本論文針對LED 應用提出一新型諧振被動開關模組(Resonant
Passive Switch Module, RPSM)電路，利用諧振電路中的諧振電容與電
感協助電路動作，可在不需要外加主動開關的情況下，透過電路的諧
振來作動二極體之開與關以改變電路結構，進而實現工作模式的切
換，達到低輸出漣波、高效率以及延長電路使用壽命的效益。
本論文首先解析RPSM 電路的動作原理，透過模型推導以及數
學分析說明其工作模式、操作原理以及電路特性，並提供電路參數設
計參考依據。接著將RPSM 電路應用於被動式功率因數校正(Power
Factor Correction, PFC)設計，利用RPSM 的動作改變輸入電流起始與
結束之波形，進而降低其高次諧波，以提升電路之功率因數，並改善
輸出電流之二倍線頻漣波。此外，本論文亦將RPSM 電路應用於降升
壓電路，在不增加主動開關、不影響電路效率的前提下，使降升壓電
路在操作於不連續導通模式時其輸出電流仍可保持連續，藉以降低輸
出電流漣波。最後，本文以實際建構完成的雛型電路驗證所提電路的
功能與改善效果。實測結果證明，RPSM 電路利用電容與電感的諧振，
使二極體能進行開、關的動作進而達到切換電路結構的作用，可以增
加額外的工作模式，提升電路性能，並可簡化電路的控制架構與成本。

A novel circuit called resonant passive switch module (RPSM) is
proposed, the presented circuit is then integrated into LED drivers to
enhance their performance. No controlled active switch, electrolytic
capacitors, and auxiliary power supply are required in the proposed LED
driver. The advantages of the proposed driver include long lifetime, high
efficiency and recyclability.
The operation principles of RPSM circuit are first analyzed.
Theoretical analysis of the proposed LED driver is made, and some design
guidelines are provided. The RPSM circuit is applied to the passive power
factor correction (PFC) circuit, and the waveform of the input current is
changed by its operation so that the higher order harmonics can be reduced.
Thus, both the power factor and double line frequency ripple of the output
current can be improved. In addition, the RPSM circuit is also applied to
the buck-boost circuit. No additional active switch is needed, and the
efficiency is not affected. In order to lower the output current ripple, the
buck-boost circuit is operated in discontinuous mode. A prototype system
of 50W rating is also constructed, and experimental results confirm the
validity of the proposed LED driver. It can be seen that the resonance of
the RPSM circuit is realized by the capacitor and inductor, and the diode
can be operated properly; therefore, the structure can be changed. The
performance of the circuit can be improved by additional operation modes,
and the control is able to be simplified.

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