Which voltage multiplication topology is more efficient/practical??

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Last seen: 14 years 2 months ago
Joined: Thursday, July 2, 2009 - 19:15
Points: 5
Which voltage multiplication topology is more efficient/practical??

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


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


Thanks in advance for a reply!

Image icon comp1.jpg18.46 KB
Image icon step_up_transformer.gif30.65 KB
Image icon comp2.gif15.44 KB
Last seen: 11 years 10 months ago
Joined: Thursday, October 23, 2008 - 11:37
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?

Last seen: 5 years 4 months ago
Joined: Sunday, September 21, 2008 - 05:22
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.

Last seen: 11 years 7 months ago
Joined: Wednesday, April 8, 2009 - 06:12
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

Sakura s50 (Efun A)

amberwolf's picture
Last seen: 7 years 11 months ago
Joined: Monday, December 31, 2007 - 03:19
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.

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

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