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about a power supply project

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rippy

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I am a student of electronics in Greece and i have a project about a integrate power supply circuit(all stages)of any voltage and current.I have to explain the operation,the role of the components etc..When can i find information about this?Can you help me?Please your answers here: [email protected] Thank you in advance.
 

kinjalgp

Active Member
Try using LM317 IC based regulated power supply. You can find its datasheet on www.national.com. Regarding the working of each componenets, you can find it in any good power electronics or operational amplifiers text books.
 

kinjalgp

Active Member
Hi,
The text books I know are only available in India and my not be available in your country. They are written by Indian Authors. But still the name of the text books are.
1) Operational Amplifiers - Ramakant Gayakwad
2) Operational Amplifiers - Botkar
2) Power Electronics - Bhattacharya
 

mechie

New Member
Bang Smoke ?

I think you will struggle to explain how this circuit works, the transistors appear to be from a different circuit to the rest.

It seems to be using a 'positive rail regulator' in the negative rail ???
 

kinjalgp

Active Member
Yes correct MECHIE. Do you think that the NPN Transistor Q1 will work in the configuration it is connected? Collector is at lower potential than Emitter :!:
 

rippy

New Member
SO,WHAT DO YOU SUGGEST ME TO DO???I HAVE TO GIVE MY PROJECT IN A FEW DAYS!WHAT HAVE TO BE CHANGED SO THAT THE CICUIT WORKS?
 

mechie

New Member
Quick thoughts on power supply

Just a -very- quick look at the circuit -
I think every diode and every polarised capacitor wants swapping round end for end. The transistor Q1 will then be in the positive line and (conventional current flow) the current will flow into the collector and out of the emitter. The Pos and Neg output terminals need their labels swapping round.

The circuit then starts to look like the one here on ETO in the 'Electronic Projects' section labelled "Stabilised Power Supply with Current Limiting", which also has a bit of waffle explaining operation.

I don't mean to kill you off but is it right that we appear to be doing homework here? (just a thought :wink: )

Kinjal I have seen transistors used backwards for real weird circuits, I think there is some frequency response improvement or something (up at GHz) - I forget - but this configuration is as rare as hens teeth :?
 
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