Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1991-11-15
1993-09-14
Voeltz, Emanuel T.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 89, 363124, 323207, 323222, H02M 7155, G05F 170
Patent
active
052455220
ABSTRACT:
A power supply includes a rectifying section for rectifying a sinusoidal a.c. voltage, a switching section for receiving a voltage output from the rectifying section, and a smoothing section having a smoothing capacitor. The power supply is controlled to have a sinusoidal load current and includes a power source circuit having a first path for conducting current from the rectifying section to the smoothing section and a second path for conducting current from an inductor of the switching section to the smoothing section, circuits for sensing the current flowing through the first path and forming a reference current with a target waveform based on the sensed current, circuits for sensing the current flowing through the switching element and determining a conduction ratio of the switching element to match the waveform of the sensed current to the waveform of the reference current, and a control circuit for sequentially controlling a plurality of switching elements connected in parallel based on the determined conduction ratio.
REFERENCES:
patent: 4688162 (1987-08-01), Match et al.
Ishii Makoto
Kawaguchi Yasutsugu
Hitachi , Ltd.
Voeltz Emanuel T.
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