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microwave inverter as power supply

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LAN_403

jameselectric

Fri Oct 26 2007, 04:59AM

Registered Member #535 Joined: Sun Feb 18 2007, 06:03AM
Location:
Posts: 65

To much my suprise I pulled an oven apart and it has the inverter setup. This is my first encounter with one of these. Can I rectify this and make a solid state coil. Will I be able to mount everything underneath the coil or will the eddy currents and all that wreak my supply? My six inch coil is everywhere I would like to have a smaller neater one to take around.

Dr. Dark Current

Fri Oct 26 2007, 08:21AM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

You can easily make a CW multiplier to get higher voltages out of the transformer at this frequency, but I think the main problem is that it's not current limited- you will probably blow something if you put it to TC duty.

quicksilver

Tue May 20 2008, 10:14PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

I just came into one of these inverters from a MO and it appears to be very flexible IF the correct engineering issues were dealt with. Please understand that my electronics background is extremely limited. But this thing seems to be a goldmine of materials.

From looking it over it seems a standard line voltage input then a very interestingly designed coil similar to flyback construction and rectification; but AC out (?)
The IC's are massive but it appears to maintain it's 60hz for the magnetron.

What are some of the things people have done with them? It seems a shame to use them for spot-welder when such a wealth of parts exists.....

Kristian

Tue May 20 2008, 10:56PM

Registered Member #611 Joined: Wed Mar 28 2007, 11:40PM
Location: Hudsonville, Michigan
Posts: 79

I have two of these inverters also. I have no idea what to use them for. They are just taking up shelf space right now, at least until I find a use or find someone else with a use for them. If anyone has done anything TC related with these, could you post a schematic or description? Or if anyone has a plan or idea and needs one or both, I would let them go for postage. Shoot me a private message and I'll hook it up.

teslacoolguy

Wed May 21 2008, 12:04AM

Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
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Posts: 792

I know i am not a moderator but remember the rule about asking for schematics but anyway TDU made a 4kv supply with a MOIT

MOT_man

Wed May 21 2008, 01:59AM

Registered Member #1127 Joined: Mon Nov 19 2007, 12:08AM
Location:
Posts: 139

You sure can build a tesla coil from this kind of power supply! A buddy of mine has built a higher voltage version of a DRSSTC... using some big IGBTs. I have yet to see it... but he claims it works quite well. I'm not sure if anyone else has tried this before or not. I have read somewhere that you can get IGBTs that will withstand voltages of 4 kV - pulse currents of 3000 Amps. I bet you'd be paying a couple grand for something like this!

Dragon64

Wed May 21 2008, 04:39AM

Registered Member #1438 Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218

A quick question OT, do you know what type of MO model that these inverters came in?

quicksilver

Wed May 21 2008, 02:30PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

The inverters in question are in the "lighter weight" models of MO. If you find a newer one and simply compare it to an older one (by picking it up & feeling the weight) you'll notice that the older one uses the typical wound transformer-type, while the new ones use the inverter. This design is to save money in copper and overall production cost. You will feel weight on one side (the old style transformer).

I believe that the Rules do specify the not requesting specific posts of schematics. But there are some out there if you hunt. (Note that in this case most inverters will differ in specific layout BUT the over-all design can be a wealth of learning. There is a member who did his dissertation I think, on inverter design) However; if you take out the inverter, you can get a wealth of information by studying the traces on the board. I did a search of the past posts and there are a lot of things that have been done (hint: "inverter, MOT", -projects).

Remember however that the HV output is a plug with twp males close together; that will need to be dealt with as arc over will not be fun. Additionally there is a warning about the heat-sink being charged, so safety demands that the whole unit be treated like a cap. The inverter a really nice find if you can get one.

Kristian

Wed May 21 2008, 11:22PM

Registered Member #611 Joined: Wed Mar 28 2007, 11:40PM
Location: Hudsonville, Michigan
Posts: 79

teslacoolguy wrote ...

I know i am not a moderator but remember the rule about asking for schematics...

Oops. My bad. I knew that, too. I just wasn't thinking when I posted. My apologies to the group.

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob