Normalized Analysis and Design of DCM-LCC Resonant Converter Based on Critical Current Mode
Zhang Hongyin1, Tong Chaonan1, Wang Zeting2
1.School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing 100083 China; 2.Power Electronics and Motor Drives Engineering Research Center Beijing North China University of Technology Beijing 100144 China
Abstract In order to study the gain characteristic of the LCC series-parallel resonant converter operated in discontinues current mode (DCM), a normalized model of the LCC resonant tank under different working modes was established through the two parameters of resonant tank gain and resonant capacitance ratio. By introducing the principle of conservation of energy and critical current mode (CRM), a normalized resonant element parameter design model based on CRM was deduced. This model is accurate and simple, making it helpful to design the converter conveniently. The resulting description was subsequently used for the derivation of a design procedure that the frequency-gain characteristic curve of the LCC resonant tank under different modes, which is convenient to predict the output characteristics of resonant tank. Then taking a high-voltage power supply prototype with a rated output of 6kW/6kV for instance, this paper presents the specific design procedure in detail conducts experiments to test the parameter design. The experimental results verify the accuracy of the normalized design model of the resonant elements established. Moreover, the consistency of the calculation, simulation and experiment for the tank’s voltage gain curves corresponds well and verifies the validity of the proposed frequency-gain characteristic curves.
Zhang Hongyin,Tong Chaonan,Wang Zeting. Normalized Analysis and Design of DCM-LCC Resonant Converter Based on Critical Current Mode[J]. Transactions of China Electrotechnical Society, 2019, 34(1): 103-115.
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2019, Vol. 34 
