Author Topic: EEVblog #811 - How The Varta 15 Minute Battery Charger Works  (Read 43222 times)

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Offline oldway

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Re: EEVblog #811 - How The Varta 15 Minute Battery Charger Works
« Reply #150 on: November 06, 2015, 08:06:50 am »
I hope you will share the results of your compiled data, it will be very interesting, you have done a very fine job  :-+
 

Online HKJ

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Re: EEVblog #811 - How The Varta 15 Minute Battery Charger Works
« Reply #151 on: November 06, 2015, 08:18:00 am »
I hope you will share the results of your compiled data, it will be very interesting, you have done a very fine job  :-+

Here you have the curve with energy:

Delta voltage is voltage above 1.50 volt

At best you get 80% of the energy back.

For the rest of the article see here: http://lygte-info.dk/info/batteryChargingNiMH%20UK.html
The mAh efficiency is just a small part of the article.
 

Offline Svuppe

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Re: EEVblog #811 - How The Varta 15 Minute Battery Charger Works
« Reply #152 on: November 10, 2015, 04:04:31 am »
Has anyone figured out what processor is used in this charger yet?
I had a quick look at the voltages on the pins, and most are either 0 or 5V, indicating a 5V processor. But one pin puzzled me: Pin 18 is at 5.65V

They could be feeding it higher than Vcc through a resistor, and relying on the processors internal esd protection diode to clamp the voltage.
 

Offline Mr Smiley

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Re: EEVblog #811 - How The Varta 15 Minute Battery Charger Works
« Reply #153 on: November 10, 2015, 04:37:40 pm »
Hi All,

I had a few VANSON 1 hour chargers. The first one failed by cooking the battery in the first slot. Then the second one started to do the same, again in the first slot. I tried drawing out the circuit and was as confused as Dave was at the beginning.

I did eventually find a schematic for a VARSON V6000, which was a re-branded version of the one's I had. It was multiplexed in operation.

Not quite the same as this VARTA, the fets are transistor driven and there's no discharge function but I've added the schematic for you to see.

Might put some insight on how the VARTA works  :-+

There is enough on this planet to sustain mans needs. There will never be enough on this planet to sustain mans greed.
 


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