Darlington connected switch having base drive with active turn-o

Details Darlington connected switch having base drive with active turn-o Darlington connected switch having base drive with active turn-o

1988-11-08

1990-01-02

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307254, 307315, H03K 1704, H03K 1760

Patent

active

048915327

ABSTRACT:
A Darlington connected switching circuit (20) having a bipolar driver transistor (22) and at least one driven transistor (24) having a rapid and reliable turn-off characteristic with low losses suitable for use in power applications such as inverters. The collector to emitter potential of the at least one driven transistor is sensed by a comparator (26) to produce an output signal for controlling the conduction of minority carriers from the base of the driven transistor in response to sensing that the emitter to collector potential has become greater in magnitude than a reference potential (Vref) applied to the comparator. The reference potential is chosen to be at least a function of the switching characteristic of the driven transistor. Appropriate selection of the reference potential applied to the comparator insures that the driver transistor is sufficiently turned off to prevent false turn-offs under light load conditions while additionally ensuring that the at least one driven transistor is rapidly turned off after the driver transistor has been turned sufficiently off to prevent possible false turn-offs.

REFERENCES:
patent: 3814957 (1974-06-01), Way
patent: 4055794 (1977-10-01), Ickes et al.
patent: 4375074 (1983-02-01), Glogolja
patent: 4410810 (1983-10-01), Christen
patent: 4449063 (1984-05-01), Ohmichi et al.
patent: 4508976 (1985-04-01), Hickman et al.
patent: 4572970 (1986-02-01), Allen et al.
patent: 4588904 (1986-05-01), Glogolja
patent: 4590395 (1986-05-01), O'Connor et al.
patent: 4701635 (1987-10-01), Kawazoe et al.
patent: 4725741 (1988-02-01), Shekhawat et al.

Affiliated with

Also associated with

Rating

Darlington connected switch having base drive with active turn-o does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Darlington connected switch having base drive with active turn-o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Darlington connected switch having base drive with active turn-o will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1385276