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Buck boost converter not working

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Phrancees69

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Hi engineers, I need help with my buck boost converter. I designed a high gain buck boost converter and it works perfectly on simulation (Proteus/Ltspice). However when I build the prototype on pcb and breadboard it doesn't work. My circuit has two switches; high and low side. I have tried ir2110 and hcpl3150 optocoupler switch drivers and the the drivers work just fine as they supply the required gate pwm pulses. but the main converter is not working. I also notice that whenever I turn on the power supply, the value drops drastically and there is no output from my converter. My circuit schematic is posted, kindly check to discover errors. Thank you
bbcnv.JPG
 

Hello, I recently discovered that current through my diode is as high as 7A in the simulation. But in my prototype I am using 1N5822 diode which has an average forward current of 3A. Hence, this could be the reason why I don't have an output since current is not passing through the diode. Kindly suggest any other diode type that can handle as much as 8A current. Also, before now i didn't supply any current from my DC power supply to my input, that's why the value diminishes when I energise the circuit. Thank you for your support thus far
 

parallel up your diodes - but remember the PIV on the diode is only ... 40V, go over this and bang ....
--- Updated ---

p.s. a 3A diode will in fact pass 7A no worries, just with a slightly higher forward drop, and hence a warmer temp rise - also the sw losses will be higher ....
 
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