功率因数监测与补偿教学系统的设计

The Design of Power Factor Monitoring and Teaching Compensation System

功率因数监测与补偿教学系统以C8051F020高集成智能型单片机为控制核心,实现对电压、电流、频率、有功功率、无功功率、功率因数的检测以及完成对功率因数自动补偿控制。系统采用模块化设计,设计中运用交流采样技术对交流电压、电流信号直接采样以确保精度,用高精度的真有效值转换芯片AD637对取样信号进行转换,采用电平移位采集电流峰值测量瞬态电流,采用在电路中增减并入电容的方法进行功率因数的自动调节,提高功率因数。

The experiment system is designed with high integration and intelligent MCU C8051F020 as control core.The detection of voltage,current,frequency,active power,reactive power and power factor is realized.Also,automatic compensation control of power factor is accomplished.In the design,AC sampling technology is adopted in AC voltage and AC current signal directed sampled process to ensure accuracy;Sampled signal is converted by using conversion chip AD637 with high accuracy real effective value;Instantaneous current is measured with level shift by sampling current peak-value;Power factor is automatic adjusted by increasing or decreasing capacitance in the circuit.According to the above measures,power factor is more improved.As the system adopts modular design,control conversion by keyboard operation and measured values display by LCD,the measuring accuracy is especially high.