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이일운(Il-Oun Lee),이동영(Dong-Young Lee),조보형(Bo-Hyung Cho) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In this paper, the improved zero-voltage transition(ZVT) PWM boost converter using an inductor feedback technique is proposed. The improved circuit uses a low-voltage zener diode to reduce the turn-off switching loss of the auxiliary switch and EMI noise. Using this technique, soft-switching for the auxiliary switch is guaranted at wide line and load ranges and some of the energy circulating in the auxiliary circuit is fed to the load. Since the active switches are turned on and off softly, the switching losses and EMI noise are reduced significantly and the higher efficiency of the system is achieved. In this paper, the modes of converter operation are explained and analyzed, design guidelines are given, and experimental results of 1kW, 100kHz prototype system are presented.
ZVS Full-bridge 컨버터의 ZVS 공진 에너지 불평형 문제와 해결 방법
이동영(Dong-Young Lee),이일운(Il-Oun Lee),조보형(Bo-Hyung Cho) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
ZVS Full-bridge converter is widely used in medium power level(l~3kW). ZVS can be designed within a limited load range and ZVS failure at light load condition is assumed to be acceptable within the given efficiency and thermal constraints. However, unbalanced ZVS resonant energy caused by dc blocking capacitor may alleviate the switching loss problem at light load condition. ZVS resonant energy is unbalanced by dc blocking capacitor. This problem causes loss and heat concentration of a switch leg. In this paper, this problem is analyzed, and a novel control method is proposed to solve the problem.