Is joule thief circuit gets overunity?

[ltseung888]

Lawrence,

I suggest you slow down and focus on just one board and attempt to demonstrate input and output data calculations that support your claim of OU using that one board and data set.

You posted "Board 107 input.jpg" and "Board 107 output.jpg" in reply 553.  Looking at thos captures, there is no evidence of OU.

Yet here in this post you present data that somehow is supposed to indicate that board 107 has a COP=1221.52.

In the spreadsheet that is somehow supposed to support your claim of COP=1221.52, the provided input power waveforms are nothing at all like those of board 107 shown in your reply 553.

You appear to be mixing and matching data and never seem to provide a spreadsheet that shows BOTH the input and output calculations for given set of waveforms.

I would suggest you pick one set of scope captures for one board, post the .jpg's of the input and output power screen captures and the spreadsheets of the calculated average power for those screen captures.

PW

@PW:

Read reply 562 and 563.  Any change in DC Power Supply value will change the waveforms!

[picowatt]

@PW:

Read reply 562 and 563.  Any change in DC Power Supply value will change the waveforms!

Lawrence,

This reply would be fine had asked if changes in supply voltage affect the waveform.  I did not ask for that.

However, I am asking for you to post a pair of input and output screen capture .jpg's taken from a board at the same time and then provide spreadsheets that calculate both the input and output power of the data from those screen captures.

So far I have been unable to find one instance where you ave done this.

A good place to start would be for you to provide spreadsheet calculations of the board 80 input and output captures which are slide 12 and slide 13.

PW

[ltseung888]

A systematic analysis on Board 80 will be done in the next few days or weeks.

The analysis will cover at least the following:
(1) Low Input Voltage so that CH2 Vavg is of relatively large positive value - giving rise to small negative COP
(2) Higher Input Voltage so that CH2 Vavg is of relatively small positive value - giving rise to large negative COP
(3) Higher Input Voltage so that Ch2 Vavg is zero - giving COP value equal to infinity!
(4) Higher Input Voltage so that CH2 Vavg is of relatively small negative value - giving rise to large positive COP
(5) Higher Input Voltage so that CH2 Vavg is of relatively large negative value - giving rise to small positive COP

Be patient.  I think I can get a 4-CH DSO to do the above.  That will resolve all problems related to not having simultaneous Input and Outpur measurements.  Poynt99 can do that for us.  (Or a Top University can do that for us.)

@PW

Do you have a 2 or 4-CH DSO?  If so, I shall be happy to send you one of the Zhou Boards.  You can then have fun yourself and do any analysis at your leisure.  Remember that I sow seeds only.

[picowatt]

The full paper will take weeks if not months.  Meanwhile, I shall post some raw data for those who would like to do the analysis themselves.

The data is from Board 80 meant for the Hong Kong Government.

Lawrence and all,

Can someone please set up the excel "input.xls" included in the above quoted post so that the input V is corrected and the VxI product is displayed in the a column with an average of all VxI products is generated?  (this is supposed to be the input data set for slide 12 of post 503, which is Board 80)

At least then we would have a full set of input/output captures and an average Pin and Pout calculated from at least that capture data.

I have no idea how Lawrence can make ANY claim without at least doing this for all boards and captures.

Lawrence...  If you don't think you can make a proper analysis until you have a University or such do so, I suggest you stop posting unsupported claims until then.  That is just a suggestion.  It tends to erode your credibility.


Thanks,

PW

[ltseung888]

Lawrence and all,

Can someone please set up the excel "input.xls" included in the above quoted post so that the input V is corrected and the VxI product is displayed in the a column with an average of all VxI products is generated?  (this is supposed to be the input data set for slide 12 of post 503, which is Board 80)

At least then we would have a full set of input/output captures and an average Pin and Pout calculated from at least that capture data.

I have no idea how Lawrence can make ANY claim without at least doing this for all boards and captures.

Lawrence...  If you don't think you can make a proper analysis until you have a University or such do so, I suggest you stop posting unsupported claims until then.  That is just a suggestion.  It tends to erode your credibility.


Thanks,

PW

@PW,

You probably missed it with the hugh number of posts.  See reply 552.  It contains the full DSO analysis for Board 80.  The first sheet is the Output.  The second sheet is the Input.  The various wavforms such as Voltage, Current and Power are also displayed.  The saved BMP files are included for comparison.  The COP was calculated to be 1.41 at the end of first sheet.

@All,

I also tried to get CH2 Vavg to 0V by adjusting the DC Power Supply.  The readings were fluctating and I could not get a perfect steady reading.  However, when CH1 Vrms was at 680mV, CH2 Vavg fluctuated between 4mV and -2mV.