Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1991-05-09
1993-04-27
Pellinen, A. D.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307571, 307592, 323290, 361245, 361 82, 361153, H03K 5135, H03K 17284, G05F 156
Patent
active
052065405
ABSTRACT:
A transformer isolated circuit for driving a semiconductor power switch includes a transformer which is driven with a high frequency Pulse Width Modulated (PWM) signal in such a way that the constantly present PWM carrier supplies the power needed for high gate current pulses, while different duty cycles determine the "on" or "off" state of the power device under control. Transformer saturation is prevented by sensing primary current and returning it to zero once per PWM cycle. Because of the high PWM carrier frequency used, the average transformer power is low, yet the secondary side is able to deliver high pulse currents for fast "on-off" switching of the gate of even the largest N- or P-channel device, without need for auxiliary power supplies. Also included are provisions for extremely fast output current limiting, for use where short circuit protection is necessary. Discussion of a monolithic implementation is included.
REFERENCES:
patent: 3675051 (1972-07-01), Mioduski
patent: 4052623 (1977-10-01), Loberg
patent: 4438356 (1984-03-01), Fleischer
patent: 4461966 (1984-07-01), Hebenstreit
patent: 4634903 (1987-01-01), Montorfano
patent: 4792746 (1988-12-01), Josephson et al.
patent: 4876624 (1989-10-01), Chow
"Gate Drive Requirements," Section 1-Chapter 6, Motorola Power MOSFET Transistor Databook, 1988, pp. 1-6-2-1-6-22.
Wood, P., "Transformer-Isolated HEXFET Driver Provides very large duty cycle ratios," International Rectifier, Chapter 15, Application Note 950A, pp. A-141-A-143.
de Sa e Silva Claudio
Holland Varnum S.
Miller Wilburn M.
Putsch Jeffrey D.
Elms Richard T.
Pellinen A. D.
Unitrode Corporation
LandOfFree
Transformer isolated drive 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 Transformer isolated drive circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transformer isolated drive circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2329832