The invention discloses a boost-buck DC-DC converter of a quasi-Z-source structure for a fuel cell vehicle, and relates to the field of DC-DC converters. The problems that an existing converter is low in voltage conversion ratio, the buck-boost range is widened in a cascade and hybrid mode, the size is large, and the efficiency is low are solved. The DC-DC converter can work in a boost state and a buck state, a wide boost range and a wide buck range are both considered, and the requirement for a wide boost-buck range of an automobile fuel cell automobile is met. The normal working duty ratio of the converter is dlt; when a high boost range is needed, the converter does not work at a limit duty ratio, and the problem of efficiency reduction caused by the limit duty ratio is avoided. The inductor L1 in the converter is always connected with the positive electrode end of the fuel cell, continuous input current is provided, the influence of overlarge current ripples on the service life of the fuel cell can be effectively avoided, and the converter is suitable for the fuel cell automobile.
一种用于燃料电池汽车的准Z源结构的升降压DC‑DC变换器,涉及DC‑DC变换器领域。解决了现有变换器存在电压转换比低,采用级联和混合的方式拓宽升降压范围又存在体积大效率低的问题。本发明的DC‑DC变换器能够工作于升压与降压两种状态,兼顾宽升压范围与宽降压范围,满足汽车燃料电池汽车较宽的升降压范围的要求。变换器的正常工作占空比为d<0.5,当需要高升压范围时,变换器不会工作于极限占空比,避免了由此带来的效率下降问题。本发明的变换器中电感L1始终与燃料电池正极端相连,具有连续的输入电流,能够有效避免过大电流纹波对燃料电池寿命造成影响,本发明适用于燃料电池汽车。
Buck-boost DC-DC converter of quasi-Z-source structure for fuel cell vehicle
一种用于燃料电池汽车的准Z源结构的升降压DC-DC变换器
2022-03-04
Patent
Elektronische Ressource
Chinesisch
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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