单管感应加热电源的设计与改进
发布时间：2018-09-04 17:12
【摘要】：感应加热由于其清洁可靠,广泛应用于工业,民用领域。而在民用方面最为人所知的就是电磁炉。其相比于普通炉具,电磁炉具有加热速度快,节能环保,安全性高等优点,深受人们的喜爱。本文以设计连续输出功率范围为500W-1000W的保温电磁炉为目标,分析了电磁炉常用逆变拓扑的优缺点,并进行比较,根据设计要求,得出最适合此功率范围的保温电磁炉拓扑为准谐振ZVS单管逆变器。准谐振ZVS单管逆变器通常采用自激振荡电路进行控制,针对目前常用的低成本单管感应加热电源存在的IGBT非零电压开通(ZeroVoltageSwitching,ZVS),电容脉冲爬升速率(du/dt)大,IGBT损耗增大等缺陷,论文对该电源的运行机理进行深入剖析,得出该电路不能实现ZVS的本质原因。提出通过增加固定延时的办法来实现该电源的ZVS,并对电路的延时时间范围进行了理论分析和推导。最后给出了通过增加比较器数量的方式来实现增加固定延时的合理方案。结合设计的目标,搭建了基于准谐振ZVS单管感应加热的实验平台。并通过理论分析对系统的主要参数以及保护电路,控制电路进行了设计,并对系统进行实验验证,实验结果表明,该系统频率与功率对应的曲线较硬,功率因数高,谐波低,且能满足连续输出功率时实现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.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM924.01;TM46
[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.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM924.01;TM46
【参考文献】
相关期刊论文 前7条
1 李文军;顾U喓，
本文编号：2222818
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