An IPOS LLC Converter with Current Sharing Capability

An input-parallel output-series (IPOS) LLC converter with current sharing capability is proposed for high voltage gain applications. A coupled transformer is utilized to balance the output voltages. To achieve current sharing between modules, a wire bridge structure is proposed. To further balance the current inside a module, a compensation inductor and delay control is proposed. A 200kHz 100V/1.2kV 3.6kW two-module prototype is constructed to verify proposed structure, which shows good current sharing performance and a peak efficiency up to 97.5%.