QUOTE=P.S.RAJU
thanks for your reply silvio,
this is the circuit i have used ,1)the circuit is half bridge topology,2)the supply input volt is 230volt 50hz,3)transformer material is cf139cosmoferrites,
4)2step means i have made 2 different voltage ,-+60and,-+120volt dc.
5)i used igbt instead of mosfet to increase the watts. igbt no,30n60a4d
6)i want to get maximum power from etd 49,
7)so tell me what frequency should i keep to get 60volts and also the winding turns
8)the above image is my final design the circuit and design is perfect only the the transformer iam not able to do it properly
waiting for your reply
thanks p.s.raju[/QUOTE]
Hi Rayu I have worked out the windings on the data you gave me. I have posted a couple of pictures for you to see if I understand you correctly about the 2 step windings.
I have understood that the amplifier will be working most of the time on 60v and then when there is peak current draw on high volume setting a mosfet will switch the other half of the secondary to maintain the voltage. The first picture will show the winding configuration. The current in the second half of the winding will be somewhat lower due to the higher voltage. However I opted for a current draw of 8 amps for this winding and around 12 amps for the main 60v winding.
The PDF file will show all the details of the windings including number of turns, number of wires 0.5mm for different current rating (9 wires of 0.5mm for main 60v and 6 wires for 120v. You need 12 wires (18 amps) for the primary
Please note that the workout voltage on the software is written down at 50v but this is the loaded voltage with an inductor in the output included, however the peak voltage will be around 61v at the rated input voltage. You can see the real unloaded voltage peaks in the small box in the lower middle of the software. The amplifier will be working around the peak voltage most of time.
I have also included +-15v for you and also output for fan motor
If you have difficulty in understanding please ask and I will help you.