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Cascaded Dual-Buck Inverter With Reduced Number of Inductors
Institute of Electrical and Electronics Engineers 2018 IEEE transactions on power electronics Vol.33 No.4
<P>A dual-buck inverter (DBI) possesses no shoot-through worries and can boost efficiency by using power <SMALL>mosfet</SMALL> s. The main drawback of a DBI is the use of more inductors than in a traditional full-bridge inverter. This greater number of inductors decreases the power density and increases system cost. In this paper, a modified cascaded full-bridge DBI is proposed. It retains all the advantages of the conventional cascaded full-bridge DBI, possesses no shoot-through issues, and can be operated with no pulse-width-modulation dead-times. It can be implemented with power <SMALL>mosfet</SMALL> without reverse recovery issues of a body diode to boost efficiency. The cascaded modules in the proposed inverter share current limiting inductors. Therefore, the number of inductors and inductor footprints, the complexity of the circuit layout, required inductance, and magnetic volume can all be decreased. To show the advantages of the proposed inverter, detailed theoretical analysis and experimental results are provided.</P>
A Transformer-Coupled, Series-Resonant Topology for the Induction Heating of Aluminum Cookware
Andrew Amrhein,Jih-Sheng (Jason) Lai 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Induction heating of aluminum cookware is difficult due to its low resistivity and lack of ferromagnetic properties. Both of these factors result in an effective impedance reflected through the work coil that is too low for practical inverter design and makes efficient coil design difficult. This paper presents a transformer-coupled topology as a means of efficiently delivering the desired amount of power into such low-impedance induction heating loads while keeping the inverter design within practical constraints. This topology consists of a conventional series-load-resonant coil/capacitor circuit. A high-frequency transformer is then used to the couple the series-resonant load to a full-bridge inverter, removing the constraint between load impedance and inverter design. The proposed circuit is built and its operation is experimentally verified.
Design and Efficiency Analysis 48V-12V Converter using Gate Driver Integrated GaN Module
김종완,최중묵,유세프알라브,제이슨라이,Kim, Jongwan,Choe, Jung-Muk,Alabdrabalnabi, Yousef,Lai, Jih-Sheng Jason The Korean Institute of Power Electronics 2019 전력전자학회 논문지 Vol.24 No.3
This study presents the design and experimental result of a GaN-based DC-DC converter with an integrated gate driver. The GaN device is attractive to power electronic applications due to its superior device performance. However, the switching loss of a GaN-based power converter is susceptible to the common source inductance, and converter efficiency is severely degraded with a large loop inductance. The objective of this study is to achieve high-efficiency power conversion and the highest power density using a multiphase integrated half-bridge GaN solution with minimized loop inductance. Before designing the converter, several GaN and Si devices were compared and loss analysis was conducted. Moreover, the impact of common source inductance from layout parasitic inductance was carefully investigated. Experimental test was conducted in buck mode operation at 48 -12 V, and results showed a peak efficiency of 97.8%.