Hey..

My i am trying to simulate the dual switch flyback.
Vin - 48vdc, vout = 1000V, 2mA.

I am not sure about the gate drive, what kind of gate driver should i use, do we need high side gate driver for m1 and low side gate driver for M2.
This is digital based power supply so i will be giving 60KHz PWM signal from microcontroller.
Any idea and suggestion are highly welcomed.

 

Hi mishra,
Please post the LTS model for the TLP2766A.
E

 

Hey E,
thanks for jumping in the discussion and taking the lead.
here you go.

 

Hi m,
Got your models, thanks.
One small error on your asc circuit, I will run the sim later.
E
@mishra87
Also, don't use '0' for these rise/fall times.

 

With the schematic in post #1 if you switch on M1 you will destroy M1 and/or D8.
Switching on M2 no current will flow.

Les.

 

t

Hi m,
Got your models, thanks.
One small error on your asc circuit, I will run the sim later.
E
View attachment 313144

Thanks, looking forward to hear from you soon. !
Thanks once again !

 

With the schematic in post #1 if you switch on M1 you will destroy M1 and/or D8.
Switching on M2 no current will flow.

Les.

Hi...I am here to learn from you guys.
Could you please explain the reason ?

 

hi m,
The Gate drive voltage waveforms are not suitable for driving MOSFETS, also there are a number of other design problems.
E
E

 

hi m,
The Gate drive voltage waveforms are not suitable for driving MOSFETS, also there are a number of other design problems.
E
EView attachment 313146

Hi E,
I really appreciate your effort !
If this conecpt is not feasible, what do you suggest to me.
You are free to use any other gate driver and update the circuit.
Thanks !

 

So basically I am struggling to design to gate driver switch flyback converter,

 

With M1 switched on there is a direct path between the supply positive and negative via D8.

Les.

 

The TLP2766A can only source/sink 10mA max, which is way too small to turn on MOSFETs rapidly if your switching frequency is 60kHz. You will need a dedicated gate-driver IC with a bootstrap arrangement to supply about 58V to the high-side gate. There are many examples of the use of gate drivers on the internet. Do a bit of Googling.
Is this a school/college project?

 

The TLP2766A can only source/sink 10mA max, which is way too small to turn on MOSFETs rapidly if your switching frequency is 60kHz. You will need a dedicated gate-driver IC with a bootstrap arrangement to supply about 58V to the high-side gate. There are many examples of the use of gate drivers on the internet. Do a bit of Googling.
Is this a school/college project?

hey...thanks for answer.
This is not college project.
Could you please share suggest some gate driver for dual switch flyback application application ?

 

Hey all,
Could anyone suggest the gate driver for dual switch flyback converter?
Thanks for help

 

I suggest you take a look at this before considering which driver to use.