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 Post subject: 250mA output radiant oscillator
PostPosted: Wed Oct 21, 2009 7:24 am 
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Here is my latest circuit which help me charge two nicad in series in under one hour, 12V under 6 hour.

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%

Attachment:
File comment: direct radiant charger
charger2transswitch.jpg
charger2transswitch.jpg [ 23.2 KiB | Viewed 1734 times ]



I also have cap dumping circuit version. But I will avoid using it since it make my 12V battery store only voltage and make the nicad heat up, both are the sign of non pure radiant. Maybe because my capacitor is electrolyte version.

Attachment:
File comment: cap dumping radiant charger
caprelay555.jpg
caprelay555.jpg [ 22.78 KiB | Viewed 1734 times ]


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 Post subject: Re: 250mA output radiant oscillator
PostPosted: Sat Oct 24, 2009 6:09 pm 
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Try charging more cells in parallel for higher eff.,
SIMPLE Bedini machines have reached much higher
COP's with conditioned batteries. Presumably, the
radiant energy can charge around 4X more batteries
(in voltage ratings) than the drive voltage, with no
reduction in charge rate (time).

I have gotten preliminary results that were very good, I'll post the link.

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 Post subject: Re: 250mA output radiant oscillator
PostPosted: Mon Oct 26, 2009 4:41 am 
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Notice that my circuit efficiency actually increase when the load has higher voltage. I would think the opposite, more battery in series will improve efficiency.

For charging time I do notice that when I charge at 1Amp output for nicad it get faster but make the battery hot, it also make 12V battery hot too at 250mA.

I am now using 10K ohm at the base to charge nicad at two hour. I am not counting effciency now, just trying to make the battery has improved capacity. So far as long as the charging do not heat up the battery, it would have good capacity.


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 Post subject: Re: 250mA output radiant oscillator
PostPosted: Mon Dec 21, 2009 10:28 pm 
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Any Updates SucY?


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 Post subject: Re: 250mA output radiant oscillator
PostPosted: Thu Jan 14, 2010 5:40 pm 
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sucahyo wrote:
...I also have cap dumping circuit version. But I will avoid using it since it make my 12V battery store only voltage and make the nicad heat up, both are the sign of non pure radiant. Maybe because my capacitor is electrolyte version.

Attachment:
caprelay555.jpg


Are you cap dumping into the charge batt or the source batt?
I am interested in a cap dump to source, to increase input efficiency.

Rob

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 Post subject: Re: 250mA output radiant oscillator
PostPosted: Fri Jan 15, 2010 9:32 am 
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Sorry for late answer.

I use modified joule thief now after my 555 broke. I can rebuild the device but found that my modified joule thief is a lot more efficient.

Image

The resistor may need to be different for different type of coil. Try to find the highest output. Too high resistance will reduce output current, too low will increase input current but reduce output current.


I never dump the cap back to the source because still don't have a way to do it in simple solid state. Charging back the source need some trick, the cap negative connect to battery positive while charging and connect to battery negative while dumping.


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 Post subject: Re: 250mA output radiant oscillator
PostPosted: Tue Jan 19, 2010 5:08 am 
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I had thought about using a DPDT relay for dumping back to source, but you would need a voltage sensitive control circuit, or much simpler,
use a timer relay and kill 2 birds with 1 stone :D
Set the time for optimum cap charging, and then it dumps to source.
Relay might be a bit expensive, but worth it if current draw is low enough. Guessing, but under $50 US is likely.

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 Post subject: Re: 250mA output radiant oscillator
PostPosted: Mon Jan 25, 2010 8:38 am 
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The problem with relay is speed...

But how come it cost that much? I think we can use small 12V chinese relay at under $1. Use three to simulate dpdt if you can only find spdt.
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