基于tl494逆變電源設計(論文)-資料下載頁

【導讀】關速度快、無二次擊穿、熱穩定性好的優點而組合設計的電路。路、過熱保護電路、DC/AC變換電路、振蕩電路、全橋電路。保護以及過熱保護等功能。該電源的制造成本較為低廉，實用性強，可作。為多種便攜式電器通用的電源。

　　

【正文】 rce, path impedances, differential mode current and load impedance are also shown in Fig. 1. B. Common mode conducted interference Common mode noise or interference could appear and impose between the lines, cables or connections and mon ground. Any leakage current between load and mon ground could be modeled by interference voltage source. Fig. 2 demonstrates the mon mode interference source, mon mode currents Icm1 and Ic m2 and the related current paths ??9 . The power electronics converters perform as noise source between lines of the supply work. In this study differential mode of conducted interference is particularly important and discussion will be continued considering this mode only. III. ELECTROMAGNETIC COMPATIBILITY REGULATIONS Application of electrical equipment especially static power electronic converters in different equipment is increasing more and more. As mentioned before, power electronics converters are considered as an important source of electromagic interference and have corrupting effects on the electric works 33 ??2 . High level of pollution resulting from various disturbances reduces the quality of power in electric works. On the other side some residential, mercial and especially medical consumers are so sensitive to power system disturbances including voltage and frequency variations. The best solution to reduce corruption and improve power quality is plying national or international EMC regulations. CISPR, IEC, FCC and VDE are among the most famous anizations from Europe, USA and Germany who are responsible for determining and publishing the most important EMC regulations. IEC and VDE requirement and limitations on conducted emission are shown in Fig. 3 and Fig. 4 ??7 ??9 . For different groups of consumers different classes of regulations could be plied. Class A for mon consumers and class B with more hard limitations for special consumers are separated in Fig. 3 and Fig. 4. Frequency range of limitation is different for IEC and VDE that are 150 kHz up to 30 MH z and 10 kHz up to 30 MHz respectively. Compliance of regulations is evaluated by parison of measured or calculated conducted interference level in the mentioned frequency range with the stated requirements in regulations. In united European munity pliance of regulation is mandatory and products must have certified label to show covering of requirements ??8 . 34 IV. ELECTROMAGNETIC CONDUCTED INTERFERENCE MEASUREMENT A. Line Impedance Stabilization Network (LISN) 35 1Providing a low impedance path to transfer power from source to power electronics converter and load. 2Providing a low impedance path from interference source, here power electronics converter, to measurement port. 36 37 Variation of LISN impedance versus frequency with the mentioned topology is presented in Fig. 7. LISN has stabilized impedance in the range of conducted EMI measurement ??7 . Variation of level of signal at the output of LISN versus frequency is the spectrum of interference. The electromagic patibility of a system can be evaluated by parison of its interference spectrum with the standard limitations. The level of signal at the output of LISN in frequency range 10 kHz up to 30 MHz or 150 kHz up to 30 MHz is criterion of patibility and should be under the standard limitations. In practical situations, the LISN output is connected to a spectrum analyzer and interference measurement is carried out. But for modeling and simulation purposes, the LISN output spectrum is calculated using appropriate software. 參考文獻 [1] Mohan, Undeland, and Robbins, ―Power Electronics Converters, Applications and Design‖ 3rd edition, John Wiley amp。 Sons, 2021. [2] P. Moy, ―EMC Related Issues for Power Electronics‖, IEEE, Automotive Power Electronics, 1989, 2829 Aug. 1989 pp. 46 – 53. [3] M. J. Nave, ―Prediction of Conducted Interference in Switched Mode Power Supplies‖, Session 3B, IEEE International Symp. on EMC, 1986. [4] Henderson, R. D. and Rose, P. J., ―Harmonics and their Effects on Power Quality and Transformers‖, IEEE Trans. On Ind. App., 1994, pp. 528532. [5] I. Kasikci, ―A New Method for Power Factor Correction and Harmonic Elimination in Power System‖, Proceedings of IEEE Ninth International Conference on Harmonics and Quality of Power, Volume 3, pp. 810 – 815, Oct. 2021. [6] M. J. Nave, ―Line Impedance Stabilization Networks: Theory and Applications‖, RFI/EMI Corner, April 1985, pp. 5456. [7] T. Williams, ―EMC for Product Designers‖ 3rd edition 2021 Newnes. [8] B. Keisier, ―Principles of Electromagic Compatibility‖, 3rd edition 38 ARTECH HOUSE 1987. [9] J. C. Fluke, ―Controlling Conducted Emission by Design‖, Vanhostrand Reinhold 1991. [10] M. Daniel,‖DC/DC Switching Regulator Analysis‖, McGrawhill 1988 [11] M. J. Nave,‖ The Effect of Duty Cycle on SMPS Common Mode Emission: theory and experiment‖, IEEE National Symposium on Electromagic Compatibility, Page(s): 211216, 2325 May 1989. 39 基于壓降型 PWM 開關電源的建模、仿真和減少傳導性電磁干擾 摘要： 電子設備 之 中 雜亂 的輻射或 者 能量叫做電磁干擾 (EMI)。 尤其是 在開關電源中 的 電力電子轉換器經常高速切換 時 ，雖然提高了 工作 效率，卻導致 轉換器 產生了電磁干擾。在這篇論文 之 中介紹了各種各樣的傳導干擾， 電磁干擾 規章 以及 傳導性 電磁干擾 的測量。 如果電子設備的電磁干擾符合 國家或 者國際 規 章稱 為電磁兼容性（ EMC）。電力電子系統生產商一定要重視 電子設備的 電磁兼容性。電磁兼容性評估的第一步就是建模和仿真。在這篇論文中提出了基于壓降型 脈寬調制 開關電源的 電磁干擾 仿真結果。為了提高 電子設備的 電磁兼容性 ,在論文中 介紹了一些技術， 并且 通過仿真提高了 電子設備的工作 效率。 關鍵字 ：傳導， 電磁兼容性 ， 電磁干擾 ， 線路阻抗穩定網絡 ，開關電源 一 .前言 在電力電子領域中，快速半導體的出現使高速度，高頻率的開關切換成為了可能 [ 1]。高速的開關造成設備的重量和體積的減少，但與此同時這也造成了一些不利的影響，比如無線頻率的干擾 [2]。生產商將生產的產品投放到市場，遵守電磁兼容性規章是必要的。在設計階段考慮電磁兼容性問題是非常重要的 [3]。在開發產品前，建模和仿真是分析電磁兼容性最有效的工具。許多以前的研究都有涉及到電力電子元件的低頻分析 [4~5]。不同類型的電力電子轉換器都能夠被用來當做電磁的干擾源。電磁干擾源可以通過輻射和傳導兩種方式來傳播。線路阻抗穩定網絡被用來測量和計算電磁干擾影響的程度 [6]。線路阻抗穩定網絡輸出的干擾頻譜被引為電磁兼容性的評