本文提出具定功率控制的電路，用來維持自激式電子安定器的輸入功率及燈管功率。因為傳統自激式電子安定器本身具有輸入功率及燈管功率隨輸入電壓變動而改變的缺點，而此缺點將造成燈管的光照度品質差。所以本文提出具定功率控制電路的自激式電子安定器，來解決此自激式電子安定器輸入功率及燈管功率隨輸入電壓變動而改變的缺點。本文並實作一38W的具功率控制之自激式電子安定器，來驗證此自激式電子安定器具有定功率之效果。

　　This paper presents the constant-power control circuit, which maintains the input power and lamp power of the self-oscillating ballast. Abilities of constant input power and lamp power are required for the self-oscillating ballast. The conventional self-oscillating electronic ballast is disadvantageous because the input power and lamp power vary according to the input voltage. This difference in lamp power causes poor quality of illumination for the lamp. In order to solve the problems of the self-oscillating electronic ballast, a constant-power control circuit is proposed to provide constant input power and lamp power. In this paper, a 38W self-oscillating ballast with the constant-control circuit is implemented. The ability to provide constant levels of input power and lamp power is demonstrated in the experimental results to verify the performance of the proposed constant-power control circuit.

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