A Perspective On The B Type EESD - Robert Murray-Smith - Any issues?

[MileHigh]

Brad:

Okay, here we go with the deal on your two diagrams.

Below are the two circuits,where in both cases the same amount of energy will be delivered to the inductor--lets say 100mJ of energy. I have included the batteries internal resistance that i measured !on the bench! of a normal alkaline battery with 900mV across it,and subtracted 10% of that calculated value for error margin.
Now we have the inductor in both cases storing the same amount of energy.
Can you please tell everyone here,which circuit will deliver the greatest amount of that stored energy to the LED?.

Taking your diagrams at face value, the second circuit will deliver the greatest amount of energy to the LED.

The problem is that if you are going to model the setup, you at least have to provide the right level of detail.  Taking the first diagram at face value the inductor discharges into the LED and the 7-ohm resistor.  However, the 7-ohm resistor is the output impedance of the battery.  So the question of where the energy burning off in the 7 ohm resistor comes from is a bit more complicated than that.

I marked up the drawing and swapped out the discharging inductors for voltage sources in series with resistors.

We know the the LED clamps the voltage.  Let's say that VLED is 3 volts.

Looking at the marked up diagram you can see that most likely the voltage generated by the inductor L1 is going to be relatively low.

This can all be measured on the bench to get some numbers. The energy is supplied to the circuit by the battery voltage source and the inductor as a voltage source, it is split between the two.  You can see that the load has three parts, the battery internal impedance, the L1 resistance, and the LED.  And of course we know that the inductor voltage varies with time.  All that being considered, I am not sensing any special advantage with respect to going with the lower circuit where you eliminate the battery impedance.

I have stated many many times that when you get into low-level details like this you need to do a full power/energy audit for a circuit to know exactly where the power/energy goes.  However, I have never seen you do this once, and I am sure you have read me state this before.

MileHigh

[d3x0r]

@all

World's first ‪#‎graphene‬ battery product unveiled in Beijing. The portable battery can be fully recharged within 15 minutes, about 20 times faster than a Li-ion battery.


https://www.facebook.com/XinhuaNewsAgency/videos/1322484261112348/ 


Ya...so this makes my opinion that....  Mile High is Soooo HIGH!   Even *I* don't smoke THAT much.
ya, a minor thing just outside your personal preference and way in the area of gross error... it IS still a good thing.

[MileHigh]

@all

World's first ‪#‎graphene‬ battery product unveiled in Beijing. The portable battery can be fully recharged within 15 minutes, about 20 times faster than a Li-ion battery.


https://www.facebook.com/XinhuaNewsAgency/videos/1322484261112348/ 


Ya...so this makes my opinion that....  Mile High is Soooo HIGH!   Even *I* don't smoke THAT much.
ya, a minor thing just outside your personal preference and way in the area of gross error... it IS still a good thing.

I like to have xes in airplanes you fool.

It's not a graphene battery product unveiling.  It's just a fancy press release technology announcement but no product.  If you have ever looked at the Revolution Green web site over the past three years there have probably been 50 very similar announcements about new battery technologies.  Unfortunately none have come to market yet.

The simple facts are that Robert Murray Smith made a clip where he claimed that he had a capacitor the size of a credit card that was 2000 Farads but offered no measurements at all to prove his claim.  He has made some technical gaffes in the comments on some of his clips that make you wonder if he even knows how to properly measure the capacitance.  Hence, he runs a small electric motor as a diversion to deflect away from the measurement issue.

Here is what I said to RMS:

<<<
A Maxwell K2Series BCAP 2000 Farad ultracapacitor is in a can that is 10 cm long x 6 cm in diameter.  In one of your clips you claim that you made a home-brew 2000 Farad capacitor that is roughly the size of a credit card.  Let us be conservative and say that you are claiming 10X the energy density by volume with your credit card sized capacitor that you claim is 2000 Farads. The onus is on you to prove that is true - that your credit-card-sized capacitor is 2000 Farads because right now I do not believe it.
>>>

You agreed with me that RMS made a ridiculous and unacceptable mistake where he measured the current flow over time but ignored the voltage measurement.

You said this:

so ya pretty high estimate...

How about you have the courage to state that RMS made an unacceptable measurement error when he measured the current but did not measure the voltage?

I also challenge you to retract your statement alleging that I am a troll.

[tinman]

I like to have xes in airplanes you fool.

It's not a graphene battery product unveiling.  It's just a fancy press release technology announcement but no product.  If you have ever looked at the Revolution Green web site over the past three years there have probably been 50 very similar announcements about new battery technologies.  Unfortunately none have come to market yet.

The simple facts are that Robert Murray Smith made a clip where he claimed that he had a capacitor the size of a credit card that was 2000 Farads but offered no measurements at all to prove his claim.  He has made some technical gaffes in the comments on some of his clips that make you wonder if he even knows how to properly measure the capacitance.  Hence, he runs a small electric motor as a diversion to deflect away from the measurement issue.

Here is what I said to RMS:

<<<
A Maxwell K2Series BCAP 2000 Farad ultracapacitor is in a can that is 10 cm long x 6 cm in diameter.  In one of your clips you claim that you made a home-brew 2000 Farad capacitor that is roughly the size of a credit card.  Let us be conservative and say that you are claiming 10X the energy density by volume with your credit card sized capacitor that you claim is 2000 Farads. The onus is on you to prove that is true - that your credit-card-sized capacitor is 2000 Farads because right now I do not believe it.
>>>

You agreed with me that RMS made a ridiculous and unacceptable mistake where he measured the current flow over time but ignored the voltage measurement.

You said this:

How about you have the courage to state that RMS made an unacceptable measurement error when he measured the current but did not measure the voltage?

I also challenge you to retract your statement alleging that I am a troll.

MH

Forget about RMS-there are bigger fish to fry.

I would like you to have a look at Mark Dansies latest thread,and let us know what you think.

Time to leave all the !will never work!stuff behind,and look at something that dose have potential.

What do you know about this ion transfer stuff?


Brad

[seychelles]

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