using inductor in flyback converter for nixie power supply

H

HTAluvBeBeo

New Member

• Apr 17, 2009

• #1

using inductor in boost converter for nixie power supply

Hi all, my friends

I am doing a simple power supply for nixie tube base on this schematic

**broken link removed**

But I can not find 100uH/1A in stock

I only found 330uH inductor in the shop, pitty me

So, could I replace 100uH with 330uH to have this 12V to 200V DC/DC converter worked

Thank you all for answering my noob question and have a great day !

PS: here is my modify, correct my if I am wrong, please

 

Attachments

• PAGE1.pdf

  12 KB · Views: 1,048

Last edited: Apr 17, 2009

S

smanches

New Member

• Apr 17, 2009

• #2

If you increase the inductance of the coil, you will have to decrease the switching frequency to make up for it. You will also have to increase the output capacitors to make up for the extra ripple.

Frequency and inductance are directly proportional, so if you increase your inductance by 330 / 100 = 3.3x, you have to decrease your switching frequency by the same amount.

FYI, that's a boost converter, not a flyback.

 

Last edited: Apr 17, 2009

H

HTAluvBeBeo

New Member

• Apr 18, 2009

• #3

Flyback Converters for Dummies

according to things I read from the article above, If I want to use 330uH instead of 100uH I could change the C2 222 to 332

**broken link removed**


Is that right?

 

ericgibbs

Well-Known Member

Most Helpful Member

• Apr 18, 2009

• #4

Is it possible to remove some turns from the 330uH inductor, say down to 100uH.??

 

H

HTAluvBeBeo

New Member

• Apr 18, 2009

• #5

I did not have any machine to measure the inductor I am amateur (noob )

 

picasm

Member

• Apr 18, 2009

• #6

There are many 555 nixie supply variants around and here is one that uses a 330uH coil.
Switching Power Supply

If you just lower the frequency of your design it should work with the same HV output smoothing capacitor as long as you only need about 6-8mA max to drive your tubes.
The 555 HV power supply design is not very efficient for use with heavy loads, just a cheap solution for powering up to 6 small nixie tubes.

 

H

HTAluvBeBeo

New Member

• Apr 18, 2009

• #7

yep, thank you all, here is the result

I will come with MC34063 next weekend fore more efficient.

 

Attachments

• IMG_0076 (Medium).JPG

  51.5 KB · Views: 2,123
• IMG_0077.JPG

  3.5 MB · Views: 1,234
• IMG_0081 (Medium).JPG

  59.2 KB · Views: 931