UNINTERRUPTIBLE POWER SUPPLY

• Main Authors: HORIUCHI KEISUKE, KONISHI YUICHIRO, NISHIHARA ATSUO
• Format: Patent
• Language: English; Japanese
• Published: 04.04.2016
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

PROBLEM TO BE SOLVED: To make an uninterruptible power supply small-sized while preventing magnetic flux leakage of a three-phase AC reactor in the case of commercial power source abnormality.SOLUTION: While power is normally supplied from a commercial power source, a DC voltage converted by a converter is stepped down by a charging/discharging chopper and a storage battery is charged. On a prestage of the converter, switching means is provided for supplying power of the storage battery to the converter. If the commercial power source is in an abnormal state, power of the storage battery is supplied to the converter, and power of the storage battery is stepped up by a switching element forming the converter, such that the three-phase AC converter is operated as three parallel discharging choppers. At the same time, power of the storage battery is stepped up by the charging/discharging chopper and a part of discharge power is supplied. The three-phase AC reactor is included on at least one converter prestage and in the three-phase AC reactor, three coils to which a DC current from the storage battery is supplied, a magnetic leg core around which the coils are wound and at least one leg around which no coil is wound are configured in parallel (e.g., five-leg core).SELECTED DRAWING: Figure 10 【課題】商用電源異常時における三相交流リアクトルの磁束漏洩を防止した上で，無停電電源装置を小型化する。【解決手段】商用電源から正常に電力が供給されている時は，コンバータで変換された直流電圧を充放電チョッパにより降圧して蓄電池を充電し，コンバータの前段に，蓄電池の電力をコンバータに供給する切換手段を設け，商用電源が異常状態の時には，蓄電池の電力をコンバータへ供給し，コンバータを構成するスイッチング素子によって蓄電池の電力を昇圧することにより三相交流のコンバータを三並列放電用チョッパとして動作させ，同時に，充放電チョッパにより蓄電池の電力を昇圧し，放電電力の一部を供給するようにしたもので，三相交流リアクトルを少なくとも一つコンバータ前段に有し，その三相交流リアクトルは，蓄電池からの直流電流が分配される三つのコイルと，各コイルを巻回させている磁脚鉄心と，コイルを巻回させない少なくとも一つの脚とが並列に構成（例えば，五脚鉄心）される。【選択図】 図１０