Electronics > Beginners

150W boost converter

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Siwastaja:
You need a feedback. Actually two feedbacks: the main one is current mode control for the boost converter. For this, you need a current sense resistor, and a current sense amplifier. You may be able to use the AVR's analog comparator; but the ADC is too slow at 10ksamples/s IIRC, unless you go for even slower frequency.

Outer voltage feedback can be slow and AVR ADC is fast enough, since you would need to slow it down anyway due to boost converter dynamics (so called right half plane zero; simply put, it will oscillate unless you filter voltage feedback to be rather slow).

This can be a good learning experience. Maybe you could reduce your power targets to, say, just 10W, then you could more easily go for even slower switcing which could make AVR more suitable. It's far from sane design, but for learning purposes, very good.

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