Inverter with proportional base drive controlled by a current tr

Details Inverter with proportional base drive controlled by a current tr Inverter with proportional base drive controlled by a current tr

1988-11-14

1990-11-13

Stephan, Steven L.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

323289, 307270, 307280, H02H 7122

Patent

active

049706357

ABSTRACT:
An inverter in accordance with the present invention includes a plurality of bipolar transistors (102) with each bipolar transistor having a freewheeling diode (108) poled in parallel with outputs of the bipolar transistor, a current transformer (112) in a positive feedback circuit (110) associated with each bipolar transistor causing a positive feedback to be applied from an output of the inverter to a base of each bipolar transistor to provide a base drive proportional to current flowing in a load coupled to the bipolar transistors, a rectifier (120), disposed in each of the positive feedback circuits for permitting current to flow to the base of the bipolar transistor when the bipolar transistor is conductive and blocking flow of current from the base to the emitter when the bipolar transistor is not forward biased.

REFERENCES:
patent: 4270164 (1981-05-01), Wyman et al.
patent: 4342956 (1982-08-01), Archer
patent: 4356416 (1982-10-01), Weischedel
patent: 4453089 (1984-06-01), Shuey et al.
patent: 4639823 (1987-01-01), Kuroki
patent: 4651267 (1987-03-01), Nguyen et al.
patent: 4692851 (1987-09-01), Attwood
patent: 4716513 (1987-12-01), Ito
patent: 4728817 (1988-03-01), Jessee et al.
patent: 4775803 (1988-10-01), Mori

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