Measuring AC Voltage from 60V-300V with Microcontroller

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SUMMARY

This discussion focuses on measuring AC voltage ranging from 60V to 300V using a microcontroller. The user seeks alternatives to using a 220V transformer for voltage step-down, as well as solutions to mitigate power loss associated with resistor-based potential dividers. The application involves an autotransformer and aims to implement an automatic electronic tap changer to regulate voltage output. The frequency of the AC voltage is fixed at 50Hz.

PREREQUISITES
  • Understanding of AC voltage measurement techniques
  • Familiarity with microcontroller programming
  • Knowledge of transformer operation and characteristics
  • Experience with voltage divider circuits and their limitations
NEXT STEPS
  • Research methods for using capacitive voltage dividers for high voltage measurement
  • Explore isolation techniques for safely measuring high AC voltages
  • Learn about using opto-isolators for interfacing high voltage with microcontrollers
  • Investigate the design and implementation of automatic electronic tap changers
USEFUL FOR

Electrical engineers, microcontroller developers, and anyone involved in high voltage measurement and regulation systems will benefit from this discussion.

asad1111
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I want to measure ac voltage raging from 60v to 300v using microcontroller i have figured everything else out except how can i use 220v transformer(to step down the voltage to measure) when input is 300v one solution is to use simple resistors based potential divider to attenuate 300v to 220v but there is too much power loss in resistors and i don't want to build a transformer for 300v any other solutions?
 
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asad1111 said:
I want to measure ac voltage raging from 60v to 300v using microcontroller i have figured everything else out except how can i use 220v transformer(to step down the voltage to measure) when input is 300v one solution is to use simple resistors based potential divider to attenuate 300v to 220v but there is too much power loss in resistors and i don't want to build a transformer for 300v any other solutions?

What is the source of this voltage? What frequency range is involved?
 
Frequency is fixed 50hz
 
What is the source of the voltage, and why do you want to measure its amplitude?
 
source of voltage is autotransformer and i want to implement an automatic electronic tap changer therefore i need to measure its output voltage(which can go to 300v) to automatically change the taps of transformer to regulate the voltage
 

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