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I designed 12v/220v boost converter CIRCUIT; But didnt worked ?

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atifsheikh_91

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Hi all;
I am working on a transformerless Inverter ; for this I am willing to vary my 12V from 12V to 220V (i,e variable) & desired O/p current is 2A .. I designed all my components and kept there values as;

duty cycle=50% to 95%;
L=10mH ( is there voltage rating for Inductors too ; I used Resistor shaped Inductors) looked like this ; Inductors.jpg
C=220uf / 400V
diode=1n4007

schematics attachedboost_EDABOARD.PNG

Main Issue

When I assembled this and gave input from a power supply of 12v and 5A capacity ;I observed following outputs;

  1. When supply voltage 2V O/P is 4v
  2. when supply is 3v o/p is 6v
  3. but when supply is 6v Inductors burnt out



Please help me out ;

My Refrence Book is Power Electronics By MH Rashid


Regards Atif Sheikh
 

You probably have a 50% duty cycle. This explains the doubling of the voltage. You shouldn't attempt to use a boost converter to step up 12V to 220V. Duty cycle will be tiny. Peak current will be huge. Better to use a push-pull converter with transformer or any other suitable transformer-based converter.
The inductor you used is too small. It burns out because the wire in it is too thin and burns out as the current flowing through is greater than it's maximum capacity.

What is your switching frequency?
For boost converter at high frequency, you can not use 1N4007. You need to use a fast or ultrafast rectifier.

Hope this helps.
Tahmid.

---------- Post added at 23:13 ---------- Previous post was at 23:06 ----------

You can do a little more reading here:
Flyback Converters for Dummies
 

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