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Author Topic: Isolated mains voltage measurement  (Read 5572 times)
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max
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« on: September 10, 2011, 04:30:15 04:30 »

Hi friends,

How to measure isolated mains voltage without using isolating transformer?

regards
« Last Edit: September 13, 2011, 11:08:51 11:08 by max » Logged

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oldvan
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« Reply #1 on: September 10, 2011, 07:19:19 07:19 »

Opto-isolator.
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chandra2sekhar2000
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« Reply #2 on: September 10, 2011, 01:21:23 13:21 »

Hello,
go though with the idea of the clamp meter.if u want to implement a circuit for that use,some windings like a coil,and use adc, microcontroller.
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microkid
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« Reply #3 on: September 10, 2011, 01:27:25 13:27 »

There are Analog opto isolators (single chip) available.

Another way is to convert the signal to digital and use regular opto isolators

MicroKid
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max
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« Reply #4 on: September 10, 2011, 05:37:20 17:37 »

microkid,  analog opto isolators are expensive, I need low cost solution.
any low cost example for the second option.

max
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microkid
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« Reply #5 on: September 11, 2011, 03:15:48 03:15 »

Any simple Voltage to frequency converter will do the job. (For example a 555 timer can be used as voltage to freq. converter)
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TomJackson69
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« Reply #6 on: September 12, 2011, 12:46:55 00:46 »

@ max

Your question maybe best answer by this question on the edaboard.com:

measure mains voltage isolated and
Re: What is the best way to measure main voltage with isolat

And here is link:
http://www.edaboard.com/thread158728.html?vm=r

Your question seems very simple but rather complex. It all depend on how you want to used for and your application.

Regards,

Tom
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