Claimed OU circuit of Rosemary Ainslie

[Rosemary Ainslie]

Guys,

The bump on the Vsupply line has absolutely nothing to do with standing waves and Rueben's Tube effects.

It's due to the impedance (resistance and inductance) in the connecting wire between the Voltage Supply terminal and the load resistor terminal.

.99

Ta Poynty.  Needed to clear up that one.   

[poynt99]

When one compares the Drain vs. Shunt voltage wave forms without and with a 1uH inductance in the MOSFET Source, there doesn't seem to be much of a mystery as to what is causing the coincidental spikes...

.99

[poynt99]

Now let's see if there is any real Joule energy added to the Load Resistor during this apparent 1000W spike....

Nope, apparently not.

.99

[poynt99]

Or is there? 

Indeed, a stop in energy flow would be indicated by a flat line starting just before the 815us mark, but in fact the energy trace begins "decreasing" at this point. The negative energy slope really only means power is flowing in the opposite direction (it doesn't indicate cooling or a decrease), but it is present.

Over one complete cycle (2.5kHz, 3.7% duty) the Load Resistor dissipates a total of 591uJ of energy, of which 38uJ (with a negative slope) is contributed by the spike. So 6.4% of the total Load Resistor energy is added in during the spike.

.99

[Hoppy]

Guys,

The bump on the Vsupply line has absolutely nothing to do with standing waves and Rueben's Tube effects.

It's due to the impedance (resistance and inductance) in the connecting wire between the Voltage Supply terminal and the load resistor terminal.

.99

There is a tiny amount of impedance in all interwiring but this is not causing the bump you show on your waveform. If the interwiring is short, properly terminated and of a suitable guage, then any effects the wiring has can be ignored in this particular circuit.

Hoppy