| Electronics > Projects, Designs, and Technical Stuff |
| Homemade IGBT MIG welder with ATX PSU parts. [blown yet again][blown count: 5] |
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| SiliconWizard:
--- Quote from: Refrigerator on August 14, 2019, 07:03:16 pm ---I've since blown the welder up two more times. >:D --- End quote --- Congratulations! :P |
| strawberry:
there is no 2.5 |
| coppercone2:
been waiting like 3 years to power up my IGBTs, looks like I made the right call doing nothing |
| SiliconWizard:
--- Quote from: coppercone2 on August 15, 2019, 05:51:09 am ---been waiting like 3 years to power up my IGBTs, looks like I made the right call doing nothing --- End quote --- As an old colleague of mine used to say: "it's urgent not to do anything". ;D |
| Refrigerator:
Tested the welder but not fully. Seems either i made a mistake when rebuilding or the previous failure did more damage than expected, because at a certain input voltage the MOSFET half bridge starts oscillating. Above 130VAC if i pull and release the trigger the MOSFET half bridge starts oscillating at around 90kHz, while my switching frequency is set to 50kHz. I think i'll remake the MOSFET board and if that doesn't help i'll remake the TL494 board along with the GDT. Otherwise everything seems to be looking pretty well so far. Under no load output reaches 19V at about 130VAC input and with a 1.3-ish Ω load it maintains 14V, which might be limited by the input voltage. With the 1.3Ω load at 14V the ripple on the output is 1.4VRMS I haven't yet tested the welder on anything above 140VAC because i fear it might blow up. Also my variac is only rated up to around 300W and starts buzzing pretty loud on anything above 1A. After operating with the said load for a few minutes all of the heatsinks are cold. |
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