本文提出一種新型的電路架構應用於35W汽車用氙燈，電路以變頻啟動控制方式將燈管由暫態操作至穩態，燈管啟動頻率35kHz，穩態頻率25kHz。輸入電壓為12~15V的汽車電池，利用直流升壓轉換器可將輸入電壓升壓到30V，且藉由控制其工作週期可達到功率控制的目的；後級，利用推挽式串聯諧振並聯負載轉換器產生高頻弦波以供給燈管所需之功率；另外，利用多級升壓點火電路提供燈管發弧所需的高壓(18kV~23kV)。利用本文提出的電路架構，燈管在暫態期間約需十幾瓦的功率即可順利將燈管點亮。由實際量測所得的波形可知，本架構可達到零電壓切換的功能，減低切換損失。最後，利用本文所提出的架構，分別量測與探討燈管操作於高頻時暫態期間與穩態期間之各種電氣特性。

A novel electronic ballast for automotive HID lamp using variable-frequency control method is presented. The switching frequency of the proposed ballast is changed from 35kHz at start-up transition to 25kHz at steady-state operation. A boost converter is used to boost the 12V battery voltage to 30V and also to control the power to the lamp. Then a push-pull series-resonant parallel-load inverter is used to provide the high frequency ac voltage for the lamp. In addition, a cascaded multiplier circuit with spark-gap and transformer is designed to supply 18~23kV igniting voltage. By using the proposed circuit, about 10~15W input power is needed to supply to the HID lamp during start-up transition condition. The experimental results show that the proposed circuit can achieve low switching losses by zero voltage switching. Finally, high frequency electrical characteristics of the HID lamp operated at start-up transition and steady-state are measured and discussed.

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