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Laboratory power supply schematic needed

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drabos

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laboratory power supply schematic project

Hello,

I want to build a laboratory power supply. With CV/CC function, -30..30 V, max. 5 A

Has anybody a schamatic for this?
Or did somebody this type of project?
 

Now, I have a 220V/12V transformer.
I wan to build with it a 0..30V power supply.
Do you have any idea?
Or I just build a 0..15 V power supply?
 

You can make a step-up convertor. It can also make a negative voltage.
But it will require a different approach to design it. Switching PSU is better done with a µC.

There are several IC for that purpose, and all you need to put outside are one or two coils, some resistors, capacitors and external switching transistor.

Output voltage is controled through a voltage divider (output voltage is divided and compared with an internal reference, and then it corrects the switching frequency to compensate the voltage differece).
Efficiency is between 70 and 80 %.

Here is one way to do it.
 

    D

    drabos

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That depends on how do you feel about it ..
If you need just a power supply I would use LM317 or L200 - adjustable voltage regulastors - to produce adjustable output voltage and LM7805 and LM7812 fixed regulators to produce fixed +5V and +12V output voltages, which, quite often you may need for digital or analog circuit .. see picture below ..
All these voltage regulators can share common rectifier bridge and smoothing capacitor .. After all, you have only one secondary winding, which is 12Vac ..

Regards,
IanP
 

    D

    drabos

    Points: 2
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