Thyristor circuit providing overcurrent protection to a low impedance load
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United States of America Patent
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Mar 1, 2005
Grant Date -
Oct 28, 2004
app pub date -
Apr 23, 2003
filing date -
Apr 23, 2003
priority date (Note) -
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Abstract
A thyristor provides overcurrent protection to a low impedance load, such as a transformer, by adding a resistance in series with the transformer winding. As overcurrents attempt to pass through the transformer winding, a sufficient voltage is generated in the transformer so that a thyristor connected thereacross is triggered into conduction. A resistance formed between the thyristor gate and cathode establishes the threshold of current that can pass through the transformer winding before the thyristor is triggered. When triggered into conduction, the thyristor shunts the current and the transformer is thus protected.
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