buck boost converter

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mamadiuze

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l used shotki diode but i have same problem
diode work correctly but i have 3volt at output
 

mamadiuze said:
l used shotki diode but i have same problem
diode work correctly but i have 3volt at output
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I'm afraid that you need to supply additional informations about this, such as circuit diagram, power voltage source and expecting destination voltage and current.



Best regards,
Peter
 

Hi
I want to build a buck boost converter with 5 to 12 input voltage. I want to fix output voltage at 12 volt.
I used this components :
f :20khz( use pwm pulse from avr microcontroller)
GH20N50 IGBT
120micro farad 400 v capacitor
Inductor 4.7 mh
6A10 diode
12 volt 20 watt halogen lamp as load
I drived IGBT with two BD139 transistor and it work properly.so I think driving circuit is true and igbt have no problem. but when I add diode ,inductor ,capacitor and load I don’t have any voltage at output.
I don’t know what is problem. Please help me. Thank you very much.
 

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