A Quarantine DC/DC Converter using High- Frequency Unstructured LLC Resonant Converter for Fuel Cell Application
نویسنده
چکیده
This paper suggests an isolated dc/dc converter using an unregulated LLC converter for fuel cell applications. The LLC converter operates as an isolated voltage amplifier with a constant voltage gain, and a nonisolated converter installed in the input stage regulates the output voltage under a wide variation of fuel cell stack voltage. By separating the functions, the unregulated LLC converter can be operated at an optimal switching condition, and the highfrequency operation of 300 kHz can be accomplished without introducing an excessive switching loss. The prototype converter with a 1-kW design (Vin = 24 48 V/Vo = 400 V) shows an efficiency of above 90.2% under a 24-V input and full load conditions.
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