SMPS Battery Charger Design Help

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baileychic

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SMPS Battery Charger Design Help

I am designing a SMPS Battery charger.

The AC 220V (180V to 250V) is converted to 325V DC and is fed to SMPS transformer. a 100 uF 500V Capacitor is used to filter the 325V DC.

My question is can I use single switch forward converter with SMPS transformer to get the DC-DC Converter working. I need to get 14.6V boost charging voltage after diode drops.

The Battery charger will be 12/24V 10A type. SMPS transformer will be designed to handle max 15A.

Power of transformer secondary side is 24V * 10A = 240W

As power requirment is less than 350W can I use single switch forward converter ?
 

Vs = 27V max @ 10A

Is = 10A

Vs = 27V

Vp = 325V

Ip/Is = Vs/Vp

Ip = (Vs/Vp) * Is

Ip = (27V / 325V) * 10 = 0.83A

Ppri = VpIp = 325V * 0.83A = 270W

Can I use single switch forward converter for these values ?
 

This new question is related to this project only that is SMPS Battery Charger Design and hence I am asking this new question here only. The new question is related to Output Inductor design.

I am referring this article.

https://tahmidmc.blogspot.in/2013/03/output-inductance-calculation-for-smps.html

My Vin(max) = 354V and Vin(nom) = 325V DC.

According to the formula in the above link I am getting this value for Inductor.

(17.43 - 16) * 9 * 10^(-6) /(1.4 * 15A) = 6.12e-7

= 0.612uH = ~ 1 uH

So, can I use 1 uH 15A Inductor ?

I will be using ETD39 core.


No. of turns for Inductor

= sqrt(1000 / 64) = ~ 16 turns.

Is this correct ?
 
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