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
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