A variable-structure DCDC conversion topology suitable for a fuel cell is formed by connecting two paths of improved Buck-Boost converters in parallel through a capacitor C1 and a switch S5, the topology can be controlled to enter a step-down mode, a step-up mode and a high-gain mode respectively by adjusting the two paths of switches of the converters, high gain, low voltage stress and low switching loss of an EDR step-up topology are kept, and the conversion efficiency of the EDR step-up topology is improved. And the input voltage range and the interphase current sharing area of the EDR boost topology are expanded. Compared with a traditional Buck-Boost topology, the Buck-Boost topology has the advantages that the input voltage range is wider, the current ripple is lower, and the voltage ripple is lower; compared with an Extended Duty Ratio (EDR) topology, a step-down function is added, and the defect that the EDR topology can only achieve the highest voltage gain and automatic current sharing in a specific duty ratio area is overcome through switching of a step-up mode and a high-gain mode; compared with a multi-phase parallel double-active bridge topology, the multi-phase parallel double-active bridge topology has the advantages that fewer components are used, and the structure is simpler.

    一种适用于燃料电池的可变结构DCDC变换拓扑,该拓扑由两路改进型的Buck‑Boost变换器通过电容C1和开关S5并联而成,通过调节变换器的两路开关,可控制拓扑分别进入降压、升压和高增益模式,保留EDR升压拓扑高增益、低电压应力和低开关损耗,扩展了EDR升压拓扑的输入电压范围和相间均流区域。相比于传统Buck‑Boost拓扑,本发明具有更宽的输入电压范围、更低的电流纹波和更低的电压纹波;相比于Extended Duty Ratio(EDR)拓扑,本发明增加了降压功能,并通过升压和高增益模式的切换避免了EDR拓扑仅能在特定占空比区域实现最高电压增益和自动均流的缺点;相比于多相并联双有源桥式拓扑,本发明使用的元器件更少,结构更简单。


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    Title :

    Variable-structure DCDC conversion topology suitable for fuel cell vehicle


    Additional title:

    一种适用于燃料电池汽车的可变结构DCDC变换拓扑


    Contributors:
    WEI LI (author) / YAN WEN (author)

    Publication date :

    2022-04-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    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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