Hi all.
I have an idea on which I need your opinion.
From the experiments with water spark plug circuits we know that it is possible to combine high voltage and low current with high current and low voltage and get high voltage and high current. This has been verified many times with many different circuits. The basic circuit that Aaron showed is shown here:
It uses a booster capacitor that is charged up to some 200-400V, this is then discharged through the thin thread of plasma, produced by the ignition coil. Result is a loud HV plasma discharge. So we know that both sources of energy (low voltage high current and high voltage low current) can be combined.
Now, lets look at LC resonance types. We have two types of resonance - series resonance and parallel resonance. Series resonance gives us increased voltage in the LC circuit which can be measured with a multimeter or seen with a scope. Parallel resonance gives high current in the LC circuit with almost no change in voltage, this can be measured with a sensing coil and a scope. So lets say we two LC circuits, one at parallel resonance and other at series resonance. And lets assume that their frequencies are the same and the phases match. Now we should be able to combine the high voltage from the series LC circuit with the high current from the parallel LC circuit just like this can be done in water spark circuits. Right?
Now, lets look at Don Smith's setup:
He has a high voltage primary LC circuit in parallel resonance. This is to excite the secondary part. Of course the primary capacitor is matched with the primary coil to resonate at the frequency the neon power supply puts out, this is to get the maximum energy transfer to the secondary part of the circuit. Now lets look at the secondary part. We have two inductors and a capacitor arranged in a interesting way. One inductor is parallel to the secondary capacitor and other inductor is in series. What does this mean? We have two resonance types in the secondary part - series and parallel, this means we have lots of voltage and lots of current. The best part is that the inductors are the same and thus resonate with the capacitor in the same frequency. Both resonances are in phase.
You know like Tesla coils have always high voltage on the top terminal of the secondary coil and the most current on the bottom grounded terminal? Here Don takes advantage of that fact getting voltage from one coil and current from other coil through the diodes to the last capacitor that stores the energy. The parallel LC coil might need to be wound in opposite direction. Also this concept makes it clear why by changing the position of the primary coil in respect to secondary part can adjust the output voltage and current. It all depends to which coil in the secondary part you give most of the energy, if the primary coil is put into the center of the secondary parallel resonance coil, then you will get lower voltages and higher current on the output. If the primary coil is put in the center of the secondary series resonance coil, the output will be of higher voltage and lower current.
So this is the proposed circuit:
Primary side needs to be in resonance. If your HV power supply has a set frequency that can not be changed, then you need to adjust the C1 and L1 value to match the LC frequency to that of the power supply. On the secondary part, L2 and L3 need to have exactly the same inductance, and C2 has to have a capacity so that the secondary part oscillates at the same frequency as the primary part. The C3 is just storage capacitor, needs to be rated for HV and high capacity.
So any thoughts? Seems very straight forward to me.
Thanks,
Jetijs
I have an idea on which I need your opinion.
From the experiments with water spark plug circuits we know that it is possible to combine high voltage and low current with high current and low voltage and get high voltage and high current. This has been verified many times with many different circuits. The basic circuit that Aaron showed is shown here:
It uses a booster capacitor that is charged up to some 200-400V, this is then discharged through the thin thread of plasma, produced by the ignition coil. Result is a loud HV plasma discharge. So we know that both sources of energy (low voltage high current and high voltage low current) can be combined.
Now, lets look at LC resonance types. We have two types of resonance - series resonance and parallel resonance. Series resonance gives us increased voltage in the LC circuit which can be measured with a multimeter or seen with a scope. Parallel resonance gives high current in the LC circuit with almost no change in voltage, this can be measured with a sensing coil and a scope. So lets say we two LC circuits, one at parallel resonance and other at series resonance. And lets assume that their frequencies are the same and the phases match. Now we should be able to combine the high voltage from the series LC circuit with the high current from the parallel LC circuit just like this can be done in water spark circuits. Right?
Now, lets look at Don Smith's setup:
He has a high voltage primary LC circuit in parallel resonance. This is to excite the secondary part. Of course the primary capacitor is matched with the primary coil to resonate at the frequency the neon power supply puts out, this is to get the maximum energy transfer to the secondary part of the circuit. Now lets look at the secondary part. We have two inductors and a capacitor arranged in a interesting way. One inductor is parallel to the secondary capacitor and other inductor is in series. What does this mean? We have two resonance types in the secondary part - series and parallel, this means we have lots of voltage and lots of current. The best part is that the inductors are the same and thus resonate with the capacitor in the same frequency. Both resonances are in phase.
You know like Tesla coils have always high voltage on the top terminal of the secondary coil and the most current on the bottom grounded terminal? Here Don takes advantage of that fact getting voltage from one coil and current from other coil through the diodes to the last capacitor that stores the energy. The parallel LC coil might need to be wound in opposite direction. Also this concept makes it clear why by changing the position of the primary coil in respect to secondary part can adjust the output voltage and current. It all depends to which coil in the secondary part you give most of the energy, if the primary coil is put into the center of the secondary parallel resonance coil, then you will get lower voltages and higher current on the output. If the primary coil is put in the center of the secondary series resonance coil, the output will be of higher voltage and lower current.
So this is the proposed circuit:
Primary side needs to be in resonance. If your HV power supply has a set frequency that can not be changed, then you need to adjust the C1 and L1 value to match the LC frequency to that of the power supply. On the secondary part, L2 and L3 need to have exactly the same inductance, and C2 has to have a capacity so that the secondary part oscillates at the same frequency as the primary part. The C3 is just storage capacitor, needs to be rated for HV and high capacity.
So any thoughts? Seems very straight forward to me.
Thanks,
Jetijs
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