Extended Buck-Boost derived hybrid converter

Abstract

Dual output hybrid converter supplying DC and AC loads simultaneously are gaining interest due to their compact size. This is due to single stage conversion that results in cost saving and offers decoupled control of both AC and DC output. Though hybrid converter derived from boost was reported, they were unable to supply lower DC output. The hybrid converter proposed in this paper is able to supply the buck and boost dc voltage together with AC voltage. This converter is named as Buck-Boost Derived Hybrid Converter (BBDHC). The steady state analysis of the converter is presented to derive the gain of the converter. Moreover, the converter is analysed in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) which are related to inductor current nature. It is found that the BBDHC is not suitable for wide load variation as it creates the high voltage ripple in DC and distorts the AC voltage. To override these issues, the a modified converter is presented. This modification leads to CCM of the converter. The operating mode pertaining to this is named as forced continuous mode(FCM). The theoretical analysis is validated by the simulation and experimental results. © IEEE.