building my own uc3843 boost converter

Thread Starter

Momentory

Joined Sep 4, 2022
101
I am trying to make a boost converter using uc3843 with the following

- the input voltage = 12v
- the input current = 4A
- the output i want = range 150v to 235v
- the current output = 0.5A

i will use mosfet irf840 and diode UF4007

did did my design according to texas instrument pdf for boost converter
https://www.ti.com/lit/an/slva372d/slva372d.pdf

Capture.JPG

calculated :

- max duty cycle = 1- (V in min / V out max)* η
i assumed η = 80%

- I switch = I coil = I diode = ΔI/2 + I out max/ 1- D
(ΔI/2 = I load min = 10% of the I max = 0.05A)

inductor (L) = V in * (V out max - V in min) / ΔI*Fs*V out)
Fs = 100 KHz
ΔI = 2* I load min

i add R7 to the schematic just to make the circuit CCM boost converter ( i am not sure about its value yet!)

what do you think about this boost converter will work?
 

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Last edited:

Papabravo

Joined Feb 24, 2006
20,996
A boost converter with that boost ratio will be impractical and difficult to control. A typical design would be limited to a boost ratio of 5-6 and you are far in excess of that.

On top of that your input power is:

12V * 4A = 48 Watts

Output power is:

150V @ 0.5 A = 75 Watts

If you can make this happen, you will win a Nobel prize.

I'm going to hazard a guess and say this will NOT be happening.
 

Thread Starter

Momentory

Joined Sep 4, 2022
101
A boost converter with that boost ratio will be impractical and difficult to control. A typical design would be limited to a boost ratio of 5-6 and you are far in excess of that.

On top of that your input power is:

12V * 4A = 48 Watts

Output power is:

150V @ 0.5 A = 75 Watts

If you can make this happen, you will win a Nobel prize.

I'm going to hazard a guess and say this will NOT be happening.
You are right, i do not know how i ignored this!!
I will try to increase the input to 24v - 5A
 
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