數位控制臨界電流模式昇壓型功率因數修正器之研製

Design of Digital-Controlled Boost Power Factor Corrector with Transition Current Mode

何恭旻(Kung-Min Ho)

指導教授 ： 賴炎生

國立臺北科技大學/電資學院/電機工程系博士班/博士(2013年)

摘要

本論文旨在研製數位控制之臨界電流模式昇壓型功率因數修正器。本論文首先描述臨界電流模式昇壓型功率因數修正器的操作原理，並利用狀態空間平均法推導其連續時間下的數學模型。接著建立與實現以DSP為控制平台的數位化臨界電流模式昇壓型功率因數修正器，提出適用於各種數位脈波寬度調變的預測式電流控制，此控制模式以低取樣頻率之類比數位轉換器所取樣的電感電流與系統參數，預測下一個切換週期的時間，藉以完成零電流切換，因此，不需要零電流偵測電路與高頻電流取樣的類比數位轉換器。
其次，本論文提出具有預測式電流控制的主樸式控制器，完成交錯式臨界電流模式昇壓型功率因數修正器，並提出一新型導通時間補償的技術，來改善電流失真與完成均流控制。最後，本論文提出一種應用於預測式電流控制系統的線上參數估測方法，以解決由於預測式電流控制對於系統參數變動造成不連續電流導通與較大的電流漣波等問題，此方法只需要增加一切換週期中的電流取樣，以進行線上估測昇壓型轉換器的電感值並調整所預測之切換週期的時間，實驗結果證實本論文所提控制方式的有效性。

關鍵字

數位控制 ； 臨界電流模式 ； 預測式電流模式控制 ； 功率因數修正器

並列摘要

The main theme of this dissertation is to design and implement a digital-controlled boost power factor corrector with transition current mode (TCM). First, the operation principle of boost PFC with TCM control is described. The continuous time-domain model of boost PFC with TCM control is established by state space average method. A DSP platform for digital-controlled boost PFC based upon TCM control is set up. A family of predictive current controlled methods adapted to digital pulse-width modulations is presented. The switching period time of the proposed control is predicted by parameters of converter and sampled inductor current which is sampled by ADC with low sampling frequency in order to achieve zero current switching. Therefore, neither zero-current detector nor high-frequency A/D converter for current sampling is required for the proposed control method.

Moreover, a digital-controlled predictive current with master-slave technique for interleaved PFC with TCM control is proposed. And a new on-time compensation technique is proposed to significantly improve the slave inductor current distortion and thereby achieving current sharing control between phases. Finally, an on-line parameter tuning technique for predictive current mode control is proposed to deal with the issues of discontinuous current mode (DCM) operation and larger current ripple which are caused by parameter variation in predictive current mode control. The proposed method gives one more current sample in one sampling period in order to estimate the inductance of boost inductor on line and thereby tuning the parameter of the predicted switching period. Experimental results demonstrate the effectiveness of the proposed control method for digital-controlled boost PFC with TCM control.

並列關鍵字

Digital Control ； Transition Current Mode ； Predictive Current Mode Control ； Power Factor Corrector

參考文獻

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