Protection Circuit and Protection Method
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United States of America Patent
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Issued Date -
Jun 7, 2012
app pub date -
Dec 6, 2011
filing date -
Dec 6, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A controller is applied with a protection circuit and a protection method. A controller detects an input signal generated by a current flowing through a detection resistor, thereby turning on or off a switch, for controlling the current. A shielding time generator provides a shielding time. When the switch is turned on and when a current timing without the shielding time, a short-circuit detector compares the input signal with a first reference voltage, thereby asserting a short-circuit detection signal. When the switch is turned off or when the current timing is during the shielding time, the short-circuit detection signal is not asserted. Each time the short-circuit detection signal is asserted, a logic controller turns off the switch, thereby reducing the current.
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