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Author Topic: [REQ] proportional valve controller circuit  (Read 1633 times)
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Mr. Spock
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« on: September 04, 2012, 08:07:58 20:07 »

Hi all

Need to control a valve using 4-20mA. So a proportional driver is needed.

Regards
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RaynW
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« Reply #1 on: September 04, 2012, 08:57:38 20:57 »

I´m not sure if this is exactly what you´re looking for, but the best would be trying some integrated solution as:
http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=analog&familyId=508&uiTemplateId=NODE_STRY_PGE_T
or
http://www.analog.com/en/specialty-amplifiers/instrumentation-amplifiers/ad5750/products/product.html.

If you can´t get one of those you may try a voltage to current (transconductance) opamp circuit. But probably you will need some low tolerance resistors.
For example this circuit may help:
http://www.allaboutcircuits.com/vol_3/chpt_8/7.html
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joator
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« Reply #2 on: September 04, 2012, 10:29:46 22:29 »

Hi

I really dont know if this is right for you

Check out the mikroElektronika (http://www.mikroe.com/click/#) and there new 4-20 mA Current loop transmitter full schematic and PIC source as available.
It may give you some idés
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Mr. Spock
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« Reply #3 on: September 05, 2012, 02:00:59 14:00 »

Actually what I want is something like this (See attached file).

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RaynW
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« Reply #4 on: September 05, 2012, 02:49:52 14:49 »

Sorry, this is the only appnote I found. It lacks dither, deadband and ramp controls.
http://www.maximintegrated.com/app-notes/index.mvp/id/4503

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