Multilevel capacitor-clamped DC-DC boost converter structure with soft-switching technique implementation for high power density achievement
This research presents the proposed 4-level capacitor-clamped DC-DC boost converter (CCBC) with soft-switching implementation for high power density achievement. The proposed 4-level CCBC has an ability to reduce the size and volume of passive components and have similar characteristics with the con...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/564/1/24p%20MOHD%20AMIRUL%20NAIM%20KASIRAN.pdf http://eprints.uthm.edu.my/564/2/MOHD%20AMIRUL%20NAIM%20KASIRAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/564/3/MOHD%20AMIRUL%20NAIM%20KASIRAN%20WATERMARK.pdf |
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| Summary: | This research presents the proposed 4-level capacitor-clamped DC-DC boost converter (CCBC) with soft-switching implementation for high power density achievement. The proposed 4-level CCBC has an ability to reduce the size and volume of passive components and have similar characteristics with the conventional DC-DC converter. Principally, the inductance and inductor volume are directly proportional with each other as well as the capacitance and capacitor volume. By considering high switching frequency, passive components’ volume can be reduced. Thus, the converter volume of the proposed 4-level CCBC can be reduced greatly when high switching frequency is applied. However, the switching devices suffer high semiconductor losses when hard-switching technique is used. Consequently, the cooling device volume is increased as well. Due to this problem, this study also proposes soft-switching technique in the 4-level CCBC for semiconductor loss reduction. The combination of optimum design of passive components and cooling devices may lead to the highest power density of the proposed converter. A 400 W of the 4-level CCBC converter is designed and experimentally verified. The result shows that with the inductor current ripple fixed at 1.04 A, the required inductances of the proposed 4-level CCBC and conventional boost converters are 0.11 mH and 1 mH, respectively, where the reduction of inductances is 80.75%. Consequently, the volume of inductor in the 4-level CCBC is reduced by considering the same switching frequency as the conventional DC-DC boost converter. The efficiency of the 4-level CCBC in hard-switching and soft-switching techniques for switching frequency of 500 kHz are 94.81% and 95.38%, respectively. On the other hand, by considering the Pareto-Front method, the achieved maximum power density of the proposed soft-switching technique for the 4-level CCBC is 6.51 kW/dm3 at 800 kHz switching frequency with efficiency of 97.20%. Thus, the maximum high power density and efficiency of the proposed soft-switching technique for 4-level CCBC are determined in this study. |
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