Voltage Step up question.

[Chuck252]

I have been working on getting the voltage up in my cell. I know you can hook batteries together and get it done that way.

I thought that you could also use a transformer on AC or pulsed power to increase voltage. So I wrapped a toroid ( see below) with 24ga wire on both the primary and secondary. The primary has 10 turns, and the secondary has 50 turns.

It doesn't seem to do anything though, and I need some tips on how to get it running, or why it doesn't work etc...

I have the Chapp PWM with a 12v 2.5a input which goes into the toroid as the primary. The secondary doesn't show any voltage at all. I have flipped the polarity and still nothing.

What am I doing wrong?

[kentoot]

Hi Chuck,

It's good to see that you have the basic components in place, such as the 12v power supply, PWM & the toroid. But I think you need more wire turns, maybe primary 100 turns and secondary 500 turns. While the ratio is the same, the increased no. of turns will allow more energy to be transfered. Also I hope you have some sort of over current protection or current limiter in there, cause when the primary saturates, there will be huge current flowing. If you only have 10 turns, the primary will saturate very fast, and after that the primary will become a pure resistor. After saturation, if your 10 turns ohmic value is 0.1 ohm, then the current would be 12v / 0.1 ohm = 120 A. Well, if you don't have any current protection, most likely the PWM will "Rest In Peace" first. I hope this is not the case.

So try to increase the no. of turns to increase the energy transfer and slow down the saturation. Also to avoid saturation current, please try first with small ON duty cycle. Any sign of excessive current, try to reduce the ON duty cycle. If your PWM doesn't allow duty cycle adjustment, try first with higher frequency, so the ON time is shorter.

[keithturtle]

That would be my approach, cuz there ain't enough field getting up in the primary.   No first hand experience with that one yet; jes an observation from what I've read.

Turtle

[Moab]

not enough turns. youll need like 400 on 2ndary just my .02.nd your chapp pwm wont push this much ,Moab

[popeye68]

Hi Chuck ,

your transformer will probably only work on high frequency's of  >20.000hz


Some info and calculators :
http://www.bcae1.com/trnsfrmr.htm