設計與研製零電壓切換導通之交錯式PWM轉換器

Design and Implementation of Interleaved PWM Converters Featuring Zero-Voltage Switching On

黃煒迪(Wei-Di Huang)

指導教授 ： 鄭宏良

義守大學/電機資訊學院/電機工程學系/碩士(2018年)

摘要

本文提出兩種轉換器電路架構，分別為交錯式升壓型轉換器與交錯式降升壓轉換器。相較於其它交錯式轉換器，本文所提電路使用一個鐵心和兩組繞線所構成的耦合電感，利用耦合電感磁通連續特性，轉換一次側與二次側之間電流。交錯式轉換器使用兩個主動開關，藉由互感電流將主動開關的寄生電容釋能並且隨後流經其本質二極體，達到主動開關操作於零電壓切換導通(ZVS)之功能，促使電路效率提升。
本文詳細分析電路工作模式分析，並設計與研製200 W交錯式升壓型轉換器與200 W交錯式降升壓轉換器驅動LED模組。由實驗結果得知，所提電路確實可行。

關鍵字

升壓轉換器 ； 降升壓轉換器 ； 交錯式轉換器 ； 零電壓切換導通 ； 發光二極體

並列摘要

This thesis presents two novel converter topologies: an interleaved boost converter and an interleaved buck-boost converter. As compared with other parallel-connected interleaved converter where two separate inductors are used, the proposed one uses a coupled inductor which is composed of a magnetic core with two windings. Both the proposed interleaved converters do not need to use any auxiliary switches, active-clamped circuits or snubber circuits. Owing to the principle of magnetic flux balance, the magnetic-excited current can be diverted between two windings of the coupled inductor. This current is used to discharge the stored electric charges in the parasitic capacitors of the active switches. By this way, the active switches can be turned on at zero voltage. It helps to reduce the switching losses and hence, achieve high circuit efficiency. Detail circuit analyses on different operation modes are performed. The circuit parameters for a 200-W prototype interleaved boost converter and a 200-W interleaved buck-boost converter are designed, respectively. Finally, both prototype circuits were built and tested to verify the feasibility of the proposed interleaved converters. Based on the experimental results, satisfactory performance is achieved.

並列關鍵字

Boost converter ； Buck-Boost converter ； interleaved converter ； Zero-Voltage Switching on ； light-emitting diode

參考文獻

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