Newbie need help on SMPS

[elnec]

Hi all,

can someone give me some info how smps work and how can i make one.

i need two output from that smps which are +35v and +-15v

Regards,
Elnec

[areza]

you can start with the books

BROWN, M. (1990). Practical Switching Power Supply Design
BROWN, M. (2001). Power Supply Cookbook (2nd ed.)
Switching power supply design . ABRAHAM I. PRESSMAN

[wakibaki]

smps + newbie = bad news.

Average 3-year electronics graduate still cannot design an smps.

The information is available through google anyway, or from manufacturers datasheets and application notes.

You need to start with building from an existing design. Better to start with a simple chip-amp and/or linear power supply.

w

[elnec]

Originally posted by wakibaki
smps + newbie = bad news.

Average 3-year electronics graduate still cannot design an smps.

The information is available through google anyway, or from manufacturers datasheets and application notes.

You need to start with building from an existing design. Better to start with a simple chip-amp and/or linear power supply.

w

"Average 3-year electronics graduate still cannot design an smps." as for this, i am electronics graduate

can u give me a example of existing design?

[alvaius]

Elnec,

You can imagine why someone would assume that you are not an electronics graduate. Most electronics graduates would define the problem better than you have. An electronics graduate would also know how to research a problem such as what you asked and not ask such an open ended question for which the replies would be likely as open-ended and lacking value.

You have defined +35v, and +-15V. That is like saying I need a car, but not saying whether you need a toy car or a real car. What about input voltage, output currents, output ripple, etc.

You will find when you ask clear questions, you will get clear answers.

Alvaius

[elnec]

Alvaius,

You can imagine why someone would assume that you are not an electronics graduate. Most electronics graduates would define the problem better than you have. An electronics graduate would also know how to research a problem such as what you asked and not ask such an open ended question for which the replies would be likely as open-ended and lacking value.

as i have not worked on power supply so i ask you ppl for some info on power supply

You have defined +35v, and +-15V. That is like saying I need a car, but not saying whether you need a toy car or a real car. What about input voltage, output currents, output ripple, etc.

You will find when you ask clear questions, you will get clear answers.

ok, Specifications are
input voltage : 220v to 250v at 50Hz
ouput voltage: +35v at 6A and +-15v at 1A

Regards
elnec

[wakibaki]

Google > smps > 1st. line

Google > smps circuit > 1st line > SMPS Design > POWER SUPPLY SCHEMATICS FOR ENGINEERS AND HOBBYISTS - 12Volt AC-DC > schematic

w

[areza]

please dont get urself killed , buy a commercial unit or build a linear power supply, 240 watts off line smps in not something someone should build if don’t know how to keep things safe and how it works, smps is not something some one can master overnight ,

[mahmood]

Hi areza
look you need some informations about power electronic . for
example :
you msut know what's difference between MOSFET , IGBT and BJT
And how them drive and work . you must know about PCB
designing . just know about EMI . don't busy your brain on detail .

i was a man like U in 5 month ago . but now i can design a power
unit for myself project . i started with this attached schematic .
for the first step in google search , lookfor
switch mode power supply or SMPS topology .

discoverer is finder

[mahmood]

And this