101. Analysis and Design of LLC Converter Considering Output Voltage Regulation Under No-Load Condition.
- Author
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Kim, Jong-Woo, Park, Moo-Hyun, Lee, Byoung-Hee, and Lai, Jih-Sheng
- Subjects
ELECTRICAL conductivity transitions ,ELECTRIC potential ,GOVERNMENT regulation ,RESONANT power convertors ,ELECTRIC current converters ,VOLTAGE control ,CASCADE converters - Abstract
In the no-load condition, LLC converter usually fails to regulate its output voltage although it operates at a high switching frequency. Till now, it is hard to obtain the exact relationship between design parameters and the maximum switching frequency for no-load regulation capability. In this paper, a specific criterion for no-load regulation of LLC converter is provided, without using active components or other modulation schemes. By analyzing the macroscopic switching period and microscopic switching transition in the no-load condition, it is shown that not only the peaking resonant current during the switching transition, but also the resonant tank design affect the no-load regulation of the LLC converter, which affects the no-load regulation capability. Furthermore, the relationship among design parameters is analyzed and the design guideline is also provided to achieve no-load regulation at the specified maximum switching frequency. To verify the effectiveness of the proposed design, 400 V input and 50 V/200 W output prototype is built and tested. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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