Applying FPGA to Fully-Digitalized PFC Rectifier without ADC Sampling Technique

• Main Authors: Yuan-Chou Chang, 張源洲
• Other Authors: Kuo-Ing Hwu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/e4329t

碩士 === 國立臺北科技大學 === 電機工程系研究所 === 100 === As generally recognized, in order to realize the fully-digitalized PFC rectifier, several analog-to-digital converters (ADCs) are indispensable. However, one high-performance ADC is costly. Consequently, a fully-digitalized PFC rectifier without ADC sampling is presented. As for the digital output voltage information, it is obtained by injecting the triangular wave into the sensed output voltage, comparing this resultant signal with the output voltage reference, and counting the low level of the resulting signal based on the counter in the FPGA. As for the digital inductor current information, it is obtained by comparing the sawtooth wave with the sensed inductor current after filtering, and counting the low level of the resulting signal based on the counter in the FPGA. On the other hand, the sinusoidal reference command for the current controller is obtained by triggering the sinusoidal table in the FPGA, via the zero crossing detecting circuit. And, this sinusoidal reference command, together with the traditional average current control method, generates a suitable control effort to drive the power switch such that the output voltage is controlled at a desired value and at the same time the input current follows the input voltage as tightly as possible. In this thesis, some simulated results, based on Matlab/Simulink combined with Active-HDL, are provided to demonstrate the feasibility of the proposed fully-digitalized PFC rectifier. Finally, some experimental results, based on the FPGA used as a control kernel, are offered to verified its effectiveness.