Joule Thief

[xee2]

Hi slayer007

Nice to hear from you again. I would suspect that with that great big battery the LED and JT are going to run a long, long, long time.

[resonanceman]

Hi Gary:
   In the search for what is going on, I too have run into the realization
that this "must" be a resonance thing. If you look into natures clock work
you will find resonance at work. You may have to look at the really big
picture to see it but it is there.
   Now take a coil/cap pair, at only one spot is it resonant. Your charge
only happens when your circuit is in resonance. The key is to find a way
to add a feed back to tell the main circuit to adjust to keep it there.
   I have been on a quest to learn how to wind a "proper" coil. Not as easy
as you would think. Many factors go into the mix. Wire size is really not
a really important factor other than how much amps you wish to carry in
it. Things like C to L ratio, diameter to length and spaceing of the winds
all have a very high effect on its outcome.
   I have chosen to set the frequency and then adjust all these factors to
achieve that result. Number 14 solid wire should be enough to get started
with.

thaelin



>Quote from Gary<

I am hoping  that the   timer is  more stable than the JT

I can get  a  JT to self charge  with enough  inductors  .
The problem is   I can't get it to keep  charging .
I  am pretty sure  it is a resonance thing .
It  charges well  when  it is in resonance  .........but  as the battery  voltage changes  ....it drifts out of  resonance and  stops charging .

I  am hoping that   with  a chip I can  set  the frequency  and it will  stay  at least close to that  frequency  over a wide voltage range .
If so  .......It should  be much easier to keep it in self change mode .

gary

Thaelin

It looks like  we are thinking along similar lines .



IST

I  agree that  a  good  sized  battery  would help .

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Here is my  plan .........maybe    one of you can  get it done faster than I can



I do not think that  a fancy  feedback system  is needed .
I plan on   using  a  lead acid battery .   I am  posting a picture of the  unit  I am  modifying .

The  voltage  of this  battery when  fully  charged  can be as high  as 14.5 V
It is  supposed  to  be  good at deep discharge but  in general  under 10.5 V  is damaging  for  lead acid  batterys .
So ....  I need to make  a JT like  circuit  that will  be stable  over a range of  4 V

I plan on   using  2  windings  for the charger .......the  first one  will  be  tuned  to  about  13 V  ( using  a bridge and cap . )   
This one will  be as large as possible  and  still  keep it in self charge mode .
The  other  secondary  will  be  slightly higher  voltage  and  lower power .  ( maybe  about 16 V )
This   winding   will in effect  be a  trickle  charger / reconditioner
It  will be rectified and  feed  the battery a   pulsed DC  just  a bit over  the  normal highest   charge voltage .
This   winding  has to  be  limited  with a cap  to  provide  a low  enough   current  to  never   cause any  bubbles in the  electrolyte .   With  60 Hz power   a 1uF cap would  work  for this size  battery ........with high  frequency  a smaller cap will  be needed.,,



The   first  winding  will  simply sit there ...if the  battery is  fully  charged ......
If the  battery  drops  below the  voltage in the  bridge/ cap   it  will start  charging ...
There should  be little or no  affect  on the circuit  because of  the charging .......because the   bridge /cap  is  always  held  at  approximately  the same   voltage .



I chose this  unit  to  modify because it has   a good sized battery   ( 12 Ah) .......a  circuit  with LEDs  to  show charge status .  ......  several   connection options including  a cigarette  lighter  with a 15 A breaker......  and  jumper cable  clamps  with a switch .
It also has  a  light ...... right now  it  has a bulb like  a flashlight ... I plan on   replacing  it with  a  LED array ........ 
It has  space available in each end (by the  battery)  for  electronics  that is  close to  1 x 4 x 4



When  this is  finished  it should  be able  to power quite a few things .
With  a  JT  I was able  to  self  charge   while  running  90 LEDs .
Using higher voltage  and   a PWM  I hope to  double this   output ......maybe more .


After this   project   the next thing is  moving  up to a  car battery ........using an inverter  to take off power .


After  the car battery ......  setting  a large inverter  up with several car batterys  .... we should  be able to run stuff like   air conditioners .



gary

[slayer007]

Hi slayer007

Nice to hear from you again. I would suspect that with that great big battery the LED and JT are going to run a long, long, long time.

Hello Xee2

Did you notice in the video I'm only using the positive side of the battery.
The capacitor is getting it's power from the AV plug on the positive post and the antenna groung from the metal shelf.


The negitive side of the battery is only going to an earth ground.

[innovation_station]

verry nice slayer007

verry nice ...  can you do a drawing ...

that would be awesome...



gary great idea ...  i like your unit...   

this is just wild to see it !!   here and now in 3D EARTH REALITY!!

ist!

[slayer007]

verry nice slayer007

verry nice ...  can you do a drawing ...

that would be awesome...



gary great idea ...  i like your unit...   

this is just wild to see it !!   here and now in 3D EARTH REALITY!!

ist!

Thank You IST

I sure can I have a few things to do this afternoon.But I will make one tonight.