Fault protection circuit

Details Fault protection circuit Fault protection circuit

1977-06-20

1979-02-13

Shoop, William M.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 37, H02M 118

Patent

active

041398858

ABSTRACT:
An a-c supply system includes an input bridge circuit, connected to receive a-c input voltage and produce an output d-c voltage which is passed through a filter to an inverter having a plurality of thyristor switches, which switches are regulated to produce an a-c output voltage for supplying a load. If two of the switches are inadvertently triggered on to produce a fault across the bus, the rapid discharge of the filter capacitor into this fault is sensed, and the protection circuit provides both simultaneous turn-on of all of the inverter power switches, and turn-off of the input bridge. The input bridge turn-off is achieved by simultaneous removal of the gate drive from all the power switches in the input bridge and commutation of all the power switches in the input bridge circuit, or by interrupting power transfer from the input bridge toward the inverter. In addition to sensing the filter capacitor current, the level of current supplied to the input bridge is monitored so that a sudden rise is detected and utilized to initiate the same protective functions.

REFERENCES:
patent: 3321697 (1967-05-01), Etter
patent: 3413538 (1968-11-01), Hodges
patent: 3553567 (1971-01-01), Pesce et al.
patent: 3711759 (1973-01-01), Krauthamer
patent: 3947748 (1976-03-01), Klein
patent: 4019116 (1977-04-01), Klautschek
patent: 4042871 (1977-08-01), Grubbs et al.
patent: 4066954 (1978-01-01), Vukasovic et al.

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