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Have trouble figuring out what's wrong with the 220v inverter.

Navida

Jan 14, 2023
6
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Jan 14, 2023
Messages
6
Screenshot 2023-01-06 at 10.38.40.png
Hi, I made the inverter circuit as shown. But I used irfz44n Mosfet and a 7.6 - 0 7.6v transformer. First to make sure the circuit was working I tried with a 9v battery and then got the output of 121v. Then I connected to a used hybrid battery pack of around 15.8v. Suddenly a spark came from the circuit I think now the MOSFETs are blown. Can u guys figure out what's wrong? I am waiting for a quick reply!! Thank You!!
 

danadak

Feb 19, 2021
725
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Feb 19, 2021
Messages
725
Do you have a pic of prototype ?

An IRFZ has large input C, a 4017 cant properly drive it. Where did this
schematic come from ? Your 4017 cant provide adequate dead time
timing ......Do you have a scope so you can look at timing ?

You have no gate L supppresion resistors in circuit.




Regards, Dana.
 

Navida

Jan 14, 2023
6
Joined
Jan 14, 2023
Messages
6
I don't know much in deep about electronics. If u can, can u send me a diagram to make an inverter that works for a hybrid battery pack that has a voltage of around 15.8v and a transformer of 7.6 - 0 - 7.6v.
Thank You!
20230114_073312.jpg20230114_073322.jpg20230114_073330.jpg
 

Navida

Jan 14, 2023
6
Joined
Jan 14, 2023
Messages
6
Do you have a pic of prototype ?

An IRFZ has large input C, a 4017 cant properly drive it. Where did this
schematic come from ? Your 4017 cant provide adequate dead time
timing ......Do you have a scope so you can look at timing ?

You have no gate L supppresion resistors in circuit.




Regards, Dana.
I don't know much in deep about electronics. If u can, can u send me a diagram to make an inverter that works for a hybrid battery pack that has a voltage of around 15.8v and a transformer of 7.6 - 0 - 7.6v.
Thank You!
 

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danadak

Feb 19, 2021
725
Joined
Feb 19, 2021
Messages
725
Google "inverter design application note", lots of designs and help.

Many papers here - https://archive.org/search.php?query=inverter+design&sin=


1673694009637.png

Because of complexity (magnetics considerations, HV safety, PCB layout, component
selection) and general safety concerns might be prudent to hire some help
to do this.


Regards, Dana.
 
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