Author Topic: Where To Get "Free" TO-247 IGBTs and MOSFETs  (Read 297 times)

Offline Mads Barnkob

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Where To Get "Free" TO-247 IGBTs and MOSFETs
« on: July 31, 2022, 08:57:46 PM »
A look at a box of IGBTs and MOSFETs that I have salvaged from household electronics like microwave ovens, induction stoves, solar inverters, welding machines, car and battery charges and other common high power electronics with switching inverters.

Do you have any sources for salvaging IGBTs / MOSFETs that is widely available from "household" items?

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Offline ZakW

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Re: Where To Get "Free" TO-247 IGBTs and MOSFETs
« Reply #1 on: July 31, 2022, 10:27:33 PM »
Hey Mads,

I don't have a household source but I am fortunate to work for an ISP in my area. I am friends with the warehouse who handles recycling old equipment so every now and again i go take a look at what they have. There is usually a huge crate (5ft cubed) full of all kinds of PCBs. I have built up a nice stock of heasinks, MOSFETs, and misc diodes.


Offline Max

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Re: Where To Get "Free" TO-247 IGBTs and MOSFETs
« Reply #2 on: August 02, 2022, 07:36:07 PM »
As I commented on youtube, SMA solar inverters are popular here around. The models that are now slowly being retired/failing (a.k.a. the stuff that shows up for cheap or free) are just full of salvageable parts. Unfortunately, more recent models seem to be less salvage-friendly; f.ex. one we got installed in our house has the heatsink integrated into the casing. They're also noticeably smaller now.
Anyways, those older ones only contain the good, expensive name brand stuff. TI opamps, Avago opto-isolated gate drivers, big made-in-germany inductors, huge heatsinks, silicone cables, WAGO connectors, ... Even the unisolated faston crimp contacts all the wires give you immediately a feel of quality (it's the type with latch like these).
Also, all SMD parts on all PCBs were conformally coated.

Below the picture I included a list of everything I salvaged out of a 4 or 5kW unit whose bus capacitors blew up (MOSFETs and IGBTs seem fine). I didn't do any sort of reverse engineering but it is interesting to note that the main inverter apparently uses 1200V MOSFETs, not IGBTs.

Kind regards,
Max




  • Passives
    • Bunch of good quality WIMA and EPCOS foil capacitors (top right)
    • 4x EPCOS 680uF 450V (possibly bad condition, since some of them blew up (cf PCB))
    • 3x 2x2.8mH 10A 250V EPCOS Common Mode Choke Product Link
    • 3x "small", 2x large inductors - all made in germany by SMP. The small ones are likely associated to each of the three solar DC inputs, the larger ones likely related to the single phase AC output. Based on another, similar inductor from another SMA unit, the big inductors are in the ballpark of 2mH 25A.
  • Sensors
  • ICs
    • Bunch of logic ICs (74HC/AHC)
    • 7x LM258 OpAmp Dual 700kHz GBW
    • 3x TI TL084 Quad OpAmp JFET 3MHz GBW Product Link
    • 8x LM293 Comparator Dual
    • 3x TL2843 Current Mode PWM Controller Product Link
    • 3x HEF4066BT Quad SPST Analog Switch Product Link
    • 4x SFH6156-3 Opto-Coupler Product Link
    • 4x Avago HCPL-J312 2A Optio-Isolated Gate Drivers Product Link
    • 3x IR4427 Dual Low-Side Driver Product Link
  • Power
  • Misc
    • Clips for mounting the TOxxx power semiconductors to the heatsink standoffs. These weren't cheap either I'm sure.
    • 2x Massive heatsinks - about 20cm x 50cm
    • 6x EPCOS Varistor (625Vrms 6.5kApk) + Thermal fuse (3A 250V 102°C)
    • Bunch of massive WAGO PCB Connectors
    • Bunch of nice silicone cables with "solar" connectors
    • Some wires with high quality crimp contacts (these faston crimps were probably 20-30 cent each in bulk).
    • 4x Panasonic Relay SPST-NO 250V 20A (9V coil)
    • 1x 16x2 character LCD module (no backlight).
« Last Edit: August 02, 2022, 08:58:15 PM by Max »

Offline Mads Barnkob

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Re: Where To Get "Free" TO-247 IGBTs and MOSFETs
« Reply #3 on: August 04, 2022, 08:50:24 PM »
As I commented on youtube, SMA solar inverters are popular here around. The models that are now slowly being retired/failing (a.k.a. the stuff that shows up for cheap or free) are just full of salvageable parts. Unfortunately, more recent models seem to be less salvage-friendly; f.ex. one we got installed in our house has the heatsink integrated into the casing.

That is an impressive amount of good stuff in one unit.

I agree on the whole-cast being shite thing. I dug through a pile of maybe 20 solar inverters and only 5 of them even had TO-247 IGBTs, rest were multi phase bricks or press-fit skiip modules. Heat sinks are cast as part of the chassis, with DC bus capacitors and inductors imbedded into it with epoxy. Its complete trash to the metal scrappers as its now a whole unit of electronics waste and they cant get the heat sink or inductors "out".

Legislation is properly so badly made that when manufacturers have to assure it will be recycled, its not necessarily recycled in a smart, re-useable or low energy cost way. It is just possible.
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Offline TMaxElectronics

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Re: Where To Get "Free" TO-247 IGBTs and MOSFETs
« Reply #4 on: August 08, 2022, 09:50:49 PM »
I found it very helpful to just search ebay for the big IGBT manufacturer names from time to time. I found everything from skm200 bricks for 5€ to an entire 400A VFD output stage which included a 20kg heatsink, 12 electrolytic caps and 6 SKM300 halfbridges for 5€ :)

Same thing goes for electrolytic capacitors, even the big ones can sometimes be found for als little as 2,50€.

Oh and regarding salvaged IGBTs from induction cookers: you can just use an induction cooker powerstage directly for a tesla coil. Thats how I got started building coils ;D

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Re: Where To Get "Free" TO-247 IGBTs and MOSFETs
« Reply #4 on: August 08, 2022, 09:50:49 PM »

 


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