Title:
DC-AC POWER CONVERSION CIRCUIT
Document Type and Number:
Japanese Patent JP3759334
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a DC-AC power conversion circuit which is capable of highly efficient operation over its entire revolution range, when it is used for motor drive.
SOLUTION: For example, the series circuit of for example two capacitors 1 and 2 is connected in parallel to a DC power source, and the parallel circuit of a mechanical switch 4 and a semiconductor switch element 5, capable of bidirectional switching, is connected between one of the three-phase AC outputs of an inverter, where the semiconductor switch elements and six pairs of diodes connected in back-to-back with them are wired in bridge, and the intermediate potential point between the capacitors 1 and 2, and both switches 4 and 5 of this parallel circuit are turned off, so that the three-phase system (for high speed) of an inverter and both switches 4 and 5 of the parallel circuit are both turned off, and besides the semiconductor switch elements Ta and Tb are turned off at all times, thus this circuit is operated as a two-phase system (for low speed) of inverter.
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Inventors:
Satoshi Takizawa
Application Number:
JP15480699A
Publication Date:
March 22, 2006
Filing Date:
June 02, 1999
Export Citation:
Assignee:
Fuji Electric Device Technology Co., Ltd.
International Classes:
H02M7/48; H02M7/5387; H02P27/06; (IPC1-7): H02M7/5387; H02M7/48; H02P7/63
Domestic Patent References:
| JP4334977A | ||||
| JP11136994A |
Attorney, Agent or Firm:
Iwao Yamaguchi
Yoshihide Komada
Kiyoshi Matsuzaki
Yoshihide Komada
Kiyoshi Matsuzaki