POWER CONVERSION DEVICE

• Main Author: KIDERA KAZUNORI
• Format: Patent
• Language: English; Japanese
• Published: 01.11.2018
• 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; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To provide a power conversion device which has respective bridge circuits on the primary side and the secondary side of an isolation transformer and in which the adjustment range of output current during the step-down is improved.SOLUTION: A control circuit 15 performs power conversion by controlling the phase difference between the switching phases of a plurality of switching elements on a first bridge circuit 11 and the switching phases of a plurality of switching elements on a second bridge circuit 12, so as to control the phase difference to be small when the output voltage is to be reduced, and controls, when the phase difference has reached a predetermined lower limit value in step-down of the input voltage, the ON time of the plurality of switching elements on the second bridge circuit 12 to be short in a state where the phase difference is fixed to the lower limit value.SELECTED DRAWING: Figure 1 【課題】絶縁トランスの１次側と２次側にそれぞれブリッジ回路が設けられる電力変換装置であって、降圧時における出力電流の調整範囲が改善された電力変換装置を提供する。【解決手段】制御回路１５は、第１ブリッジ回路１１の複数のスイッチング素子のスイッチング位相と、第２ブリッジ回路１２の複数のスイッチング素子のスイッチング位相との位相差を制御して電力変換し、出力電力を低下させるときに位相差を小さく制御し、入力電力の降圧時に位相差が予め定められた下限値に達した場合、位相差を下限値に固定した状態で、第２ブリッジ回路１２の複数のスイッチング素子のオン時間を短く制御する。【選択図】図１