Control circuit for switching transistors

Details Control circuit for switching transistors Control circuit for switching transistors

1984-12-18

1987-01-27

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including means for using, or compensating for, the induced...

307300, 307253, H01H 4700, H03K 1760

Patent

active

046398236

ABSTRACT:
In the particular embodiment of the invention described in the specification, a circuit for interrupting the operation of a switching transistor includes a reactor connected in series with the transistor emitter and a plurality of diodes connected in series between the reactor and the base of the transistor so that the electromotive force induced in the reactor when the reactor current decreases is supplied to the base of the transistor. This makes it possible to maintain the reactor storage time when the transistor is switched off and to adjust the fall time so that the changing rate (di/dt) of the current flowing in a snubber circuit for controlling overvoltage may be minimized so that the structural restrictions imposed on the snubber circuit can be eased and reliability is improved. Noise is also reduced because the current drop rate (-di/dt) when the transistor is switched off can be minimized.

REFERENCES:
patent: 3243510 (1966-03-01), Winston
patent: 3546492 (1970-12-01), Barchok
patent: 3852620 (1974-12-01), Milberger et al.
W. R. Pearson and P. C. Sen, "Designing Optimum Snubber Circuits for the Transistor Bridge Configuration", Department of Electrical Engineering, Queen's University, Kingston, Ontario, Canada K7L3N6, Electric Machines and Power Systems, 8:321-332.

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