Voltage Isolation Buffer

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eng.hmk Associate Join Date: Jan 2008 Posts: 44	Voltage Isolation Buffer 01/04/2014 2:51 PM
	dear all is there any model or type of voltage isolation buffer with following specification. input voltage (0-10V / max 50ma) output voltage (0-10v / max 2A) the voltage ratio is 1:1 i hope you help me with this issue i search internet but the problem in the high output current rating.
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#1 Re: Voltage isolation buffer. 01/04/2014 3:39 PM
	Opto isolator and then current amplifier....? May need to divide down the input current... Del __________________ health warning: These posts may contain traces of nut.
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#2 Re: Voltage isolation buffer. 01/04/2014 4:42 PM
	Good luck.
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Iris Guru Join Date: Jul 2010 Posts: 669 Good Answers: 176	#3 Re: Voltage Isolation Buffer 01/04/2014 8:13 PM
	What you describe sounds like a DC power supply with remote adjustment for supply's output voltage. Your 0-10V dc input is the control signal (remote adjustment) for the output voltage of the supply. The current draw depends on the load at that voltage. Usually voltage inputs are relatively high impedance. Your requirement to handle 50mA at the input probably requires an external dropping resistor. Acopian claims to have such a beast:http://www.acopian.com/adjustable-AC-DC-power-supplies.html
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eng.hmk Associate Join Date: Jan 2008 Posts: 44	#7 In reply to #3 Re: Voltage Isolation Buffer 01/07/2014 2:24 PM
	Dear all Thx a lot for your support, help but really I'm very interested in this answer
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geraldpaxton Guru Join Date: Nov 2012 Posts: 633 Good Answers: 13	#4 Re: Voltage Isolation Buffer 01/05/2014 10:28 AM
	This sounds like a problem I had 25 years ago with isolation and gain in automated welding systems I used to build. The solution was to build my own. Use an ICL 7650 chopper stabilized op amp driving a 2n2222 driving a TIP 30. An ICL7660 provides + - voltage for the 7650. A 7805 for 5v. By changing 4 resistors I can control gain. Examples.....065 gain for the OCV at the welder output and withstands a 3kv arc transfer pulse and provides 0-10v input to the analog input. 2 to 4 gain on analog outs to control motors and the weld supply....all on a 2"x3" board and about $20 in parts. I use 12vdc power for the board from a general purpose supply. If you need a higher current out change the TIP30 to a higher current device.
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SHOCKHISCAN Guru Join Date: Nov 2007 Location: Eastern Arizona mountains on Route 666 about a mile from God's country Posts: 1676 Good Answers: 122	#5 Re: Voltage Isolation Buffer 01/06/2014 9:15 AM
	If this is an altenating current application; install a simple 1:1 isolation transformer and it will clean the signal up dramatically. __________________ They said; "Brain size?" I heard; "Train size?" so I said: "I'll take a small one, thank you."
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#6 Re: Voltage Isolation Buffer 01/06/2014 11:27 AM
	That sounds like an electronic power supply unit; clearly there must be a source of power applied to the device, as the potential output power exceeds the input power by a factor of 40. So the available power voltage and frequency needs to be specified before a candidate can be considered. Is it DIN-rail mounted? Does it screw to a backplane or is it to sit on rubber feet? IP rating? How about the Lee Dickens range of signal conditioning blocks (usual disclaimer)? How about a car battery charger? KrisDel™ could probably design one - for a price, of course... __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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