Integrated magnetic for hybrid full-bridge three-level LLC resonant converter

A novel hybrid full-bridge (H-FB) three-level (TL) LLC resonant converter with integrated magnetics (IM) is proposed in this paper, it integrates the advantages of the TL converter and the LLC resonant converter, which is very suitable for wide-input-voltage-range applications, such as fuel cell power systems, or high input voltage applications, i.e. HV input converters in wind power system. With magnetic integration, it cannot only reduce the number and size of the magnetic components, but also reduce the secondary leakage inductance compared with other LLC IM structure which can ensure the ZCS of the rectifier diodes. Two prototypes, with or without IM, of 200-400 V input and 360 V/4A output are built to verify the operation principle of the H-FB TLLLC converter with IM.

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