A low-cost unidirectional dc/dc converter with galvanic isolation for fuel cell electric vehicles is presented in this article. To satisfy the requirements of the fuel cell stack and powertrain system of heavy-duty vehicles, three operation modes: boost, buck-boost, and buck, are proposed. To achieve ZVS operation for low voltage side switching devices, a novel platform current control mechanism is introduced. With the help of the platform current controller, the zero-voltage-switching operation is independent of the input/output voltage ratio. Meanwhile, the near zero-current-switching can be achieved for low voltage side switches under boost mode. The steady-state analyses and small-signal models for both input and platform currents under boost mode are provided. The prototype unit is built, and the corresponding experiments are presented.

中文翻译：

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适用于燃料电池电动汽车的宽范围单向隔离 DC-DC 转换器


本文介绍了一种用于燃料电池电动汽车的具有电流隔离的低成本单向 DC/DC 转换器。为了满足重型汽车燃料电池堆和动力总成系统的要求，提出了升压、降压-升压和降压三种工作模式。为了实现低压侧开关器件的 ZVS 操作，引入了一种新颖的平台电流控制机制。借助平台电流控制器，零电压开关操作与输入/输出电压比无关。同时，低压侧开关在升压模式下可实现近零电流开关。提供了升压模式下输入电流和平台电流的稳态分析和小信号模型。搭建了样机，并进行了相应的实验。