Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1986-05-12
1988-02-16
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307270, 307254, 307300, H03K 326, H03K 333
Patent
active
047257415
ABSTRACT:
Prior circuits for rapidly switching Darlington-connected transistors between on and off states have accomplished relatively fast switching by applying reverse base drive to the transistors to quickly sweep the excess carriers therefrom. However, such circuits have not accomplished the required degree of reduction of turn off time and have induced localized "hot spots" in the base-collector junctions of the transistors. In order to overcome these problems, a drive circuit according to the present invention includes first and second power sources of first and second polarities, a turn-on network coupled between the first power source and the control electrode of a driver transistor of a Darlington-connected pair for selectively turning on the transistor pair, turn-off capacitors coupled between the turn-on network and the control electrodes of each of the transistors and a turn-off network coupled between the capacitors and the second power source for coupling the second power source to the capacitors to rapidly turn off the transistors. Means are included for providing a dwell interval between operation of the turn-on network and operation of the turn-off network to allow recombination of excess carriers in the transistors to minimize the incidence of localized hot spots.
REFERENCES:
patent: 3697783 (1972-10-01), Seager
patent: 3971961 (1976-07-01), Inami et al.
patent: 4132906 (1979-01-01), Allen
patent: 4210826 (1980-07-01), Baker
patent: 4234805 (1980-11-01), Carlsen, II
patent: 4239988 (1980-12-01), Akamatsu
patent: 4312029 (1982-01-01), Zellmer
patent: 4318011 (1982-03-01), Zeis
patent: 4404478 (1983-09-01), Rischmuller
patent: 4410810 (1983-10-01), Christen
patent: 4616144 (1986-10-01), Hideshima et al.
Dhyanchand P. John
Shekhawat Sampat S.
Davis B. P.
Miller Stanley D.
Sundstrand Corporation
LandOfFree
Drive circuit for fast switching of Darlington-connected transis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drive circuit for fast switching of Darlington-connected transis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drive circuit for fast switching of Darlington-connected transis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2222382