摘要
为实现对电网电压的同步采样,设计了不使用ADE7758的电能计量功能,只把其作为AD转换芯片的方案。用LTC6903产生时钟作为ADE7758的工作时钟来控制采样速率。由单片机R8C/25调整LTC6903的时钟频率来跟踪电网频率变化从而实现1个电压周期的128点同步采样,实现对电网频率的高精度跟踪,同步精度在0.03 Hz以内,为电网电压的谐波分析奠定基础。
A program without the energy measurement function of ADE7758 only as the AD converter chip is designed for the synchronous sampling of grid voltage.The clock generated by LTC6903 serve as the ADE7758＇s operating clock to control sampling rate.The clock frequency of LTC6903 is adjusted by MCU R8C/25 to track the changes in grid frequency,and thus 128 points synchronous sampling of a voltage cycle is achieved,and the power grid frequency to be tracked with a high degree of accuracy can be achieved,and its synchronization accuracy is less than 0.03 Hz,and the foundation for the harmonic analysis of the grid voltage can be settled.
出处
《北京信息科技大学学报（自然科学版）》
2012年第5期81-85,共5页
Journal of Beijing Information Science and Technology University
关键词
同步采样
电网频率
电网电压
synchronous sampling
grid frequency
grid voltage
