AC/AC CONVERTER - HITS LAB CORP I

Title:

AC/AC CONVERTER

Document Type and Number:

WIPO Patent Application WO/1997/047070

Kind Code:

A1

Abstract:

An AC/AC converter includes first to sixth AC switches. A series of the first and second AC switches and a series of the third and fourth switches are connected in parallel with each other between both ends of an AC input. One end of the primary winding of a transformer is connected to the node of the first and second AC switches and the other end to the node of the fourth and third AC switches. One end of the secondary winding of the transformer is connected to one end of the fifth AC switch and the other end one end of the sixth AC switch. The other ends of the fifth and sixth AC switches are connected to one of the output terminals and the mid point of the secondary winding to the other. The AC/AC converter further includes a control means which alternately operates a group of the first, third, and fifth AC switches and a group of the second, fourth, and sixth AC switches at a frequency higher than that of the input. The AC input repeatedly and alternately flows through the primary winding of the transformer in different directions at a frequency which is sufficiently higher than that of the AC input. Namely, the AC input is converted into an AC of a higher frequency. An arbitrary voltage proportional to the turn ratio of the transformer appears on the secondary side of the transformer at the higher frequency. On the secondary side, the direction of the AC is again controlled by means of the secondary-side AC switches which operate synchronously with the primary-side AC switches and the waveform of the AC closely resembles or is similar to the original waveform. Since a high frequency is impressed upon the transformer, the size of the transformer is reduced and the efficiency of the transformer is improved.

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Inventors:

SUZUKI YASUNOBU (JP)
SUGAWARA ISAO (JP)

Application Number:

PCT/JP1996/001538

Publication Date:

December 11, 1997

Filing Date:

June 06, 1996

Export Citation:

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Assignee:

HITS LAB CORP I (JP)
CHIYODA CHEM ENG CONSTRUCT CO (JP)
SUZUKI YASUNOBU (JP)
SUGAWARA ISAO (JP)

International Classes:

H02M5/22; H02M7/217; (IPC1-7): H02M5/293

Foreign References:

JPH0315913A	1991-01-24
JPH07255172A	1995-10-03
JPH05122935A	1993-05-18

Other References: