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| DIC - Current fed double inductor push-pull and other current fed topologies |
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| Miyuki:
Hi folks, I want to ask is you have experience with current fed converters. I want to build 24V to 350V 1-2kW converter and current fed look more suitable for this high current low voltage inputs than classic voltage fed Im currently reading some papers about this topologies and double inductor push pull look most suitable for my power level and demand at i have just two switches and simple transformer without center tap at high current side |
| jbb:
Prasimix has been working on a step down converter using this topology here. What sort of voltage adjustment do you need? (Eg to handle battery voltage changes?). I ask because a resonant converter (eg full bridge LLC) could offer a higher frequency and thus smaller converter. But resonant converters generally don’t do well with widely varying voltages. |
| Miyuki:
Voltage vary by 8s LiFePO4 cells so 19-28V input |
| prasimix:
Hi Miyuki, CF-DIC topology is inherently good for step-up applications. You can easily achieve needed 1-2 kW and goes way beyond that if you are good in power electronic design. Possibly a good starting point for research is PhD thesis High Efficiency Power Converter for Low Voltage High Power Applications. Also I'd like to highly recommend usage of SiC diode on the output. As controller you can use LM5041 or MCU that provide overlapped gate signals. You don't need buck input stage (as is done in my converter) if it always has load connected. You can also define which is min. load below which one it will be stopped. Voltage regulation can be achieve it that case with variable overlap, that will appear on the secondary side as PWM. |
| Miyuki:
I also wonder if when I use voltage doubler at output will I need any way to avoid imbalance like modulate each side duty separately or implement some peak current limitation Or better to avoid it |
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