本論文針對筆記型電腦背光源驅動器輕薄短小之要求，提出一新型應用圓型疊層壓電變壓器之白光LED驅動電路。使用50顆白光LED串聯之架構，避免使用額外之負載均流電路並結合壓電變壓器具有高電壓增益之特性針對白光LED之工作條件進行設計。於控制器設計上，提出結合脈波寬度調變與順向式脈波頻率調之控制方式，使其可因應較寬廣之輸入電壓變動範圍且具有良好的調節特性與調光功能。本驅動電路設計工作於零電壓切換，且於直流電源變動範圍14V至22V時，皆具有30%至100%之調光範圍，其滿載功率為3.1W。

　The thesis presents a white light emitting diode driving circuit utilizing round-shaped multi-layer piezoelectric transformer for the backlight module of a notebook whose requirement is thin and light. Fifty LEDs in serial topology are driven by the driving circuit with a PT operated under step-up mode with high voltage gain. Due to a new control method combined with pulse width modulation and forward pulse frequency modulation presented in this research, the driver of LEDs performs good line regulation and dimming function. The proposed driver archives ZVS for low switching loss, and the dimming range results from 30% to 100% at an input voltage of dc 14V~22V .

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