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Title:
METHOD AND DEVICE FOR AUTOMATICALLY SWITCHING THREE-PHASE VOLTAGE FOR POWER SAVING TRANSFORMER
Document Type and Number:
WIPO Patent Application WO/1998/029788
Kind Code:
A1
Abstract:
In a three-phase three-wire or four-wire auto-transformer, one set or a plurality of sets of main coils connected to an input terminal are interwound around three-phase core type cores by three circuits and a plurality of sets of exciting coils, which are wound around the cores and connected in series with each other, are connected between the end sections of the main coils of individual circuits through a plurality of combination connections. At the same time, a plurality of sets of electronic switches which are turned on/off depending upon the voltage value of a voltage sensor connected to an input or output terminal are provided between the above-mentioned end sections are provided between the above-mentioned end sections and between individual exciting coils and one set or a plurality of sets of electronic switches between the end sections and between individual exciting coils are connected or disconnected by turning on/off the switches in steps for every same phase-to-phase potential or every same current of the switches so that the circuit can be switched to a circuit which uninterruptively regulates the output voltage of the transformer. Therefore, the output voltage of the transformer can be regulated to within a prescribed set range and the load of the transformer is not affected when the input voltage rises or drops, because the rise or drop is automatically detected and the circuit is switched.

Inventors:
Shimazu, Chiyuki (Hasutoraru 6-101, 1082-1 Oomag, Urawa-shi Saitama 336, JP)
Yabase, Koji (5-7-12, Tsuji Urawa-shi, Saitama 336, JP)
Shimazu, Kunio (3819-3, Ooaza Mimuro Urawa-shi, Saitama 336, JP)
Application Number:
PCT/JP1997/001553
Publication Date:
July 09, 1998
Filing Date:
May 06, 1997
Export Citation:
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Assignee:
AIKOH ELECTRIC CORPORATION (2254, Nakao Urawa-shi, Saitama 336, JP)
Shimazu, Chiyuki (Hasutoraru 6-101, 1082-1 Oomag, Urawa-shi Saitama 336, JP)
Yabase, Koji (5-7-12, Tsuji Urawa-shi, Saitama 336, JP)
Shimazu, Kunio (3819-3, Ooaza Mimuro Urawa-shi, Saitama 336, JP)
International Classes:
H02H9/04; G05F1/14; G05F1/20; H01F29/02; H02J3/12; (IPC1-7): G05F1/20; H01F29/02; H01F33/12
Foreign References:
JPH0778035A
JPH09191574A
JPH0845752A
JPS601819A
Other References:
See also references of EP 0896269A1
Attorney, Agent or Firm:
Watanabe, Satoshi (Shimojo Building, 7 Rokubanch, Chiyoda-ku Tokyo 102, JP)
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