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系統識別號 U0026-2108201712060400
論文名稱(中文) 小型脈衝功率之除鏽裝置
論文名稱(英文) Rust Remover Using Small Pulsed-Power System
校院名稱 成功大學
系所名稱(中) 太空與電漿科學研究所
系所名稱(英) Institute of Space and Plasma Sciences
學年度 105
學期 2
出版年 106
研究生(中文) 黃梅鳳
研究生(英文) Mei-Feng Huang
學號 LA6044038
學位類別 碩士
語文別 英文
論文頁數 71頁
口試委員 指導教授-張博宇
口試委員-陳秋榮
口試委員-陳孝輝
中文關鍵字 脈衝功率系統  觸發脈衝產生器  間隙開關 
英文關鍵字 Pulsed-power system  Marx generator  Trigger pulse generator  Spark gap switch 
學科別分類
中文摘要 現今工業快速發展當中,鐵製品已經大量的存在我們生活當中。然而,首當其衝的問題是,鐵製品容易生鏽。因此,此篇論文研究主題,希望透過建立一個小型的脈衝功率系統來達成除鏽的目的。我們利用集膚效應(skin effect)的原理,將一個短脈衝、高功率的電流傳遞到有鏽的金屬表面,藉此將能量釋放到金屬表面,將鏽從固態加熱至汽態蒸發,完成除鏽的功能。我們的小型脈衝功率系統內部包含兩個40 nF的電容串聯,將電容分別充到 ±8 kV儲存2.56 J的能量。為了製作小型的脈衝功率系統,我們建製了一個耐壓達 20 kV 的間隙開關(spark gap switch),及一個使用汽車點火線圈製作而成的脈衝觸發產生器,提供上升時間(rise time,定義為四分之一週期)為 55.0±0.4 μs、輸出電壓為 -18 kV 觸發脈衝訊號。此小型脈衝功率系統最後可輸出一個上升時間為 5.2 ± 0.2 μs,最高輸出電流為 15.9 ± 0.6 kA的脈衝電流,相對應的系統電感值、電阻值及鐵表面的集膚深度(skin depth)分別為 212 ± 85 nH、1.00 ± 0.04 Ω、0.4μm,電流的角頻率為(4.9 ± 0.1 ) x 106 sec-1。系統的總放電時間為11 μs,估算出系統的總輸出平均功率為230 kW。我們預期每一次的放電(discharge)將可以除去面積約1.8 cm x 1.8 cm 的鏽。我們針對相同的鐵鏽放電了至少 2500 次,然而,效果並不如預期,並沒有觀察到顯著的除鏽效果。推測原因是因為能量不止只有釋放到鐵鏽的表面,還有釋放到了電流流經系統放電迴路中所有的金屬表面上。但是藉由此結果可以知道,未來我們實驗室將要建立的脈衝功率系統,其中的金屬導線不會因為大電流的放電而被侵蝕。
英文摘要 A rust remover was built using a small pulsed-power system. It is very important since there are a lot of iron products that exist in our daily life. A common problem of all iron tools is that they rust. The rust remover we built is to remove rust using the skin effect of a short pulse current propagating through rusted metal surface. To provide a high current, a small pulsed-power system using two 40 nF capacitors connected in series charged to ~ ± 8 kV storing 2.56 J of total energy was built. A controlled spark gap that can hold up to 16kV voltage was built. To trigger the spark gap, a high voltage trigger pulse generator providing a -18 kV trigger pulse with 55.0 ± 0.4 μs rise time was built by using an ignition coil for cars. In this small pulsed-power system, the rise time of the current (quarter period), the calculated skin depth of iron, and the peak current are 5.2 ± 0.2 μs, 0.4 um and 15.9 ± 0.6 kA, respectively, with an fitted inductance of 212 ± 85 nH and fitted resistance of 1.00± 0.04 Ω. The oscillation frequency is (4.9 ± 0.1) x 106 sec-1. The averaged power of our pulsed-power system is about 230 kW before the output current is full damped in ~ 11 μs. Rust on an iron surface, ~1.8 cm long and ~1.8 cm wide, were expected to be removed in each discharge. More than 2500 shots on the same rusted object were conducted. Unfortunately, the result didn’t meet our expectation and no significant amount of rust was removed. The most possible reason is that the energy was released not only on the rusted surface but also on any (metal) surface along the current path. However, it shows that we don’t need to worry about the erosion on the cables in a pulsed-power system which will be built as the long term goal in our lab.
論文目次 摘要 I
Abstracts II
Contents III
Chapter 1 INTRODUCTION 1
1.1 The principle of the skin effect 1
1.2 Different kinds of rust remover 2
1.3 A rust remover using the pulsed-power system 3
Chapter 2 PULSED-POWER SYSTEMS 7
2.1 RLC circuit 7
2.2 Different methods of building a pulsed-power system 9
2.2.1 Marx generators 9
2.2.2 Linear transformation drivers 10
2.3 Switches 13
2.3.1 Paschen curve and breakdown voltage 15
2.3.2 Gas-filled Spark gaps 16
2.3.3 Krytrons 18
2.3.4 Solid-state switches 20
2.3.4.1 Bipolar Junction Transistor (BJT) 20
2.3.4.2 Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) 23
2.3.4.3 Insulated Gate Bipolar Transistor (IGBT) 25
Chapter 3 IMPLEMENT OF THE PULSED-POWER SYSTEM 29
3.1 Design of the pulsed-power system 29
3.2 The trigger pulse generator 30
3.2.1 A trigger pulse generator using a Marx generator 31
3.2.2 A trigger pulse generator using an ignition coil for cars 36
3.3 The spark gap switch 40
3.3.1 Calculated gap distance using different gas in the switch 41
3.3.2 Measurement of the relationship between the Breakdown voltage and gap distance of the switch 43
3.3.2.1 DC breakdown voltage vs gap distance 43
3.3.2.2 Breakdown voltage from the trigger pulse vs gap distance 46
3.3.2.3 Calibration of homemade high voltage probe 48
3.3.2.4 DC breakdown voltage above 5 kV vs gap distance 52
3.3.2.5 Implementation of the controlled spark gap switch 52
Chapter 4 RUST REMOVER RESULT AND DISCUSSION 55
Chapter 5 SUMMARY 62
Reference 63
Appendix 64
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[10] https://en.wikipedia.org/wiki/Skin_effect
[11] http://tw.tek.com/high-voltage-probe-manual/p6015a
[12] http://uk.rs-online.com/web/p/fibre-optic-transceivers/8188855/
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[20] http://www.electronics-tutorials.ws/power/insulated-gate-bipolar-transistor.html
[21] http://www.altium.com/
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