Ok no worries,I can help but forget about facetiming. I'm not comfortable with that level of familiarity and giving out my phone number.
You are looking for a boost ratio of 5/0.4 = 12.5, or 12/0.4=30. Both of these boost ratios are well outside the normal range for simple boost converters which top out at about 6-8. At those and higher boost ratios they become very difficult to control with any degree of precision. This points us in the direction of using a transformer in either a forward or flyback configuration. If neither of those configurations are practical there are more complicated topologies, but IMHO they are not suitable projects for a novice designer in switch-mode power supplies.Ok no worries,
I suppose with an absolute maximum of 4.5 Volts on Vout, that will get him close to 5V, but nowhere near 12V. It looks like a transformer is an integral part of the requirements for this circuit.
What you want, if I understand correctly is to go from a source of 0.4 Volts at some unspecified power level to 12 Volts at SOME MUCH LOWER POWER level and then to your inverter to 240 VAC at some power level which will be vanishingly small. The reason your head hurts is because you are trying to do the impossible. Get you head out of the dark place it is in, and LEARN the basics of power conversion. In particular:Yes as much as possible 12v will be great enough for what I want to achieve as I have an inverter to 240v
No Bud! You have manifestly refused to specify an output power level or current requirement. AC or DC is completely irrelevant for the time being, and you were the one who mentioned an inverter which is a DC to AC converter.Thanks for trying but that's for ac bud need dc
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