cop > 1

[Inquorate]

@Inquorate,

Attached is my new emitter follower oscillator battery charger.
The circuit is approx. 82% efficient when powering a resitive
load of 22 Ohm.

Here is what I like about this circuit:

+You can disconnect the charge battery while the circuit is powered without any harm
to the circuit. The charge battery is in series with the power coil so the circuit just stops
when the battery is disconnected.

+The circuit is self adjusting when charging. When the battery is empty then the internal
resistance of the battery is high. The charge current will then be low. When the battery
starts to charge then the internal resistance of the battery drops and the charger increase
the charge current. This will shorten the time it takes to fully charge the battery.

+There is little waste of heat in the circuit. Since this is an emitter follower oscillator then
the base currents is not wasted but goes through the power coil.

+The polarity of the power input can be accidental switched without any harm to the circuit.
The diode at the minus terminal will block the positive wire. The oscillator will simply not
run with wrong electric polarity.

+The circuit works well over a great range of input voltages. The operator can adjust the
input voltage to get the correct charge power going to the battery. The frequency of
the oscillator also goes up at higher input voltages. This improve the efficiency even
more when charging several batteries connected in series. (Battery bank).

I can say for 100% sure that this CIRCUIT is not over unity. What I can't test is if
the process of pulse charging lead acid batteries is a over unity process. I have no time to
do a endless battery swapping so I leave it up to others to prove if a pulse charging
of batteries is a over unity process.

Groundloop.

[Inquorate]

How can I delay the voltage spike from secondary of bifilar coil to increase charge time?

Video

http://www.youtube.com/watch?v=n6qxhCVST-M

Image

http://inquorate.vox.com/library/post/how-can-i-delay-the-voltage-spike-from-secondary-of-bifilar-coil-to-increase-charge-time.html

Any suggestions welcome

[e2matrix]

I know you are way smarter on this stuff than I am so I hesitate to even suggest this as I'm sure there is a reason you haven't considered it but just in case it might work:  a cap and a spark gap? 

[guruji]

Groundloop I've build that multicoil but it did not work .
I had to modify that instead of a 100k resistor I did a pot cause it's oscillating on about 2k or less I should find the exact resistance and do a solid one cause it's burning the pot every time.
About the multicoil I should see what is the problem maybe I'm using asmall cap  104 and should do it bigger as you told me. I have to experiment more.
Thanks

[Groundloop]

@guruji,

Try a larger ceramic capacitor.
If you use a small resistor value then use a 1 to 2 watt type.

Also try to swap the trigger coil. The oscillator will also run if the trigger coil is swapped wrong
and the bias to the transistors is set very high as you did. The resistor is just there to
give the transistor a LITTLE positive bias so that the oscillator will start to run. After that
the capacitor will AC couple the trigger coil to the emitter and keep the oscillator going.

Groundloop.