Is joule thief circuit gets overunity?

[ltseung888]

Lawrence,

I have looked at the DSO Analysis.xls attached to post 552 several times.  It appears to be only the output data calculated for average output power, but no where do I see the input power data or calculation.

It should not be this difficult to communicate.  A while back you posted Board 80's screen captures as slide 12 and slide 13 in your post 503.  You said those captures indicated OU.  I have asked several times for the input and output power calculations from the data captured during that same test and represented by slides 12 and 13.  The calculations in post 552 appear to be from slide 13, but no where have I seen the slide 12 input power calculations. 

Actually, to date, I have not been able to find any posts wherein you provide input AND output power calculations from input and output data collected at the SAME time during any given test you have presented.  With some tests you post your output calculations, with others you post input calculations.

PW

@PW

I am not sure what you were looking at.  I attach the top and bottom of both Input and Output for you to check.  The same file is again attached.

[ltseung888]

ltseung888,

Please post a photo of this board.

GL.

@GL

Here it is.

[Groundloop]

@GL

Here it is.

ltseung888,

Thank you for posting the photo of the board number 107.

Ouote
  The oscilloscope analysis for Board 107.
   Average Output Power
  12.05105778 watt
   Average Input Power
  0.009865636 watt
  COP = 1221.52
End Quote

Based on common sense, do you really think your measurement of 12 Watt output is correct for this board?

You did made a output measurement over a 1 Ohm resistor in series with that small 0,1 Watt LED. Do you think
that a small LED like that will survive 12 Watt through it?

GL.

[picowatt]

@PW

I am not sure what you were looking at.  I attach the top and bottom of both Input and Output for you to check.  The same file is again attached.

Lawrence,

I am concerned that the data presented contain different record lengths for the input and output data.  Both scopes should be set to sample identically when performing your tests.

As a calibration/verification test of your scope settings, consider connecting both scope one and two to measure only the input power of a board.  That is, CH1 of both scope 1 and 2 connected to the input V (battery +) and CH2 of both scope 1 and 2 connected to the input current (batt- and CSR junction).

Perform captures as you usully do and then calculate the average power.  See if both scopes give you the same average power result.

Alternately, try performing an input/output power measurement as you normally do using scope 1 for input power and then repeat the test with the scopes swapped so that scope 2 is now measuring input power.  The calculated results from the two tests should be similar (providing you can swap the scopes and perform the second test before the circuit's operating parameters change too much).

PW

[ltseung888]

ltseung888,

Thank you for posting the photo of the board number 107.

Ouote
  The oscilloscope analysis for Board 107.
   Average Output Power
  12.05105778 watt
   Average Input Power
  0.009865636 watt
  COP = 1221.52
End Quote

Based on common sense, do you really think your measurement of 12 Watt output is correct for this board?

You did made a output measurement over a 1 Ohm resistor in series with that small 0,1 Watt LED. Do you think
that a small LED like that will survive 12 Watt through it?

GL.

@GL,

That is why I put it aside.  Much more research is needed.  The present work is focused on the normal boards such as Board 80.