| Summary: | 碩士 === 崑山科技大學 === 電機工程研究所 === 102 === In order to decrease the switching losses of main switch and maintain high conversion efficiency, a zero-voltage transition (ZVT) soft-switching (SS) technique is applied to the conventional boost rectifier. Therefore, the proposed ZVT boost rectifier, controlled by constant on-time mode control (COTMC) method, is operated in critical conduction mode (CRM) and regarded as power factor correction (PFC) circuit in this thesis. It would comply with the international current standards IEC 61000-3-2 Class D on power factor and input current distortions of power supplies. Moreover, its output voltage can be well regulated against the input voltage and load variations.
The operating principle, components design and small-signal model derivation of the proposed rectifier are presented herein. Therefore, a controller can be well designed for the ZVT HPF boost rectifier with IC FAN7530 to have the performance of output voltage regulation in the presence of input line peak voltage and output load variations. Moreover, when the main switch of the proposed ZVT HPFC boost rectifier can be achieved ZVS condition under turn-on transition, the driving signals of the main switch and auxiliary switch must be well designed based on the PWM driving signal offered by IC FAN7530.
Finally, the CRM HPF boost rectifier and SS CRM HPF boost rectifier are built based on COTMC IC FAN7530 with the specifications of universal input voltage , output voltage , rated power 300 W. It reveals from experimental results that both of the two implemented rectifiers herein exhibit the performances of high power factor and output voltage regulation despite the variations of the peak line voltage and load resistances. Furthermore, according to the measurements of power efficiency, it shows that the ZVT HPF boost rectifier has the highest efficiency of 97.1 %, which is more than that the highest efficiency of 95.5 % for the BCM HPF boost rectifier.
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