一种单相交流电能计量及取电管理系统设计

Design of Single-phase AC Power Metering and Power Management System

电能的精确计量与管理成为了众多用电行业终端设备的基本需求,本文基于合力为科技有限公司高性价比电能计量芯片HLW8112和STM8S208MB单片机制作了一款体积小巧的电能计量与取电管理系统,通过液晶菜单和键盘交互,系统可对单相交流电的有功功率、视在功率、功率因素、电压和电流有效值、相位角、过零点和电压频率等参数进行测量。系统支持漏电检测,在非隔离式采样电路结构下的未校正有功功率测量误差优于1%,计量核心自身功耗小于15 mA,可将计量核心当做积木单元应用于智能家电、充电桩、PDU或交通设备等场景。

The accurate measurement and management of electric energy has become the basic requirements of many end devices in the power industry.In this paper,based on HLW8112 and STM8S208MB single chip microcomputer,a small-sized electric energy metering and power taking management system is developed.Through the interaction of LCD menu and keyboard,the system can measure the active power,apparent power,power factor,effective value of voltage and current,phase angle,zero crossing point,voltage frequency and other parameters of single-phase alternating current.The system supports leakage detection,under the structure of non isolated sampling circuit,the measurement error of uncorrected active power is better than 1%,and the power consumption of the measurement core itself is less than 15 mA.The measurement core can be used as a building block.The unit is applied to intelligent home appliances,charging piles,PDUs or traffic equipment and other scenes.