摘要
水垢现象普遍存在,而且危害巨大.鉴于此,设计一幅度调制电磁场发生装置.激励信号经由幅值调制后再加以功率放大而得到.将两路正弦信号通过MC1496乘法器,使载波信号的幅度随调制信号的规律变化.再将已调制后的信号通过D类功放芯片TDA8920BTH进行功率放大.最后得到的激励信号加载在磁芯线圈上得到一强度调制的交变电磁场.
Scaling is commonly and harm ful.So,an amplitude-modulating electromagnetic field generator was designed.The drive signal was obtained by amplitude modulation and power amplification.It made two sine signals through the MC1496 multiplier and the carrier's amplitude changes with the modulator's rule.Then,used D class amplifier TDA8920BTH to enlarge the power of modulated signal.At last,loading the drive signal on a ferrite of magnetic coil to gain an electromagnetic field whose strength is modulated.
出处
《中国计量学院学报》
2011年第3期263-267,共5页
Journal of China Jiliang University
关键词
水垢
幅度调制
乘法器
D类功放
电磁场
scaling
amplitude modulation
multiplier
D class amplifier
electromagnetic field
