Circuit for controlling the base of a power transistor used in h

Details Circuit for controlling the base of a power transistor used in h Circuit for controlling the base of a power transistor used in h

1983-12-14

1987-01-27

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307253, 307570, 307280, 307246, 307549, H03K 345, H03K 1760

Patent

active

046396160

ABSTRACT:
A first transistor (T.sub.2) is connected between the secondary winding of a pulse transformer (TC) and the base of a power transistor (T.sub.6) to be controlled. A second and third transistors (T.sub.3, T.sub.4) are arranged as a latch with dominant reset. The third transistor (T.sub.4) turns on the first (T.sub.2) during the interval of a control pulse, provided that the second (T.sub.3) is off. The second transistor further plays the role of a comparator and is associated with means (R.sub.16, R.sub.15, R.sub.14, R.sub.13, CTN) for tapping a voltage representative of the current delivered by the power transistor to a load and for comparing the said voltage with its base-emitter voltage. A resistor-capacitor circuit (R.sub.17 -C.sub.2) is arranged for supplying a negative bias once a capacitor (C.sub.2) has been energized by the pulse current and associated to a fourth transistor (T.sub.5) arranged for applying the said negative bias to the base of the power transistor during the intervals between two successive pulses.

REFERENCES:
patent: 3566158 (1971-02-01), Paine
patent: 4339671 (1982-07-01), Park et al.
patent: 4393316 (1983-07-01), Brown
patent: 4430586 (1984-02-01), Hebenstreit

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