Relay-based foolproof circuit for over-voltage protection
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United States of America Patent
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Jul 26, 2016
Grant Date -
Oct 8, 2015
app pub date -
Jun 24, 2014
filing date -
Apr 2, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a relay-based foolproof circuit for over-voltage protection, which is electrically connected between a plug and an electric device, and includes a relay having at least one magnetic core, a coil wound around the magnetic core and two reed switches each having a reed and being normally in a closed state because of the elastic effect of its reed. The relay-based foolproof circuit is able to provide AC power of a first specification (e.g., 110 V AC power) received from the plug to the electric device. However, when AC power of a second specification (e.g., 220 V AC power) greater than the first specification flows through the coil, the coil causes the magnetic core to generate a magnetic force great enough to drive the two reed switches into an open state for stopping the AC power of the second specification from being provided to the electric device.
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