High-side switch with overcurrent protecting circuit

Details High-side switch with overcurrent protecting circuit High-side switch with overcurrent protecting circuit

1990-03-29

1993-02-02

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361100, H02H 318

Patent

active

051842726

ABSTRACT:
A switching circuit providing detection circuit for detecting a current which flows through a main P-channel MOSFET detection of a floating voltage dependent upon a power supply potential, a reference-voltage generating circuit for generating a reference voltage which is a floating voltage dependent upon the power supply potential and has a constant value independently of variations in power supply potential, a comparator circuit operated on a supply voltage which is a floating voltage dependent upon the power supply potential, for comparing a detected voltage from the detection circuit with the reference voltage from the reference-voltage generating means, to convert the detected voltage into a logic voltage signal (i.e., a bi-level voltage signal and a conversion circuit for converting the logic voltage outputted by the comparator circuit into a voltage measured from a ground potential.

REFERENCES:
patent: 4659997 (1987-04-01), Ferland et al.
patent: 4814288 (1989-03-01), Kimura et al.
patent: 4866495 (1989-09-01), Kinser
patent: 4928159 (1990-05-01), Mihara et al.
patent: 4929884 (1990-05-01), Bird et al.
patent: 5018041 (1991-05-01), Szepesi
patent: 5023678 (1991-06-01), Kinser
Abstract of PCIM 88-International Conference in Tokyo, p. 35.
"Lossless Current Sensing with Sense FETs Enhances Motor Drive", Motorola, Apr. 1986.

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