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MOSFET Gets Hot in H Bridge

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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?
 

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
 

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

- - - Updated - - -

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

- - - Updated - - -

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?

- - - Updated - - -

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.
 

Attachments

  • INV-3.PDF
    50.8 KB · Views: 83
  • TD-3.1.rar
    21.4 KB · Views: 51
  • INV-6.rar
    37.1 KB · Views: 49
  • INV-6.PDF
    52.2 KB · Views: 59
  • INV-6.2.PDF
    53.3 KB · Views: 55
  • INV-6.4.PDF
    50.5 KB · Views: 73
Last edited:

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?
 

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