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A Comparison between Quasi-Z-Source Inverter and Active Quasi-Z-Source Inverter
Truong-Duy Duong,Minh-Khai Nguyen,Young-Cheol Lim,Joon-Ho Choi,D. Mahinda Vilathgamuwa 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents some comparative results between the three-phase quasi-Z source inverter (qZSI) and active quasi-Z source inverter (AqZSI). An improved PWM method is proposed for AqZSI. The voltage gain can be increased by using the shoot-through duty cycle and the switching ratio of the additional switch. Compared to qZSI, AqZSI with improved PWM strategy has a higher efficiency at the boost mode. Furthermore, AqZSI can be operated up to a higher modulation index and it boasts a lower inductor current ripple and reduced shoot-through current. The analysis of inverter and the improved PWM strategy are discussed. An experimental prototype with output power of 600 W is built to show the agreement of theory and measurement.
Switched-Capacitor-Based Dual-Switch High-Boost DC–DC Converter
Nguyen, Minh-Khai,Duong, Truong-Duy,Lim, Young-Cheol Institute of Electrical and Electronics Engineers 2018 IEEE transactions on power electronics Vol.33 No.5
<P>A switched-capacitor-based dual-switch dc–dc converter with a high-boost voltage gain is proposed in this paper. The proposed converter can obtain a high-voltage gain with a small duty cycle, which decreases the voltage stress and the conduction loss on the power switches. This paper presents the key waveforms, the operating principles at the continuous conduction mode and the discontinuous conduction mode, and the parameter design. Moreover, a comparison between the proposed converter and other nonisolated converters has been completed. To verify the operating principle, a 200 W prototype is constructed with an input voltage of 25–50 V and an output voltage of 200 V. The simulation and experimental results are shown.</P>
Active CDS-Clamped L-Type Current-Fed Isolated DC-DC Converter
Nguyen, Minh-Khai,Duong, Truong-Duy,Lim, Young-Cheol,Choi, Joon-Ho The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.4
In this paper, an active capacitor-diode-switch (CDS) snubber is proposed for L-type current-fed isolated DC-DC converters. The proposed CDS-clamped converter has a number of advantages. It can achieve wide range zero-voltage switching (ZVS) on two switches, a continuous input current with a low ripple, a reduction of one active switch and high efficiency. The operating principles, analysis and parameter design guideline are presented. A 300 W prototype is built to test the proposed converter. Simulation and experimental results are shown at 30 V input voltage and 400 V output voltage.
Isolated Boost DC–DC Converter With Three Switches
Nguyen, Minh-Khai,Duong, Truong-Duy,Lim, Young-Cheol,Kim, Yong-Jae IEEE 2018 IEEE TRANSACTIONS ON POWER ELECTRONICS - Vol.33 No.2
<P>This paper documents a new three-switch, isolated boost dc-dc converter. The major features of the proposed converter are as follows: 1) continuous input current; 2) reduced one active switch, one additional diode, and one additional capacitor; 3) unchanged primary and secondary voltage waveforms of the transformer when the duty cycle is changed; and 4) removal of the snubber circuit. This paper presents the operating principles, analysis, parameter design guidelines, and simulation results for the proposed converter. To verify the performance of the proposed converter, a 400 W prototype was constructed with a 40-60 V dc input. A PID controller was used to maintain the dc output voltage at 400 V. The simulation and experimental results matched those of the theoretical analysis.</P>
Switched-Capacitor Quasi-Switched Boost Inverters
Nguyen, Minh-Khai,Duong, Truong-Duy,Lim, Young-Cheol,Kim, Yi-Gon Institute of Electrical and Electronics Engineers 2018 IEEE transactions on industrial electronics Vol.65 No.6
<P>In this paper, two switched-capacitor quasi-switched boost inverters (qSBIs) are proposed. By adding one capacitor and one diode to the qSBIs, the proposed inverters achieve high voltage gain with low voltage stress on active switches, capacitors, and diodes. The proposed inverters can extend to <I>n</I>-cell for voltage gain improvement. The operating principle, steady-state analysis, and impedance parameter selections of the proposed inverter are presented. A full comparison between the proposed inverter and other impedance-source inverters is addressed. A 500-W prototype is built to verify the operating theory of the proposed inverter in both the standalone mode and the grid-connected mode. Simulation and experimental results validate the theoretical analysis.</P>
Active CDS-Clamped L-Type Current-Fed Isolated DC-DC Converter
Minh-Khai Nguyen,Truong-Duy Duong,임영철,최준호 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.4
In this paper, an active capacitor-diode-switch (CDS) snubber is proposed for L-type current-fed isolated DC-DC converters. The proposed CDS-clamped converter has a number of advantages. It can achieve wide range zero-voltage switching (ZVS) on two switches, a continuous input current with a low ripple, a reduction of one active switch and high efficiency. The operating principles, analysis and parameter design guideline are presented. A 300 W prototype is built to test the proposed converter. Simulation and experimental results are shown at 30 V input voltage and 400 V output voltage.