... dual ... circuit, ... add a ... some ... but ... VERY ... will ... Looks great. What frequency are you switching the FETs at? And, what will it take to...
... OK. Looks like about 50KHz huh? If you ran higher frequency, you could use a smaller tranformer, right? Also, a smaller L1 and C4. It looks like D3 and...
... 35-40 amps will most likely require PFC, even with a high current 240V service. ... Ooops...seems I forgot about that, easy fix. ... Shipping here to the...
... Although the frequency could be higher, transistor losses would increase, because the time in the linear operating region would increase. Gate transformer...
... 240V ... And, I presume, heavier wire in the transformer and appropriate FETs, right? Or are you designing for higher currents but running at only 20...
... Yes, I'm going to design the power components to work with 30 amps, and the controller to work with 20 amps. After testing, the controller will be...
... controller ... You're in the US? If so, your house is already wired with both legs, and you just need a circuit breaker, some 10 or 12 ga. solid wire, and...
Actually, you need to get the 10/3 wire and wire the red and black to the 2-pole circuit breaker, the white to the neutral buss bar and the green to the...
... to the ... green to ... single ... meet." ... I'm not really sure about code wiring, so I would be hesitant to do anything against my home's insurance....
Yeah, the 2-pole breakers feed from both sides (phases) to get the 240V. Technically, you have to get a permit and have it inspected. Around here, you can...
... There's no ... have .5 ... with ... I have about a 10 second post flow to cool the tip (I got that number from the data sheet for a commercial unit). If...
I created the boardart for the main PWM controller, mainly to demostrate how simple the controller is. The GDT is not included, because they should be as close...
I looked through the links you posted, and I think I'll try to build an H bridge design with power factor correction. I really want more amps that you will...
... I just got an email from her (the PSU manager). She said there were several issues, and she wants to discuss it further with me when I get back from...
... Oops. Most of what I learned about SMPS came from app notes and online sources, which might explain a few mistakes. Would love to here about the problems,...
... The extra circuitry can be similar. The original idea of an H bridge was abandoned because of the extra components and complexity of ZVS, both of which...
... Have you used the Harbor Freight unit? I haven't, but my experience with many of their products has convinced me that their claims may not always be...
YAHOO! groups strip attachments, so you all should be safe from this threat but, If you use YAHOO! an email account, there is a new virus (worm) going around,...
... No, but I had a HF compressor blow a cheap plastic line this weekend. I couldn't agree more about their claims, but how much 1/2" material can someone use?...
Here's some notes on the schematic: Q1 should be an NPN transistor. Keep emitter where it is. The three mosfets on the transformer page need to have their...
... Don't remember what I was trying to do there...Then I realized the internal transistors can source 400 ma combined, which should be enough for two GDT's...
Found a free pic basic compiler (xcsb) and wrote some code for the plasma cutter controller. Before you laugh too hard, remember it was late at night when I...
... You'll need to some very good shielding, and serious filtering of wires going to the PIC or it will go nuts when the high frequency stuff starts. Speaking...
... http://en.wikipedia.org/wiki/Category_6_cable The compiler has a built in debounce routine, so if I ever figure out how it works (damn dependencies), that...
... Any updates? I finished a prototype HF/HV starter, but haven't tried it on the torch yet. Arcs maybe 1/8"? I think with some tuning it can get longer. Also...
... source ... there is ... try to ... tried ... can ... Ah, sorry, no she didn't have any other comments. She hasn't actually used the TL494 before....
After realizing just how little real power you can get out of a non-pfc SMPS (~.6 pf for other plasma cutters), we should really look at PFC (like yellow73bb...
... Finished the PFC section and uploaded it to the files. PWM will come next. The design is for 120/240 selectable input, with 110 20 amp output. Switching...
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