AMANORA
Newbie level 5

Hey there, working through my capestone project and I have wasted nearly 1 month or so trying to design an inductor for a smps.
Topology is 2 level vsc and power rating is variable, I can go as low as 300watts up to 3k watts depending on the core, coilformers and magnet wire price.
I have a question in mind. I have been trying to design my inverter with a ferrite core since there is no way I can get a silicon or a higher permeability material. I have been designing an AC inductor since I am going to synthesize a three phase DC/AC inverter. Ferrites are not suitable for 50/60 Hz line frequency. But it occured to me that I might need to design a DC inductor since during almost all of the switching cycle, there will be an average flux in the inductor, hence a dc inductor is needed.
Can anyone shed the light on this ?. I have spent too much time trying to accomodate a ferrite core to 50HZ line frequency but I am too tired of trying at this point and time is running out.
Should I design a dc inductor and choose the core based on the switching frquency not the line frequency ?.
I have designed for a DC inductor with the following parameters.
0- Core :
1- I max is around 6.3 Amps
2- BMax = 0.42
3- CoreLosses = 6 watts
4- Magnet wire = AWG25
5- V_dc bus = 80
6- Power/phase = 240
7- Number of turns = 77 turn
8- Air gap = 0.19 cm
9- accessories = etd59 coilformer and etd 59 clips
10 - L = 2e-3
Topology is 2 level vsc and power rating is variable, I can go as low as 300watts up to 3k watts depending on the core, coilformers and magnet wire price.
I have a question in mind. I have been trying to design my inverter with a ferrite core since there is no way I can get a silicon or a higher permeability material. I have been designing an AC inductor since I am going to synthesize a three phase DC/AC inverter. Ferrites are not suitable for 50/60 Hz line frequency. But it occured to me that I might need to design a DC inductor since during almost all of the switching cycle, there will be an average flux in the inductor, hence a dc inductor is needed.
Can anyone shed the light on this ?. I have spent too much time trying to accomodate a ferrite core to 50HZ line frequency but I am too tired of trying at this point and time is running out.
Should I design a dc inductor and choose the core based on the switching frquency not the line frequency ?.
I have designed for a DC inductor with the following parameters.
0- Core :
ETD59/31/22-3C90 |
2- BMax = 0.42
3- CoreLosses = 6 watts
4- Magnet wire = AWG25
5- V_dc bus = 80
6- Power/phase = 240
7- Number of turns = 77 turn
8- Air gap = 0.19 cm
9- accessories = etd59 coilformer and etd 59 clips
10 - L = 2e-3