Power supply unit

Details Power supply unit Power supply unit

2008-12-23

2010-12-28

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S538000, C323S316000, C323S317000

Reexamination Certificate

active

07859324

ABSTRACT:
High-accuracy overcurrent detection is performed, while a loss resulting from the current detection is significantly reduced. A switch section outputs the voltage between the both terminals of a current detection resistor using an AND signal between an output signal from a hysteresis comparator and an output signal from a pre-driver. The voltage is filtered by an electrostatic capacitor element and a resistor, and inputted to a comparator. The comparator makes a comparison between the signals inputted to the two input terminals thereof, and outputs the result of the comparison to a digital filter. When an overcurrent begins to flow in a power supply unit, the levels of the voltages inputted to the two input terminals of the comparator are inverted so that the comparator outputs an inversion signal to the digital filter. The digital filter outputs a detection signal to an overcurrent detection circuit when an arbitrary time has elapsed.

REFERENCES:
patent: 4906874 (1990-03-01), Fuji et al.
patent: 5694063 (1997-12-01), Burlison et al.
patent: 2004/0212420 (2004-10-01), Otake
patent: 2005/0017702 (2005-01-01), Kernahan et al.
patent: 2008/0259655 (2008-10-01), Wei et al.

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