Storing Cookies (See : http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm ) help us to bring you our services at overunity.com . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
https://overunity.com/5553/privacy-policy/
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding

User Menu

Custom Search

Author Topic: Second Stage Joule Thief Circuits  (Read 476913 times)

Groundloop

  • TPU-Elite
  • Hero Member
  • *******
  • Posts: 1736
Re: Second Stage Joule Thief Circuits
« Reply #315 on: November 29, 2009, 02:03:00 PM »
All,

Today I have started to test this circuit.

The circuit works. I use a 10.000uF electrolytic capacitor for
the test. The capacitor charges up and when reached a preset
voltage, discharges through the hexfet transistor and into
my load.

I have not tested the battery feed back yet because I do not have
the 3,6 Volt zener.

More testing is needed before this circuit can be used in a JT setup.

There is one more issue I need to solve. Sometimes the TIC106 stays on
because the current through the relay is just high enough to keep the SCR
on even if the voltage in the cap has fallen to 0,74 Volt. Trying to solve
that problem now.

I could not modify the drawing on one page back so I added the newest circuit here.

[EDIT-1] OK, the circuit as posted here does work. But the discharge voltage threshold is 10,7 Volt.
             So, I need to get that threshold down to 5,1 volt. Working on that now.

[EDIT-2] Can't get the threshold right. The mosfet needs a higher than 5 volt to fully switch on.
             Will not work with the JT as it is now. I need to take a break and rethink this circuit.

Alex.
« Last Edit: November 29, 2009, 08:42:03 PM by Groundloop »

mscoffman

  • Hero Member
  • *****
  • Posts: 1377
Re: Second Stage Joule Thief Circuits
« Reply #316 on: November 29, 2009, 06:36:02 PM »
All,

There is one more issue I need to solve. Sometimes the TIC106 stays on
because the current through the relay is just high enough to keep the SCR
on even if the voltage in the cap has fallen to 0,74 Volt. Trying to solve
that problem now.


Alex.

Sometimes one can make use of a transistor switch that can support
a current flow when it is on but not switch that total current flow. When
the current gets low then switch the transistor entirely off then on
again to help out the SCR to switch off.

:S:MarkSCoffman

Groundloop

  • TPU-Elite
  • Hero Member
  • *******
  • Posts: 1736
Re: Second Stage Joule Thief Circuits
« Reply #317 on: November 29, 2009, 07:32:03 PM »
@mscoffman,

Thanks for the tip.

The total current flow through the SCR and the relay is low.
The BS170 can handle the current.

Groundloop.

guruji

  • Sr. Member
  • ****
  • Posts: 470
    • http://andyborg.tripod.com
Re: Second Stage Joule Thief Circuits
« Reply #318 on: November 29, 2009, 08:51:22 PM »
All,

Today I have started to test this circuit.

The circuit works. I use a 10.000uF electrolytic capacitor for
the test. The capacitor charges up and when reached a preset
voltage, discharges through the hexfet transistor and into
my load.

I have not tested the battery feed back yet because I do not have
the 3,6 Volt zener.

More testing is needed before this circuit can be used in a JT setup.

There is one more issue I need to solve. Sometimes the TIC106 stays on
because the current through the relay is just high enough to keep the SCR
on even if the voltage in the cap has fallen to 0,74 Volt. Trying to solve
that problem now.

I could not modify the drawing on one page back so I added the newest circuit here.

[EDIT-1] OK, the circuit as posted here does work. But the discharge voltage threshold is 10,7 Volt.
             So, I need to get that threshold down to 5,1 volt. Working on that now.

[EDIT-2] Can't get the threshold right. The mosfet needs a higher than 5 volt to fully switch on.
             Will not work with the JT as it is now. I need to take a break and rethink this circuit.

Alex.


Hi Groundloop thanks for the schematic. What are you trying to achieve by this circuit more amps?
And how much are you aiming? Would it be possible that one use small caps to light a heater as gadgetmall did?
Thanks




Groundloop

  • TPU-Elite
  • Hero Member
  • *******
  • Posts: 1736
Re: Second Stage Joule Thief Circuits
« Reply #319 on: November 29, 2009, 09:14:57 PM »
@guruji,

I'm trying to build a circuit that will discharge a big battery capacitor to a load when the
capacitor has reached a preset voltage level. The circuit should also feed back some power
from the battcap to the input AA battery.

Alex.

guruji

  • Sr. Member
  • ****
  • Posts: 470
    • http://andyborg.tripod.com
Re: Second Stage Joule Thief Circuits
« Reply #320 on: November 29, 2009, 10:00:23 PM »
@guruji,

I'm trying to build a circuit that will discharge a big battery capacitor to a load when the
capacitor has reached a preset voltage level. The circuit should also feed back some power
from the battcap to the input AA battery.

Alex.

