Abstract
CLLC resonant converters have the advantages of bidirectional power transmission, natural soft switching, and wide output voltage range. However, CLLC resonant converters still suffer from the light-load problems of unsatisfying voltage regulation and low efficiency. This paper analyzed the multiple phase-shift control of CLLC converters based on a multi-harmonic impedance model, and designed a dual phase-shift control for light-load operation, which can effectively regulate the output voltage and improve the light-load efficiency. A multi-harmonic impedance model of full-bridge CLLC resonant converter was first established. Based on this model, the light-load voltage gain and root-mean-square (rms) values of resonant currents under multiple phase-shift control were solved, and the effects of different phase-shifts on the light-load output voltage and resonant currents were analyzed. Then, a dual phase-shift control method was designed, achieving reliable voltage gain adjustment and lowering the light-load power loss. Finally, a 21.5V/400V, 200W full-bridge CLLC resonant converter experimental prototype was built. The experimental results demonstrated the accuracy of proposed multi-harmonic impedance model and the effectiveness of designed dual phase-shift control under light-load conditions.
| Translated title of the contribution | Analysis and Design of Multiple Phase-shift Control for CLLC Resonant Converter Under Light-load Conditions Based on Multi-harmonic Impedance Model |
|---|---|
| Original language | Chinese (Traditional) |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 41 |
| Issue number | 1 |
| Pages (from-to) | 326-339 |
| Number of pages | 14 |
| ISSN | 0258-8013 |
| DOIs | |
| Publication status | Published - 5 Jan 2021 |
Bibliographical note
Publisher Copyright:© 2021 Chin. Soc. for Elec. Eng.