Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Reexamination Certificate
2006-11-28
2006-11-28
Easthom, Karl (Department: 2838)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
C323S299000, C323S285000
Reexamination Certificate
active
07142401
ABSTRACT:
A switching regulator provides energy to an inductor-capacitor combination that supply a DC voltage as an output. The presence of a current that can be significantly lower than the typical load current is detected using a pulse signal that provides a measure of the current supplied by the regulator to the inductor. A comparator compares this signal to a reference voltage that is related to the current level to be detected. This reference voltage is adjustable based on the voltage applied by the regulator and the voltage being ultimately supplied as the DC output voltage. The comparator and a capacitor perform an integration function that results in a voltage that ramps upward if the current threshold is being exceeded. When this ramping voltage passes a predetermined level, a signal is provided to indicate that the threshold has been exceeded.
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Bien David E.
Daniels Paul J.
Foerstner Gerrit M.
Behm Harry R
Clingan, Jr. James L.
Easthom Karl
Freescale Semiconductor Inc.
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