Voltage detector and protection apparatus using the same
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United States of America Patent
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Aug 13, 2013
Grant Date -
Oct 13, 2011
app pub date -
Apr 1, 2011
filing date -
Apr 7, 2010
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Abstract
A voltage detector includes a zener diode having a cathode connected to a detect terminal of the voltage detector, a junction field effect transistor having an input terminal connected to an anode of the zener diode, and a resistor connected between an output terminal and a control terminal of the junction field effect transistor. When the voltage on the detect terminal is higher than the breakdown voltage of the zener diode, the junction field effect transistor produces a current flowing through the resistor, and thereby a detection signal can be obtained from the voltage across the resistor.
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