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Registered Member #4465
Joined: Wed Apr 18 2012, 08:37AM
Location: Bucharest, Romania
Posts: 145
Andy wrote ...
The parts for this are quite cheap to muck around building it, in a while should have a prototype built and tested. If anything is wrong with the circuit, wouldn,t mind feedback.
You can’t use this setup. There’s no way to use capacitors for isolation purposes in alternating current circuits. By the way, try a search for 50nF-100nF/ 30KV capacitors, in order to get some idea about the capacitors volume.
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
Andy wrote ...
Been spending sometime work out a way to get high volts with a high frequency, trying to find a way that will injuice large current throught the water as that has reached a bottle neck. The below circuit is driven from main voltage and frequncy, with a h bridge setup to slice the ac up. For isolation between stages are 30kv 100nf cap network on both plus and minus. The zeners are rated for 10 volt, the transfomers are pulse types with the values taken from the datasheet, one is 50hz 0.8ohm the other 60khz at 80mohm.
The parts for this are quite cheap to muck around building it, in a while should have a prototype built and tested. If anything is wrong with the circuit, wouldn,t mind feedback.
You cannot isolate the MOSFET grounds from the trigger transformer with 10k resistors. It will have to be directly connected. The capacitors in between the trigger transformers and the gates of the MOSFETs are useless and will probably block the signal, depending on the frequency. There is no reason, as far as I can see, why the trigger transformer cannot be directly connected to the gate and the source of the MOSFET, as this is what they are for.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Hi, the capactors are to block dc, for the transfomer voltage between windings pri/sec is one kv, if I syack multiable blocks, the voltage for the first block will be 340volt, but after 20 will be 6.8kv, it should be dc and get blocked by the caps rather than short the transfomer, go along the track an short anothe transfomer and then neutrilze. Thanks about the ground resistor, I think I needed that to get the sim to work, but can you explain why its retaianted. Cheers
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
Andy wrote ...
Hi, the capactors are to block dc, for the transfomer voltage between windings pri/sec is one kv, if I syack multiable blocks, the voltage for the first block will be 340volt, but after 20 will be 6.8kv, it should be dc and get blocked by the caps rather than short the transfomer, go along the track an short anothe transfomer and then neutrilze. Thanks about the ground resistor, I think I needed that to get the sim to work, but can you explain why its retaianted. Cheers
Ahhh, so, if I understand correctly, the transformers are all the same transformer, and each of the secondary windings outputs are taps of of one secondary. That would require blocking caps. However I would still be concerned about feeding the MOSFETs with AC: if you give them too much reverse voltage on the gate they tend to fail. That may be why you needed those resistors (and the zener).
I am still a little confused about the resistors R3 and R7 (the ones on the input mains) they seem rather high value and surplus to requirements.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
The r3&7 was just to limit the current to 25&50&100mA, it was 6.4kohm, but the sim needed a resistor on the primary of the circuit. The parts current handling as being updated to high values. Based on another thread and water has a high constant of about 80 was thing something like below. Think that magnetic feilds are one million times stronger than electric, that I could use the electric feild produce more power with water coils.
Edit thanks about the reverse voltage of mosfets, will put a forward direction diode to limit that.
Registered Member #54012
Joined: Thu Dec 18 2014, 12:46AM
Location:
Posts: 2
Okay here is a disclaimer- I haven't studied anything on this particular subject so keep that in mind regarding this suggestion.
I do understand a little about what you are trying to do. First, you are going to incur a substantial energy loss in the conversion between linear to rotational energy. Here is a suggestion: There are several schematics floating around for an Oxy-Hydrodgen Torch, which basically breaks down water into the atomic components using microwave RF to assist in the breaking of the molecular bonds. These components are then recombined at the torch tip to create a localized high temperature combustion. Check out some of the videos.
Would it make more sense to try this concept and use the gases generated to run a turbine or could the gases be used to pressurize the water with in injector to create your mass flow? I believe this process either requires a microwave tube or an antenna that emits the microwaves responsible for decreasing the energy required to break the oxy-hydrogen molecular bond. Perhaps passing the water through two electrodes subjected to HF RF would work also.
A big question relates to the energy input equation/balance and the gas generation rate. The circuitry involved however is simple in design and the torch is seemingly economical to operate. Saltwater may also enhance or retard the process.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Hi silverfox, was thinking off a ,200mhz tranistor at 5 kv but will piss o many people with rf interference. Looked up water tourchs, but apart from the heat injected will only top 10% eff.got a circuit that should top 100khz and drop in eff after that, but will supply high voltage high current, but will be using dialectic heating type system, but not as heat
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
This is going to be very, very inefficient.
Fun though.
Turning a turbine with it should be significantly more efficient though; but still awful.
(Electric motors produce relatively little thrust for a given power, but at high enough speed that still represents high mechanical output power- that's why electric motors are nearly always run at high speed and geared down, using a turbine would effectively give you some gearing).
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