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Registered Member #3918
Joined: Sun May 29 2011, 08:42PM
Location:
Posts: 34
Hi all, my first post here :D
I did a few quick searches of this forum and it came up with nothing, google didn't help at all either so i thought i'd come and ask: I have a half-wave internally rectified flyback transformer driven by the popular Mazzilli ZVS circuit, i am using it to power a DC excited CO2 laser (needs 15kv @ 18ma or so). There is a problem (i can go into more detail if need be) with the laser when running at higher powers that many people have told me is caused by running the laser from AC, i was just wondering if there is a quick way i can check if my flyback is putting out AC for whatever reason? I suspect the diode has blown, i doubt its meant to pass 18ma for any extended period of time...
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
you could series a bunch of diodes together so that the dc blocking voltage is greater than your voltage. hook the cathode up to your output and see if any sparks make it from the anode to ground. or you could make a voltage divider and measure the voltage with a multimeter and see if it's ac or dc. or if a coil of wire wrapped around the output while it's running has an ac voltage induced in it. I also remember seeing a homemade hv probe on here that had a series of high value resistors and a small neon bulb, and if both sides of the bulb glowed, it was ac, and if only one glowed it was dc.
edit: nvm, the coil of wire around the output won't work since the current is so low.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Maybe others can comment here, but you may not be getting 18mA from the flyback. I'm not that familiar with the Mazilli circuit, but maybe running two in parallel will give more mA.
Don't just take my word for it, though. Wait for others to comment.
Registered Member #3918
Joined: Sun May 29 2011, 08:42PM
Location:
Posts: 34
Neon bulbs! Why didn't i think of that! I've used them many times to check for DC, just not for leaking AC. I'm off to test it now... Thanks for all the suggestions guys :D
Edit: Sorry ash, didnt see your post there. I have a multimeter set to the milliamp range in series with the HV ground lead, it shows about 10 to 20ma depending on laser temperature and the laser output seems to reflect this. But then again, you do have a fair point, flybacks really arnt meant for that kind of current. Its probably the HV screwing with my meter...
Edit: Ok back from testing. As far as i can tell the output of the transformer is AC. Well, off to go find HV diodes i go...
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Testing flyback for AC output
