Means for controlling a forced commutated ac-to-dc electric rect

Details Means for controlling a forced commutated ac-to-dc electric rect Means for controlling a forced commutated ac-to-dc electric rect

1982-12-29

1984-08-21

Shoop, William M.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 81, 363 88, 363128, H02P 1300

Patent

active

044674082

ABSTRACT:
A phase-controlled ac-to-dc rectifying circuit includes a pair of alternately conducting main controllable electric valves and cyclically operative forced commutation means for turning off the main valves. The forced commutation means comprises a pair of auxiliary controlled rectifiers respectively connected, in circuit with a commutating capacitor, across the main valves, and the auxiliary rectifiers are alternately turned on in response to periodic trigger signals that are normally produced by associated control means. Protective means is provided for inhibiting the trigger signals when the magnitude of voltage across the commutating capacitor is lower than a critical level which depends on the magnitude of the current being conducted by the main valves, thereby avoiding a risk of commutation failure due to low capacitor voltage.

REFERENCES:
patent: 3935528 (1976-01-01), Brenneisen et al.
patent: 4039923 (1977-08-01), Vukasovic

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