臺灣博碩士論文加值系統

在切換式電源供應技術中，切換頻率大多設計在20K赫茲到2M赫茲範圍，在許多種類的震盪器中，弛張式震盪器能提供穩定並且容易控制的時脈訊號在20K赫茲到2M赫茲範圍內。
本論文著重在分析與設計弛張式震盪器，改善系統電容充放電切換方式，並且整合不同溫度係數的電路，減少溫度對頻率的影響，提高頻率的穩定性和系統效能，接著利用震盪器產生不同相位的時脈訊號，提供控制訊號於壓電變壓器系統，最後設計應用於切換式電源供應器系統之脈衝寬度調變器。

In the field of the switching mode power supply technology, switching frequency is normally designed between 20KHz and 2MHz. Among all the integrated-circuit oscillators, the relaxation oscillator provides a controllable and stable clock signal in the studied frequency range.
This thesis focuses on analyzing and designing the relaxation oscillator. A new charging and discharging circuit presented to improve the characteristic of capacitor voltage. The circuits with different temperature coefficient are used to minimize the temperature effect on the clock signal. The performance and stability of the clock system are improved. The designed relaxation oscillator is slightly amended to generate clock signal with controlled phase, which are utilized for controlling piezo transformer systems. Also, a pulse-width modulation is implemented using the presented oscillator.

第一章 序論………………………………………………………１
１－１　研究背景與動機……………………………………１
　　１－２　內容簡介……………………………………………２
第二章　震盪器簡介………………………………………………３
　　２－１　環式震盪器…………………………………………３
　　２－２　弛張式震盪器………………………………………７
　　２－３　結論…………………………………………………10
第三章　低頻弛張式震盪器………………………………………11
　　３－１　低頻弛張式震盪器電路設計………………………11
　　３－２　系統分析……………………………………………15
　　　　３－２－１　系統架構分析……………………………15
　　　　３－２－２　系統溫度分析……………………………24
　　３－３　系統模擬……………………………………………30
第四章　佈局與實測………………………………………………38
　　４－１　佈局…………………………………………………38
　　４－２　量測結果……………………………………………40
　　４－３　結論…………………………………………………46
第五章　應用實例…………………………………………………47
　　５－１　相位控制器…………………………………………47
　　５－２　脈衝寬度調變器……………………………………68
　　５－３　結論…………………………………………………71
第六章　結論………………………………………………………72
　　６－１　總結…………………………………………………72
　　６－２　未來展望……………………………………………73
參考文獻

[1] L. Dai, R. Harjani, “Design of low-phase-noise CMOS ring oscillators,” IEEE Analog and Digital Signal Processing, vol.49, no.5, pp.328-338, May. 2002.
[2] R. E. Best, “Phase-locked loops design, simulation and applications,” McGraw-Hill 2003
[3] H. H. Chang, S. P. Chen, and S. I. Liu, “A shifted-averaging VCO with precise multiphase outputs and low jitter operation,” Solid-State Circuits Conference, pp.647-650, Sep. 2003.
[4] Y. Liu, S. Chen, M. Nakayama, K. Watanabe, “Limitations of a relaxation oscillator in capacitance measurements,” IEEE Instrumentation and Measurement, vol.49, No.5, pp.980-983, Oct. 2000.
[5] M. H. Shakiba, T. Sowlati, “Automatic swing control in relaxation oscillators,” IEEE Journal of Solid-State Circuits, vol.33, No.12, pp.1979-1986, Dec, 1998.
[6] R. C. Hans, “Redesigning the old 555 timer circuit,”IEEE Spectrum, vol.34, No.9, pp.80-85, Sep. 1997.
[7] A. Nathan, I. A. Mckay, I. M. Filanovsky, A. P. Baltes,“Design of a CMOS oscillator with magnetic-field frequency modulation,” IEEE Journal of Solid-State Circuits, vol.22, No.2, pp.230-232, Apr. 1987.
[8] J. Popovic, A. Pavasovic, D. Vasiljevic,“Low-power CMOS current-conveyor relaxation oscillators,” IEEE Frequency Control Symposium, 50th, pp.681-688, June 1996.
[9] T. Zaitsum, T. Shigehisa, T. Inoue, M. Shoyama and T. Ninomiya, “Piezoelectric transformer converter with frequency control,” IEEE Applied Power Electronics Conference, pp.568-572, 1997.
[10] T. Zaitsu, T. Shigehisa, M. Shoyama and T. Ninomiya, “Piezoelectric transformer converter with PWM control,” IEEE Applied Power Electronics Conference, pp.279-283, 1996.
[11] 黃朝巖 “壓電式背光反流器系統控制晶片”中華民國九十三年六月,國立台灣大學電子工程學研究所碩士論文
[12] 梁適安, “高頻交換式電源供應器設計,”全華出版社, 中華民國九十一年二月.
[13] A.I.Pressman, “Switching Power Supply Design,” McGraw-Hill, 1991.
[14] M. Siripruchyanun, P. Wardkein,“Low-voltage high-speed PWM generations based on relaxation oscillator,” Asia-Pacific Conference Circuits and Systems, vol.2, pp.371-374, Oct, 2002.