Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1976-12-01
1978-06-20
Shoop, William M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
318227, H02M 112
Patent
active
040965589
ABSTRACT:
The invention relates to a method and apparatus for controlling a three-phase inverted rectifier. In this method each half wave is divided into six intervals with the third and fourth intervals forming a first zone with a constant voltage level, the second and fifth intervals forming a second zone with impulses of varying width, and the first and sixth intervals forming a third zone with impulses of varying width narrower than the impulses in the second zone. The narrower and wider impulses are treated similarly with regard to their number and have a constant width ratio as the result of a factor X. The center spacings of the narrower and wider impulses are equal. The number of impulses in each of the zones two and three is n. When n is 1.5, X should be about 0.78. Apparatus for carrying out the method includes a cycle generator, a zone signal generator which may be a ring counter, a wave train generator which may be a voltage controlled oscillator, two pulse generators and a logic section which, in dependence on the zone signals and the impulse width signals, produces switching control signals for operating the switching element of the inverted rectifier.
REFERENCES:
patent: 3376490 (1968-04-01), Osugi
patent: 3573601 (1971-04-01), Esser
patent: 3649902 (1972-03-01), Dunbar
patent: 3916285 (1975-10-01), Iwata et al.
patent: 3958171 (1976-05-01), Sekino
patent: 3971972 (1976-07-01), Stich
Danfoss A/S
Shoop William M.
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