The hardware circuit diagram of AC voltage measuring module system

Published:2011/5/12 0:35:00 Author:Nicole | Keyword: AC voltage, measuring module, hardware | From:SeekIC

VREF's value is adjusted by potentiometer R92, the voltage is improved to 2V, after the AC input voltage with 2V amplitude is rised, it outputs 0~4V monopolar voltage. In order to ensure thatthe sample voltage can reflect the analog signal adequately, it should has enough sampling numbers in a power frequency cycle, the sampling numbers are decided by sampling theory and the considered harmonic number. A 220V／8V transformer changes 220V network voltage into 8V AC voltage, a 470Ω partial pressure potentiometer is connected to it, then it can be adjusted to AC voltage with 2V amplitude, after improving, the circuit is transfered into a 0～4V monopolar voltage singal.



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