Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1992-11-18
1994-12-20
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 58, 363 96, 363136, H02M 7505
Patent
active
053750500
ABSTRACT:
An electrical power converter having a phase converter constituted by positive side semiconductor switching elements connected in series and negative side semiconductor switching elements connected in series which converts a DC voltage to an AC output phase voltage having at least three potential levels, resulting in three possible modulation modes: dipolar, partial dipolar and unipolar. Dipolar modulation is realized by alternating positive and negative output pulses. Unipolar modulation is realized by output pulses having only the same polarity as the corresponding fundamental modulation wave. Transition is accomplished via partial dipolar modulation which is realized by alternating positive and negative output pulses in a first period of a half cycle by outputting alternating positive and negative pulses and in a second period by outputting pulses having only the same polarity as the corresponding fundamental modulation wave. A control unit for the converter turns the semiconductor switching elements on and off depending on an input voltage amplitude command for a fundamental modulation wave. The intervals of the first and second periods in the half cycle of the AC output phase voltage varies dependent upon the voltage amplitude command.
REFERENCES:
patent: 4386396 (1983-05-01), ngquist
patent: 4953069 (1990-08-01), Braun et al.
patent: 5060129 (1991-10-01), Maruyama
patent: 5155675 (1992-10-01), Maruyama et al.
patent: 5321599 (1994-06-01), Tanamachi et al.
PESC' 88 Record, 19th Annual IEEE Power Electronics Specialists Conference, "A Novel Approach to the Generation and Optimization of Three-Level PWM Wave Forms", B. Velaerts, et al., Apr. 11-14, 1988, Doshisha University, Kyoto, Japan, vol. 2 of Two Volumes.
Nakamura Kiyoshi
Nakata Kiyoshi
Suzuki Masato
Tanamachi Tokunosuke
Terunuma Mutsuhiro
Berhane Adolf
Hitachi , Ltd.
Stephan Steven L.
LandOfFree
Electric power converter arrangement and electric rolling stock does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric power converter arrangement and electric rolling stock , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric power converter arrangement and electric rolling stock will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2389007