Giantkiller: I don't see any logic in the proposed switching scheme: I understand that it can be made to oscillate by varying either the inductance or capacitance in a rhythmic manner at twice the frequency of the tank circuit . So we are altering a parameter of the oscillator in the same manner that a child maintains oscillation of a swing by rhythmically altering the center of gravity. For starters, the above statement has a big flaw in the logic. The child supplies energy to the swing but if you just switch an inductance in and out at some harmonic of the lower resonant frequency you are not adding any energy. What would actually happen is when the switch throws the resonant frequency would change because the inductance changed. The initial voltage and current conditions just before the switching would be "kicked" into the new LC tank circuit and it would respond accordingly and operate at a new set of voltage and current conditions. All LC tank circuits oscillate with a pure sinusoidal waveforms. You make a jump from Omega1 at V1 and Theta1 to Omega2 at V2 and Theta2. This is the pure figure skater analogy. They are spinning rapidly with their arms extended out and they pull their arms in suddenly. The rate of their spinning changes almost instantly to a new rotational speed. The switching circuit would do exactly the same thing, irrespective of the fact that you want to switch at a harmonic of the lower fundamental frequency. So what you end up getting is voltage and current sine waves of two different frequencies "stitched" together. Any excitation applied to the original LC tank circuit would decay over time, harmonic switching or not. I have to say though that there is a great potential "lab exercise" for the experimenters here. Test a TPU-type circuit where you properly measure the input and output and also make a timing diagram for it. I am sure you have read the discussions on measurement strategies. Doing a timing diagram would be like taking Spice for you. MileHigh
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Topic: Coefficient of productivity of at least 1? (Read 4636 times)
