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  1. #1
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    dc dc converter 12v to 180v

    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 !
    -------------------------------------------
    ..the child bless thee and keep thee forever

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    Re: dc dc converter 12v to 180v

    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...


    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......
    Wading all day.....



    •   Alt4th September 2012, 18:42

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    Re: dc dc converter 12v to 180v

    aha, good idea to use the cascade voltage doubler! but is it going to handle around 15watts?
    -------------------------------------------
    ..the child bless thee and keep thee forever



    •   Alt4th September 2012, 19:06

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    Re: dc dc converter 12v to 180v

    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.
    Wading all day.....



    •   Alt4th September 2012, 19:30

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    Re: dc dc converter 12v to 180v

    good thank you!! do you know if i can use an ic?
    -------------------------------------------
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    Re: dc dc converter 12v to 180v

    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.


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    Re: dc dc converter 12v to 180v

    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.
    Wading all day.....



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    Re: dc dc converter 12v to 180v

    ok, i have some coils from dead psu. can i use those to manufacture an apropriate?
    -------------------------------------------
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    •   Alt5th September 2012, 14:48

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    Re: dc dc converter 12v to 180v

    Wading all day.....



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