Sonsivri
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
May 23, 2018, 04:21:51 04:21


Login with username, password and session length


Pages: [1]
Print
Author Topic: [REQ] proportional valve controller circuit  (Read 1992 times)
0 Members and 1 Guest are viewing this topic.
Mr. Spock
Active Member
***
Offline Offline

Posts: 216

Thank You
-Given: 335
-Receive: 675



« on: September 04, 2012, 01:07:58 13:07 »

Hi all

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

Regards
Logged
RaynW
Newbie
*
 Muted
Offline Offline

Posts: 7

Thank You
-Given: 7
-Receive: 12


« Reply #1 on: September 04, 2012, 01:57:38 13:57 »

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
Logged
joator
Newbie
*
Offline Offline

Posts: 19

Thank You
-Given: 244
-Receive: 7



WWW
« Reply #2 on: September 04, 2012, 03:29:46 15:29 »

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
Logged

//Joator
Mr. Spock
Active Member
***
Offline Offline

Posts: 216

Thank You
-Given: 335
-Receive: 675



« Reply #3 on: September 05, 2012, 07:00:59 07:00 »

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

Regards
Logged
RaynW
Newbie
*
 Muted
Offline Offline

Posts: 7

Thank You
-Given: 7
-Receive: 12


« Reply #4 on: September 05, 2012, 07:49:52 07:49 »

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

Logged
Pages: [1]
Print
Jump to:  


DISCLAIMER
WE DONT HOST ANY ILLEGAL FILES ON THE SERVER
USE CONTACT US TO REPORT ILLEGAL FILES
ADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS

... Copyright © 2003-2999 Sonsivri.to ...
Powered by SMF 1.1.18 | SMF © 2006-2009, Simple Machines LLC | HarzeM Dilber MC