應用均流變壓器及具獨立調控之多組輸出於車用LED頭燈驅動器

本論文係研製一具可調光之車用LED頭燈驅動器，其前級主電路架構係採用一具多組輸出之前向式轉換器，以提供後級具均流變壓器之Twin-Bus轉換器所需之兩組輸入電源。此前級轉換器可藉由個別之回授控制來調控其輸出電壓，不會因各負載於彼此輕重載交錯變動時，造成電壓變動過大的問題。藉由一次側開關之脈波寬度中加入一高頻脈波寬度來調控另一組輸出電壓，藉此以實現獨立調控之目的。除此之外，具均流變壓器之Twin-Bus轉換器不僅能使多串LED串列達到均流目的，同時也能降低開關上之電壓應力。此LED驅動器係採用現場邏輯閘陣列來做為整體系統之控制核心，以產生適當脈波調變訊號，來驅動LED使其電流峰值控制在額定值，並搭配脈波寬度調光控制訊號，來實現LED調光的目的。最後，藉由理論推導、模擬及實作來驗證所提架構之可行性及有效性。

關鍵字

連續導通模式；均流變壓器；多組輸出；前向式轉換器；現場邏輯閘陣列； LED ；脈波寬度調光； Twin-Bus轉換器車用頭燈

並列摘要

In this thesis, a dimmable LED driver used in a vehicle head light is presented, and this driver is constructed by the first-stage circuit built up by one multi-output forward converter to provide two voltages for the second-stage circuit built up by a Twin-Bus converter with current-sharing transformers. The two outputs of the first-stage circuit have individual feedback controllers so as to stabilize individual desired output voltages, which are affected by each other due to variations in load as minimum as possible. Applying a high-frequency pulse width to the pulse width which is used to control one output voltage makes the other output voltage controllable, so as to achieve two outputs possessing individual controllers. At the same time, the Twin-Bus converter with current-sharing transformers can make not only the output current from this converter evenly distributed among LED strings, but also the voltage stress on the switch reduced. The overall system uses the field-programmable gate array (FPGA) as a control kernel, so as to generate not only a suitable PWM control signal to make the peak current in LEDs kept constant at the rated value, but also a PWM dimming signal to achieve LED dimming. Finally, via mathematical deductions, simulated waveforms and experimental results, the feasibility and effectiveness of the proposed topology can be verified.

並列關鍵字

Continuous conduction mode ； current-sharing transformer ； multi-output ； forward converter ； field-programmable gate array ； LED, PWM dimming ； Twin-Bus converter ； vehicle headlight

參考文獻

[37] 蕭乾文，高亮度LED車用頭燈驅動器之研製，碩士論文，國立台北科技大學電機工程系研究所，2013，台北。

[47] 溫兆均，反馳式轉換器之磁放大後級調節器分析與設計，博士論文，國立台灣大學電機工程系研究所，1995，台北。

[1] N. Mohan, T. M. Undeland and W. P. Robbins, Power Electronics: Converters, Applications and Design, 3rd ed., Wiley, 2003.

[2] Heinz van der Broeck, Georg Sauerlander and Matthias Wendt, “Power driver topologies and control schemes for LEDs,” IEEE APEC’13, pp. 330-333, 2013.

[3] Chun-An Cheng, Chien-Hsuan Chang, Fu-Li Yang and Tsung-Yuan Chung, “A novel single-stage high-power-factor LED driver for street-lighting applications,” IEEE PEDS’08, pp. 2657-2663, 2008.

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應用均流變壓器及具獨立調控之多組輸出於車用LED頭燈驅動器

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