本文採用500W直流短弧氙燈作為負載光源,選用系統單晶片PSoC控制短弧氙燈的啟動順序,並以數位調頻調光方式,研製一具可調光的高效率短弧氙燈電子式安定器。短弧氙燈啟動時,需要將近20kV以上的脈衝高壓,啟動後則要有一穩定的電壓使燈管穩定的發光。因此,本文之短弧氙燈電子安定器主要有高壓點火電路與直流電源供應電路架構,高壓點火電路採用兩級式升壓方式,降低升壓變壓器之體積;直流電源供應電路是以LLC諧振式電能轉換器結合整流濾波電路設計,提供可調整的穩定低電壓大電流的氙燈電源,並設計零電壓開關切換,減少開關上的損失,效率高達93%以上。本研究中實作一500W短弧氙燈電子式安定器作為測試,並使用軟體Is Spice作電路模擬,透過此電路的模擬及實作結果來驗證理論之可行性。
In this thesis, a high-efficiency electronic ballast is developed for short-arc xenon lamp and the programmable system on chip (PSoC) is used to control the startup sequence of 500W short-arc Xenon lamp. To start a short-arc Xenon lamp, a pulse voltage above 20kV is required, and the dc-voltage must be stably-maintained to keep the lamp lightening steadily after startup. Therefore, the electronic ballast of a short-arc Xenon lamp composed of a high-voltage igniting circuit and a dc power supply for energizing the lamp. The high-voltage igniting circuit used a two-stage voltage booster that effectively reduces the size of the transformer, dc power supply circuit is a LLC resonant power converter with rectifier filter circuit. The power supply provides an adjustable and stable dc voltage that comes with low voltage and high current for Xenon lamp. By using ZVS operating to reduce the losses of switches, the efficiency can reach up to 93%. In this thesis, a 500W electronic ballast of short-arc Xenon lamp was implemented and tested. The software Is Spice was used for circuit simulation. The results of simulation and experiment are shown to verify the feasibility of the proposed scheme.