Akula0083 30 Watt Self Running Generator.

[Grumage]

Dear All.

This just appeared on the Kapanadze thread.

http://www.youtube.com/watch?v=4C4vzlW0Oxw&list=UU8wodvsxDbBQxihf_ilGIuA

Enjoy !! 

Cheers Grum.

[Google]

Here is the circuit before it disappears from YT. 

Best,

[Tseak]

Hi all

what is this mean ?

I might be speaking out of turn because I haven't read the whole thread yet. I've skipped through it.  It is a very strange configuration. In answer to your question re the "plate" :- I think that this represents a shield winding. This is generally a grounded turn of foil wound between the primary and secondary windings. Its purpose is sometimes for safety reasons so that there is complete galvanic isolation from the primary(used in mains fed circuits where human life is at risk eg on medical machines). In this case it will serve to reduce capacitive coupling between primary and secondary. With this configuration its only real effect would be to reduce stress on the diode D5 by reducing high frequency reverse bias whilst the diode is still switching off (I am referring to component designations on the redrawn circuit because it is so much easier to see).

The circuit is essentially a flyback configuration with the primary is used as a choke, not a transformer.  It is a current controlled circuit with R17 as the current shunt in the feedback loop. TL494 pins 1,2 and 3 form the current loop. Pins 15, 16 and 3 form the voltage loop. The secondary seems to only provide an auxiliary feedback mechanism.

There are lots of funnies in this circuit.

--For example why use the 7812 regulator. The feed is 12 volt battery and depending on the particular flavour the 7812 has a dropout voltage of about 2.5 volts hence no regulation. All the devices fed with 12 volts can withstand up to 20v. the regulator doubly pointless.

-- The control loops are unusual for no apparent reason.

--The secondary(auxiliary) winding serves no real purpose and introduces further losses. It probably boosts the voltage into the primary but what for? The energy for this comes from the primary flyback voltage.

-- Why couple the secondary winding to the output of the primary?

Lots of questions.  I must say this has intrigued me and I'll look at it further when I get a chance - hopefully later this week, but my first reaction is that this is simply a poorly designed flyback boost circuit. Perhaps some of these comments will trigger other peoples' ideas.

[lost_bro]

Good Day Tseak:

I might be speaking out of turn because I haven't read the whole thread yet. I've skipped through it.  It is a very strange configuration. In answer to your question re the "plate" :- I think that this represents a shield winding. This is generally a grounded turn of foil wound between the primary and secondary windings. Its purpose is sometimes for safety reasons so that there is complete galvanic isolation from the primary(used in mains fed circuits where human life is at risk eg on medical machines). In this case it will serve to reduce capacitive coupling between primary and secondary. With this configuration its only real effect would be to reduce stress on the diode D5 by reducing high frequency reverse bias whilst the diode is still switching off (I am referring to component designations on the redrawn circuit because it is so much easier to see).

Plate could be electrostatic part of ground loop : to maintain ground when battery is disconnected.

The circuit is essentially a flyback configuration with the primary is used as a choke, not a transformer.  It is a current controlled circuit with R17 as the current shunt in the feedback loop. TL494 pins 1,2 and 3 form the current loop. Pins 15, 16 and 3 form the voltage loop. The secondary seems to only provide an auxiliary feedback mechanism.

In theory  the feedback should track frequency?

There are lots of funnies in this circuit.

--For example why use the 7812 regulator. The feed is 12 volt battery and depending on the particular flavour the 7812 has a dropout voltage of about 2.5 volts hence no regulation. All the devices fed with 12 volts can withstand up to 20v. the regulator doubly pointless.

Yes, allegedly the circuit will put out over 35volts when battery is disconnected and is left to free run:  Must check specs on IRF3205  MOSFET Gate to Source volt max.; could be there to keep stable voltage for Max voltage limits. 
I agree a Buck/Boost converter would be more efficient if that is the reason.

-- The control loops are unusual for no apparent reason.

Don't understand them either, yet!!!

--The secondary(auxiliary) winding serves no real purpose and introduces further losses. It probably boosts the voltage into the primary but what for? The energy for this comes from the primary flyback voltage.

According the supposed operating principal:  the L2 winding is processing and injecting the flyback voltage from L1 during the OFF cycle of L1 to the In-put side of the Voltage Regulator to keep the thing running when the battery is disconnected.

-- Why couple the secondary winding to the output of the primary?

To recycle the flyback energy?

Lots of questions.  I must say this has intrigued me and I'll look at it further when I get a chance - hopefully later this week, but my first reaction is that this is simply a poorly designed flyback boost circuit. Perhaps some of these comments will trigger other peoples' ideas.

Yes, we need more people to analyze this circuit and build it:

Take care. Peace.
lost_bro

[4Tesla]

Can someone who is Russian speaking inform Akula about this thread in his  honour?
If he wants to contribute in Russian it is fine.
We respect him here.

I have invited him to join in here and over at OUR.