Title:
UNINTERRUPTIBLE POWER SUPPLY DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/077698
Kind Code:
A1
Abstract:
In this uninterruptible power supply device, a bidirectional chopper (5) includes a first IGBT (Q1) for storing the DC power generated by a converter (2) into a battery (22) and a second IGBT (Q2) for supplying the DC power of the battery to an inverter (8). A control circuit (7) drives the first IGBT at a first frequency (fH) when a commercial AC power supply (21) is healthy, and drives the second IGBT at a second frequency (fL) lower than the first frequency in response to the occurrence of a power failure of the commercial AC power supply. Accordingly, it is possible to reduce the switching loss occurring in the second IGBT.
Inventors:
TOYODA MASARU (JP)
Application Number:
PCT/JP2017/037711
Publication Date:
April 25, 2019
Filing Date:
October 18, 2017
Export Citation:
Assignee:
TOSHIBA MITSUBISHI ELEC IND (JP)
International Classes:
H02J9/06; H02J7/00
Domestic Patent References:
| WO2016092613A1 | 2016-06-16 | |||
| WO2010100737A1 | 2010-09-10 |
Foreign References:
| JPH07298516A | 1995-11-10 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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