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dc dc converter 12v to 180v

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thebadtall

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Hello !

I would like to make a dc dc converter ,(without to use coil or choke or something like that) in order to get the necessary voltage (180v )to run a "magic eye" tube, on a vu meter circuit. (and some nixie tubes on other circuit )

this circuit runs fine with back to back transformers and has a range of 150 to 250vdc, but i would like to know how i could replace those back to back transformers with a smps 12v/1(or 2) A and a dc dc circuit.
I need about 100ma !

thank you !
 

As I know, converting 12 v DC to 180 v DV would be very less efficient. Still only one Idea I am having right now is to first convert dc to ac by this...
89_1346780302.gif


And then use voltage multiplier circuit (atleast 15 diodes for 12v x 15 = 180v) like this...


again converting it into dc....


Hope you get any better idea......
 

aha, good idea to use the cascade voltage doubler! but is it going to handle around 15watts?
 

If you drive 15 watt, then calculation says current drawn will be ~83ma. Current drawn is very low and as the circuit seems to be, I hope it should work. Since it is less efficient, let consider its efficiency to be as less as 40%. Then the source should have the capacity of around 25W. (With 12v constant voltage, current = ~2.08 or 2A). So check your source is capable to give such current.
You can add one more diode to adjust the voltage drop by 15 diodes.

All rough calculations, so I advise not to go with this. Make your own calculation for better accuracy.
 

good thank you!! do you know if i can use an ic?
 

As it turns out, a voltage multiplier could be more trouble than it's worth.

This schematic is a Villard multiplier of several stages (enough to fill my screen width).



You must start with 12 VAC. (It will barely work with pulsed DC.)

It reaches 128 VDC output with a light load. It will require a few more stages to obtain your desired V.

The diodes and capacitors must handle bursts of over 1 A during each cycle.
 
Since you said you don't want to use coils or transformers, all other circuits will be complex and less efficient. I don't know any boost IC for 180V. All IC's known to me requires an external coil and are of low voltage output.
 

ok, i have some coils from dead psu. can i use those to manufacture an apropriate?
 

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