ELECTROSTATIC PROTECTION CIRCUIT
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United States of America Patent
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Issued Date -
Sep 25, 2014
app pub date -
Sep 3, 2013
filing date -
Mar 25, 2013
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A protection circuit comprises first and second input terminals to which a power source voltage for a protected load circuit can be applied. A first transistor connected between the input terminals. The first transistor has a gate/base electrode connected to a current path electrode through a resistor. A low-pass filter is connected in parallel with the first transistor between the input terminals. A second transistor connected in parallel with the resistor, and having a control electrode connected to an output terminal of the low-pass filter. Zener diodes may be optionally included to provide overvoltage protection. In some embodiments, the low-pass filter may comprise a series-connected resistor and capacitor.
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