Method and apparatus for matching turn-off times of parallel con

Details Method and apparatus for matching turn-off times of parallel con Method and apparatus for matching turn-off times of parallel con

1990-08-14

1991-09-24

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Diverse or unlike electrical characteristics

307 82, 307 86, 307242, 307633, 307640, 307645, 307 20, 363137, 361141, H02J 500, H03K 17732

Patent

active

050516035

ABSTRACT:
A power switching system for controlling the conductivity of a plurality of thyristors of the gate turn-off type (GTOs) which are connected in parallel between two power sources by gradually introducing a time compensation to force the times of turn-off of each of the thyristors toward matched values by determining the turn-off time during each conduction cycle and thereafter advancing or retarding the turn-off signal for the following conduction cycle to correct for the difference in turn-off times. A difference signal is generated between time of turn-off of an average current of the thyristors and the time of turn-off of an individual current in one of the thyristors from which a time advance or delay signal is added to the thyristor turn-off signal in response to the current flowing in a capacitor type integrator. This allows the turn-off times to reach a perfect match during periods in which the current is the same for several cycles.

REFERENCES:
patent: 3633046 (1972-01-01), Dewey
patent: 4612561 (1986-09-01), Kimura et al.
patent: 4831288 (1989-05-01), Chida et al.
patent: 4926306 (1990-05-01), Ueda et al.

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