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Average current mode control of series-switching post-regulators used in power factor correctors

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5 Author(s)
Villegas, P.J. ; Dept. de Eng. Electr., Electron. de Comput. y Sistemas, Oviedo Univ., Spain ; Sebastian, J. ; Hernando, M. ; Nuno, F.
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The application of the average current mode control (ACMC) to a new type of very efficient post-regulator is studied in this paper. This post-regulator, called series-switching post-regulator (SSR), has been proposed to improve the dynamic response series-switching of power factor correctors (PFC), The post-regulator exhibits very high efficiency due to the fact that only a part of the total power undergoes a power conversion process. Using ACMC, the bandwidth of the post-regulator increases in relation to the one obtained when a conventional voltage-mode control (with or without feedforward) is used. As a result, the attenuation of the input voltage ripple (100-120 Hz) increases and, a lower bulk capacitor can be used to obtain a low voltage ripple at the output, which is extremely important when a battery is connected at the output. This is rather common in distributed power supply systems

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Power Electronics, IEEE Transactions on  (Volume:15 ,  Issue: 5 )