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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Will.S.L.Liu wrote ...
well....I am pretty sure that non of the MOSFETs are wired wrong ....the MOSFETs are IXFK44N50.
I am using the same PCB as the guy named Quinn above...he is my friend...he already get the correct waveform....
the problem is I have got the correct waveform before which is using 24 AWG Magnet wire, the waveform comes out perfectly, but the problem is that wire started to get so hot after 50VDC and broke two of my toroids already....but the waveform comes out really nice....I checked my PCB for more than 10 times ....don't think any of the MOSFETs are wired wrong.... I know is so strange, I have already working this for more than 1 month with some of the professors in my school.... really don't know why .....
Actually, you just mentioned your best method for finding a solution.
If you're friend has the same design / board / MOSFETs as you are using, and he has the correct waveforms, the easiest way to go about troubleshooting yours is to compare it to his. Make sure all components are installed correctly, the transformers are built right, etc...
Registered Member #2743
Joined: Fri Mar 19 2010, 01:59AM
Location:
Posts: 9
we are using our own board design, but he is in china and I am in Canada~! but I will try my best to see what I can do ~! I bought some wires today and I will go ahead and give an other try~! If it is still not working ,I think I may have to do the entire board again...
Mr. Steve mentioned that I should use a light bulb, what kind of light bulb should I use?! I have one is 75W 120V, is that going to be enough power to handle?! and I really don't know that I shouldn't scope two of the gate signal.....and I know I was stupid.....well....could you please tell me what could happen if I did scoped the gate signals with power applied?!
Registered Member #2743
Joined: Fri Mar 19 2010, 01:59AM
Location:
Posts: 9
Hi Dr.
I think you are right ~! Thank you so much!!! I connected my 75W 120V light bulb as the load, and it seems working. I took three pictures of different frequencies and they are a little different from the waveform that should be. the falling time of the pulse is not really straight...it is more like slide off from the top and not really end up with 0V...Do you think that may be the light bulb didn't get enough power to draw the current from the circuit?! if I have my resonator coil connected, will that falling time be more straight down to 0V?!I was hoping to run it at around 300KHz which is the second picture.
I was also wondering if I can have my primary coil inside my secondary coil, just make it look better. Can I do that ?!
BTW, is that possible to monitor the music signal on the scope as the music signal applied to the circuit?!
Thank you so much Dr.s~!
here are the pictures which is 500k, 300k, and 100k.
Registered Member #2743
Joined: Fri Mar 19 2010, 01:59AM
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Posts: 9
Dr.~! I just find out something that I don't know if it is right or wrong....The pin 7 and pin6 of the four TC4422s from the SMPS are not that good ....I took two pictures at 300kHz, the problem I see is as the frequency going down, the two TC4422's waveforms on the Q1 and Q2 side are getting better; as the frequency going up, the other two's waveform gets better.....is that suppose to happen..?!the top one is the Q1 and Q2 side~!
Registered Member #2743
Joined: Fri Mar 19 2010, 01:59AM
Location:
Posts: 9
Hi Dr.~!
I got some news, here are some of the waveform that I took today~! it looks really good ~!
but the new problems are coming, ( actually, I have seen this kind of problem before.) as the lower frequency, the waveform looks so good ~! as the frequency goes higher, the falling edge start to slide off... that should be ok through cuz I am going run it at 230khz~!I already had my resonator which i measured is 230khz.
ok~! here is my big problem ...as the voltage of the Full-bridge circuit going up(more than 40VDC), the graph start to getting narrower.. which the first time I got this kind of problem end up with the wire on the toroid gets so hot after the waveform gets narrower, and the wire burned and the toroid was broken....
Have you every facing this kind of problems ?!
is it because the load I am having is not powerful enough or there are some thing else is wrong!?
I really don't wanna just running it below 40VDC...
Thank you so much ~!
Here are the waveform that I took today by using the differentiation method~! (REF: loaded a 120V 75W light bulb, and the Gate wave looks really good before apply voltage.)
Followed by: 100kHZ; 300KHz; 500Khz; and 300KHZ with voltage go over than 40VDC.
Registered Member #1524
Joined: Sun Jun 08 2008, 05:25PM
Location: Grand Junction, Colorado
Posts: 38
I just started looking into the plasmasonic II.
Would it be posable to switch from pull pull operation to single ended operation with a switch?
And lastly could a miniBrute primary and secondary be used following the same basic build information and kit contents?
I think it would be really neat to switch from the base miniBrute to Plasmasonic II all in the same single build. Only needing to change the top-load and primary tap.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
I think a switch could work here, but you wouldn't want to use it while its running as who knows what will happen with switch bounce. You could get some noise out of the TL494 which could have your top/bottom FETS in the bridge conducting at the same time and POOF! or rather BOOM!
The miniBrute could be used, but the coupling relatively low compared to the standard Plasmasonic design so the arc output would substantially be decreased.
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Plasmasonic II build
