Solid state relay
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United States of America Patent
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Apr 25, 2000
Grant Date -
N/A
app pub date -
Mar 18, 1998
filing date -
Mar 18, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solid state relay includes a power semiconductor controlled by a gate electrode. A current detector provides a signal which is a function of the absolute value of the current through the power semiconductor. An evaluation circuit coupled to the current detector receives the current signal. The current detector may include a ferromagnetic core surrounding a conductor coupled to the power semiconductor, a coil wound around the core, and an oscillator generating a carrier signal and a detection circuit, both coupled to the core. The current detector is used to control latching of the relay and to generate status signals if predetermined parameters are exceeded.
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