Hi. I need help regarding my project which is bidirectional interleaved flyback converter. As you can see, my main waveforms should be as shown in the picture below for VS3,g, iS3, VS4,g and iS4. However, when im trying to simulate my circuit the current for iS3 and iS4 not the same as the expected output and I cant seem to get the same output. Can you help me in this matter? I also attached my matlab simulink file below.
My parameters are as follow:
Vin = 190 V
Vout = 48 V
Duty cycle = 0.45
Switching frequency = 65kHz

 

You'll be lucky to get someone to run the simulation, but by inspection I think your P-side MOSFETs are 'upside-down' - or your power source is. A P-channel MOSFET's Drain is usually -ve wrt the Source, an N-channel's Drain is +ve wrt Source...

Not sure why you need P-channel here. All the examples I've seen in reference designs use N-channel both sides...

 

You'll be lucky to get someone to run the simulation, but by inspection I think your P-side MOSFETs are 'upside-down' - or your power source is. A P-channel MOSFET's Drain is usually -ve wrt the Source, an N-channel's Drain is +ve wrt Source...

Not sure why you need P-channel here. All the examples I've seen in reference designs use N-channel both sides...

Correct me if I am wrong but I think I am using N-channel there since the arrow goes inside and not outside

 

No, my bad, you're right. It was the p-side & n-side that confused me, I'd convinced myself the arrow was the other way round...

 

No, my bad, you're right. It was the p-side & n-side that confused me, I'd convinced myself the arrow was the other way round...

it's okay, i got it already, my position for mosfet s3 and s4 is at the wrong place. thank you!!!

 

Sometimes just asking the question can remove 'blindness'

I'm intrigued by this simulation... can you post the corrected Simulink file. I've just installed the latest MATLAB/Simulink release and would like to run this simulation.

 

Sometimes just asking the question can remove 'blindness'

I'm intrigued by this simulation... can you post the corrected Simulink file. I've just installed the latest MATLAB/Simulink release and would like to run this simulation.

Here is my corrected simulink file. However, can you check my simulation since it should get output of 48 V but when i try to run, it does not get the expected output. Maybe i have made some mistakes at any parameters.

 

I managed to get the expected waveform, however, the output voltage not the same as the expected one. It should be 48 V since I have set the parameters of Vin = 190 V, Switching frequency = 65kHz, Vout = 48 V and Duty cycle = 0.45. As you can see in my simulation below, I only get the output of 15.97 V. Also i attached the parameters for each component and also my simulink file.

 

Are your transformer specs based on a real transformer? Or how did you arrive at them?

 

Are your transformer specs based on a real transformer? Or how did you arrive at them?

No, i think i just use linear transformer or ideal transformer because i am not quite sure with that