Hi Groundloop first of all sorry about this scheamtic turned sideways try to see it ;anyway by print it. I don't know if this circuit would be of any help to what you've building.
The text says that when the cap is full it is drained to the battery.
Thanks

Pirate88179

  • elite_member
  • Hero Member
  • ******
  • Posts: 8366
Re: Second Stage Joule Thief Circuits
« Reply #321 on: November 29, 2009, 10:01:36 PM »
Alex:

Wow, you are really working hard on that circuit.  Great work man.

I seem to remember a youtube video a while back done by THEDAFTMAN where he came up with a low power switching circuit to swap out the run and charge batteries from his Bedini when they were full.  I think it was pretty efficient but, I know he had more power to work with.  If you think it might help and possibly give you some ideas I can locate it and post a link here.

Keep up your great work on this.  I only wish I knew enough to be of more help.

Bill

topothemtn

  • Newbie
  • *
  • Posts: 26
Re: Second Stage Joule Thief Circuits
« Reply #322 on: November 30, 2009, 01:01:06 AM »
Welcome back Bill. So good to see you here again. You do such a good job we really would have missed your smiling face.

Dick

Groundloop

  • TPU-Elite
  • Hero Member
  • *******
  • Posts: 1736
Re: Second Stage Joule Thief Circuits
« Reply #323 on: November 30, 2009, 01:08:40 AM »
@guruji,

Thank you for posting that circuit drawing. Yes I have tried that circuit. It works
good for all capacitor voltages above 65 Volt. What I'm trying to do is to switch
2,6 Volt. I'm also trying to make a switch that uses no power when inactive.

Bill,

Good to see you back. :-) I have been working on this circuit two day now and need a rest.
I have some ideas and will be back later on.

Alex.

gadgetmall

  • elite_member
  • Hero Member
  • ******
  • Posts: 1733
    • Alternative Energy
Re: Second Stage Joule Thief Circuits
« Reply #324 on: November 30, 2009, 02:55:38 AM »
Thank you Alex . Get some rest . I am Trying to make a better Jt for faster Charging .
Get some rest .
Albert

Pirate88179

  • elite_member
  • Hero Member
  • ******
  • Posts: 8366
Re: Second Stage Joule Thief Circuits
« Reply #325 on: November 30, 2009, 03:45:38 AM »
Topothemtn:

Thank you, I appreciate that.

Groundloop:

Thank you too.  You will figure out that circuit, I have faith in you and your abilities.

Bill

jadaro2600

  • Hero Member
  • *****
  • Posts: 1257
Re: Second Stage Joule Thief Circuits
« Reply #326 on: November 30, 2009, 04:07:53 AM »
IST, what exactly are your sun circles supposed to do anyway?

Gadgetmall, I look forward to your casting!

innovation_station

  • Hero Member
  • *****
  • Posts: 5134
Re: Second Stage Joule Thief Circuits
« Reply #327 on: November 30, 2009, 04:16:39 AM »
there led gro lights spectrum tuneable ...  and to be designed with sg ...

sg or is that gs ..

any way 24 modules .. maybe 2400 leds ..

this wil be tuneable for all stages of plant growth and it can accelerate it should i choose that design ..

if i can get everything in place ...  1000's are sold .. instantally ...
for gorwing things......  they are advanced ... things..

w

this is the base that i choose to build it on .. i will use jt's probally powered from a ubc (ultra boost cap) charged from 1 ring ..  the bost cap will go to a voltage devider to drop it to 3 feeds within jt working range...  i could drop a gadget solar under it to charge  ;)

it is never a question of can i build things ... it is a question of whats the budget....   i have some not all materials payed for to built 1 or 2 but i can only go so fast with the limited resources i have

and i wanted a cube for now .. cuz im sure there in demand too... so i put it priorty ..

nievesoliveras

  • elite_member
  • Hero Member
  • ******
  • Posts: 1996
Re: Second Stage Joule Thief Circuits
« Reply #328 on: November 30, 2009, 08:57:02 PM »
@groundloop

What do you think about this circuit?
Could it be added to yours in order to get the feedback?

Jesus

gadgetmall

  • elite_member
  • Hero Member
  • ******
  • Posts: 1733
    • Alternative Energy
Re: Second Stage Joule Thief Circuits
« Reply #329 on: November 30, 2009, 10:40:40 PM »
@groundloop

What do you think about this circuit?
Could it be added to yours in order to get the feedback?

Jesus
@Jesus . We are trying to adapt this circuit to a JT  for the prize . Can this circuit be adapted to a normal JT ? . The purpose Of Alex's Circuits are to monitor the run battery and top it off what the Charge Bcap is above the battery in both volts and amps. . There are other ways to charge these bcaps . If you could and have built the circuit you describe could you measure the volts and current on the out put . the cap is basically a dead short in any circuit so an amp meter will represent the bcap as it is also a short . .

Albert