Buck-boost convertor design fault

Discussion in 'The Projects Forum' started by AaraAbdas, Dec 20, 2012.

  1. AaraAbdas

    Thread Starter New Member

    Dec 11, 2012
    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
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    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?
  3. AaraAbdas

    Thread Starter New Member

    Dec 11, 2012
    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???????
  4. krutik

    New Member

    Oct 12, 2012
    you can see the TI's lm 62014 boost converter, data sheet and use guide