Re: [EVGRAY] charging a coil like a cap

Body

Hi Karl,

"The 73 volts is measured open circuit  across the coil from collector to top of coil. Not from top of coil to base of transistor."
Then from 0V (emitter) to collector is the voltage across the coil (73V) plus the voltage across the voltage supply (5V) minus the voltage across the rectifying diode.

If the peak voltage is a smooth half sine wave (bottom up parable) the transistor doesn't go into avalanche mode. Then it's the parasitic capacitance of the coil that limits the peak voltage.

If a higher flyback voltage is wanted a high voltage transistor like the ones used to drive the flyback transformer in old CRT screens could be used. Some of these have breakdown voltages above 1kV like the BU208 http://www.alltronics.com/mas_assets/acrobat/BU208A.pdf or BU508 http://pdf.datasheetcatalog.com/datasheets/savantic/787.pdf. The flyback voltage were further stepped up by using a high tension secondary winding on the flyback transformer and then feeding a voltage tripler http://www.interfacebus.com/Glossary-of-Terms-Voltage-Quadrupler.html to reach the extremely high tension for accelerating the electron beam. When using a step up winding this down transforms the current at the same ratio as the voltage step up ratio. The peak current of the flyback pulse is the current reached when breaking the input cycle assuming no secondary winding is used.

Regards
Ole
 

---In [email protected], <kwagnert@...> wrote :

 The 73 volts is measured open circuit  across the coil from collector to top of coil. Not from top of coil to base of transistor. 
 

---In [email protected], <onielsen@...> wrote :

 Hi Karl,

At 73V across the coil added to the 5V supply voltage minus the diode forward conduction drop of around .7V the transistor CE probably breaks down if NE-3055 is the same as 2N3055. This transistor has a CE breakdown voltage with no base current of 60V according to the datasheet: http://www.onsemi.com/pub/Collateral/2N3055-D.PDF http://www.onsemi.com/pub/Collateral/2N3055-D.PDF.

This simple inverter (flyback converter) is basically a constant current generator. The output voltage is limited by the breakdown voltage of the transistor and the parasitic capacitance of the coil. There is nothing preventing the circuit from overcharging the battery.

Regards
Ole
 

---In [email protected], <kwagnert@...> wrote :

 

 This is the way the circuit should be for pure back "EMF only" charging. This is what I use to charge all my AA, AAA and 9 volt batteries. No forward DC pulse with current, as in Rene's circuit. I need a large Toroidal Ferrite core to try this on large 6 or 12 VDC flooded batteries. Haven't tried that yet. But for small batteries, this has worked perfectly, batteries remain cold, and brings back almost all dead alcalines, Ni-Mh and NiCads. It's basically a joule thief but instead of taking the output from collector and emitter, as it's usually done to light LEDs, I take the output from the high spike collapsing coil.


 The input power supply is a 5VDC wall power supply. The measured output voltage  across the coil is around  73 VDC, measured without charging  battery and from collector to anode of diode and a temporary cap so it can be measured correctly due to high frequency. Frequency varies from 15 Khz to around 150 Khz  or more, depending on the bias. Transistor is a standard NE-3055

 
 On May 27, 2018, at 10:00 AM, "konehead@... [EVGRAY]" <[email protected] mailto:[email protected]> wrote:   
 Hi Mick
 I think I can help since I made quite a few rene chargers....
 The circuit first sends an 18VDC to 22VDC charge through the battery...call this a forward-charge....it does this via a self-oscillating transistor pulsing in the DC charge, this charge is not from a cap-discharge , but simply a rectified to DC charge from the power-supply such as a transformer 120VAC to 20VAC, then rectified (what I did)
 So think of this primary charge to 12V battery simply a transformer 120VAC to 20VAC, rectify it, and pulse it into battery....This is the "first stage" of a rene charger....
 Now AFTER this pulsing happens, and after each pulse, there is a backemf spike that gets recovered and also shoves itself into the battery that Rene calls a "RE-backemf charge" so for every pulse that happens there are two that charge the battery, one "forward" then one the backspike coming off  of the pulsing too...
 

 To ne I think the Bedini wheel charge is superior, since it is a PURE backemf/recoil/flyback charge going into lead acid batteries...no "forward" conventional pulse through the battery first as in a rene charger...
 

 Perhaps with a rene charger you can find a very particular charging cycle for particular batteries in how far to deplete until charge cycle, and how high to charge during charge cycle where a rene charger will work overunity via comparison of watts to charge over time  vs watts to run load over time...
 

 So, I would say  Bedini wheel is superior especially from the very believable reports Warren did of charging every battery from just about everyone in his marina one winter....he ran his bedini wheel on a small 7AH 12V battery (4AH?) that he only needed to charge back up once a week and this took only a couple hours,  and during that week, he managed to charge up many big marine batteries (that all do serious work in people's boats)...it seems to be way overunity, and very practical for of overunity too.
 Warren also reported that his marina-friends would keep bringing the batteries back after running them down and they charged up better than they had ever seen before....
 ciao
 Kone