摘要
介绍了脉冲密度调功(Pulse Density Modulation,简称PDM)的原理,由于PDM在品质因数较小时,负载电流波动很大,因此采用均匀PDM方法进行改进,推导出品质因数与谐振周期数的关系。通过给定品质因数,可以很方便地计算出一个工作周期内的最小脉冲密度,从而避免过小的电流流过负载,使负载电流连续,保证对负载谐振频率进行可靠跟踪。经过仿真和试验验证了该分析的正确性。
This paper introduces the principle of pulse-density-modulation （PDM）,the load current fluctuation is very big when the quality factor is small in PDM,the symmetrical PDM can improve the situation.The relationship of quality factor and the number of resonant cycle for the symmetrical PDM is deduced.Through assigning quality factor,the smallest pulse density of a working cycle can be calculated easily.The over-small current flowing through the load can be avoided,and the load current is made continually to ensure to track load resonant frequency reliably.The correctness of the analysis is verified through simulation and test.
出处
《电力电子技术》
CSCD
北大核心
2010年第2期77-79,共3页
Power Electronics
关键词
感应加热
电源
脉冲密度调功
品质因数
induction heating
power supply
pulse-density-modulation
quality factor
