Hello,
I am designing a zeta converter using gate driver IC IR2110 in LTspice.
I have multi-phased it for current sharing across the switches.
The problem is my inductors L1 and L3. The power consumption of these two is very high.
I don't know what is causing it. Can someone please help me with it?
I have also attached the simulation file in the thread. Thank you.

 

Hello,

Should Vs not be connected to the other side of C1?
Now the gate voltage has no reference.

Bertus

 

Hello,

Should Vs not be connected to the other side of C1?
Now the gate voltage has no reference.

Bertus

I tried it, but that seems to not work.
The simulation goes creazy if the Vs is connected to the other end of the C1.

 

Hello,
I am designing a zeta converter using gate driver IC IR2110 in LTspice.
I have multi-phased it for current sharing across the switches.
The problem is my inductors L1 and L3. The power consumption of these two is very high.
I don't know what is causing it. Can someone please help me with it?
I have also attached the simulation file in the thread. Thank you.View attachment 341287View attachment 341288

Can't make sense of your circuit, You have effectively placed L1 & L3 directly in parallel to each other. Also whats the purpose of D1 & D3 & R2 & R9?

Zeta Documentation below
https://www.ti.com/lit/an/slyt372/slyt372.pdf?ts=1737882695478

 

Can't make sense of your circuit, You have effectively placed L1 & L3 directly in parallel to each other. Also whats the purpose of D1 & D3 & R2 & R9?

Zeta Documentation below
https://www.ti.com/lit/an/slyt372/slyt372.pdf?ts=1737882695478

Got the Idea from this link:
https://ww1.microchip.com/downloads.../ApplicationNotes/ApplicationNotes/01467A.pdf
For the D1, D3, R2 and R9, I don't remember where I read it but, it was for DC stabilization or something like that. I don't remember.
I don't know why my Inductors are consuming this much power.

 

Got the Idea from this link:
https://ww1.microchip.com/downloads.../ApplicationNotes/ApplicationNotes/01467A.pdf
For the D1, D3, R2 and R9, I don't remember where I read it but, it was for DC stabilization or something like that. I don't remember.
I don't know why my Inductors are consuming this much power.

But thats not what you've done. They are effectively creating a synchronous rectification and still only use 2 chokes. You are using 3 chokes. If i was you i'd start on the Zeta converter in the document i linked with 2 chokes and a single switch then once working look at bringing in the synchronous rectifier to replace the diode.

 

But thats not what you've done. They are effectively creating a synchronous rectification and still only use 2 chokes. You are using 3 chokes. If i was you i'd start on the Zeta converter in the document i linked with 2 chokes and a single switch then once working look at bringing in the synchronous rectifier to replace the diode.

Yes I am using 3 chokes.
Actually, the first two chokes are parallel. I did this to lower the current stress from the switches. Other then that it should be a basic zeta converter.
I have also tried the simulation after removing the diodes and the resistors but the result doesn’t seem to be affected.
I have also done the simulation with ideal voltage controlled switches without using gate drivers. In that case the simulation was perfect.
But after adding gate driver, I am facing this inductor issue.

 

What voltage and current are you trying to create?

 

I don't think you can drive a zeta converter with a IR2110, because the source of the power FET has to go below 0V. I think it needs a P-channel FET.
This Texas Instruments application note says that the voltage across the first inductor is Vout when the MOSFET is off.