| Power factor correction (PFC) technology widely used in more and more applicationfield of national production.In order to balance the input power and induce the ripplevoltage of PFC applications an electrolytic capacitor must be used. But the electrolyticcapacitors have far more limited life and reality which lead to reduce the PFC powergeneration seriously.Based on the reseach of the correlation literature, this paper had made the compare ofvarious kinds method of PFC electrolytic capacitorless power. Finally, focused on theparallel active compensation with Buck/Boost converter method, and it is be designed aPFC power for large power and low operation frequency electrodeless lamp. It is showedthat Buck/Boost converter is controlled by constant duty-cycle, how to compensate theripple power. Then the math relationship between the ripple voltage and the constantduty-cycle has been showed. Two methods of controlling the Buck/Boost convertor beapplied, which is emply used in projects.Characteristics and transfer functions of LC-C type and LCC type ballasts forelectrodeless lamp are given and compared, and LC-C ballasts for electrodeless lamp beendriven by electrolytic capacitorless PFC power.To verify the performance of the proposed control theory and simulation, a200WPFC power without electrolytic capacitor for electrodeless lamp had been implemented.The experiment results proved the theory and simulation is correct. |
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