POC transformer with AMCC 640 core

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  • Last Post 12 February 2020
Forelle posted this 10 February 2020

Hi everyone

I start a new thread about POC transformer with AMCC640 core.

Coils:

L1 Violett has 36 turns with middle connection at 18 turns and wound above L2 which has 144 turns,both ccw,2mm Cu-magnetwire 

L3 blue has 144 turns cw wound.

Dutycycle 5% frequency 100hz,on L2 yellow  and L3 is a adjustable resistor,no lamps.In the next days i upload the circuit.

 

My next goal is to prolong the sawtooth.Have a good day.

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Chris posted this 10 February 2020

Hey Oliver,

EXCELLENT WORK! Well done my friend! If I could give you 10 thumbs I would!

Please remember, all of us here can help, some have more experience than others, but please ask if you need!

You should be so proud! First go, you got the waveform! Excellent Job! 

Some things that may help,

  • Length of the Coil vs Magnetic Field Strength.
  • Frequency and Duty Cycle.
  • Try different loads. Different resistive values.
  • Yes, you are right, aim toward maximising the Wave Amplitudes for least Input. In turn this extends the Time of the Output Period.
  • Please publish the circuit your'e using, so others can help more.
  • Please ask, we, I am happy to help! We are one big happy family here!
  • Don't forget about the PayPal Donate Buttons? A financial donation from time t time to help never goes a miss!

 

I can help you with the Member Only Optional PayPal Support Button if you need? Let me know!

I am so pleased your'e here with us, working for the future like us!

Best wishes,

   Chris

Forelle posted this 10 February 2020

Hi Chris and all, I am glad that you are satisfied so far with my device.I thought that the efficiency would be maybe better if the L1 is wound on the first Layer with a middle connection and not on top of L2. As load i have adjustable resistors and it Looks like a Short circuit is the most efficient,but than i have of course Zero Volt.I am at the beginning to know how the device is behaving.(sometime it screams sometime it laughs 😜) The rest of the missing information comes soon. p.s. since a year i spend around €10 ,- every month to aboveunity ,not much but better than nothing. Have a good day Oliver

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Forelle posted this 10 February 2020

I forget to mention to prolong the sawtooth wave ,one way is to make a gap between the cores,at the moment i dont have one. Thanks

Chris posted this 10 February 2020

Hey Oliver,

Learn as much as you can with this experiment, then take little steps to improve the wave-forms. It wont be long before you see really good output!

Remember, the Primary and one secondary is equivalent to a transformer, so this part should be very efficient, around 80% or so. The rest is there to increase efficiency, to push past the Unity Boundary.

80% x 2 is 160% or COP = 1.6 which is the common success rate for those that make initial step into AU territory. E.G Here.

Read between the lines on that one, there is more meaning there!

Best Wishes,

   Chris

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Forelle posted this 11 February 2020

Hi everyone,

here is the circuit of the switch,nothing special,only the signal input is isolated with a Silicon Labs Si8235ab 5v input from the SG and extra 12V battery on the Mosfetside.I dont know why it is such a bad quality,here are the parts:

22R gateresistor

1K discharge 

Irfp260N Mosfet

7x UF5408 for each coil

0-14 Ohm adjustable powerresistors

Please ask if something is not clear .

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Forelle posted this 11 February 2020

Hi Chris

An other question,do you know is there a difference if the gap of the core is on both sides ?Normaly one side is closed and the other has a gap.The magnetfields are then different.

Have a good day

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Vidura posted this 12 February 2020

Hey Forelle The driver IC should be grounded on the MOSFETs source ? Vidura

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Forelle posted this 12 February 2020

Hi Vidura You are right,sorry to all for my mistakes,in reallity i have it right but when i changed the coils from between drain and+ to between source and- i did not take the Time to go trough it 😊 Thanks for telling.

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Chris posted this 12 February 2020

Hey Oliver,

Don't apologise, its easy fixed. we are all here to help others where we can. wink

Best wishes,

   Chris

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