基于DSP低Q值感应加热电源的研究

为了增加感应加热电源的炉壁厚度及提高输出功率,本文提出了一种新型低Q值感应加热电源,采用Buck斩波电路来调节电源的输出功率,通过改变Buck电路的占空比D来改变C2两端的电压值,从而调整逆变器的输入电压,使电源的输出功率恒定;控制系统采用TI公司的TMS320F28335作为控制芯片,控制功率开关管的导通与关断,使电源能够恒定功率输出,并且实现自动变频功能,提高感应加热电源的工作稳定性.实验结果表明,当感应线圈直径不变时,炉胎的炉壁越厚,内径越小,感应线圈与被加热金属的互感系数越小,系统的无功能量增加;低Q值感应加热电源可以把其内部更多的无功能量转换成有功能量,并且炉壁越厚,输出功率越大.该研究提高了电源的输出功率,解决了传统感应加热电源无法加厚炉壁的缺点.

Induction Heating Power Supply Device of Low Q Value Based on DSP

This paper presents a new induction heating power supply device of low Q value in order to in- crease the thickness of the wall of the furnace and increase the power. The control circuit uses single-chip TMS320F28335 of TI control. Adjusting the input voltage of the inverter by controling the duty cycle of Buck Converter ensures the stability of output power. Adjusting the frequency of the inverter automatical- ly by controling it＇s own SCR achieves stability. Experimental results show that reactive power can be in- creased by holding diameter of the induction coil, increasing thickness of the furnace wall, reducing the in- side diameter, lessening the mutual coupling factor between the induction coil and the metal and this new induction heating power supply device of low Q value could convert more reactive power into active power to increase the power. The research findings of this paper increase the effective output and solve the prob- lem of the thin wall of the traditional induction heating power supply device.