Power supply device and overvoltage protection method
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United States of America Patent
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Jul 11, 2017
Grant Date -
Oct 22, 2015
app pub date -
Apr 13, 2015
filing date -
Apr 18, 2014
priority date (Note) -
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Abstract
A power supply device and an overvoltage protection method are disclosed. The power supply device includes an energy storage unit, a first switch, a second switch and a driving module. The energy storage unit generates a driving voltage according to a supplied voltage. The first switch selectively transmits the supplied voltage to the energy storage unit according to a first driving signal. The second switch is selectively conducted to adjust the driving voltage according to a second driving signal. The driving module conducts the second switch when the supplied voltage is rose at a first predetermined value, and generates the first driving signal and the second driving signal after the supplied voltage is rose at a second predetermined value. The first predetermined value is smaller than the second predetermined value.
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