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| 1kW 200/400V dc/dc converter design tip |
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| Amper:
The ziptie use is a trademark of equipment from this period, archeologists of the future will use this fact to date back machinery they found in the ruins of the old world. I dont know the exact efficiency but the black heat sink you can see is just a bent piece of 4mm sheet metal, no fins attached anywhere so the loss cant be to great or it would overheat. |
| coppercone2:
i wonder why though? I HATE repairing stuff like that. The only thing worse is wire nylon lashing with wire that is soldered to the PCB. IMO its like avionics grade. https://en.wikipedia.org/wiki/Cable_lacing I don't even know why. I saw a HP supply roll down a hill on a steep road bouncing up and down (extreme abuse due to flying off a car roof). The only weak point was the card edge connectors and the thinner metal on the transformer bracket. It must be related to weird vibrational frequencies. That won't help with gross impact IMO. If you made the transformer bracket 1mm thicker and put some screws on the cards (rather then just press fit into the connectors) it would be perfectly fine. I always wondered if you put some steel zip ties around the card edge connectors if they would hold it without popping the ends off. Even if you had the wires all super lashed your gonna probobly resolder it anyway if it takes a really stiff beating. Does this have something to do with automotive/turbine vibration ? Laser labs typically have seismic provisions.. Does anyone know how the vibration changes when its lashed together that tight? |
| Amper:
I guess it was just easier to put more than to think where to place them. Its a pretty dense cable tree in there with thick wiring that is usually never replaced or modified. They may even have pre manufactured the cable tree externally on a fixture and kept in shape by ziptying the living crap out of it. Some times its even useful when you take out some assembly, take off all the cables and for reassembly you just need o connect them in the place they point to because they are fixed in position that nicely. |
| Benta:
Yep, those wiring harnesses were made on a fixture and mounted as a complete assembly at the end. Standard practice in the 70s...80s |
| Amper:
Yaaay, guessed right ;D |
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