Junkyard visit

2020-2-22

Yesterday I was at a junkyard where I found 2 CM75DU-12F IGBTs.
IGBT on some tissue paper
IGBT on some tissue paper

They are rated for 75 A at 600 V and have a driver board, which should be usable with some modification for an induction heater or similar. They came from an AC inverter, of which one PCB had a big black burn and an electrolytic capacitor had leaked on it, which probably was the cause for the damage. I wasn't able to test them yet because they have a 2.2 k resistor on their gates and I only have a multimeter right now, but I think they're fine. The driver board has output stages made from two transistors and has a galvanically isolated supply for each gate of 15 V. It seems to have current mode controllers on it, though I am not sure how exactly they are configured. The optocouplers on it are only rated for 25 kHz so that will require some modification.

I took some server CPU voltage regulators and a fiber-optic SMA to some mini BNC cable, I have no idea what these could be used for yet.

There was a bin with smashed capacitors
Four smashed capacitors on top of some transformers and coils. One of the labels is readable, they're 3x 115.1 µF at 3 kV, self-healing and dry. A bit above that it says 21 kVAr at 440 V and 17.5 kVAr at 400 V 50 Hz.
Four smashed capacitors on top of some transformers and coils. One of the labels is readable, they're 3x 115.1 µF at 3 kV, self-healing and dry. A bit above that it says 21 kVAr at 440 V and 17.5 kVAr at 400 V 50 Hz.

Those capacitors could store approximately 1.5 kJ each, but sadly they were completely crushed.

There was a bin with broken lead-acid batteries which smelled like sulfuric acid.
Broken lead-acid batteries in a plastic lined steel pit
Broken lead-acid batteries in a plastic lined steel pit
More batteries
More batteries


I also took a control unit for a xenon lamp, it had some inductors or transformers in it. I didn't inspect it any further yet.
Yesterday I was at a junkyard where I found 2 CM75DU-12F IGBTs.
IGBT on some tissue paper
IGBT on some tissue paper

They are rated for 75 A at 600 V and have a driver board, which should be usable with some modification for an induction heater or similar. They came from an AC inverter, of which one PCB had a big black burn and an electrolytic capacitor had leaked on it, which probably was the cause for the damage. I wasn't able to test them yet because they have a 2.2 k resistor on their gates and I only have a multimeter right now, but I think they're fine. The driver board has output stages made from two transistors and has a galvanically isolated supply for each gate of 15 V. It seems to have current mode controllers on it, though I am not sure how exactly they are configured. The optocouplers on it are only rated for 25 kHz so that will require some modification.

I took some server CPU voltage regulators and a fiber-optic SMA to some mini BNC cable, I have no idea what these could be used for yet.

There was a bin with smashed capacitors
Four smashed capacitors on top of some transformers and coils. One of the labels is readable, they're 3x 115.1 µF at 3 kV, self-healing and dry. A bit above that it says 21 kVAr at 440 V and 17.5 kVAr at 400 V 50 Hz.
Four smashed capacitors on top of some transformers and coils. One of the labels is readable, they're 3x 115.1 µF at 3 kV, self-healing and dry. A bit above that it says 21 kVAr at 440 V and 17.5 kVAr at 400 V 50 Hz.

Those capacitors could store approximately 1.5 kJ each, but sadly they were completely crushed.

There was a bin with broken lead-acid batteries which smelled like sulfuric acid.
Broken lead-acid batteries in a plastic lined steel pit
Broken lead-acid batteries in a plastic lined steel pit
More batteries
More batteries


I also took a control unit for a xenon lamp, it had some inductors or transformers in it. I didn't inspect it any further yet.




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