Shadow_warrior
Member
Hello People!
I have to build a dc -dc converter with following specifications:
Later on, I found out that it has following demerits:
Bidirectional power transfer.
Thus I moved my focus to Dual Active Bridge. And there is only slight difference between single active bridge circuits and dual active bridge and that is, on output (HV) side, instead of diodes, mosfets/igbts are placed. So I natuarlly thought that current fed topologies will be better option. But it is complex and people have built high boosting circuits with voltage fed. I am unable to find advantages of current fed DAB over voltage fed? Only odvantage is since no inductor output is there in current fed, multiport outputs are convenient but I need only one output.
Also transformer saturation ican be avoided in CF (i don't know how)
Please suggest me which topology should I use?? I know it is a long post but I am really in trouble and I need to get this done anyhow. Thanks for taking your time..
I have to build a dc -dc converter with following specifications:
- Galvanic isolation between input side and output side
- input voltage 28-42V
- Output voltage 350V
- Output power 5KW
- efficiency >97%
- High power density
Later on, I found out that it has following demerits:
- It is an inherent buck converter so only way of boosting voltage was high transformer turns ratio. Hence more size and more loss.
- Involtage fed phase shift pwm full bridge input current has to go from negative peak to positive peak in very short duration(L{\frac{di}{dt}}) , hence leakage inductance of transformer had to be neglegible which is very hard to achieve.
- There is inherent loss of duty cycle in this type of converter which is not good for higher efficiency.
Bidirectional power transfer.
Thus I moved my focus to Dual Active Bridge. And there is only slight difference between single active bridge circuits and dual active bridge and that is, on output (HV) side, instead of diodes, mosfets/igbts are placed. So I natuarlly thought that current fed topologies will be better option. But it is complex and people have built high boosting circuits with voltage fed. I am unable to find advantages of current fed DAB over voltage fed? Only odvantage is since no inductor output is there in current fed, multiport outputs are convenient but I need only one output.
Also transformer saturation ican be avoided in CF (i don't know how)
Please suggest me which topology should I use?? I know it is a long post but I am really in trouble and I need to get this done anyhow. Thanks for taking your time..
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