數位式功率因數修正器的研製

Design and Implementation of Digital-Controlled Power Factor Corrector

何恭旻(Kong-Min Ho)

指導教授 ： 賴炎生

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2009年)

摘要

本論文之目的在研製數位式功率因數修正器，本文將推導具有臨界電流模式之昇壓型轉換器的數學模型，以設計所提之數位控制器，並提出預測性電流模式控制來實現臨界電流模式之功率因數修正器。
本文利用德州儀器公司所產的數位信號處理器TMS320F2812為控制平台，驗證數位式功率因數修正器在實作及設計分析上是否正確；本文所研製的詳細規格包含輸入電壓為100 Vrms / 50Hz，輸出電壓為400Vdc，最大功率為250W，切換頻率操作在30 kHz ~ 100 kHz。
經實驗結果證實，在無載與滿載情況下輸出電壓連波為±5%，滿載下，效率可達94%以上、功率因數可達0.98以上而且電流總諧波失真在4%以下。由以上結果驗證設計與實驗的正確性。

關鍵字

功率因數修正器 ； 臨界電流模式 ； 預測電流控制

並列摘要

The objective of this thesis is to design and implement a digital-controlled power factor corrector. To design the digital controller, the mathematical model of boost converter with transition current mode control will be derived and a predictive current mode control will be proposed to realize the PFC with transition mode control.
The signal processor, TMS320F2812, TI, is used as the control platform for the verification of design and implementation. The specifications of the implemented power factor corrector include: input voltage = 100 Vrms/50 Hz, output voltage = 400 Vdc , maximum output power = 250 W, and the switching frequency varies between 30 kHz and 100 kHz.
Experimental results show that the output voltage ripple is with ± 5% of rated voltage. Moreover, it is shown that the efficiency is up to 94%, power factor is greater than 0.98, and the THD of current is less than 4%, under full load conditions. These results confirm the design and implementation.

並列關鍵字

Power Factor Corrector(PFC) ； Transition Current Mode ； Predictive Current mode control

參考文獻

[2] Texas Instruments, UC3854:High Power Factor Preregulator, Texas Instruments, U.S.A. 1999.

[3] Fairchild Semiconductor, ML4812 : ML4812 Power Factor Controller, Fairchild Semiconductor Corporation. 2001.

[4] M. Fu and Q. Chen, “A DSP based controller for power factor correction in a rectifier circuit,” Proc. of. IEEE APEC, pp. 144–149. 2001.

[5] S. Buso et al., “Simple digital control improving dynamic performance of power factor pre-regulators,” IEEE Trans. on Power Electronics., Vol. 13, pp. 814–823, Sept. 1998.

[6] J. Zhou et al., “Novel sampling algorithm for DSP controlled 2 Kw PFC converter,” IEEE Trans. on Power Electronics., Vol. 16, pp. 217–222, Mar. 2001.