| darkkiller |
Hi.This is my first smps design and i need help. If you can help me i will use it on my car. And I KNOW it is not good system.This is my first :)
I found this circuit from another site. They are saying this can give 600w. I did this with EE-33's. I found them from pc power supply's.
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| darkkiller |
Sorry that was the old circuit.I couldn't edit the post.This is im using.
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| Tolik |
As I understand, its regulated push pull topology.
So,
1. differential mode inductor between rectifiers and output capacitors MUST BE USED !!!
2. Input filter -single 22000uF capacitor...:eek: Are you able to get military grade cap with ESR & ESL low enough ? If not, go for 4-5x4700-6800uf , 16..25V regular caps.
3. Feedback loop. There is good idea to limit frequency bandwith before optocouplers, but not by connecting F depending loops to PWM`s EA. Much better to use single optocoupler, with differential voltage sensing by opamp.
4. Its good idea to add 2 small inductors, one from + to PWM control, the second from PWM control to ground. You will disconnect you most sensitive stage from AC RF/HF noise sources.
5. For just 600W I was going for single toroidal trafo. If SMPS should to power audio equipment, the toroidal or PM cores MUST be used, due to best shielding of magnetic emission.
Voltage mode control and push pull topology are not the best friends. Current mode controllers much more reliable. |
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