Turn-off control means for an ac-to-dc electric power converter

Details Turn-off control means for an ac-to-dc electric power converter Turn-off control means for an ac-to-dc electric power converter

1982-09-30

1983-12-13

Truhe, J. V.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Running-speed control

318248, 318344, 318345C, 363 68, H02P 512, H02M 7155

Patent

active

044207131

ABSTRACT:
In the propulsion system of an electric locomotive, a-c wayside power is converted to direct current for the traction motors by a plurality of phase-controlled rectifying circuits having serially connected outputs. To improve power factor, forced commutation means is provided for turning off the controllable valves in one of the circuits at a desired "extinction angle." This angle is varied with motor speed, but its effective range of variation is restricted so as to avoid undesired leading power factor at low speeds, to optimize power factor when the locomotive is running at full power, and to prevent misoperation when the level of load current is low.

REFERENCES:
patent: 3392319 (1968-07-01), McColl et al.
patent: 3792325 (1974-02-01), Beger
patent: 3849718 (1974-11-01), Forster et al.
patent: 4088937 (1978-05-01), Uchida et al.
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patent: 4181932 (1980-01-01), Fujiwara
patent: 4263557 (1981-04-01), Jarvinen
patent: 4288729 (1981-09-01), Anzai et al.
patent: 4306283 (1981-12-01), Kiwaki et al.
patent: 4375076 (1983-02-01), Magnusson et al.

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