Exploring the Inductive Resistor Heater

[TinselKoala]

@TinselKoala: I am not a judge between you.

Greg in his first post already estimated the maximal energy contribution from the Gate Driver, which seems to be no big deal. As for the Gate current, Greg might be talking about gate leakage current, not the current to induce the voltage difference.

Transistors are gated by currents, while MOSFETS are gated by voltage difference, and to develop voltage difference there is a "hidden cap" (so to speak) at the Gate. The current depends on the frequency, max voltage difference, the current limiting resistor, and the capacity of the hidden cap. The gate leakage current is due to the imperfect insulation inside the "hidden" cap.

regards,

lanenal

I see that you, too, do not bother to watch my videos. Nor do you seem to understand the issues. The current flowing from the Gate to the Drain or Source of a mosfet under the dynamic conditions illustrated in my video and experienced by circuits such as Gmeast's and Ainslie's is NOT the 100 nA steady-state leakage current, nor is it "the current to induce the voltage difference" necessary to switch the gate, nor is it due to "the imperfect insulation" inside the "hidden" cap. It is a normal consequence of presenting a pulsed or AC signal to a capacitor.

Please watch my video above, and then explain how and why the light bulb attached to the function generator "probe" lights up when I have the FG connected between Gate and Source, or Gate and Drain of the mosfet... whether the mosfet is working in a circuit or not.

[lanenal]

Lanenal,

That is exactly my point.  You think that the example I gave appears to be OU.

If one connected a desulphator to a battery and applied a load and noted the discharge time to a given stop voltage, and then did the same using the same load but without the desulphator connected and noted a shorter discharge time, there would be those who would claim that the desulphator produces overunity.

But, who ever said that a battery is "unity" to begin with?  A battery produces waste heat during both charge and discharge.  Suppose the charge/discharge efficiency of a lead acid battery is 70%.  Suppose the use of a desuplhator can increase this to 85%.  Though better, still not OU.

Desulphators supposedly produce finer grained sulphate crystals effectively increasing plate area.  As well, pulse and reverse pulse plating similarly are known to produce finer grained structures.  Visualize large clumps of sulphate crystals forming at the plates as opposed to a much smoother, finer grained structure.  As well as an increase in surface area, less resistive losses occur over the finer grains.  This is, supposedly, how a desulphator functions, and the waveforms used to desulphate have much in common with the waveforms of these OU circuits.

Do a search for "battery desulphator".  There are both construction articles as well as commercial units available.

I am not stating with any certainty that these effects are the reason for the observed OU, but, as these effects have been observed regarding lead acid batterys when being pulsed or reverse pulsed, should they not, at the very least, be considerd and ruled out as the reason for the observed OU?

As well, has anyone ever demonstrated the ability to discharge more energy from a battery than was required to charge it to begin with?


PW[size=78%] [/size]

PW, you don't seem to understand what I am talking about. Your very argument about battery capacity is against the law of energy conservation. Your lengthy argument only seem to mislead and misinform people.


lanenal

[lanenal]

I see that you, too, do not bother to watch my videos. Nor do you seem to understand the issues. The current flowing from the Gate to the Drain or Source of a mosfet under the dynamic conditions illustrated in my video and experienced by circuits such as Gmeast's and Ainslie's is NOT the 100 nA steady-state leakage current, nor is it "the current to induce the voltage difference" necessary to switch the gate, nor is it due to "the imperfect insulation" inside the "hidden" cap. It is a normal consequence of presenting a pulsed or AC signal to a capacitor.

Please watch my video above, and then explain how and why the light bulb attached to the function generator "probe" lights up when I have the FG connected between Gate and Source, or Gate and Drain of the mosfet... whether the mosfet is working in a circuit or not.

If you really understood what I have wrote to you, you won't say all that nonsense. You are amazing.

[lanenal]

Hi Greg,

I have watched your video, and I have a question for you about the measured voltage drop over SH3 when the circuit is hooked up. Since the voltage should be oscilating, what you measured must be some sort of average voltage, right? Is it RMS? or is it something else?

great job, and thanks for sharing.

lanenal

It would be great to know more about your set up. For example, what is the frequency and duty cycle of your signal sent to the gate? What is the resistance/inductance of your RL? From that I can actually calculate the battery energy spent on the RL. Also, please share about what material is used to construct the RL and what other things to note in the construction. What kind of Diode and MOSFET is in use, etc. Thanks!

[TinselKoala]

If you really understood what I have wrote to you, you won't say all that nonsense. You are amazing.

In the video I CLEARLY SHOW THE MOSFET PASSING FAR MORE THAN 100 nA between the Gate and the Source and also between the Gate and the Drain. I do this with the mosfet operating in a circuit from a different power source, and I also do this with the "bare" mosfet disconnected from any power source except the FG. Then I hook the mosfet back into the powered circuit to show that it is still operational and still works as a normal mosfet.

According to you, and to Gmeast, this is impossible. So I want your explanation as to how I did it.


You are amazing with your nonsense, that's for sure. You won't even deal with the issues, nor will you bother to educate yourself, nor do you deal with the points I raise, or that PW raises, directly.

I'll put my knowledge of MOSFETS and their operation up against yours any day, any time, lanenal. Where are your demonstrations, where are the devices you've built using mosfets, what are your qualifications to even be in this discussion? As far as I am aware, you have NONE.