AMC3330: How to measure the phase voltage of a three-phase AC

norinobu.kota

Part Number: AMC3330

Tool/software:

I would like to measure the voltage of each phase of a three-phase AC with a maximum input voltage of 264VAC. Is it possible to detect the voltage of each phase (R, S, T) using the following circuit configuration using the AMC3330?

2 months ago

0 Saleh Ahmad 2 months ago

TI__Expert 6240 points

Hi Norinobu,

Can you provide some details on you application?

Yes, this configuration can be used to measure the 3 phases. You can also take a look at this app note: https://www.ti.com/lit/an/sbaa553/sbaa553.pdf

Thanks.

0 norinobu.kota 2 months ago in reply to Saleh Ahmad

Prodigy 20 points

This is the input stage of a three-phase totem-pole PFC. The control of this PFC requires that the voltage of each phase on the input side be detected. (The control applies feedback to the input voltage.)
The app note you provided describes how to measure line voltages, so am I correct in understanding that the configuration shown in the diagram is sufficient for measuring phase voltages?

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AMC3330: How to measure the phase voltage of a three-phase AC