Method and arrangement to commutate the current between turn-off

Details Method and arrangement to commutate the current between turn-off Method and arrangement to commutate the current between turn-off

1989-02-14

1990-04-24

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 58, H02M 7521

Patent

active

049204734

ABSTRACT:
A method and apparatus for commutating a load-independent current between the valve arms of a static converter device. Each valve arm has a valve device with blocking capability in the reverse direction, and a valve damping circuit. The valve device of a current-assuming valve arm is actuated at the time of commutation, and the valve device of the current-delivering valve arm reaches a zero current level upon commutation. In order to prevent a dangerous overvoltage via the inductance of the valve damping circuit, actuation of the valve device in the current-assuming valve arm is delayed until the valve device in the current-delivering valve arm substantially attains a zero current level after being turned off. During this delay, the current can commutate to the valve damping circuit of the current-delivering valve arm and generate a positive voltage there, thus expediently avoiding a reverse current and its dangerous consequences.

REFERENCES:
patent: 4597038 (1986-06-01), Stacey
patent: 4641231 (1987-02-01), Walker et al.
patent: 4674023 (1987-06-01), Peppel et al.
patent: 4682278 (1987-07-01), Marquardt et al.
patent: 4775925 (1988-10-01), Lezan et al.

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