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1 Digital Plug-In Repetitive Controller for SinglePhase Bridgeless PFC Converters Abstract: This paper investigates a plug-in repetitive control scheme for bridgeless power factor correction (PFC) converters to mitigate input current distortions under continuous conduction mode and discontinuous conduction mode operating conditions. From the PFC converter model and the fact that a type-II compensator is used, a design methodology to maximize the bandwidth of the feedback controller is suggested. After that, the error transfer function including the feedback controller is derived, and the stability of the repetitive control scheme is evaluated using the error transfer function. The implementation of the digital repetitive controller is also discussed. The simulation and experimental results show that the input current THD is significantly improved by using the proposed control scheme for a 1-kW single-phase bridgeless PFC converter prototype. INTRODUCTION: RIDGELESS power factor correction (PFC) converters which do not have a diode bridge B rectifier have been extensively used in many applications due to high efficiency and simple control features [1]-[3]. For the control of a bridgeless PFC converter, either an analog or a digital controller can be employed, and most of the traditional control strategies for boost PFC converters can be directly applied for controlling the bridgeless PFC converter. Generally, a digital control scheme can easily implement various control logics and sequences for the converter operation as well as interfacing an upper level controller in convenient. One problem of the digital control scheme for the bridgeless PFC converter, however, is that the current control bandwidth cannot be as high as an analog controller due to the digital delay effects caused by the digital pulse-width modulation (DPWM) delay and the digital computation delay. Accordingly, the performance of the input current regulation with a digital controller is relatively poorer than the case with an analog controller implementation. www.frontlinetechnologies.org [email protected] +91 7200247247 2 Architecture Diagram: CONCLUSION This paper discussed the plug-in repetitive control scheme for the bridgeless PFC converter. To do this, the design procedure for the feedback and the feed-forward controllers was discussed. After that, the proposed repetitive controller was designed to handle the current distortion near the ZCP of the input voltage and the input current as well as compensating the current harmonic components. The stability analysis for the PFC converter including the proposed control scheme was performed. From this analysis, the control parameters for the repetitive controller were selected. By using the designed repetitive controller, the current distortion could be mitigated both in CCM and in DCM operations. Both the simulation and experimental results verified the effectiveness of the proposed control scheme under various operating conditions including transient and steady-state operations for the 1-kW bridgeless PFC converter prototype. References: 1. B. SuandZ. Lu, “Aninterleavedtotem-poleboostbridgeless rectifierwith reduced reverse-recovery problems for power factor correction,” IEEE Trans. Power Electron., vol. 25, no. 6, pp. 1406-1415, Jun. 2010. 2. L. Huber, Y. Jang, and M. M. Jovanovic, “Performance evaluation of bridgeless PFC boost rectifiers,” IEEE Trans. Power Electron., vol. 23, no. 3, pp. 1381-1390, May 2008. 3. G.-G. Park, K.-Y. Kwon, and T.-W. Kim, “PFC dual boost converter based on input voltage estimation for DC inverter air conditioner,” J. Power Electron., vol. 10, no. 3, pp. 293-299, May 2010. 4. K. P. Louganski andJ.-S. Lai, “Currentphaselead compensationin singlephase PFC boost converters with a reduced switching frequency to line frequency ratio,” IEEE Trans. Power Electron., vol. 22, no. 1, pp. 113119, Jan. 2007. www.frontlinetechnologies.org [email protected] +91 7200247247 3 5. D. M. V. d. Sype, K. D. Gusseme, A. P. M. V. d. Bossche, and J. A. Melkebeek, “Duty- ratio feedforward for digitally controlled boost PFC converters,” IEEE Trans. Ind. Electron., vol. 52, no. 1, pp. 108-115, Feb. 2005. 6. K. D. Gusseme, D. M. V. d. Sype, A. P. M. V. d. Bossche, and J. A. Melkebeek, “Input- current distortion of CCM boost PFC converters operated in DCM,” IEEE Trans. Ind. Electron., vol. 54, no. 2, pp. 858-865, Apr. 2007. 7. X. Zhang and J. W. Spencer, “Analysis of boost PFC converters operating in the discontinuous conduction mode,” IEEE Trans. Power Electron., vol. 26, no. 12, pp. 3621-3628, Dec. 2011. 8. F.-Z. Chen and D. Maksimovic, “Digital control for improved efficiency and reduced harmonic distortion over wide load range in boost PFC rectifiers,” IEEE Trans. Power Electron., vol. 25, no. 10, pp. 2683-2692, Oct. 2010. 9. K. D. Gusseme, D. M. V. d. Sype, A. P. M. V. d. Bossche, and J. A. Melkebeek, “Digitally controlled boost power-factor-correction converters operating in both continuous and discontinuous conduction mode,” IEEE Trans. Ind. Electron., vol. 52, no. 1, pp. 88-97, Feb. 2005. 10. S.F. Lim and A. M. Khambadkone, “A simple digital DCM control scheme for boost PFC operating in both CCM and DCM,” IEEE Trans. Ind. Appl., vol. 47, no. 4, pp. 1802-1812, Jul./Aug. 2011. www.frontlinetechnologies.org [email protected] +91 7200247247