使用MCU内置序列发生器控制的交流信号采样

针对一款隔离开关控制器交流信号采样的需求,在分析使用MCU内置的采样序列控制器实现多通道交流信号同时采样可行性的基础上,提出了完整的软同步交流信号采样技术的解决方案,设计了交流信号输入调理电路和相应的信号采集软件,使用LM3S9D92内置的ADC系统实现了三相四线交流线路PQIU电气参数的采样,有效提升了控制器产品的性价比。测试结果表明,所设计的交流信号采样部分的精度满足技术规范书的要求。

AC Signal Sampling Methods Controlled by Sample Sequencer in MCU

Aiming at the requirement of AC signal sampling for a disconnect switch controller, a complete solution of software synchronous AC signal sampling was proposed, and the conditioning circuit and the signal acquisition software module of AC signal were designed on the basis of analyzing the feasibility of using sample sequencer to realize simultaneous sampling of AC signals. The sampling task of PQIU electrical parameters of three-phase four-wire AC lines was realized by the built-in ADC system of LM3S9D92, and the performance-price ratio of controller products is improved effectively. The test results show that the precision of AC signal sampling part meets the requirement of technical specification.