Design of a High-precision Unipolar AC Effective Value Measurement Circuit
The precise measurement of AC power is an essential basic requirement for many terminal devices in the electricity industry.In order to achieve this goal,a high-precision unipolar AC current and voltage measurement circuit is designed using a microcontroller,current transformer,voltage transformer,and unipolar analog-to-digital converter.Based on the definition of the effective value of alternating current,the algorithm correction is implemented in combina-tion with a microcontroller to improve measurement accuracy.The results of the comparative test using a high-precision current and voltage measuring instrument show that the error rate of the measurement circuit is successfully controlled within a thousand levels.This measurement circuit can be applied to current and voltage detection of charging stations,inverters,and other equipment.
high precisionalternating currentmeasurement circuitcurrent and voltage acquisitionunipolar ADC
万方数据
维普
