Step down voltage from 36V to 12V for EV

[Assurena]

Hello ,

i have to design a step down circuit from 36V/48V to 12V that compatible for Electric Vehicle.
Where my circuit need to charge the 12V battery.
I am using this circuit

I need an opinion how to control all the MOSFET.
After done the simulation, i have failed to get the right result.
Thank you.

 

[crutschow]

Where did you get that circuit? It looks rather complicated.

Why not just use PWM and a single switch to control the voltage to the motor?

 

[Assurena]

I get it from the journal. As attached is where my project take part and how the circuit works.
I have to charge the 12V battery in Electric vehicle.



I have simulate the circuit and it failed.

 

[ronv]

What you want is a step down or buck regulator. They are often cheaper to buy than to build, but to know about that we would need to know what kind and size of battery and how fast you need to charge it.

 

[fernando_g]

Texas Instruments, Fairchild, STMicro, OnSemi, Intersil and others have buck regulator circuits that will be able to do exactly what you need.

Do you want to ACTUALLY build the circuit or just perform a simulation?

The Texas Instrumnts site has a powerful simulator, called Webench

 

[crutschow]

I still don't see where you got that circuit.