need some information about voltage transducers.

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i am planning to dynamically compare two dc lines of 24 volts each. i am planning to use a micro controller for that. as the electrical rating are high in dc lines, i planned to hook them up with a voltage transducer and the corresponding outputs to the analog comparator of the controller. please suggest me which voltage transducer to be used??

Last Edited: Tue. Jan 11, 2011 - 04:52 AM
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Quote:
voltage transducer
What do you mean by that? Something like a non existing DC transformer?? :roll:

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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John ,

Its known as resistive voltage divider ( DC transformer) sadly comes in only one flavour... step down...auto transformer.

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its a transducer that takes voltage as input and correspondingly gives the output in smaller levels of voltage.
i have to compare the voltage levels of 2 solar panels that give 24 volt output. which one has a higher voltage is given as the input to charge a battery. i have to display which panel is currently used on a lcd display.
so, i planned to use a voltage transducer and connect it to a comparator and then proceed with a microcontroller .
if u have any other idea to compare the voltages of 2 solar panels, please let me know

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A transducer converts a form of energy to another form (usually voltage). e.g. A Current Transducer would read a current, and output a range of voltage that's related to the current. A voltage transducer is used when the voltage is too high or too low to be detected. A voltage transducer essentially transforms the voltage signal to something readable (e.g. Transforming 0~1000V to 0~5V)

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Cross posting. Ignorance level hasn't changed since.

Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.

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mBEDDER, i ask you to keep quite and let others clear my doubts.. please.. delete your previous post

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Mbedder has a point. People waste time responding to a thread and then waste more time responding to the same question elsewhere.

So I have locked the other thread for a while as this forum is more apropriate for your question.

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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ok sir. but this thread can be closed. i got the solution myself. a '' hall effect voltage transducer '' can be used. any more ideas are invited cordially..

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It seems a complicated setup for comparing 2 x 24V dc signals. 4 resitors would be all that is required as ignoramus describes it above.

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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He hasn't learnt the word "resistor" yet :D

Warning: Grumpy Old Chuff. Reading this post may severely damage your mental health.

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@ john , you mean to say that a voltage divider can be used to do that? well, i have to display some info on an lcd for which i have to use a microcontroller. how am i going to get the current to micro ampere ratings using a voltage divider??

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I'm sure it's me that doesn't understand your requirements still. :roll:

This pestilent fellow :) posted something similar here https://www.avrfreaks.net/index.p...

Just don't use R1. +5V (VREF) would become your 24V input and you connect the ADC to the centre of the 2 resistors. You will have to work out the resistors value of course, but that's just ohm's law. :) Make sure that with the maximum voltage out of the solar panels (most likely higher than 24V at full sun) the centre tap doesn't go above 5V.

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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@ john. i am not only bothered about voltage but also about current. i want current to be so low, in the range of micro amperes.
can i get that using a voltage divider circuit?? i.e the one mentioned by ''Mbedded'' ?

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Try this. Your homework is to calculate the resistor values and study the use of the analog comparator pins "AIN0" and "AIN1".

The "best" solar panel will "auto-magically" charge the battery because of the diode mixer.

Attachment(s): 

Ross McKenzie ValuSoft Melbourne Australia