Power transformer selection for half bridge SMPS

[jegandren]

half bridge smps

hello all

I have jus designed a half bridge switching power supply of 300W , switching at a frequency of 100 Khz. now im in the mode of building the prototype...but i am quite blur on the type of power transformer that i should use...can anyone advise me on this matter.

Thank You

 

[Khabree]

half bridge transformer

You can use Ferrite Core 3C85 (E+I or ETD). It can be found in ferroxcube site and by the way this company also introduces 3C94 core. It can be used at this frequency easily. ENJOY

 

[sztibi82]

smps transformer calculation

Please give more details, and i can design you a a transformer, and post here the sketch-es.

i need primer voltage, current, and frequency range and secondary voltage.

 

[jegandren]

//www.electronicsoft.net/download/transformer.zip

Please give more details, and i can design you a a transformer, and post here the sketch-es.

i need primer voltage, current, and frequency range and secondary voltage.

Heloo sir,

Thank you very much for the reply, this are the details that i could provide you:

The primary voltage would be +168 V to -168V
The secondary voltage would be +56 V to - 56 V
switching frequency 100 Khz

output voltage to the load 25 V
max output current is 12 A
max output power 300W

 

[sztibi82]

half bridge power transformer

I calculated for you the transformer's data.
if you unse Kaschke 2004 ferite, you need 110mm^2 area of the core, or above. The primeri winding should have 12 and the secondary winding should have 4 spirals to have +-168/+-56 transformation.

Added after 31 minutes:

You can use Transformer Calculation v0.1.

You can download it from:
**broken link removed**

 

[CandleCookie]

Hello, I'm also going to build a prototype of the half bridge converter. I'm a bit confuse with the transformer part. The secondary transformer is 56Vpeak. So the the Vrms is about 40V. How to 25V at the load?