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Topic: high voltage power supply for nixie tubes (Read 2630 times) previous topic - next topic

putyn

hey , im trying to find a design for a high voltage power supply to power two nixie in-13, tubes are powered at 140V max  and the current requirement its about 5mA per tube   i found this design http://www.ladyada.net/library/diyboostcalc.html but im not really sure if its suited for my requirements

ive found a lot of designs using an 555 timer (or a dedicated ic from maxim)  but i want to use an atmega8 to driver this circuit
now the question is would that design allow me to produce 120-130V @ 10-15 mA ? and would be possible to implement some kinda of feedback circuit so i can keep an eye on the voltage output ?

any suggestion its appreciated

CrossRoads

There are internet designs that use disposable flash cameras to make the high voltage. Is that something you can obtain?

Or were you thinking something wallwart powered?
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

putyn

it will be powered by 9-12V from a dc wallwart , i have found this http://www.ogilumen.com/nixie-tube-power-supply-p-91.html but its too pricey for my budget

CrossRoads

Can you make this?
http://www.electricstuff.co.uk/nixpsu.html
Found it buried in here
http://www.derivedlogic.com/Nixie%20Stuff/nixiestuff.html
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Zapro

I would VERY much recommend this design. It's almost impossible to do it wrong, and it works every time. Even on a breadboard.

https://skydrive.live.com/?cid=f9db37b8211ce831&sc=documents&id=F9DB37B8211CE831%21119#cid=F9DB37B8211CE831&id=F9DB37B8211CE831%211426&sc=documents

If you can figure out EAGLE cad, i have made a layout here, ready to use: http://zapro.dk/public/Nixie_SMPS_V1_5/

// Per.

CrossRoads

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

putyn

both suggested designs look good but i want something where i could use the atmega8 to control the circuit , the schematic ive posted works but im not sure if it can produce 120V to power the nixie tubes

CrossRoads

The page you started with has calculator for that will show the caps, inductors, and switching information needed for the desired switching frequency (such as 31250), output voltage, current, and allowable ripple on the output voltage.

Go plug some numbers in the calculator seems to work.
For example, 31250 using Timer 1
http://www.arduino.cc/playground/Main/TimerPWMCheatsheet,
Min/Max 9V,
110-130 output,
20mA,
0.1V Ripple on the voltage,

yields inductor size, cap size, diode required, etc.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

putyn

yeah but my question was - is that design reliable to generate 120V ?

CrossRoads

The topology looks similar to the 555 design in reply #4.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

putyn

until i decide which design im going to use im gone simulate it inside proteus - probably that will give me some ideas on how reliable the circuit is
thanks for the suggestions so far - ill post my finding once if finish testing and some code/schematic once i complete the circuit

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