Module failure isolation circuit for paralleled inverters

Details Module failure isolation circuit for paralleled inverters Module failure isolation circuit for paralleled inverters

1978-02-09

1979-04-17

Shoop, William M.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

307 82, 363 71, 363 97, H02M 118

Patent

active

041504259

ABSTRACT:
A module failure isolation circuit for paralleled inverters senses and averages the collector current of each inverter power transistor and compares the collector current of each power transistor with the average collector current of all power transistors to determine when the sensed collector current of a power transistor in any one inverter falls below a predetermined ratio of the average collector current. The module associated with any transistor that fails to maintain a current level above the predetermined ratio of the average collector current is then shut off. A separate circuit detects when there is no load, or a light load, to inhibit operation of the isolation circuit during no load or light load conditions.

REFERENCES:
patent: 3490028 (1970-01-01), Modiano
patent: 3657631 (1972-04-01), Martens et al.
patent: 4061957 (1977-12-01), Jan Vader

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