Title:
UNINTERRUPTIBE POWER SOURCE HAVING BACKUP CIRCUIT
Document Type and Number:
Japanese Patent JP3758910
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To attain uninterrupted state by a battery of a DC output switching power source.
SOLUTION: Respective phases of voltages U-W inputted into a converter are formed, so that two phases have the same polarities and the other phase has the reverse polarity at respective periods T1-T6, when one period T is divided into six equal period T1-T6. This uninterruptibe power source with a backup circuit using a battery consists of a capacitor 1 connected in parallel with an input power source, a primary input circuit formed so that a series circuit consisting of the primary coil 12 of a transformer 2 and a first switching element 3 are connected in parallel with the capacitor 1, a rectifier diode 4, a battery 6 with a reverse-current blocking diode 5, a secondary switching element 8, and a secondary output circuit formed so that a smoothing circuit consisting of a diode 9, a reactor 10, and capacitor 11 is connected in parallel with a secondary coil 13 of the transformer 2. The switching cycles of the first and second switching elements 3, 8 are synchronized by PWM control circuits 7, 12 and are controlled by independent duties respectively.
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Inventors:
Nobuo Shishikura
Application Number:
JP25493099A
Publication Date:
March 22, 2006
Filing Date:
September 08, 1999
Export Citation:
Assignee:
Densei Lambda Co., Ltd.
International Classes:
H02M7/21; H02M3/28; H02M7/12; (IPC1-7): H02M7/21; H02M7/12
Domestic Patent References:
| JP58139675A | ||||
| JP8033328A |
Attorney, Agent or Firm:
Takeo Masuda