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well this is a buck boost circuit and i am asked to design it to take an ac input of 90-240V and a fixed dc output of 5V
i asked my proffessor this is what he said :
There are several thing you need to include. You are starting with an AC signal, how do you get a DC from that? You can get use a PWM source to control different duty cycles. I am not asking you to build a control circuit, so just have different simulations for different duty cycles.
I hope this makes it a little clearer,
so i thought that we could use a rectifier to get it to change from AC to dc
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