Title:
UNINTERRUPTIBLE POWER SUPPLY
Document Type and Number:
Japanese Patent JP3766788
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a high-efficiency, high-performance and inexpensive uninterruptible power supply which can be quickly switched by a mechanical switch without a compulsorily commutating circuit and switch a transformer to constant voltage control without detecting a status of the mechanical switch.
SOLUTION: When in a normal state, an inverter current of a DC/AC converter 7 is controlled so as to be zero. When in an abnormal state, the mechanical switch 3 is instructed to open, zero current control for the inverter current of the DC/AC converter 7 is released, and a current flowing in the mechanical switch 3 is compulsorily set to zero by the energy of the DC/AC converter 7.
Inventors:
Keiichi Oshikiri
Application Number:
JP2001190549A
Publication Date:
April 19, 2006
Filing Date:
June 25, 2001
Export Citation:
Assignee:
Toshiba Mitsubishi Electric Industrial Systems Co., Ltd.
International Classes:
H02J9/06; H02J9/00; H02M7/48; (IPC1-7): H02J9/06; H02J9/00; H02M7/48
Domestic Patent References:
| JP4117135A | ||||
| JP11341686A | ||||
| JP4137449U |
Attorney, Agent or Firm:
Toshihide Kodama
Masuo Oiwa
Takenaka Ikuo
Keigo Murakami
Masuo Oiwa
Takenaka Ikuo
Keigo Murakami