New Type of ZVS (andrineri FT Driver) on Mains / General Science and Electronics / Forums

Forums

4hv.org :: Forums :: General Science and Electronics

« Previous topic | Next topic »

New Type of ZVS (andrineri FT Driver) on Mains

1 2 next

Move Thread

LAN_403

Reaching

Tue Dec 05 2006, 09:08PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

within the last 2 Days i made a few Spice simulations based on the Andrineri Flyback driver. i want to use it on a sstc or a induction heater, so i tried some things out and came up with a really nice circuit running on mains. the simulations are done and tommorow iÂ´ll start to build the circuit. its mainly the basic ZVS circuit everybody here knows but with a few changes. and the best thing, you dont need expensive high voltage mosfets, the drain voltage is in the range of 100 to 200 volts with a input voltage of 300v dc . the circuit starts to oscillate without any problems and all measured currents and voltages are within the range. the frequency is adjustable via the parallel capacitor in a range from 30 to 300khz without any complications so its usable for a UBER simple high power sstc with something around 600watts which is in a doable range of the circuit. this circuit doesnt need a extra voltage source for the mosfet gates. who cares about 10watts of power waste in the only 2 high power resistors on the board.wait until tommorow, then i can post my test results and hopefully a working version of the simulated circuit

uzzors2k

Wed Dec 06 2006, 03:03PM

Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308

I can't wait!

vasil

Wed Dec 06 2006, 04:17PM

Registered Member #229 Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506

Youppiii! You did it. The italian team (Vladi and all) is still searching the idea to adapt it for mains. I want to see it too.

Dr. Dark Current

Wed Dec 06 2006, 04:19PM

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

This sounds very interesting! Exactly the type of circuit I am looking for. Can't wait for the schematic

Reaching

Wed Dec 06 2006, 10:43PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

okay, first test tonight was successful but not what i expected. i need more time for more simulations and tests. but so far it starts oscillating and nothing exploded

Marko

Mon Dec 11 2006, 09:27AM

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

OK, any more info on this except 'first light was sucessful and nothing blew up?'

Using 100 volt devices with 320V supply... wtf?

Guessing it's a halfbridge or etc. switches are still going to see at least supply voltage.
Any switching system must be as such, unless it's a lightbulb in series, reactively limited current?

Reaching

Mon Dec 11 2006, 11:31AM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

no, the mosfets are sharing the voltage via a capacitive /inductive divider. but its hopeless, it does not work like it should. the simulations showed that it should work but in practice its totally different,. dont know.

i made a few other simulations with a inductive ballast like in the original zvs circuit, but the voltage on the mosfet drain goes up to 800volts, so its hopeless.

the only way to go is to capacitive divide the supply voltage but then the maximum output power is less than 100watts.

Marko

Mon Dec 11 2006, 12:18PM

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

Schematics, pics for me? If you are keeping it secret nobody will know how to help you out

Steve Conner

Mon Dec 11 2006, 01:41PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

I think you should post the circuit too. It'll be a very good challenge for the board members to try and figure out why the simulated circuit works but the real one doesn't.

BTW, did you know about the BUP314, a 1200V TO-247 IGBT from Siemens? You can make a ZVS running off 230V with them, and last I looked they were fairly cheap and available in Europe. I think Vasil once got hold of some in Romania and made DRSSTCs with them.

In fact, the original project that made the ZVS popular was an air-cored SSTC running off 220V mains using these devices in the ZVS circuit, built by the Italian coiler Vladimiro Mazzilli, which is why we called it the Mazzilli driver for a while.

The BUP314D with built-in diode may be more convenient.

Marko

Mon Dec 11 2006, 02:06PM

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

Sure, 1200V IGBT's are pretty and solve the problem directly, but unpractical for small things like small flyback drivers or SMPS's as they are hard to acquire (at least here, as I only have a very limited supply from bosnian RS.)

1 2 next

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