1.5 KW switching regulator

[meysaminter]

Hi All,

I want to build a 1.5 KW switching power supply input voltage is 80-230 v . I want to use full-bridge topology . the tl494 and sg3525 are my choice now . does any one have a shematic ?

 

[goldsmith]

Dear meysaminter
Hi
You can refer to the datasheet of SG3525 or tl494 , they suggested some circuits that you can develop them simply . did you see the full datasheet of them ?
BTW : you'll need a ferrite transformer for your aim . do you know about it's calculations ? if no , i can help you .
Wish you the best
Goldsmith

 

[meysaminter]

i really appreciate your help Mr.goldsmith . I'm from Iran too . now I'm reading the datasheets and soon I will use you experience . thanks.

 

[vimalkhanna]

Love to help you for the 1500w SMPS stage Use an IR1150 for drives ...Are you also getting a PFC at input stage?.

 

[meysaminter]

Thank you for the reply, is IR1150 is better than sg3525 and tl494?

 

[goldsmith]

Again Hi
It depends on your application that what IC is ok.
respect
Goldsmith

 

[meysaminter]

Dear goldsmith ,
Can you explain about the usage af ICs?

---------- Post added at 17:31 ---------- Previous post was at 17:27 ----------

Love to help you for the 1500w SMPS stage Use an IR1150 for drives ...Are you also getting a PFC at input stage?.

yes it seems to be a PFC at input

 

[goldsmith]

Again Hi
My mean is :
For example , uc3844 or3845 , designer for fly back converter , and with simple changes , we can prepare it for a simple forward converter .
and with hard changes we can use it for the other categories . BUT SG3526N , usually , designed for push pull converter or H bridge ( with some changes ) or half bridge(directly)
And each arrangement depends on your power , and the frequency of operation , and the money that you want to pay .
Best Lucks
Goldsmith

 

[vimalkhanna]

Fine Goldsmith,,,however ,,flyback is OK for 200-300watts.For power >1kw we need to combine flyback + feedforward ..
Alternately , go for pushpull designs which can deliver upto a few kilowatts .
For this we need to go for synchronized bipolar pulses driver ...As such 3525 or 3526 are ideal drivers .

 

[goldsmith]

Dear vimalkhanna
Hi
Yes , you are quite right about maximum power of fly back ( however i saw some continuous modes with 450W ) .
and about push pull , i think it will be ok for the powers up to 1KW . ( approx) . and about H bridge: it will be ok for very high powers . and for highes powers we can design a modular SMPS , with master slave feed back .
Respect
Goldsmith

 

[meysaminter]

ok , So full bridge topology seems to be proper for 1.5 KW SMPS .
My question is wich IC has simple designing .

 

[meysaminter]

I decided to work with tl494 .

 

[goldsmith]

Again Hi
Good choice , but can you tell us the reason ?
Best Wishes
Goldsmith

 

[meysaminter]

Mr. goldsmith , the reason is the popularity and Availability of TL494 in Iran . and the examples of this part is more than others .

 

[goldsmith]

Again Hi
Well .
As we know , it has 2 out put . and you'll need a way to drive another mosfets . e.g : transformer or mosfet drivers , such as IR21XX series .
Good luck
Goldsmith

 

[meysaminter]

Hi , I designed a simlpe circuit for full bridge topology .it is attached. PLz help me to currect and upgrade it .

 

[meysaminter]

I placed 4 mosfet drivers . and first correction attached . I am waiting for your Idea obout it .

 

[FvM]

- the low side transistor current sense resistors are placed wrong
- IR2125 is non-inverting and need's to be driven by E rather than C outputs
- load resistors for TL494 C respectively E outputs are required, refer to datasheet
- you are connecting output voltage feedback directly to TL494. If you want to have galvanic insulation between input and output, the voltage feedback needs to use an optocoupler
- phase shift would be a better way for H-bridge output regulation, but doesn't work with TL494

 

[meysaminter]

I corrected the current sense resistors and working to use an optocoupler in feedback. but I dont undrestand what is C and E outputs:sad:

 

[FvM]