Research And Design Of Electric Iron Based On High-frequency Induction Heating

With the swift development of our society and electronic technology, the new technologies and products come out unceasingly. Electric soldering iron is necessary when assembling electronic products and repairing the electric appliance.The welding technique of electronic products is in high demand, so the Information Technology and Era of electronic products have very high demands for the performance requirements of electric soldering iron.As is known to us all, there are lots of shortcomings in traditional electric soldering iron. It needs time to preheat the iron,and its heating method is indirect heat conduction, which leads to the loss of heat, low efficiency and energy waste. If the electric soldering iron is always in a state of heat,what is called burned in the empty state, it will waste the energy seriously and affect the service life of the electric soldering iron.What's more, the traditional electric soldering iron has low power and rate and slow heating speed, which leads to the inaccurate control. The above reasons will do damage to the components and parts during the welding process. There is no earth-leakage protection and the heated end is the fine copper, heating equipment is the electric resistance wire, which easily contributes to the electric leakage accidents.Aimed at the shortcomings of the traditional electric soldering iron, this research adopted the model of induction heating to the heated end. The constant temperature control system and the rapid, effective and sage design make up the traditional shortcomings.Adopting the Infineon XMC1300 as the main control chip, gathering warmth through the K-shield thermocouple and transforming the A/D XMC1300 into PID method to control the steady temperature. Improving the heating method of the low frequency resistance wire in traditional electric soldering iron and adopting the heating method of high frequency induction eddy current will improve the efficiency and heating rate. And it will save the energy without the preheating time. In order to satisfy the requirement that output voltage, load regulation should meet the needs of the electrical power generating system and the dynamic response should be quick, this research designed the two-transistor forward electric power generating system which concern the UC3842 as a core concept and make use of the PC817 and TL431 to forma feedback network. The contravariant part adopt the inversion of single tube to make the control circuits easily. The simulation and the experimental results show that the output voltage is steady, low in-band ripple, high in load regulation, quick in dynamic response.The overall framework of this research is as follows :Firstly,it introduces the curr ent situation and the future trend of the electric soldering iron and the induction heatin g mode. Secondly, it presents special field technology theory and confirms the topolog y structure of the main circuit. Then it designs the main frame and the main circuit,inc luding the AC/DC convertor and the shunt-resonant circuit.And it recommends the ac hievements of the temperature control system including the hardware and software.Ev entually, it verifies the feasibility and applicability through the experimental wavefor ms of the on-line debugging and the comparison with the data of traditional electric so ldering iron.