POWER CONVERSION DEVICE

• Main Author: MATSUI YOSHINORI
• Format: Patent
• Language: English; Japanese
• Published: 24.10.2019
• 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

To protect a power conversion device having a semiconductor switching element while continuously performing power conversion even when the device is affected by an increase in ambient temperature or cooling water temperature.SOLUTION: The power conversion device comprises: an inverter circuit 1 that has a plurality of semiconductor switching elements 1a to 1d; a transformer 2 that steps up or down a voltage output from the inverter circuit; a rectifier circuit 3 that is provided in a subsequent stage of the transformer; a switching control unit 5 that controls the semiconductor switching element; a core temperature measurement unit 62 that measures the core temperature of the transformer; and a core temperature determination unit 51 that determines whether the core temperature measured by the core temperature measurement unit 62 is equal to or higher than a predetermined first threshold value. When the core temperature determination unit 51 determines that the core temperature is equal to or higher than the first threshold value, the switching control unit 5 increases the drive frequency of the semiconductor switching element.SELECTED DRAWING: Figure 1 【課題】半導体スイッチング素子を有する電力変換装置において、雰囲気温度又は冷却水温度の上昇による影響を受けても、継続的に電力変換を行いながら電力変換装置を保護する。【解決手段】複数の半導体スイッチング素子１ａ〜１ｄを有したインバータ回路１と、インバータ回路により出力された電圧を昇圧または降圧するトランス２と、トランスの後段に設けられた整流回路３と、半導体スイッチング素子を制御するスイッチング制御部５と、トランスのコア温度を測定するコア温度測定部６２と、コア温度測定部６２により測定されたコア温度が所定の第一閾値以上か否かを判定するコア温度判定部５１とを備え、コア温度判定部５１がコア温度を第一閾値以上と判定した場合、スイッチング制御部５は半導体スイッチング素子の駆動周波数を上昇させる。【選択図】図１