| Electronics > Beginners |
| 150W boost converter |
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| electroguy98:
Hello everyone, this is my first post on eevblog. I have basic knowledge about electronics and I'm trying to make a 150w boost converter for driving a 100W strobe led. The calculated values(switching frequency=32kHz) for inductor and capacitor are 100uH and 265uF respectively. The problem is that the inductor requires a current rating of 12.5A but i can't find it anywhere so i have to wind it on a plastic core. I will be using 21 AWG(0.8mm diameter) copper wire. Will it be able to handle the current? Thanks! |
| Siwastaja:
Input and output voltage? Why such as low frequency? Go higher, and your inductance requirement drops, and you'll most likely find a suitable inductor. For 22 or 33 uH, you should be seeing a lot of results for your saturation and thermal current rating. Winding your own isn't impossible, but you have more things to calculate and estimate than just the wire thickness. Ferrite cores and bobbins are bloody expensive. This site is the most helpful inductor design tool ever: http://pigeonsnest.co.uk/stuff/core-saturation.html (easy to remember and find by googling "core saturation pigeon"). But it's highly unlikely you need to do custom inductors. I just designed a 750W, 22 to 75V 4-phase boost converter and was able to use off-the-shelf inductors, I even had multiple parts to choose from. If the ratio between input and output voltage is big, say, over 1:3, you may want to consider multiphase converter, easing ripple current ratings and thermals by dividing the heat over larger number of parts. |
| strawberry:
iron powder core T130-26 core will reduce turns count for same inductance |
| Arjunan M R:
https://www.powerstream.com/Wire_Size.htm I don't think 0.8mm wire can handle that much current. I don't recommend building an inductor yourself(unless you have an LCR meter) |
| soldar:
--- Quote from: Siwastaja on June 02, 2019, 11:29:54 am ---Ferrite cores and bobbins are bloody expensive. --- End quote --- And sometimes difficult to find what you want. That is why I have crates full of computer and other SMPS where I can recycle plenty of transformers and chokes. Sometimmes I find what I want directly, sometimes I can modify, sometimes I put them in series or parallel. |
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