can somebody explain to me why is this circuit not giving me the desired output?

 

hi eli,
Welcome to AAC.
Please post your LTSpice asc file
E

 

View attachment 356855
can somebody explain to me why is this circuit not giving me the desired output?

Hello, what output are you getting? Are none of the motors rotating?

 

Well, for starters the 10k resistors at the Fet's gates have way too high a value. They should be there not to prevent current from flowing into the gate, but to prevent ringing when switching at high frequencies. And their values are normally within the 10 - 100 ohm range.
Also, if you're planning on using PWM, normally only the high side Fets are switched. That means that normally only the high side Fets require said resistors.

 

hi eli,
Welcome to AAC.
Please post your LTSpice asc file
E

Hello Eric, please find the asc file attached

 

Hello, what output are you getting? Are none of the motors rotating?

this is my output. but the desire output that i am looking for is wave +70V ans -70V across the load(4k resistor and 0.8 H inductor). so i am trying to build an H-bridge logic level driver circuit (40 kHz; 140V peak to peak)

 

Hi eli.
Downloaded your asc file, please add the IR2184.lib so that I can create the model.
E

 

Hi eli.
Downloaded your asc file, please add the IR2184.lib so that I can create the model.
E

 

hi eli.
This is a test section of the main circuit, the IR2184 is not running correctly, where did you get the design?
E

 

hi eli.
This is a test section of the main circuit, the IR2184 is not running correctly, where did you get the design?
E
View attachment 356898

Hello Eric,
I got the design from here.
(1) IR2184 gate driver LT spice file | All About Circuits

Eliegeo

 

hi eli,
Reloaded all that data, same result, I am beginning to suspect the IR2184 model?

I will look for a different model.
E

 

hi eli,
Reloaded all that data, same result, I am beginning to suspect the IR2184 model?

I will look for a different model.
E

Hi eric,
yeh me too.
Thank you for your time.
looking forward to hearing from you
Eli

 

hi eli,
I also tried the IR2184S Infineon, same result?
E

 

hi eli,
I also tried the IR2184S Infineon, same result?
E

Hello Eric,

there is no asc file for the ir2184s :/ in the file you attached and i tried to look for the ltspice model on the internet for this product but i couldnt find it:/

Eli

 

hi eli.
This is part circuit asc file.
E

 

hi eli.
This is part circuit asc file.
E

hello eric,
the file is a circuit without the half bridge rectifier. i am giving up on this. do you think you can guide me to build an H-bridge for this project that i am working on?

eli

 

hi eli.
Check this modified circuit.
E

 

Hi eli,
Is this Homework or a college assignment?
E

 

Hi eli,
Is this Homework or a college assignment?
E

Hi Eric,
this is not a homework nor a college assignment. it is a project i am doing it on my own also regarding your circuit im not sure why but i am getting this as a result

 

Hi Eric,
this is not a homework nor a college assignment. it is a project i am doing it on my own also regarding your circuit im not sure why but i am getting this as a result View attachment 356907

i am also getting this warning message