感应加热电源中的频率跟踪技术

分别从锁相环技术和电流过零点同步技术两方面展开了论述,重点阐述了锁相环技术的几种方法.随着数字电子技术的发展,锁相环技术也由传统的CD4046模拟锁相环发展为通过单片机、DSP、FPGA/CPLD实现的数字锁相环'克服了模拟锁相环线路复杂、元件易老化、零点漂移等缺点,从而使频率跟踪技术精度提高、性能更加可靠、稳定性好、抗干扰能力增强.分析了频率跟踪技术的发展趋势.

Frequency tracking technology on induction heating power supply

The paper mainly discusses the frequency tracking technology for induction heating power supply.Then introduce phase locked loop(PLL)and current passing zero technology separately,and stress several ways about PLL.With the development of digital electronic circuit,PLL forms digital PLL based on singlechip,DSP,FPGA or CPLD via simulative PLL based on CD4046.Therefore overcome the disadvantages such as circuit complexity,component aging and zero excursion,and bring into play the advantages such as high precision,reliable capability,better stability and stronger anti-jamming ability.Eventually,the development of the frequency tracking technology is presented.