Variational Half Bridge Series Resonance Intermediate Frequency Induction Heating Power Supply
With the variational series resonance load circuit, people can design a kind of intermediate frequency induction heating power supply for the Injection molding machine. The article has analysed the basic operation principle of the variational half bridge
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Variational Half Bridge Series Resonance Intermediate Frequency Induction Heating Power Supply Wei-gong Kong, Li-rong Li and Hui-shan Han
Abstract With the variational series resonance load circuit, people can design a kind of intermediate frequency induction heating power supply for the Injection molding machine. The article has analysed the basic operation principle of the variational half bridge series resonance inverter, and introduce the main circuit structure and switch tube driver protection of induction heating power supply, and also raised the engineering design method. The frequency of operation of this electromagnetism induction heating power supply is 20 kHz with the output power of 10 KW, and it can be used in the injection molding machine and to heat the charging barrel of comminutors. The experimental results show that this power can provide good sine-wave current, the performance of which has met the design requirements, and the power supply has been operated in industrial field. Keywords Induction heating
Inverter IGBT1
17.1 Introduction Heating is a non-contact heating method, which makes the metal heat by itself. The heating method has been widely used in the melting, casting, hardening, hot forging and welding industries that need the heat treatment for its advantages of high efficiency of heating surface, fast and good controllability [1]. Intermediate frequency switching power supply is the key equipment of induction heating, and usually its main circuit uses the resonance inverter. W. Kong (&) L. Li H. Han Xingtai Vocational and Technical College, Xingtai 054035 Hebei, China e-mail: [email protected]
W. Du (ed.), Informatics and Management Science III, Lecture Notes in Electrical Engineering 206, DOI: 10.1007/978-1-4471-4790-9_17, Ó Springer-Verlag London 2013
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According to the resonant load, we can divide the main circuit into series resonant inverter and parallel resonant inverter. It not easy for the parallel resonant inverter to start, because it needs to precharge the direct current filter big inductance before it starts and it can only work in the self-excitation state [2]. Once the drive signal frequency is not equal to the inherent resonance frequency load frequency, the machine can not start. While the same thing is easier to series resonant inverter, and it can work in both self-excitation state and other-excitation state, which will make it easy to start. At the same time, the reliability of parallel resonant inverter is not so good that the equivalent impedance and other parameters of load will change during the heating process, and the resonant frequency will also have a corresponding change. Once the inverter control circuit can not follow the tracks of resonant frequency accurately, the inverter may stop vibration and even meets the stoppage of inverter subversion. While the series inverter will not face the problem and it also has better reliability. When the resonant frequency is changing with the heating process, even the control ci
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