基于单片机的宿舍多功能用电监控系统的设计

Design of MCU-based multi-function monitoring system for electricity utilization in dormitory

高校宿舍限电系统大多采用相位比较的方法来限制大功率电器设备的使用,这种方法仅能限制纯电阻负载,针对这一不足,设计一种通过限制功率的方法来限制大功率电器设备的多功能用电监测系统。该系统通过记录ADE7755专用电能测量芯片输出的脉冲个数实现电能的计量,通过计算两脉冲的时间间隔实现负载的功率,当功率超过某一限值时,实现断电。同时该系统还具有电能计量、无线抄表、电压和温度测量、时钟显示、火灾报警等辅助功能。实际运行表明,该系统功率相对误差小于2%,电能相对误差小于5%,电压测量相对误差小于3%,同时系统运行稳定、可靠,在保障宿舍安全用电方面起到了积极的作用。

The phase comparison method is mostly adopted in college dormitory electricity limit system to limit the use of high-power electrical appliances,which can only limit the pure resistive load. To solve this insufficiency,a multi-function power monitoring system for electricity utilization was designed to restrict the use of high-power electrical appliances by limiting the power. The electric power metering is realized by recording the pulse number output from the dedicated power measurement chip ADE7755. The load power is calculated by the interval between two pulses. When the power exceeds the limiting value,the power is cut off. The system has the auxiliary functions of electric power metering,wireless meter reading,voltage and temperature measurement,clock display and fire warning. The actual running shows that the relative error of the system power is less than2%,the relative error of electric energy is less than 5%,the relative error of voltage measurement is less than 3%. The system is stable and reliable,and can play an active role in safety utilization of electric power for dormitory.