一种改进型PDM调功控制方式

An Improved PDM Power Control Method

提出了一种改进型PDM(Pu lse D ensityM odu lated)调功控制方式,它能有效解决传统PDM调功控制方式所存在的电流波动大、呈有级调功、开关损耗较大等缺点.基于改进型PDM调功控制方式的逆变器工作于准谐振状态,可以自动跟踪负载频率变化,提高功率因数.利用DSP的快速处理能力对此控制方式进行数字化实现,能较好地增强了系统的抗干扰性和稳定性.

This paper describes a kind of improved pulse density modulated power control method. It solves effectively the shortcomings existing in the normal PDM power control method, e. g. the unstable current, the not smooth power control,the working state of the inverters in the hard switch,etc. With the new power control method, the inverter works at resonance, it can follow the change of the load frequency, and the power factor is higher. Using DSP makes the induction heating power supplying digital control come true. DSP has the ability to process the digital fast as well as enhances the stability of the power system.