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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...
Converter transient response is mainly limited by filter LC delay time, controller delay time and propagation delay time. It is a tradeoff between efficiency and transient response in the design. In isolated DC/DC converter, the bandwidth of opto-coupler has an extra strong effect on the system bandwidth improvement. This paper presents current injection method, switching mode current injection circuit...
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