Proportional base drive circuit for transistorized bridge invert

Details Proportional base drive circuit for transistorized bridge invert Proportional base drive circuit for transistorized bridge invert

1985-06-14

1987-03-17

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363132, H02H 1122, H02M 75387

Patent

active

046512675

ABSTRACT:
A proportional base drive circuit which overcomes the problems of the prior art relative to relatively long turn-off time of power switches in an inverter and the absence of protection circuitry therefor includes a current transformer having a primary winding coupled to a main current electrode of a pair of power switches and first and second secondary windings each of which develops regenerative currents proportional to load current. First and second auxiliary switches are coupled between the secondary windings and the control electrodes of the power switches. Means are included for operating the auxiliary switches in synchronism with the power switches so that the power switches operate in rapid fashion. Means are also included for disabling the power switches when an overcurrent condition is sensed.

REFERENCES:
patent: 3374415 (1968-03-01), Jewett et al.
patent: 3588669 (1971-06-01), Wellford et al.
patent: 3999086 (1976-12-01), Ekelund
patent: 4319316 (1982-03-01), Farrer et al.
patent: 4424556 (1984-01-01), Maeda et al.
patent: 4493017 (1985-01-01), Kammiller et al.
"A New Universal Proportional Drive Technique for High Voltage Switching Transistors" by Ralph Carpenter of ELDEC Corporation, Lynwood, Washington--D-2, pp. 1-15, 1981.

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