Bedini Solid State Oscillators

[sucahyo]

Hi sucahyo, 3055 is a technology which I widely used in my high school time experiments - 70'. There are many bipolar transistors today which will perform better. As I said before, I have tried different ones with various results. We need a perfect switch and a fast one too. I have a few hybrids, having combined best characteristics of bipolar and MOS technology, which I would love to try it. In this particular circuit I don't see great advantage of MOSFET over SCR but I believe they would be beneficial in others. Of course, I may be wrong


Vtech

Ok. It may help the switch too if it triggered with something faster than 555 too, just like the difference of my one transistor and two transistor circuit.

[sucahyo]

Performance of new circuit:
- output current = 400mA
- output voltage without load = 370V
- charge at +0.1V above battery voltage for two nicad in series.
- do not make the battery hot
- charge 1000mAh under an hour, much slower than previous one transistor version but has less surface charging property.

The circuit is now closer to Bedini standard mentioned by Aaron where the HV output should reach 400V.

YouTube - New circuit performance, 370V charging two nicad

[blackchisel97]

My latest test setup of Solid State Bedini charger

and scope shot



Vtech

[blackchisel97]

And one of my small SSG's charging 14.4V battery pack.



This circuit works very well with AA's, 6F22's from my DMM's, small SLA's and non rechargeable alkalines. Second coil isn't connected, just sits on adjustable core.


Vtech

[SkyWatcher]

Hi folks, very cool pics blackchisel, very colorful. That's great, getting some practical use out of the technology charging a drill battery and extending its physical life. I myself went back to the 555 timer to pulse my coil to charge batteries because as I tested that circuit more, it was heating up the transistor way too much for my liking. I wish I could figure out why these self oscillators are heating up my transistors and fix it. Anyway nice setups there and thanks for the pics, I like colorful pics.
peace love light
Tyson

[blackchisel97]

Hi Tyson, thank you for the kind comment. It seems that kids "used" my camera. It's working strange and out of focus

I wish I could figure out why these self oscillators are heating up my transistors
I found that duty cycle may be responsible for heating up transistors. Also, you can try to slightly increase base resistance.


Vtech

[sucahyo]

This circuit works very well with AA's, 6F22's from my DMM's, small SLA's and non rechargeable alkalines. Second coil isn't connected, just sits on adjustable core.

Nice setup. I guess the rodin coil is not suitable for charging seeing it being stored. What kind of alkaline brand that you try to charge? Mine (ABC's alkaline) do not store current and only store voltage.

[blackchisel97]

Alkaline batts.

Hi sucahyo. I did experiment with few. I was harvesting parts (mainly capacitors) from disposable cameras and most of them have still good AA's/AAA's. They were Fuji, Kodak, Phillips, Rayovac among others. I tried with few weaker and I was able to use them (in my toothbrush) for couple of weeks. If you overcharge them, they may explode since they're not designed to be recharged. Some don't work at all but they're free anyhow
This week I'll make another J.B circuit, similar to the last one but not self oscillating. I'll use a rotor but keep cap pulser. I have limited means to make decent mechanical setup at the moment but I enjoy them more than solid state. I also want to transform my pendulum into something funny and I have an idea


Vtech

[pvar06]

Hi Praveen,

If we need to have 10-12 cycles to revive one battery then I dont think this is a commercial viable project. This is good for people like us, who hooked on to some thing and do research and the open source. But this is certainly not going to change anything.
IMO it will, for every person who will be able to make such circuit for himself or for the nice neighbor. Non rechargeable/rechargeable batteries are a huge industry with couple billion dollars profit annually. Imagine for yourself, that you don't have to buy anymore AA,AAA, C,D, etc.
-That you can keep your car battery for longer than normal.

I apologize for a long post but I believe this has a potential for every person. BTW, we all have friends. Show the what can be done. This is far more interesting than any TV show


Vtech

Hi Vtech,

Nothing to apologize, in fact every post is informative.

My main reason for raising the issue was because of lot of faliure in replicating the page46 or similar design. In most of testing [page46 or Jetijs] I found the battery is improving but at a very slower pace, so i was just thinking about using some assisting material to make it happen fast.

Any ways I am still on to this project .... haha.

