單級高功因全橋諧振式LED驅動電路研製

Design of a Single-Stage High-Power-Factor LED Driver with Full-Bridge Resonant Converter

黃登群(Deng-Chiun Huang)

指導教授 ： 張永農

國立虎尾科技大學/電機資訊學院/電機工程研究所/碩士(2014年)

摘要

本論文提出一新型單級高功因全橋諧振式 LED 驅動電路。輸入端運用昇壓式功因
修正技術，並利用兩組儲能電感進行交錯儲放能操作，以達到主動式功因修正之目的。本文所提出之LED 驅動電路利用簡易的觸發機制，觸發訊號的取得容易。交錯式技術可降低輸入電源側之高頻漣波，有助於減少電力線的電磁干擾，且使用雙電感分攤輸入電流，更適合應用於高功率之場合。本文驅動電路之輸出端採用全橋LLC 諧振技術，諧振電路設計為電感性，使功率開關具有零電壓切換之效果，以降低功率開關高頻切換損失，提升電路效率。此外，本文透過調變開關操作頻率之方式，改變諧振轉換器之電壓增益值，以調變電路輸出功率，達到調光之目的。本論文先進行電路分析與數學推導，並利用電腦輔助軟體模擬電路架構，最後設計一200 瓦之LED 街燈驅動電路驗證本文之推論與可行性。經實驗結果本文所提出之驅動電路轉換效率高達95%，功率因數修正高於0.98 以上之電路性能。

關鍵字

發光二極體 ； 交錯式技術 ； LLC諧振式轉換器 ； 功因修正電路 ； 零電壓切換

並列摘要

This paper proposes a Single-Stage Power Factor Correction of Full Bridge Resonant LED Driving Circuit. Two inductor driven by interleaved technology, which high power factor can be achieved. This paper proposes simple control for LED driving circuit. Two inductors are able to operate, and proportional with the input voltage. Interleaved technology
is used to reduce high-frequency noise on power line, and can effectively decrease electromagnetic interference as well. On the other hand, using two inductors, the input current can be equally shared, which is more suitable in high power applications. This thesis proposes
full bridge LLC resonant converter with resonant voltage leading of the resonant current. Power switches achieve zero voltage switching. With ZVS function, switching losses under
high frequency can be reduced, and circuit efficiency can be promoted accordingly. Besides, switching frequency can be adjusted to change voltage gain of resonant converter. By doing so output power is adjustable and LEDs will be dimmable. In this thesis, circuit analysis and mathematical derivation will be engaged in advance. Circuit simulation is performed in succession circuit simulation. Finally, the prototype driving circuit design for a 200-W street LED driving circuit, and which was built and tested to verify the analytical predictions. The circuit efficiency is 95%, and the power factor is 0.98.

並列關鍵字

Light Emitting Diode ； Interleaved ； LLC resonant converter ； Power factor correction circuit ； Zero voltage switching

參考文獻

[25]柯柏任，2009，“交錯式LLC串聯諧振轉換器的研製”，國立台北科技大學電機工程系碩士班碩士學位論文。

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