can any one give me the detals of a circuit which will convert 220V AC in to 12 V or 5V DC or provide both the output, it can be a SMPS but without using any type of transformer
is it posible ?
I have no idea what the word "FOOR" is or where it comes from :?
But what I can say is, ignore what I just said and take the transformer route, you'll love it!
I have no idea what the word "FOOR" is or where it comes from :?
But what I can say is, ignore what I just said and take the transformer route, you'll love it!
i am talking about core size , material , wire thickness and what should be the rasio of winding
when designing a transformar in a smps how to calculate these values?
Just to turn things around, how would it be if I said "making an SMPS is easy but I dont understand transistors, I want to eliminate them"
Not much of an SMPS any more!
While typing it occured to me that you could build an SMPS without transistors by using a "vibrator".
Anybody else old enough on this board to know what I am refering to?
LOL, JimB, ah the vibrator. Bane of the automotive electric world for years. Well it kept part dealers in business I guess.
I'll add my 2 cents.. use a transformer, save yourself the aggravation, shocks, exploding bridge rectifiers, damaged test equipment and band-aids for better use.
While typing it occured to me that you could build an SMPS without transistors by using a "vibrator".
Anybody else old enough on this board to know what I am refering to?
Yes, I've worked with them in the past 8) - you could even get 'syncronous' ones, so you didn't require a rectifier (which is the sort of thing WilliB is trying to do in another thread!).
However, they were used to generate AC to feed a transformer from a DC source (usually car batteries, to feed valve equipment), so aren't really appropriate for an AC mains powered PSU.
In the same vein?, do you remember motor/generator sets? - an even more crude way of doing it! - simply a 12V DC motor, mechanically coupled to a higher voltage dynamo. Feed 12V DC in and get 300V DC (or whatever the dynamo is designed for!) out.
However, they were used to generate AC to feed a transformer from a DC source (usually car batteries, to feed valve equipment), so aren't really appropriate for an AC mains powered PSU.
Exactly, as appropriate as an SMPS without a transformer!
Nigel Goodwin said:
In the same vein?, do you remember motor/generator sets? - an even more crude way of doing it! - simply a 12V DC motor, mechanically coupled to a higher voltage dynamo. Feed 12V DC in and get 300V DC (or whatever the dynamo is designed for!) out.
Yes I have one hiding somewhere, 12v input and about 275v 60mA output.
I have never used it but it seemed just the thing to have at the time for about 6d (2.5p !).
The 'Instrument supply rail' on earlier cars was fed from a very
crude SMPS(Switched Mode Power Supply) which delivered a 10 volt
(average) supply to run the instrument panel.
It was just a HotWire/BimetalStrip arrangement whiched switched
the 12 volt battery on and off to provide an average of 10 volts.
It switched fairly slowly too, but older instruments were even
slower to respond, so it worked fine.
There might be even simpler SMPS systems about.
Yes, i recall the old DC-Transformers or rotary transformers as
some people called them. I have a few myself.
Try to find the project in the POWER category,
it is well designed, I have tried to build one and yes, very dangerous. and to much ripple from the output