Electric circuit providing protection from transients
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United States of America Patent
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Nov 22, 2011
Grant Date -
Mar 27, 2008
app pub date -
Sep 18, 2007
filing date -
Sep 21, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
An electric circuit for supplying power to a DC application is disclosed. The electric circuit comprises a DC power source (1) connectable to an alternator charging circuit (2), an FET (T7), and a capacitor (8) connected across the gate terminal and the source terminal of the FET (T7). The drain terminal of the FET (T7) is connected to a negative terminal of the DC source (1). The FET (T7) protects the circuit against accidental connection of the alternator charging circuit (2) to the DC power source (1) with reversed polarity, by opening a switch (6) of the FET (T7) when this occurs. The capacitor (8) protects the FET (T7) from being pushed into avalanche in case a load-dump transient occurs. This is because the capacitor (8) in this case will charge and discharge, thereby introducing a time delay before the switch (6) is opened. Protection against load-dump transients is thereby obtained by means of a small component with low energy dissipation. Thereby the size of the circuit is reduced and energy is conserved.
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