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convert analog to digital through pic

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Irfansw07

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DC DC converter

I am working on boost converter with PWM generator as VerilogA.
When switch2 and switch3 are close and other switch remain open(off) than there is still some current remain in the Inductor.
I was wondering that if both switch2 and switch3 when close than Inductor current must be zero and difference voltage in Inductor is zero which is not occuring in my circuir at the moment.

I am hereby attaching the circuit ..

Can anyone please give me the reason for this ?

Thanks in advance
 

Re: DC DC converter

your schematic looks like a noninverting buck boost.
S1 and S3 should be ON at the same time with S2 and S4 OFF.
S2 and S4 can be diodes.
 

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