After calculating the delta I(inductor) for a forward converter, I've decided to switch to a full bridge topology. Although this introduces transient...
Have you thought about using a furnace ignitor as the source? They have built-in sensors and such. Of course, they may not handle being hooked up next to the...
... I'm not an EE so no real comments on the circuit. I wonder though, would it be useful to have a general discussion about how plasma cutters work in...
... about how ... metal ... The electrode in a plasma torch is actually inside the torch itself (negative). The metal cup on the outside is the HF/HV...
Since you went to all the work to post your schematic, I'm guessing that you wouldn't mind some contstructive comments. First of all, I'm glad you decided...
... Of course not. Actually, I was hoping for feedback on the design. ... Curiously enough, the Lincoln and the Harbor Freight both use dual transistor...
Includes MOSFET snubber and gate drive transformer, nothing on page 3 yet (GDT drive). Changes: Relay instead of SCR for inrush current limiting Fixes: P...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the ohpc group. File : /schematics/v1.1 ...
ohpc@yahoogroups.com
Mar 20, 2006 4:59 am
25
The baby went to bed early tonight so I actually had a few minutes to get online! I see that you are starting to think about driving your MOSFETS! Have you...
... Not yet, although I hoped we could get by using a surplus MOSFET, but I will start to look soon (starting with your recommendations). The nice thing with...
... Alright, Of the three MOSFET's you suggested, the second (IRFP31N50L) looked most suitable. The first was lacking as far as current and thermal ...
Started work on the controller, values for R_LEB, R_DPRG, and R_SLOPE still need to be calculated Changes: Shunt for current sensing instead of hall effect...
Have you looked at using a high side gate drive IC (IR2113 $2.86). You don't have the issues with flux walk using a gate drive IC. I don't see anything at the...
... You don't have the issues with flux walk using a gate drive IC. ... Always thought it was more trouble than it was worth (high side gate drives)....
Fairchild Semiconductor is fairly liberal with their IGBT samples. www.fairchildsemiconductor.com I think. I have gotten a bunch from them, free Fedex 2 day...
Yes, yes...I know, the site is unprofessional and the prices are abnormally cheap (don't worry, they make up for it in the handling) but, I'm going to order 2...
No way! I used to live like a mile down the road from that place! They've been there for years and I never even knew what they did. Wow, you learn something...
... I did some calculations, and 4 turns on the primary seem about right with 3.5 on the secondary. The OCV will float high when the inductor reaches DCM. At...
Created the board are with WinQCad. Autorouting is pretty good, had very few issues. Although it could be a ground plane, the datasheet says it could be...
I just found this group, joined, and read through all of the posts. This is something that I also have been interested in for a while. I built a simple plasma...
... What did the schematic look like? Was there an inductor/rectifier/capacitor involved, or just straight off the line with a resistor in series? The project...
I'm interested in those schematics, as well as any photos you have of it working, assembly, etc. Thanks Dave Saltspring ... From: ohpc@yahoogroups.com...
I'll see if I can figure out how to upload the docs I have so others can see them. I am interested in the inverter. I went to the US Patent website and did a...
I created a directory called "patents" and uploaded the patents to it. I also uploaded a PDF of the design for the plasma cutter I am currently using. One...
... The power factor correction (second one from the top) may be useful. It's nice to be able to copy other peoples' patents without worrying about litigation,...
... Just finished a more recent version, using the much simpler dual forward topology and tl494 controller. It's at files/schematics dual forward/dualfwd...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
