Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter
Patent
1991-09-09
1993-02-23
Voeltz, Emanuel T.
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By semiconductor converter
363131, 363159, 363163, H02M 522
Patent
active
051896036
ABSTRACT:
A DC-to-AC electric power converting apparatus including an invertor circuit having a plurality of switching elements, a transformer connected to the invertor circuit, and a cyclo-converter circuit for converting the frequency of the output from the transformer. A carrier signal generator is provided for generating a carrier signal of a predetermined frequency. An invertor switching circuit for controlling the switching operation of a plurality of the switching elements of the invertor circuit in synchronization with the carrier signal and switching a plurality of the switching elements of the invertor circuit in a period in which an electric current is not substantially passed through the invertor circuit; a reference voltage signal generating circuit for generating a reference voltage signal for the AC voltage to be transmitted from the cyclo-converter circuit; and a switching signal generating circuit for generating a control signal for controlling the cyclo-converter circuit in response to the reference voltage signal generated by the reference voltage signal generating circuit and the carrier signal generated by the carrier signal generator.
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Koyama Masato
Sanada Kazunori
Sashida Nobuo
Mitsubishi Denki & Kabushiki Kaisha
Voeltz Emanuel T.
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