Which voltage multiplication topology is more efficient/practical??

4 replies [Last post]
MoRo1212
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Joined: 07/02/2009
Points: 5

Hello forum members,

I am deciding whether a diode/capacitor CW circuit,or a step-up

power hand-wound step-up transformer is easier,and more

practical;I am only needing at most a voltage multiplier for my

electric pmdc powered bike trailer with dual curry brushed

motors-I have magnet wire,T200 toroid,fiberglass tape,some

electrolytic caps,hi amp diodes(Schottky,FAST,hi-amp) so either way it would be practical

to make a decent working voltage multiplier!

I basically want to know which "vm" circuits that the members have

used with good results,and what circuit is more

efficient/practical??

btw,I have uploaded a few examples of voltage multiplier circuits

similar to what I will like to try,although the sytep transformer

core I will be using is a toroid design,and not a split-bobbin/E core

design!!

Thanks in advance for a reply!

AttachmentSize
comp1.jpg18.46 KB
step_up_transformer.gif30.65 KB
comp2.gif15.44 KB

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colin9876
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Joined: 10/23/2008
Points: 289
Re: Which voltage multiplication topology is more ...

I would like to know this as well, as I want to use one 3.3v 100Amhr Lifepo4 cell scaled up to 24v volts to run a scooter.
Whats the most efficient way to convert this voltage?

kito
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Joined: 09/21/2008
Points: 35
Re: Which voltage multiplication topology is more ...

Transformers are not typically what is used to up convert a DC source.
I would recommend using a DC2DC controller ref design from a semi chip company like linear, analog, or whatever you fancy.
They typically employ an inductor (no hand wound stuff) /w FET switches and a controller to jack the voltage up.
Or look at companies that sell modules which have an entire switching supply encapsulated in a box.
However it sounds like this is a project to learn, so so maybe you like doing hand wound transformers route.

wookey
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Joined: 04/08/2009
Points: 90
Re: Which voltage multiplication topology is more ...

This page has an EV voltage step-up design: http://www.re-voltage.eu/electronics.html

The author may be able to supply an actual device or more details. He posts on Endless Sphere as Tiberius

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Wookey
Sakura s50 (Efun A)

amberwolf
amberwolf's picture
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Joined: 12/31/2007
Points: 35
Re: Which voltage multiplication topology is more ...

In reference to the last request, there is also a yahoo group called "switchmode" about an SMPS design for a bike motor controller that does this--steps up from a lower voltage higher-current source to a higher-voltage lower-current source. The designs are available on that group in the Files section.

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Michael Elliott
Cybernetic Necromancers, Discorporated
Phoenix, AZ
Watch me build an electric-assisted recumbent bike from recycled junk:
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