Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2008-04-24
2010-12-28
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
Reexamination Certificate
active
07859812
ABSTRACT:
A power IC with an over-current protection receives an input voltage and converts the input voltage into an output voltage to a load. The present invention controls a power transistor to provide an output current to the load, and uses the output control unit to control the power transistor. Furthermore, the over-current protection circuit has a constant current limit threshold and a fold-back current limit threshold for controlling the power transistor. When the output current is larger than the constant current limit threshold, the output current is clamped to a constant current value to descend the output voltage to a rated value. When the output current is larger than the fold-back current limit threshold, the output current is limited to a low current value to descend the output voltage to zero. Thereby, the inner circuit of the power IC and the load are protected.
REFERENCES:
patent: 4394703 (1983-07-01), Butcher
patent: 4792745 (1988-12-01), Dobkin
patent: 7038436 (2006-05-01), Goto et al.
Chen Chia-Min
Jian Ming-Hong
Holtek Semiconductor Inc.
Jackson Stephen W
Rosenberg , Klein & Lee
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