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How to convert 3.6v to Transducer excitation 21 volts

 
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suncq



Joined: 21 Jul 2006
Posts: 21

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How to convert 3.6v to Transducer excitation 21 volts
PostPosted: Thu Nov 01, 2007 7:31 pm     Reply with quote
I have a project about battery powered telemetry unit now. Battery is 3.6 voltage. I need to convert this voltage to Transducer excitation 21 volts (@ 200mA).Because It will be into ADC channel. the ripple voltage need be as little as possible.
any tip? thanks in advance!
suncq@126.com
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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Re: How to convert 3.6v to Transducer excitation 21 volts
PostPosted: Thu Nov 01, 2007 8:48 pm     Reply with quote
suncq wrote:
I have a project about battery powered telemetry unit now. Battery is 3.6 voltage. I need to convert this voltage to Transducer excitation 21 volts (@ 200mA).Because It will be into ADC channel. the ripple voltage need be as little as possible.
any tip? thanks in advance!
suncq@126.com


Assuming you find a 100% efficient converter (no such thing exists) the 3.6 volt rail would need to deliver 21/3.6 * 0.2 A to the converter. Assuming 70% efficiency (low because the source voltage is so low) then you need to deliver 21/3.6 * 0.2A / 0.7 = 1.6A

If your 3.6 volt rail is not capable of doing this then it is back to the drawing board.
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suncq



Joined: 21 Jul 2006
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PostPosted: Thu Nov 01, 2007 9:10 pm     Reply with quote
thanks for reply!
I need to provide the Transducer excitation just 2 seconds at 21 volts. I use a 3.6v(14.5AH) battery.
you can see somebody have done this. but I don't know how they do?

http://www.in4ma.co.uk/downloads/in4mametron.pdf
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