0-10V to isolated ±15V output.

[exosdel]

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...

[Kalvin]

You may want to use an isolated dc-dc converter. Just google with keywords: isolated dc-dc converter

[Jeroen3]

...the easiest way to create a ±15V output from a 0-10V input.

Since 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.

[exosdel]

Im sorry about that. That AMC1200B was a really nice chip! I will add that to my good to know list
Okey.
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.

[Jeroen3]

But the biggest problem is that im not sure how to create the negative part

Then use the RD-2415D. And you don't need relays or an H-bridge. There are opamps that work with +-15V. Lots of them actually.

[exosdel]

Wow, that's just perfect! Thanks alot!

[mariush]

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.pdf

LT1054 is more expensive and can do maximum 15v but can output up to 100mA : http://www.linear.com/docs/2309

[T3sl4co1l]

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