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Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
ZakWolf wrote ...
fixed oscillation. ~2.88MHz.
switched out FET and got much better results ie. less heating. Tried mains and forgot to up my shunt capacitance which im sure cause a huge voltage spike killing the fet and shoring my IXDD frying both of the chips I had.
Ordering new parts..better ones?!? What would cause the IXDD614 to get burning hot olny after ~10 sec operation. I noticed that when the Fres. was below 1MHz the chip ran cool but and more then that and it got HOT fast. Im getting the TO-263-5 okg so I can mount it to the heatsink. Best results were about 1.5cm discharge with 36V unknown amp draw.
I will be back!!
Same boat, the ones I was using popped pretty quick using a set oscillator.. Direct fb lasted longer, but still died... Guessing class E can't depend on Maths alone... Damn Scopes...
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Wolfram wrote ...
What MOSFET are you using? At these frequencies, it doesn't take a huge amount of gate capacitance before the gate driver power dissipation becomes significant.
I used two MOSFETS and
I was able to run the IXFH pretty cool but my drive chip was cooking.
Im going to try these out and switch my IXDD case type to this Its got dat heatsink ability ;)
Also picking up some more multi layer ceramics for greater range in my shunt choice and also grabbing more DC blocking caps so I can experiment with those values more.
This build is strictly to understand and learn how to produce a working and sturdy design.
The RF Choke !?! wtf correct me if im wrong. It builds up a EM field that collapses later after the switched is closed. More inductance causes a larger pulse of energy but Im assuming there is also a limit or at least a desired amount you would want. How to I go about calculating what I need. I have two of these cores Iron Powder Toroidal Cores
Type 2 material, AL=135, U=10 1.06" O.D. x 0.56" I.D. x 0.44" Hgt 2 MHz to 30 MHz. frequency range. Manufacturer-Amidon
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
jdub1581hv wrote ...
Well, 'most' other designs available don't use the choke or blocking cap..?
I still think you should at least try a feedback drive, antenna or current xfmr.. Maybe with a junk fet to test?
I think you're mistaken all "class e" designs employ many capacitors in order to achieve the correct output. The "DC blocking" cap is just apart of tuning the circuit. The RF Choke is the same way. Its lossy so that HF AC doesnt pass through it easily or at all and allows DC to flow easily. How to determine these values im not sure. I wish I new how to to calculate the RF choke, maybe I will build it around the value of my choke, Since its easier to solder caps then rewind a core over and over.
Edit: What I dont get from other designs is that the Class e circuit is tuned to run at a certain power, voltage, and frequency. If you change any of those that effects the tuning. So if you use a any type of feedback it will change the frequency thus changing everything else. I think that would result in more heating than a fixed oscillator and every once in awhile pulling some arcs from it. Since the coil will be tune 99% of the time and only detuned when you pull an arc.
jdub1581hv, you build anything yet ? Pics ? specs?
Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
I guess I should correct myself, What I meant : Thevenin's Theory says you can replace a complex impedance (LC / LCR tank) with an equivalent resistance (heavily paraphrased)
So in the other designs they have already reduced their components to a matching value, which is why I keep referring to Steve Wards setup.. He only has the primary and shunt cap, no RFC/Block cap. This is where my struggle is happening (aside from not having a oscope (-_-) ). Trying to figure out how he got his cap values... He started with 2.2nf shunt (JavaTC value/ calc'd res?) and had to increase to 10nf to achieve class E. Also he is using an antenna for fb. Feedback from Sec. coil shouldn't cause problems, from what I understand, it keeps the current 90* out of phase with primary and will be in resonance with pri tank .. Like a Slayer Exciter. Then you would want to run the tank slightly above resonance so that when you pull a load(arcing) it brings the circuit into proper resonance lowering frequency when a load is present. I Could be completely wrong and hope I get corrected if so..
Another example from the forums here: Author: Perezx Original Thread
I 'did' have pics, I got hacked and had to reinstall my OS .. Had no way to save ANYTHING >!< all my pics, programs, arduino projects, javafx projects... I do have a pic on phone of coil I'm working on now.. (Ditching class E till I can get a scope) Dimensions: 6" X 24" X 1600t #28 wire Res Freq : 145khz with topload(upper one), 165+/- khz without
Registered Member #39190
Joined: Sat Oct 26 2013, 09:15AM
Location: Boise National Forest
Posts: 65
Claude wrote ...
Sorry,this is the updated schematic that I used. You don't have to use the audio modulation if you don't want to.
Claude.
Don't know German but the schematic seems to indicate that the secondary is 5cm in diameter and a mere 7.5 cm long. With these diminutive dimensions and a 4MHz operating frequency, what sort of brush/spark discharge does it produce?
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Class E? Class E...
