Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1993-11-19
1996-05-21
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 77, H02H 318
Patent
active
055195571
ABSTRACT:
A power supply polarity reversal protection device includes a voltage controlled switching device, e.g. an N-channel MOSFET connected between the power supply output (e.g. a positive supply voltage) and the circuit to be powered by the supply, i.e. the load. A diode, preferably the parasitic diode inherent in the MOSFET between the drain and source, is arranged so that when the positive supply terminal is connected to the transistor, the diode is forward biased and will allow a diode current to flow. A sensing means generates a control terminal voltage in response to the diode current flow. This control terminal voltage is applied to the switching means control gate and is sufficient to cause full conduction through the switching means. If, instead, a negative supply voltage is connected to the transistor, the diode will be reverse biased and no current will flow. Since there is no diode current, the sensing means will not generate a control terminal voltage and the switching means will not turn on, thus protecting the load.
REFERENCES:
patent: 4260910 (1981-04-01), Colman
patent: 4423456 (1983-12-01), Zaidenweber
patent: 4679112 (1987-07-01), Craig
patent: 5012381 (1991-04-01), Elliott
patent: 5077486 (1991-12-01), Marson et al.
patent: 5079608 (1992-01-01), Wodarczyk et al.
patent: 5134321 (1992-07-01), Mehta
Kopera, Jr. Joseph J.
Wand Thomas J.
Chrysler Corporation
Jackson S.
Pellinen A. D.
Taravella Christopher A.
LandOfFree
Power supply polarity reversal protection circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power supply polarity reversal protection circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supply polarity reversal protection circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2043284