Frequency converter, procedure for controlling it and motor cont

Details Frequency converter, procedure for controlling it and motor cont Frequency converter, procedure for controlling it and motor cont

1993-12-14

1996-06-04

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363136, H02M 545

Patent

active

055239374

ABSTRACT:
A procedure and an apparatus for converting a first alternating voltage into a second alternating voltage with respect to frequency and amplitude by means of first (1) and second (2) bridges having switches (T.sub.1 . . . T.sub.12), and a resonant circuit (3) connected between the bridges. The invention also relates to the use of a frequency converter for the control of a motor. The voltages of a supplying network and the voltages of a load (M) are connected across the resonant circuit (3) in an alternating fashion by means of bridge switches (T.sub.1 . . . T.sub.6) and bridge switches (T.sub.7 . . . T.sub.12), respectively. The voltages are alternately connected across the resonant circuit for a period equal to respective half cycles of the characteristic frequency of the resulting resonant circuit formed. When power is supplied, a bridge change is effected after each period.

REFERENCES:
patent: 4096557 (1978-06-01), Schwarz
patent: 4730242 (1988-03-01), Divan
patent: 4942511 (1990-07-01), Lipo et al.
patent: 5010471 (1991-04-01), Klaassens et al.
Kim and Cho, "New Bilateral Zero Voltage Switching AC/AC Converter Using High Frequency Partial-Resonant Link", Pub. "IECON '90", vol. II, Nov. 27-30, 1990, pp. 857-862.
Rim and Cho, "Quantum Transformation: The Analysis of Quantum Rectifier-Inverters", Pub. 1989 IEEE Industry Applications Society Annual Meeting, Part I, Oct. 1-5, 1989, pp. 1081-1085.

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