【摘要】：感應(yīng)加熱由于其清潔可靠,廣泛應(yīng)用于工業(yè),民用領(lǐng)域。而在民用方面最為人所知的就是電磁爐。其相比于普通爐具,電磁爐具有加熱速度快,節(jié)能環(huán)保,安全性高等優(yōu)點,深受人們的喜愛。本文以設(shè)計連續(xù)輸出功率范圍為500W-1000W的保溫電磁爐為目標,分析了電磁爐常用逆變拓撲的優(yōu)缺點,并進行比較,根據(jù)設(shè)計要求,得出最適合此功率范圍的保溫電磁爐拓撲為準諧振ZVS單管逆變器。準諧振ZVS單管逆變器通常采用自激振蕩電路進行控制,針對目前常用的低成本單管感應(yīng)加熱電源存在的IGBT非零電壓開通(ZeroVoltageSwitching,ZVS),電容脈沖爬升速率(du/dt)大,IGBT損耗增大等缺陷,論文對該電源的運行機理進行深入剖析,得出該電路不能實現(xiàn)ZVS的本質(zhì)原因。提出通過增加固定延時的辦法來實現(xiàn)該電源的ZVS,并對電路的延時時間范圍進行了理論分析和推導。最后給出了通過增加比較器數(shù)量的方式來實現(xiàn)增加固定延時的合理方案。結(jié)合設(shè)計的目標,搭建了基于準諧振ZVS單管感應(yīng)加熱的實驗平臺。并通過理論分析對系統(tǒng)的主要參數(shù)以及保護電路,控制電路進行了設(shè)計,并對系統(tǒng)進行實驗驗證,實驗結(jié)果表明,該系統(tǒng)頻率與功率對應(yīng)的曲線較硬,功率因數(shù)高,諧波低,且能滿足連續(xù)輸出功率時實現(xiàn)ZVS。
[Abstract]:Induction heating is widely used in industrial and civil fields because of its cleanliness and reliability. What is best known for civilian use is the induction cooker. Compared with the common stove, the induction cooker has the advantages of high heating speed, energy saving and environmental protection, high safety and so on. In this paper, the advantages and disadvantages of the common inverter topology of the electromagnetic furnace are analyzed and compared. According to the design requirements, the advantages and disadvantages of the common inverter topology are analyzed and compared with the design of the thermal insulation induction cooker with continuous output power range of 500W-1000W. The optimal thermal insulation induction furnace topology for this power range is obtained. The quasi-resonant ZVS inverter is obtained. The quasi-resonant ZVS single-transistor inverter is usually controlled by self-excited oscillation circuit. Aiming at the disadvantages of low cost single-transistor induction heating power supply such as IGBT non-zero voltage turn-on (ZeroVoltageSwitching,ZVS), capacitive pulse climbing rate (du/dt) and large loss of IGBT, etc. In this paper, the running mechanism of the power supply is deeply analyzed, and the essential reason why the circuit can not realize ZVS is obtained. The ZVS, of the power supply is realized by increasing the fixed delay time, and the delay time range of the circuit is theoretically analyzed and deduced. Finally, a reasonable scheme to increase the fixed delay by increasing the number of comparators is given. Combined with the design goal, an experimental platform based on quasi-resonant ZVS single tube induction heating was built. The main parameters of the system, the protection circuit and the control circuit are designed by theoretical analysis. The experimental results show that the curve of frequency and power is hard, the power factor is high, and the harmonic is low. ZVS. can be realized when continuous output power is satisfied.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM924.01;TM46

【參考文獻】

相關(guān)期刊論文 前7條

1 李文軍;顧U喓，

本文編號：2222818