全橋相移式柔性切換負載並聯共振電流型感應加熱器之設計與研製

Design and Implementation of Full Bridge Phase Shift Soft Switching Current Fed Load Parallel Resonant Induction Heating System

劉明峰(Ming-Feng Liu)

指導教授 ： 何金滿

中原大學/工學院/電機工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400161

摘要

摘 要

本文之研究在於建構一電流饋入式電源轉換裝置，應用於負載並聯諧振感應加熱系統之上，藉由相移調整技術、重疊時間控制方式以及功率變壓器雜散元件之運用，賦予功率開關具備柔性切換之性能，進而使開關上的切換能量獲得適當的轉換，以達降低電磁干擾、減少損失、提高加熱效率之目的；此外，相移技術之應用，亦可取代傳統電流饋入式換流器架構中之四顆串聯二極體需求，如此不但可簡化結構，亦可減少損失與降低成本。由於加熱負載之電氣特性伴隨加熱溫度的變化而改變，有鑑於此，本研究採用相鎖迴路控制技術，致使系統工作頻率於一定範圍內追隨諧振頻率，確保加熱系統於運作期間之效率為最佳狀態。

最後，針對本研究之感應加熱系統，其換流器控制信號、操作特性與整體效率進行量測與說明；此外，亦針對加熱溫度變化情況下，加熱負載電氣特性改變對於加熱效益做一探討。

關鍵字

負載並聯共振 ； 柔性切換 ； 感應加熱 ； 電流饋入式換流器

並列摘要

Abstract

The main purpose of this study is to establish a current-fed switching power supply for load parallel resonant induction heating system. By utilizing phase shift regulation, overlap time control, and the stray components of the power transformer, the switches are enable to have the function of soft switching and the energy suitable transforming. The purposes are to reduce electromagnetic interference and losses and to improve efficiency. Furthermore, four series connection diodes of traditional current-fed inverter can be omitted by application of phase shift regulation. Therefore, a design with simplified structure, reduced losses and cost can be achieve.

The electric characteristics of heating load change with variations of temperature. For this reason, this paper has adopted technology of phase locked loop, causing switching frequency to follow resonant frequency, to ensure heating system is in the best efficiency.

Finally, the controlled signals of inverter, operation characteristics and efficiency of the system are measured and discussed.

並列關鍵字

current fed inverter ； induction heating ； soft switching ； load parallel resonant

參考文獻

[23] 許國展， “應用於感應加熱的負載串聯共振電壓型反流器設計與研製” ， 私立中原大學碩士論文，民國九十一年。

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