For this experiment I simply cut out the transformer. I used the primary winding as part of the tank circuit and placed the bridge and WFC between the tank inductor and tank capacitor.
The goal was to eliminate the losses of the transformer in this design.
This is for a single cell with plenty of KOH again.
Input voltage is read off the variac, while secondary voltage is measured at the tank capacitor.
V = volts
C = current
P = power
F = frequency
First setup Tank cap 4.5uf
Input V Input C Input P(W) Output A Output F
7 1.9 13.3 2.4 4.6 k
23 3.2 73.6 8.1 5.3 k
30 5 150 13 6.9 k
40 7.6 304 18.8 8 k
To lower the frequency and see what changes may occur I added to the primary cap.
Tank cap 9.0 uf
Input V Input C Input P(W) Output A Output F Output V Circulating P (W)
12 2.9 34.8 4.8 3.3 k 30 144
17 4 68 8 3.8 k 49 392
20 5 100 10.5 4.3 k 57 598.5
26 8 208 16 5.2 k 65 1040
33 11 363 23 6.3 k 81 1863
At 23 amps on the cell side I smoked my wires to the cell. Planning on looking over this data awhile.
I am expecting as the ionization energy of the molecules is reached (next level) the cell resistance should drop, therefor allowing the cell current to clime higher and allowing the input current to lower.
I am thinking I am starting to see the affect, but might be seeing what I want. I know the plasma electrolysis seems to happen at 200 volts - so my goal is to see the input power required as the secondary hits the 200 v mark and above. My driver is not made to handle above 200 volts so some updates will be necessary.
One disappointment, and hole in the theory already, is the primary current continues to clime as the voltage is increased. The losses of the tank circuit should be fixed - therefor raising the voltage should not affect input current.
I am thinking this is my driver (partly) at higher voltage and some skin effect at the higher frequency.
Frequency should be the same regardless of voltage input, because the tank Inductance and tank capacitance do not change.
I guess this means the losses of the cell are less at higher voltage - assuming higher freq. represents less energy drop as a camera flash circuit works. (as the load diminishes, capacitor charges, the frequency of the camera flash circuit rises until beyond 20 khz, audible range).