Method and apparatus for firing angle control of series connecte

Details Method and apparatus for firing angle control of series connecte Method and apparatus for firing angle control of series connecte

1985-04-25

1987-01-27

Wong, Peter S.

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

With automatic voltage magnitude control

363 50, 323207, H02M 5257

Patent

active

046398511

ABSTRACT:
To eliminate thyristor failure due to voltage imbalance across series-connected thyristors during reverse voltage recovery caused by current discontinuity under continuous pulse application to the thyristors, the continuous pulse is discontinued after a time interval of application which is a function of the control signal establishing the firing delay angle. The continuous pulse is reinstated as in a double-pulse mode, thereafter, with the same controlled duration.

REFERENCES:
patent: 3882371 (1975-05-01), Shimer et al.
patent: 4028609 (1977-06-01), Detering
patent: 4100434 (1978-07-01), Iyotani et al.

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