多模式操作的一次側調整單級高功因LED驅動電路之研究

LED照明目前受限於價格太高其滲透率仍低，如何降低成本是目前最重要議題，其次由於能源之星與IEC 1000-3-2 Class C皆對照明設備有功率因數與諧波失真之要求，故具備高功率因數已成為LED照明設備之趨勢，另外節能為溫室效應下之必然要求，如何增進效率亦是LED照明追求的重要目標。為了降低成本，本論文提出一無需光耦合之一次側調整(primary side regulation, PSR)控制方法，除降低反馳式LED驅動電路本身之成本外，所提出之控制電路無需取樣電路、乘法器與除法器，電路簡單易於日後被IC化。其次為提升功率因數，本論文應用定頻式電流鉗位模式控制可確保輸入電壓全範圍功率因數均能大於0.9。所提出電路另一獨特之處在於克服一般PSR電路僅能操作在不連續導通模式(discontinuous conduction mode, DCM)及邊界導通模式(boundary conduction mode, BCM)之限制，使轉換器亦可以在連續導通模式(continuous conduction mode, CCM)操作，使之具有較高之效率及可操作之功率範圍。本論文探討各式25W以內之LED驅動電路，包括無功因調整者與採用單級功率因數調整架構者，據以提出本論文之電路。除分析所提出電路之工作原理及量化設計方法外，亦經由PSIM軟體模擬來驗證所提之方法之可行性。

關鍵字

連續導通模式；一次側調整；定頻式電流鉗位模式控制；率因數校正

並列摘要

LED lighting equipment is still low penetration because of its high cost. How to down the cost is an importment issue. Requests of high power factor and low harmonic contents in the Energy Star and IEC-1000-3-2 Class C certifications have make the built-in power factor correction (PFC) function a trend of the LED lighting equipments. On the other hand, the greenhouse effect drives the energy saving demand. Higher efficiency is more and more emphasized. Accordingly, this thesis proposes a primary side regulation (PSR) control circuit to omit the photocoupler to save the circuit cost of the flyback LED driver. The control circuit itself is also low cost due to save of sampling circuit, multiplyer and divider circuits. It is easily been integrated as an IC in future. The control circuit also possesses the clamped-current-mode control to achieve PF>0.9 at all universal voltages. Another important feature of the proposed PSR control circuit is that it can operate at CCM, BCM and DCM. Overcome the traditional PSR limitation that only can operate at DCM and BCM. This feature has the advantages of increase the efficiency and available power. This thesis explores the control metohds of LED drivers including the non-PF and sigle-stage PFC topologies below 25W, and based on these methods to present the proposed method. Analysis and circuit design are performed, all of the proposed methods are confirmed with some simulated results.

並列關鍵字

CCM ； clamped-current-mode control ； PFC ； BCM ； DCM ； primary side regulation

參考文獻

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[16] J. T. Hwang, M. S. Jung, D. H. Kim; J. H. Lee, M. H. Jung and J. H. Shin, “Off-the-line primary side regulation LED lamp driver with single-stage PFC and TRIAC dimming using LED forward voltage and duty variation tracking control,” IEEE Journal of Solid-State Circuits, Vol. 47, No. 12, pp. 3081-3094, 2012.

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多模式操作的一次側調整單級高功因LED驅動電路之研究

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