DESIGN OF BIDIRECTIONAL CASCADE MULTIPHASE BOOST-BUCK DC-DC CONVERTER UNDER DISCONTINOUS CONDUCTION MODE

• Main Author: Ryan Pakpahan, Hans
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66614
• Institution: Institut Teknologi Bandung

ABSTRACT DESIGN OF BIDIRECTIONAL CASCADE MULTIPHASE BOOST-BUCK DC-DC CONVERTER UNDER DISCONTINOUS CONDUCTION MODE Hans Ryan Pakpahan Penetration of renewable energy for reducing global warming gives result to microgrid DC as being more suitable electrical system. Electric vehicle batteries can be used to solve the problem of intermittency of renewable energy generation. This application needs bidirectional DC-DC converter as interface between electric vehicle battery and DC microgrid. Two important performance parameters in this application are minimum battery side current ripple and efficiency. To minimize current ripple, a multiphase DC-DC converter topology can be used with an additional cascade converter as a regulator of power flow and voltage level. The multiphase Boost-Buck cascade DC-DC converter suits this application. Under continuous conduction mode (CCM) operation, major power loss comes from inductor internal DC resistance. In order to reduce inductor’s DC resistance power loss DCM operation with smaller size of inductor is proposed. Furthermore, DCM operation provides zero current switching operation which decrease switching power loss. However, a particular strategy is needed to suppress the input current ripple. Laboratory experiment proves that DCM operation has improved efficiency compared to CCM operation with maximum efficiency of 92,97%. Keywords: Discontinous Conduction Mode, Boost-Buck, Efficiency.