DC boost converter max power ?

[bianchi77]

Re: DC boost converter max power ?

One question : does f pole equal to f switch ?

[bianchi77]

Re: DC boost converter max power ?

Why exactly do you want / need opto feedback?

Compensating the TL431 is only gonna be one extra headache, which i don't think you really want, considering all the previous adventures...

I know that and I hate that headache, because it's good for learning and understanding but not earning at all..
Had you done any opto and TL431 before ?

[bianchi77]

Re: DC boost converter max power ?

Okay, I only want to know how that coupler and TL431 work, is that the right circuit ? more or less ?

It will relate with control system loop with feedback, bode plot ,pole, zero, aha so that's the way it works, return again to the math

[bianchi77]

Re: DC boost converter max power ?

I got 207V , RL = 2K and f = 13.14 KHz, it's less efficient but it does the job..
and abit noisy with low frequency

[bianchi77]

Re: DC boost converter max power ?

Okay, I only want to know how that coupler and TL431 work, is that the right circuit ? more or less ?

[Khron]

Re: DC boost converter max power ?

Why exactly do you want / need opto feedback?

Compensating the TL431 is only gonna be one extra headache, which i don't think you really want, considering all the previous adventures...

[bianchi77]

Re: DC boost converter max power ?

can it be :

[bianchi77]

Re: DC boost converter max power ?

@budm, thanks for the book

[bianchi77]

Re: DC boost converter max power ?

How can I add TL 431 and optocoupler for feedback?
Inspiration :
http://u.dianyuan.com/bbs/u/68/2457951218099004.gif

but not sure if it's the right way modifying my voltage divider..

[budm]

Re: DC boost converter max power ?

http://www.learnabout-electronics.org/PSU/psu32.php

Read: Boost converter Operation/example.
You should get a generator to drive the MOSFET and vary the ON/OFF time to see the effect.

[bianchi77]

Re: DC boost converter max power ?

Those designs are basically has the same way with 555...
currently I'm using 700uH hand made inductor but I can't increase voltage anymore, stack on 185V on 5K RL,
I'm not sure, I will get a better result with those chips but I will give a try

[Khron]

Re: DC boost converter max power ?

... And how is that so different about the circuit in post #105?

http://darkside.higashino.jp/resourc...se/chopper.gif

Wow, another PNP driving a FET.

The other two circuits, from post #49:

https://www.birdandgua.net/bird/wp-c...05/image39.png
http://www.mikrocontroller.net/attac..._180V_25mA.png

The same basic topology. Coincidence?

PS: You can't have feedback without a resistive divider from the output, so... I'm not really sure where your question comes from, or what it's about.

You have at least THREE (now FOUR, with this last one you found) designs ready-made for you. What more do you want???

[bianchi77]

Re: DC boost converter max power ?

thanks for all the infos, this one is similar :
http://radioactiveathome.org/en/hard...r-with-a-choke

that's PNP transistor functioning as a follower for making FET switching faster

[bianchi77]

Re: DC boost converter max power ?

Is it possible only using 1 FET and resistor voltage divider for making MC34063 doing the step up ? if more than that, what's the different with 555, I got 220V with RL = 6K now..
my inductor is not perfect that's why the output is not good, a lot of flux loss
I have 8 inductors in series for 380 uH value.

[bianchi77]

Re: DC boost converter max power ?

Yup I don't understand your post

[Khron]

Re: DC boost converter max power ?

Why are you asking ?

I'm asking because some of your posts are difficult to understand / easy to misunderstand. And there's a possibility you haven't completely understood some of our (other people's) posts.

[bianchi77]

Re: DC boost converter max power ?

I'll read later on...too many informations and making all more complicated

[Khron]

Re: DC boost converter max power ?

Page 17 in the ST datasheet shows what's called a "flyback converter" and it indeed uses a transformer (or, technically, a coupled inductor).

"too many informations and making the whole point complicated..."

So, you DON'T want EVERY step that's needed to create and calculate the circuit you need, shown and explained to you. But you "want to make something simple", by magic? Just wishing it into reality? Or do you expect any of us to present you with a ready-made circuit?

Or.. you're really too lazy to even look into / use ONE simple equation, to figure out two resistor values? Seriously?..

[bianchi77]

Re: DC boost converter max power ?

You're not a native Australian, are you? I'm only asking because it "feels" like english isn't your first language.

Why are you asking ?

[bianchi77]

Re: DC boost converter max power ?

Yes I don't understand MC34063 works, it's maximum 40V output and my target is 240V
ST datasheet page 17


and it's using transformer, making it more complicated, I want to make similar with 555...

I haven't read that yet...too many informations and making the whole point complicated...
I want to make something simple..

https://cdn.badcaps-static.com/pdfs/...18f4bb5c06.pdf - page 12, right column, section 9.
9. The nominal output voltage is programmed by the
R1, R2 divider.
Vout 1.25
1
R2
R1
A standard 5% tolerance, 2.2 k resistor was selected
for R1 so that the divider current is about 500 mA.
R1
1.25
50010–6
2500 , use2.2k
R2 R1
Vout
Then 1.25 1
2200
28
1.251
47, 080 , use47k