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An Extensive I/P Voltage and Fixed Frequency of Single-Stage AC/DC LLC Resonant Converter

P. Ganesh, T. Manokaran, M. Sudha


In this paper design of a single-stage LLC resonant converter are presented. A single-stage converter uses only one control signal to drive two power converters, a power factor corrector (PFC) converter and a dc/dc converter, for reducing the cost of the system. However, this simplicity induces power imbalance between two converters, and then, the bus voltage between two converters drifts and becomes unpredictable. To ensure that the bus capacitor voltage can be kept in a tolerable region, the characteristics of a PFC converter and an LLC tank are investigated, and then, a design procedure is proposed correspondingly. Finally, a single-stage LLC resonant converter is implemented to verify the analysis.


AC–DC Power Conversion, LLC Resonant Power Conversion

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G.Moschopoulos and P. Jain, “Single-phase single-stage power- factor corrected converter topologies,” IEEE Trans. Ind. Electron., vol. 52, no. 1, pp. 23–35, Feb. 2005.

Q. Mei, G. Moschopoulos, H. Pinheiro, and P. Jain, “Analysis and design of a single stage power factor corrected full-bridge converter,” in Proc. Appl. Power Electron. Conf. Expo., Mar. 1999, pp. 119–125.

F. Zhang and C. Gong, “A new control strategy of single-stage flyback inverter,” IEEE Trans. Ind. Electron., vol. 56, no. 8, pp. 3169–3173, Aug. 2009.

Y.-M. Liu and L.-K. Chang, “Single-stage soft-switching AC–DC converter with input-current shaping for universal line applications,” IEEE Trans. Ind. Electron., vol. 56, no. 2, pp. 467–479, Feb. 2009.

C. S.Moo, K. H. Lee, H. L. Cheng, andW.M. Chen, “A single-stage highpower- factor electronic ballast with ZVS buck–boost conversion,” IEEE Trans. Ind. Electron., vol. 56, no. 4, pp. 1136–1146, Apr. 2009.

L. Yan and G. Moschopoulos, “A single-stage AC–DC forward converter with input power factor correction and reduced DC bus voltage,” in Proc. Telecommun. Energy Conf., Oct. 2003, pp. 132–139.

P. Das, S. Li, and G. Moschopoulos, “An improved AC–DC singlestage full-bridge converter with reduced DC bus volt,” IEEE Trans. Ind. Electron., vol. 56, no. 12, pp. 4882–4893, Dec. 2009.

M. S. Agamy and P. K. Jain, “A three-level resonant single-stage power factor correction converter: Analysis, design, and implementation,” IEEE Trans. Ind. Electron., vol. 56, no. 6, pp. 2095–2107, Jun. 2009.

D. D.-C. Lu, H. H.-C. Iu, and V. Pjevalica, “Single-stage AC/DC boost– forward converter with high power factor and regulated bus and output voltages,” IEEE Trans. Ind. Electron., vol. 56, no. 6, pp. 2128–2132, Jun. 2009.

C. M. Lai, R. C. Lee, T.W.Wang, and K. K. Shyu, “Design and implementation of a single-stage LLC resonant converter with high power factor,” in Proc. IEEE Int. Symp. Ind. Electron., Jun. 2007, pp. 455–460.

B. C. Kim, K. B. Park, C. E. Kim, B. H. Lee, and G. W. Moon, “LLC resonant converter with adaptive link-voltage variation for a high-powerdensity adapter,” IEEE Trans. Ind. Electron., vol. 25, no. 9, pp. 2248– 2252, Sep. 2010.

STMicroelectronics, Application Note LLC Resonant Half-Bridge Converter Design Guideline, Mar. 2007.

F. Dianbo, K. Pengju, W. Shuo, F. C. Lee, and X. Ming, “Analysis and suppression of conducted EMI emissions for front-end LLC resonant DC/DC converters,” in Proc. Power Electron. Spec. Conf., Jun. 2008, pp. 1144–1150.


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