Regards

Praveen

[pvar06]

Tip122

Hi,

In the process of achiving some powerful spikes [over 200 volts with input current of 1-1.5 Amps]. I have tested various transistors like KSE13009, 3055 etc.

In this process I has just installed the TIP122 [some old stock was lying with me] on the Bedini Page46 schematic [only difference that installed 100k pot in place of 51k fix resistor]. I have observed that suddently the circuit draw increased to 1.5-2 amps. But at the same time at the output side there was no voltage and no current.

I got the doubt that there must be some issue with the H11D1, 2N3584 etc. So checked everything and found them okay. But still there was no output voltage and current, however the input was 12 volts with 2 Amps.

Then i have replaced the TIP122 with BD243C then the circuit started taking 0.3 amps with 12 volts and output voltage was around 150-160 volts.

I dont know, what is the wrong with the TIP122..... ANY GUSES.

Regards

Praveen

[pvar06]

Performance of new circuit:
- output current = 400mA
- output voltage without load = 370V
- charge at +0.1V above battery voltage for two nicad in series.
- do not make the battery hot
- charge 1000mAh under an hour, much slower than previous one transistor version but has less surface charging property.

Hi Sucahyo,

Thanks for data. Look forward for the test result with the above data.

What is the size of the battery you are charging on this circuit ...... is the testing battery was originally dead battery ........

Wish you all the success.

Regards

Praveen

[sucahyo]

Hi sucahyo. I did experiment with few. I was harvesting parts (mainly capacitors) from disposable cameras and most of them have still good AA's/AAA's. They were Fuji, Kodak, Phillips, Rayovac among others. I tried with few weaker and I was able to use them (in my toothbrush) for couple of weeks. If you overcharge them, they may explode since they're not designed to be recharged. Some don't work at all but they're free anyhow

Thanks, I read on battery book that energizer once produce rechargable alkaline. I don't know if it's still in production. I guess if one of those brand simply not working that it is designed to be dead after all.

I made a couple of them pop. So now I try to charge it in less than 30 minutes.

What is the size of the battery you are charging on this circuit ...... is the testing battery was originally dead battery ........

Thanks, the battery I currently charge is BB brand 12V 7Ah taken from APC UPS. It is a weak battery but still have proper voltage.

About the TIP122 maybe it is dead so current passing trough the transistor without beeing switched at all. See if it get very hot. I use heatsink but even with 0.4A charging two nicad it only get warm. Two nicad has a lot less internal resistance than 12V battery so can be considered as the highest load of my circuit. The one wire neon at transformer secondary will still show pulsating light when charging 12V, but it won't when charging two nicad.

Performance data charging two 1.2V nicad (1000mAh):
Input: 0.7A @ 10.4V = 7.28watt
Output: 0.45A @ 3.2V = 1.44watt (at full battery)
Efficiency: 19%

Performance data charging one 12V gel SLA (7Ah/20hr):
Input: 0.62A @ 10.5V = 6.51watt
Output: 0.24A @ 13.1V = 3.14watt(initial voltage raising before going down)
Efficiency: 48%

It seems efficiency going up when charging battery with more voltage, I guess this is the reason 12V source is used to charge 24V, also the suggestion to add more load. Just realize that current circuit is much much better in term of efficiency compared to previous one using 3055. I guess reducing the heat from 555 by using higher resistor value do help.

[sucahyo]

BTW, how long everyone 12V battery voltage climb (before it start charging at normal range) after it being connected to the charger? Mine climb to 18V or more at about 15 minutes before starting to charge at +0.5V above battery real voltage.

[pvar06]

Hi Sucahyo,

Mine 12 volts 35 Ah battery is rising upto 14.30 volts maximum. This happens within 2 hours, when I start the charging with starting voltage of 11.98 - 12.2 volts.

Regards

Praveen

[pvar06]

About the TIP122 maybe it is dead so current passing trough the transistor without beeing switched at all. See if it get very hot. I use heatsink but even with 0.4A charging two nicad it only get warm.

Hi,

I had 6-7 TIP122 in stock. I have tested three transistor and all were taking the same current. Yes the transistor gets very hot when it takes such current. Even with the brand new transistor [checked on multimeter] the current draw remains same but nothing is observed at output.

I too use a big heat sink for the transistors and Thyristor.

Regards

Praveen