Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2006-08-18
2008-07-22
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
C361S093900
Reexamination Certificate
active
07403365
ABSTRACT:
An over-current detection circuit using the ON-voltage of a main MOSFET is provided, which is resistant to process variations of a main MOSFET and is not easily influenced by switching noise. Separately from a main MOSFET (Q1), a sense MOSFET (Q3) whose size is 1/m of the main MOSFET is provided and it is caused to be normally on. A DC ON-voltage generated when a current that is 1/m of an over-current value is caused to flow through the sense MOSFET is obtained as a reference voltage for over-current setting. The ON-voltage when the main MOSFET is on is sampled and held, and it is obtained as a DC voltage. These DC voltages are compared in a comparator (COMP).
REFERENCES:
patent: 6031361 (2000-02-01), Burstein et al.
patent: 2003-060449 (2003-02-01), None
Kanouda Akihiko
Kawakubo Yosuke
Kurita Kozaburo
Sase Takashi
Crowell & Moring LLP
Jackson Stephen W
Nguyen Danny
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