AC Power measurement ( digital sampling)

Electrical Engineering Asked by d0zero on November 16, 2020

i want to measure AC power and i want to know what is the best and safest way to digital sample AC voltage and AC current?

For AC voltage: We can use

  • voltage divider and feed it to ADC with reference eg -5V to 5V ( non isolated)
  • transformer to transformer from 230VAC to 5VAC and feed it to ADC (isolated)
  • use voltage divider and isolation opamp or ADC ( isolated)
  • are there any other options?

For AC current: We can use

  • shunt resistor with opamp to adc ( non isolated and high dissipation on shunt)
  • shunt resistor with isolation opamp or ADC ( same as above with isolation)
  • current transformer ( can you suggest some ?) ( isolated)
  • hall effect sensor ( can you suggest some?) ( isolated)
  • are there any other options?

Because i need to sample the voltage and current at the same time i need two ADC, but i’m not sure what delay will be introduced for voltage ( if use any option from above) also for current ( if use any option from above) ? And if delay is introduced how can i synchronize the two ADC?

List of priorities:

  1. size
  2. price
  3. low power ( as possible)
  4. complexity

The voltage is 230Vac and max current 16A and if possible current resolution 100mA


Add your own answers!

Related Questions

Bode Fano criterium and low Q-factor

0  Asked on February 25, 2021 by anice41


How to divide 24VAC to 24VDC for use with GPIO

2  Asked on February 24, 2021 by brad-hein


Keep MOSFET open using capacitor

1  Asked on February 24, 2021 by vladimir-g


Enable Timer interrupt after generating N pulse

1  Asked on February 22, 2021 by john-jin


Can’t program ATmega with ICSP on custom pcb

1  Asked on February 21, 2021 by trey-jenkins


ALD1106/1107 transmission gate “off” state behaviour in LTSpice

1  Asked on February 21, 2021 by prasanjit-rath


3mm and 5mm LED

3  Asked on February 20, 2021 by user29463


TVS diodes configuration for AC differential signal

1  Asked on February 18, 2021 by drakejest


Ask a Question

Get help from others!

© 2022 All rights reserved. Sites we Love: PCI Database, MenuIva, UKBizDB, Menu Kuliner, Sharing RPP, SolveDir