Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1988-07-14
1990-06-05
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 8, 363 48, 318771, H02M 545
Patent
active
049319191
ABSTRACT:
A system for converting variable frequency multiple phase current into multiple phase current of constant frequency with a neutral having a multiple phase inverter with a neutral (N) is disclosed. A first input (34) is connected to the multiple phase inverter for receiving pulses of a positive polarity. A second input (36) is connected to the multiple phase inverter for receiving pulses of a negative polarity. A variable frequency multiple phase source (12, 14 and 16) of alternating current applies current to a multiple phase transformer (80, 142 and 180). Current from the transformer is applied to a full-wave rectifier (96) which has a first group of diodes (112) which applies the positive pulses to the input (34). A second group of diodes (116) applies the negative pulses to the input (36). The ripple frequency f.sub.r present on the inputs to the multiple phase inverter with neutral is twice the frequency present in the prior art which permits the capacitance of filter capacitors (74, 76) to be reduced to permit effective shunting of the undesired ripple frequency f.sub.r to the neutral which results in a weight savings and lessening of energy at the ripple frequency f.sub.r being coupled to the inverter (38).
REFERENCES:
patent: 3109976 (1963-11-01), Sichling
patent: 3324374 (1967-06-01), Corey
patent: 3988660 (1976-10-01), Ruch et al.
patent: 4314322 (1982-02-01), Plow et al.
patent: 4555751 (1985-11-01), Koga et al.
patent: 4651266 (1987-03-01), Fujioka et al.
patent: 4675802 (1987-06-01), Sugimoto
patent: 4686619 (1987-08-01), Edwards
patent: 4716515 (1987-12-01), Alexander
Radio Amateurs Handbook, 1978, p. 5-5.
Dhyanchand John J.
Nguyen Vietson M.
Sundstrand Corp.
Wong Peter S.
LandOfFree
System for converting variable frequency multiple phase alternat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for converting variable frequency multiple phase alternat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for converting variable frequency multiple phase alternat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-496065