Hybrid Modulation of Parallel Series $LLC$ Resonant Converter and Phase Shift Full Bridge Converter for a Dual Output DC DC Converter
A novel pulse frequency and phase shift hybrid modulated dual output dc dc converter is proposed in this paper. The proposed converter is composed of hybrid modulation of an input parallel output series LLC resonant converter and a phase shift full bridge (PSFB) converter. The output voltage of the LLC resonant converter is modulated by the switching frequency, whereas the output voltage of the PSFB converter is modulated by the phase angle; therefore, the two output voltages are regulated independently and free from cross regulation. The series inductor of the PSFB converter does not need to be specially designed to help achieving the soft switching operation, and the duty cycle loss could be mitigated. Zero voltage switching can be achieved on the power switches in the whole load range. Finally, a 1.2 kW 400 input 200 400 V and 48 V output prototype is built and tested to verify the effectiveness of the proposed converter.
IEEE Journal of Emerging and Selected Topics in Power Electronics