0-10V to isolated ±15V output. - Page 1
Forum section: electronics / projects

author: exosdel
author_rank: Newbie
timestamp: December 03, 2017, 04:53:31 pm
content: Hello!I´m trying to figure out the easiest way to create a ±15V output from a 0-10V input.What I´ve come up with is an 0-10V input, into a optocoupler, then 0-15V output... i think i need to pwm the input to be able to control the output ??then i think i need to use a relay to switch polarity ?I guess some of you guys have a much better way, if so please share...

author: Kalvin
author_rank: Super Contributor
timestamp: December 03, 2017, 04:55:58 pm
content: You may want to use an isolated dc-dc converter. Just google with keywords: isolated dc-dc converter

author: Jeroen3
author_rank: Super Contributor
timestamp: December 03, 2017, 08:24:40 pm
content: Quote from: exosdel on December 03, 2017, 04:53:31 pmSince you didn't specify any other design constraints than 0-10V to +-15V, I would go with this:An input stage for 0-10V to an AMC1200B, amplify the output to +-15V using opamps powered from recom RD-0515D supply.It's not the cheap way, but it's easy. +-15V isn't a common value, otherwise I would have recommended a Phoenix MCR module.

author: exosdel
author_rank: Newbie
timestamp: December 03, 2017, 09:01:34 pm
content: Im sorry about that. That AMC1200B was a really nice chip! I will add that to my good to know listOkey.This pcb will be put in an aleady existing device. I have 24VDC that i can tap on to.So i was thinking of just use the 0-10v input trough a optocoupler , then use a linear voltage regulator to get 15V out of the 24V supply, maybe some darlington setup on the other side of the optocoupler that is fed +15V, the ±15V is just signals, so just a couple of mA are requierd.But the biggest problem is that im not sure how to create the negative part, i can use relays, but i rather not, maybe i could make an h-bridge out of some transistors? Or is there an easier way?So, i have 0-10V in and I have access to 24VDC on the Output part.

author: Jeroen3
author_rank: Super Contributor
timestamp: December 03, 2017, 09:02:58 pm
content: Quote from: exosdel on December 03, 2017, 09:01:34 pmThen use theRD-2415D. And you don't need relays or an H-bridge. There are opamps that work with +-15V. Lots of them actually.

author: exosdel
author_rank: Newbie
timestamp: December 03, 2017, 09:57:17 pm
content: Wow, that's just perfect! Thanks alot!

author: mariush
author_rank: Super Contributor
timestamp: December 03, 2017, 10:35:37 pm
content: Depending on how much current you need, you could use regulators that use charge pumps to invert the voltage.For example TC7662 can do up to 18v input and you can configure it to output up to 40mA at -Vin or 2Vin :http://ww1.microchip.com/downloads/en/DeviceDoc/21468B.pdfLT1054 is more expensive and can do maximum 15v but can output up to 100mA :http://www.linear.com/docs/2309

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 04, 2017, 02:27:51 pm
content: How accurate? What bandwidth?If 10% nonlinearity and 10s kHz is sufficient, then optos will work. You will need a trimpot to set calibration.If precision is required, use an ADC+DAC with logic isolator.If precision and high bandwidth is required, just buy the oscilloscope isolator module.Tim