To be able to suppress an increase of loss due to the fluctuation of a power to be supplied to a load.SOLUTION: A power-supply unit for an electric vehicle comprises: a resonance type inverter which includes a first resonance capacitor, and a switching element for cutting off an electric current flowing in a resonant circuit, and generates a first alternating-current power from a direct-current power through resonance of the resonant circuit and periodical switching of the switching element; a transformer which comprises at least a first coil and a second coil that are magnetically coupled together, and which is included in the resonant circuit as a part thereof, in which a first alternating-current power generated by the resonance type inverter 3 is supplied to the first coil, and a second alternating-current power converted from the first alternating-current power is supplied from the second coil to a load; and an impact suppression unit which causes the resonance type inverter to perform soft switching to fit a frequency difference between the resonance frequency of the resonant circuit and a switching control frequency within a predetermined range so that at least the electric current flowing in switching operation to the first coil or the second coil is equal to or lower than a specified value.SELECTED DRAWING: Figure 1A
【課題】負荷に供給する電力の変動によって生じる損失の増大を抑制することができる。【解決手段】電気車用電源装置の共振型インバータは、第1共振コンデンサと、共振回路に流れる電流を遮断するスイッチング素子とを含み、前記共振回路の共振と前記スイッチング素子の周期的なスイッチングとにより前記直流電力から第1交流電力を生成する。変圧器は、少なくとも磁気結合された第1巻線と第2巻線とを備え、前記共振回路の一部に含まれ、前記第1巻線には前記共振型インバータ3によって生成された第1交流電力が供給され、前記第1交流電力を変換した後の第2交流電力を前記第2巻線から負荷に供給する。影響抑制部は、少なくとも前記第1巻線又は前記第2巻線にスイッチングされる際に流れる電流が所定値以下になるように、前記共振回路の共振周波数とスイッチング制御周波数との差を所定の範囲に収めて前記共振型インバータをソフトスイッチングさせる。【選択図】図1A
POWER-SUPPLY UNIT FOR ELECTRIC VEHICLE
電気車用電源装置
2019-06-06
Patent
Electronic Resource
Japanese
IPC: | H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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