Protective device of a current source inverter

Details Protective device of a current source inverter Protective device of a current source inverter

1978-02-15

1980-02-12

Miller, J. D.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 37, 363 96, H02M 700, H02M 545

Patent

active

041886631

ABSTRACT:
A current source inverter having a converter for changing alternating current into direct current, an inverter for changing the d.c. output of the converter into alternating current, and a reactor interposed between the converter and the inverter comprises power failure detecting means for detecting the power failure of the a.c. input of the converter. The power failure detecting means is constructed of square wave generator circuits which generate square waves when voltages in respective polarities of respective phases of the a.c. input exist, an adder which adds the outputs of said square wave generator circuits, and a comparator which compares an output of said adder with a predetermined value and which provides an output when the adder output is below the predetermined value. Both terminals of the reactor of the current source inverter are substantially short-circuited by the output of said power failure detecting means, thereby to prevent occurrence of an overvoltage at the time of the power failure of the a.c. input of the converter.

REFERENCES:
patent: 3273043 (1966-09-01), Clarke et al.
patent: 3584259 (1971-06-01), Traub et al.
patent: 3749944 (1973-07-01), Luebrecht
patent: 4028607 (1977-06-01), Watanabe
patent: 4066954 (1978-01-01), Vukasovic et al.
patent: 4086621 (1978-04-01), Vukasovic

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