switching input connected to the low-pass filter output, which switches the device into a conducting state. This circuit is particularly suited for use where many solid state switches share the same common terminal.
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