Electronics > Projects, Designs, and Technical Stuff

DIY Variable Multi-Output Power Supply Project

(1/3) > >>

Kippre7790:
I have been learning about switching power supplies, namely buck and boost transformers but LLC transformers as well and I am really excited at making my own power supply now that I see how powerful of a tool they can be. I am learning electronics as I go along so there may be some simple concepts and rules of thumb that I may be missing but I'm not shy to learn. I'm open to criticism and better opinions on the designs but it would be awesome if you can provide explanation on new concepts and confusing ones as I am learning as I go along. Here is a block diagram of the way I'd like to see the power supply function.



The following are the targets I would like to achieve in the design. However it could hit these points is fine with me.

*Can supply +100W of power and a decent amount of current.
*Does not require much heat dissipation. (efficiency?)
*Outputs a wide range of voltage adjustment. (60v?)
*Multiple regulated voltage supply outputs.
*Regulated output for a basic oscilloscope (From China)
*120v AC plug capable of TRIAC/AC PWM adjustment.
*Can be carried in a backpack or something.
*Can be rescaled to larger power outputs without completely redesigning. (optional)
*Limit the use of complex IC's and code based Chips.
*Prefer using only through hole packages where possible.
*Keeping frequencies under 150khz for scope visibility.

I know it's not a small project and all but I want to have a power supply that is good and doesn't have many power limitations.
I will post progress and notable mentions below.
------------------------------------------------------

Kleinstein:
This sounds like a single complicated large project. For a start there are too many points of failure. So usually it is better to start with separate parts and only put the things together one the single parts work. Other wise it tends to be a project that never gets finished.

The usual way to build a multi channel supply is to have completely separate channels that essentially only share a case and mains transformer. So it would be just more boards of a single channel supply. Separete Supples can be used in series, with a common ground or with a little extra circuit also in parallel.

A SMPS directly from mains can be tricky an is definitely not a beginners project. There are some dangers involved and it needs some experience and suitable gear to work with mains safely. It may be easier here to start with a ready made SMPS to some 24 .. 48 V.

Kippre7790:
oh yes I am breaking it down but I wanted to provide an overview of my plan.
would a transformer that brings it down to those voltages work then use SMPS to adjust as needed?

DannyTheGhost:
As stated above, it is indeed very serious project. You still didn't answer several more questions for yourself:
1. More exact total power output
2. What kind of output noise you want to get out of it
3. Do you need isolated output channels (in case if you want to make bipolar supply)
and so on.
I suggest you to look more closely on professional lab PSUs and their topologies to have more clues about what you actually need.

Kleinstein:
It is a slightly unusual combination to use a transformer and than a switched mode regulation. However there still is some use to it: the 60/50 Hz transformer can give isolation against common mode noise. So it likely would not be as clean as a pure linear supply, but can avoid some of the interference of a full SMPS solution.

If the power level is not that high, one could still go pure linear, and leave the pre-regulation for a 2nd higher power version.

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod