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Three-level Resonant Switched Capacitor Boost Converter
Nur Banu Sagpazar,Woosik Cho(편집자),Kyuyeong Kim,Sewan Choi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The paper proposes a three-level resonant switched capacitor boost converter. The proposed converter can achieve full soft switching because of its resonant structure when switching frequency is equal to the resonant frequency. Frequency control is applied to regulate output voltage while keeping most of the soft switching features. The voltage stress on switches and diodes is low. Average voltage of the resonant capacitor (Cr) is zero, which makes its voltage rating low. Moreover, output voltage ripple of the proposed converter is very small. Low Cr voltage rating and small output voltage ripple provides smaller capacitor size, consequently higher power density for the proposed converter. The characteristics and the operation principle of the proposed converter are presented. Experimental result on a 400W prototype is provided to verify the analysis.
A New ZVS Switched-Capacitor DC-DC Converter with Low Boost Inductance
Jaehoon Kim,Sunju Kim,Nur Banu Sagpazar,Sewan Choi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a new ZVS switchedcapacitor DC-DC converter with low boost inductance. Proposed converter can reduce the boost inductance because applied voltage of the boost inductor was reduced by using flying capacitor Cf. In addition, since the operating frequency of the boost inductor Lf is doubled by shifting the phase between the switches S3 and S4, boost inductance can be further reduced. It can also achieve zero voltage switching (ZVS) turn-on of all switches using auxiliary inductor La and capacitor Ca. The operation principle, interleaving effects and design of passive components to achieve ZVS are presented. Also, comparison of different topologies is presented to shows the superior performance of the proposed converter. Experimental results on a 600W prototype are provided to validate the proposed concept. In addition, experimental waveforms of 2-phase interleaved converter suitable for high power applications are provided.