Thyristor converter protection method and apparatus

Details Thyristor converter protection method and apparatus Thyristor converter protection method and apparatus

1991-05-09

1992-10-13

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 57, 363 85, 363128, 323902, 361 91, H02M 7515

Patent

active

051556731

ABSTRACT:
A method and apparatus for protecting thyristors in a power converter from overvoltages. Voltage detectors determine if the forward voltage of each thyristor has increased in the converter. If such an overvoltage occurs during a predetermined period after the conduction of the thyristor, forced triggering of all the thyristors prevent damage to the thyristors.

REFERENCES:
patent: 4377835 (1983-03-01), Asplund et al.
patent: 4785388 (1988-11-01), Takahashi
Patent Abstracts of Japan, vol. 11, No. 113(E-497)[2560], Apr. 9, 1987, & JP-A-61-262077, Nov. 20, 1986, K. Ito et al., "Protecting Device for Semiconductor Element".

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