PJKelly Battery Charger

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  • Last Post 30 November 2023
AlteredUnity posted this 28 November 2023

Lately I pulled out of my bench a coil I wound years ago to attempt a project from PJKelly Ch33. It is wound with 100turns bifilar coil, and on top of that around 190turns of wire(I ran out of room to do a full 208 turns).

The bifilar is ran as a simple joule their, with a 5k resistor at the base. I haven't had a lot of time to completely test the setup, and verify that an actual charge is put on the receiving battery, and I will upload pics and details later.

The first battery I connected was the small one you see in the video, it started with 1.28volts(so I assume it's a bad battery). My PS wouldn't even charge it. After 2 hours it read around 7volts. I charged it all night and it's now up to 10volts, the circuit without a bulb is only consuming about 20ma.

So far the circuit seems promising, though will probably need to make coils wider, and more turns on secondary.

https://www.youtube.com/shorts/yPkBRPizIkM

When I get home I will show waveforms, also some questions I have regarding strange things that happen when a ground is connected.

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AlteredUnity posted this 28 November 2023

Lately I pulled out of my bench a coil I wound years ago to attempt a project from PJKelly Ch33. It is wound with 100turns bifilar coil, and on top of that around 190turns of wire(I ran out of room to do a full 208 turns).

The bifilar is ran as a simple joule their, with a 5k resistor at the base. I haven't had a lot of time to completely test the setup, and verify that an actual charge is put on the receiving battery, and I will upload pics and details later.

The first battery I connected was the small one you see in the video, it started with 1.28volts(so I assume it's a bad battery). My PS wouldn't even charge it. After 2 hours it read around 7volts. I charged it all night and it's now up to 10volts, the circuit without a bulb is only consuming about 20ma.

So far the circuit seems promising, though will probably need to make coils wider, and more turns on secondary.

https://www.youtube.com/shorts/yPkBRPizIkM

When I get home I will show waveforms, also some questions I have regarding strange things that happen when a ground is connected.

Jagau posted this 28 November 2023

Just found the circuit

It's a good circuit to experience

Jagau

Attached Files

AlteredUnity posted this 28 November 2023

Thanks Jagau, I didn't have this one, I was going off memory. Seems I can probably improve the performance. I will do that tonight.

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AlteredUnity posted this 30 November 2023

Made changes based on the circuit in Jagau's last post minus the two extra dioes going from the bridge rectifier, performance seems to have increased even more. Without receiving battery attached the circuit is consuming .5 amps, though once I placed battery on output its only using 5ma, and the output looks pretty great.

After bridge rectifier:

Voltage waveform on output wires before bridge rectifier:

Only had a few mins after work to implement that, so I still cant comment on its charging performance, though with last circuit it did bring battery back to life and was able to run a small load. I still plan on making adjustments when time permits. The ringing waveform without a load connected is over 600volts

 

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