MOSFET Gets Hot in H Bridge

[baileychic]

Okay, increased the C1, C4 capacitors to 22uF but no change in output.

I am using 50% duty PWM. Should I increase the duty to say 90% to get high output voltage of say +22V or +24V?

 

[KlausST]

Hi,

As already said: high duty cycle makes things worse.

Show us scope pictures (HIN, 12V directly at the driver, highside_out, 24V supply) and a photo of your circuit, including the scope connections.

Klaus

 

[baileychic]

Here is the simulation output. I have not yet built the hardware.

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Updated file. VSx probes added. See the graphs and tell me how to fix the high-side voltage issue.

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Edit 2:

Only getting correct output when dual supply is used for IR2112.

Refer INV-6.2.pdf

Can't the issue be solved without using dual supply for IR2112?

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My conclusion with the circuit analaysis is that the voltage at COM pin of IR2112 should be equal to the GND voltage of Full-Bridge. So, I used -24V.0V for IR2112 COM pin and th eoutput is okay but will the high-side mosfets handle 60V of HOx signals for IRFP064V?

Also, the VSx voltage should swing between +24V and -24V same as Load.

 

[baileychic]

I replaced the Mosfets to IRFP250N.

For PWM signal > 50 kHz the output signal is getting distorted and also the HOx and LOx signals. What changes are needed to the circuit to get clean output for 300 kHz PWM?