Buck-boost convertor design fault

Thread Starter

AaraAbdas

Joined Dec 11, 2012
5
I am trying to make inverted buck-boost design on proteus
Can someone tell me what error I am doing in connections ? also i havent read power electronics so I dont know much about desinging the convertor. Please give me some detail about it. Thanks in advance
 

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Dodgydave

Joined Jun 22, 2012
8,405
Think your diode D1 and inductor a L1 are in the wrong places , swap them round,anode to ov.
The way you have it the diode will give a negative output across C1 or is that your intention?
 

Thread Starter

AaraAbdas

Joined Dec 11, 2012
5
Yes it will give negative output. If i swap their position then it wont be buck-boost convertor. I m controlling the switch using PIC18F452. I designed it for input=12V and output=24V. according to this i calculated the duty cycle. PIC is generating right pulse but the circuit isnt giving the right output. I searched a lot about the designing convertor but didnt get much help :(
Where im doing wrong???????
 
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