Publication: Design and implementation of a multilevel inverter fed low voltage isolated dc-dc converter
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Date
2012-06-01
Authors
Chan, Su Yan
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Abstract
DC-DC converter is growing rapidly to become one of the significant solutions for a wide range of applications. Fundamental DC-DC converters such as buck converter, boost converter and buck-boost converter are simple but the output voltage of these converters is not isolated electrically. Therefore, isolated DC-DC converter is designed. Both the DC-AC and AC-DC converter are implemented together with the presence of transformer to provide electrical isolation between input and output power. Full bridge converter is one of the isolated converters which can operate at ZVS and produce isolated DC output. However, the component stress of power switches in full bridge converter is equals to the input voltage. When input voltage is increased, it results in higher voltage rating of power switches which increases the production cost. Consequently, multilevel topologies are proposed in inverter technology to overcome this challenge. In flying capacitor multilevel inverter, the voltage across the power switches is reduced to half of input voltage. This thesis proposes and implements a three-level flying capacitor inverter based isolated low voltage DC-DC converter on printed circuit board. The operating principle of circuit and experimental result of this converter are presented. The results show that the prototype is operating with ZVS and the maximum voltage across power switches is only half of input voltage.