線性穩壓器與切換式轉換器於可攜式應用之研製

可攜式設備在最近幾年有很大的需求，幾乎每個人都有一個可攜式設備，如手機，隨身聽…等等。可攜式設備對於人類來說已是個不可或缺的配件。在可攜式設備中有許多模組，例如天線模組處理訊號的接收與發送，顯示及背光模組使資訊可讀，而可攜式設備的核心，訊號處理單元及記憶單元與控制單元使我們的設備更具智慧。然而，如何在一顆充飽的電池中去延長使用時間是一個大問題。最常見的解決方法是加大電池容量，另一個解法則是使用電源管理單元增加能源使用效率。作者在本文提供了一個用於背光模組裡發光二極體驅動器的電流鎖定迴路，一個線性穩壓器的應用。所提出的電流鎖定迴路增加了發光二極體的精準度。此外，藉由光平衡控制方法降低了暫態時對於電源端的影響。另一個線性穩壓器的應用是並聯式穩壓器，其雙迴路架構使用的電流感測回授技術也在本文裡提出。此外，並聯式穩壓器更可以應用在無線射頻辨識標籤系統裡。本論文更提出了數位式的快速暫態響應方法在降壓轉換器上，這是一個加速型的脈波寬度調變降壓轉換器，最快暫態響應少於5微秒。為更適於可攜式應用，切換式直流-直流轉換器是一個應用在電源管理單元的鋰離子電池電源管理晶片。所提出的電路可以在同一控制模式裡實現升壓及降壓功能。

關鍵字

發光二極體驅動器；並聯式穩壓器；加速型脈波寬度調變；倍降壓轉換器；電源管理晶片；類比/數位式快速暫態控制電路；主動電流感測

並列摘要

The portable devices have a great demand in recent years, everyone almost have one of the portable devices, such as cell phone, MP3 player, etc. The portable device is indispensable equipment for human beings. In portable devices, there are many modules. For example, antenna module handles the signal receiving and sending. Display module and back light module make the information readable for people. Signal processing unit, memory unit and controlled unit which make device more intelligent are the core of portable devices. However, how to prolong the using time is a big issue in once battery life. Most solution of prolonging is the battery capacity enhancing. Another solution is adopting power management unit (PMU) to improve the power efficiency. The author provides the application of linear regulator and switching DC-DC converter on portable devices. One application of the linear regulator is the current locked loop (CLL) of LED driver in the back light module. The proposed CLL technique increases the accuracy of LED current. Moreover, with the light-balanced controlled scheme, the influence of transient response is the smallest on the output voltage node. The other application of linear regulator is shunt regulator; the dual-loop shunt regulator using current-sensing feedback techniques is proposed in this thesis. The dual-loop shunt regulator which has fast transient response can be adopted on RFID tag system. Moreover, this thesis provides a digitalized fast transient response scheme on the buck converter, that is an accelerated pulse-width-modulation buck converter. Maximum transient response is less than 5 us. For further more fitting the portable application, the switching DC-DC converter is a working in Li-ion battery power management IC in PMU application. The proposed circuit achieves the function of step-up and step-down with one mode controlled circuit.

並列關鍵字

LED Driver ； Shunt Regulator ； Acceleration-PWM ； Double/Step-Down Converter ； Power Management ICs ； Analog/Digital Fast Transient Controlled Circuits ； Active-Current-Sensing

參考文獻

[1] G. Bontempo, T. Signorelli, and F. Pulvirenti, “Low supply voltage, low quiescent current, ULDO linear regulator, “ in IEEE International Conference on Electronics, Circuits and Systems, 2001, pp. 409-412.

[2] G. W. den Besten and B. Nauta, “Embedded 5 V-to-3.3 V voltage regulator for supplying digital IC's,” IEEE Journal of Solid-State Circuits, vol. 33, no. 7, pp. 956-962, July 1998.

[3] Ka Nang Leung and P. K. T. Mok, “A capacitor-free CMOS low-dropout regulator with damping-factor-control frequency compensation,” IEEE Journal of Solid-State Circuits, vol. 38, no. 10, pp. 1691-1702, Oct. 2003.

[4] Jiann-Jong Chen, Fong-Cheng Yang, Che-Min Kung, Bao-Peng Lai, and Yuh-Shyan Hwang, “A capacitor-free fast-transient-response LDO with dual-loop controlled paths,” in IEEE Asian Solid-State Circuits Conference, 2007, pp. 364-367.

[5] Jiann-Jong Chen, Ming-Shian Lin, Ho-Cheng Lin, and Yuh-Shyan Hwang, “Sub-1V capacitor-free low-power-consumption LDO with digital controlled loop,” in IEEE Asia Pacific Conference on Circuits and Systems, 2008, pp. 526-529.

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線性穩壓器與切換式轉換器於可攜式應用之研製

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