| Summary: | 碩士 === 國立中正大學 === 電機工程研究所 === 102 === This thesis presents design and implementation of an interleaved bi-directional charger/discharger for dc distribution system. A four-phase interleaved bi-directional dc-dc converter is adopted. Switching frequency modulation method is introduced in this converter to reduce circulation loss. The converter is operated in discontinuous conduction mode to reduce inductor volume and increase power density. Moreover, this thesis presents an optimal negative current control to reduce reactive power loss. The proposed control can achieve zero-voltage switching for the active switches in the bi-directional converter. A Renesas RX62T microprocessor realizes most of the functions, which include circuit protection, generation of PWM signals and A/D conversion. If the DC link has enough energy to supply load, the converter operates in buck mode to charge the battery. On the other hand, if the DC link voltage drops below the nominal value, and the battery voltage is still above the lower limit, the converter operates in boost mode to transfer the energy back to DC link. Finally, an interleaved bi-directional DC/DC converter has been implemented to verify the feasibility and characteristics of the converter.
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