Simple boost converter - differences between reality and LTSpice

• Simple boost converter - differences between reality and LTSpice
  Posted by Momchilo on 30 Apr, 2017 23:04
• Hello,
  I built a very simple boost converter on a breadboard and measured the output voltage across the capacitor without a load.
  The measured output voltage is 6.2V and the input voltage is 3V (see figure).
  I simulated this circuit in LTSpice with the same parts (standard lib) but the output voltage is only 4.5V.
  Any ideas what I have to change in LTSpice to get the 6.2V?
  Thanks for your help.
  
  Best regards
  Momchilo
  

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• #1 Reply
  Posted by ebclr on 30 Apr, 2017 23:07
• The inductor is a key component, try change there
• #2 Reply
  Posted by Momchilo on 01 May, 2017 01:24
• Thank you for the hint ebclr. I calculated the inductance of the used coil over the frequency with a scope and a voltage divider (I don't own a RLC meter) and the result is L=53.6µH. According to the Chinese manufacturer the inductance should be 33µH 
  With the new value the output voltage in the simulation is the same as in the reality.