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Is this driver efficient or not?

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LAN_403

quicksilver

Fri Jul 25 2008, 08:54PM

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

IF you have available an old IDE drive and have a Torx screwdriver to take it apart, it contains some of the strongest permanent magnets on earth. {GREAT source for magnets as there are so MANY ide's that are now junk.}

I really wish I had my son's phone to post a picture of this....but if you draw an arc through a powerful magnetic field you can get some amazing effects.. however if you use the magnets as pole pieces the field effect spray is unbelievable!

Regarding the above schematic: if the 555 is handling 5 amps something must be going well. The ZVS driver I'm using however doesn't warm up till 8 unless the arc is in place longer than 60 seconds & I'm also using IRFP250's

But there we also have the issue of a center tapped primary. Could it be that the primary coil configuration also plays a part in the efficiency of any design?.

Ken M.

Fri Jul 25 2008, 10:13PM

Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628

Yea a few people have made posts about HV in a magnetic feild, do a search on the site, and you should find something.

Plasmaarc452

Fri Jul 25 2008, 10:53PM

Registered Member #1394 Joined: Sun Mar 16 2008, 06:18PM
Location:
Posts: 111

I just fried the mosfet when I hooked it up to a pc power supply at 12v, before I had been running it off 8 AA batterys is series. The mosfet got fairly hot but while I was adjusting the frequency of the 555 it just stopped stopped but the mosfet continued to get hot. So I fried the mosfet but the whole 555 timer system works great so all i need now is some beefy mosfets.

Marko

Fri Jul 25 2008, 11:21PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Plasmaarc452 wrote ...

I just fried the mosfet when I hooked it up to a pc power supply at 12v, before I had been running it off 8 AA batterys is series. The mosfet got fairly hot but while I was adjusting the frequency of the 555 it just stopped stopped but the mosfet continued to get hot. So I fried the mosfet but the whole 555 timer system works great so all i need now is some beefy mosfets.

Plasmaarc, don't bother with this circuit, it doesn't work, and that's really not your fault. Just build the mazilli flyback driver when you get some larger mosfets, I'm sure it will make you happy.

GeordieBoy

Sat Jul 26 2008, 12:46AM

Registered Member #1232 Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881

Jan, in that schematic for a quasi-resonant flyback converter it might be helpful to use the dot-convention to show the correct connections to the flyback transformer windings...

As it is drawn it implies that the primary and secondary are in-phase, in which case the output diode would be connected the wrong way around. It would conduct during the on-time of the switch, rather than conducting the high-voltage flyback pulse created when the primary-side switch opens. (The distinction being made is between a quasi-resonant forward converter, and quasi-resonant flyback converter.)

The simplest way to correct this would be to put a dot at the bottom of the primary winding, and a similar dot at the top of the secondary winding.

Maybe it is being a little pedantic, but if someone was to follow these instructions and wind their own transformer, this is one of the few instances where the winding polarities do matter. This is the diagram I posted on my site:

-Richie,

Dr. SSTC

Sat Jul 26 2008, 01:26AM

Registered Member #1407 Joined: Fri Mar 21 2008, 07:09AM
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Posts: 222

Marko wrote ...

Plasmaarc, don't bother with this circuit, it doesn't work, and that's really not your fault. Just build the mazilli flyback driver when you get some larger mosfets, I'm sure it will make you happy.

Marko this circuit works very well with the quasi-resonant mod, the mosfet doesnt even heat maybe you should have a go at it

this circuit is useful because you have lots of control with the out put voltage and frequency and the mazzilli cant do this

Plasmaarc452

Sat Jul 26 2008, 03:22AM

Registered Member #1394 Joined: Sun Mar 16 2008, 06:18PM
Location:
Posts: 111

The reason I like this driver is because I have ultimate control over the output voltage, frequency, duty cycle ect... The mazzilli is just really powerful but you don't get as much control over certain variables. I am going to build this driver better and the mazzilli driver so I can have 2 drivers for different applications.

Dr. SSTC

Sat Jul 26 2008, 08:47AM

Registered Member #1407 Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222

Plasmaarc452 wrote ...

The reason I like this driver is because I have ultimate control over the output voltage, frequency, duty cycle ect... The mazzilli is just really powerful but you don't get as much control over certain variables. I am going to build this driver better and the mazzilli driver so I can have 2 drivers for different applications.

ye thats why i built both

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