0 to 100V digitally controlled supply

jegonz · 17th September 2010, 07:08 AM

Hello!

Currently I have a 0 to 100V, 100mA power supply circuit build using the TL783, but the control the output voltage control is made with a potentiometer. Now I want to control this output voltage using a micro-controller. I thought of using a digital potentiometer to control it, but the system is not very stable. Basically I used a the digital potentiometer to control a OP-Amp to control the current of the adj pin, but is not working very well. Anyways using a regulator causes to much power loss, so its not good.
What I hope you can help me with is how to make a better controller, not necessarily using a voltage regulator, but maybe a PWM control for a switching supply to have a better result.

Thanks for any help

Sch3mat1c · 17th September 2010, 03:21 PM

I've already made one. The power supply section was designed for 0-5V operation but any voltage could be designed.

Tim

17th September 2010, 07:08 AM	#1
jegonz diyAudio Member Join Date: Sep 2010	0 to 100V digitally controlled supply Hello! Currently I have a 0 to 100V, 100mA power supply circuit build using the TL783, but the control the output voltage control is made with a potentiometer. Now I want to control this output voltage using a micro-controller. I thought of using a digital potentiometer to control it, but the system is not very stable. Basically I used a the digital potentiometer to control a OP-Amp to control the current of the adj pin, but is not working very well. Anyways using a regulator causes to much power loss, so its not good. What I hope you can help me with is how to make a better controller, not necessarily using a voltage regulator, but maybe a PWM control for a switching supply to have a better result. Thanks for any help

17th September 2010, 03:21 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	I've already made one. The power supply section was designed for 0-5V operation but any voltage could be designed. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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