Right ZVS Materials? / High Voltage / Forums

Forums

4hv.org :: Forums :: High Voltage

« Previous topic | Next topic »

Right ZVS Materials?

previous 1 2 3 4 next

Move Thread

LAN_403

Dr. Dark Current

Sat Apr 08 2006, 05:36PM

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

Omicron wrote ...

How can I tell if they have a built in diode? I am buying them off the eletronics goldmine.

AFAIK, all fets have built-in diodes just from their structure...

...

Sat Apr 08 2006, 06:50PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

ya, but they are not that great of a diode. Some fets have an extra diode in the package for applications where you need a real diode across the fet.

As to finding the parts, that looks good. A few words of warning,
Those zeners are extreemly important. Even if you drive the gates of a seperate 12v supply you need them. Also, check the often. Just take a 12v supply with like 100 ohm resistor in series with it, and touch it to the gate with a voltmeter attached. If you do net get the zeners rated voltage replave it. If they fail you WILL kill fets (I killed like 10 460's before I realised wtf was going on).

The tank cap must be designed for high rf currents. Even those will heat up and die after a while if you are not carefull. Also, 33ufd is way too much, you want something in the 1-3 ufd range.

The wires connecting the tank cap to the flyback primary and the primary must be huge, like 10awg. It is hard to fit that size wire in the flyback you posted (I have a few of them), but use the biggest you can.

BTW, those flybacks you posted are great little guys, but they cannot handle high powers for very long. In my old sale/trade thread I have a little evaluation of them... (about 1/2 way down).

In my new for sale/trade thread I have all of the parts you need to build them... I also have tons (ok, like 30 lbs) of flybacks if you are interisted (some the same size as the cs ones, some larger--all similar prices).

Good luck and my tesla be with you

Omicron

Sun Apr 09 2006, 04:28PM

Registered Member #131 Joined: Fri Feb 10 2006, 09:25PM
Location:
Posts: 185

Ok almost done here the almost final listâ€¦

1. 24V CT (12-0-12)4A TRANSFORMER

2. 24V CT (12-0-12)10A TRANSFORMER

3. UF4007 Rectifier; 1.7V; 1A; 1000V; 700Voltage, RMS

4. OY471K Resistor, Ceramic, Axial, 2 Watt, 10%, 470

5 GBPC2502 200V 25Amp Bridge Rectifier

6. 1uF 600VDC Film Capacitor

7. IRFP350 400V 16Amp Mosfet

8. 12K 1/4 watt Resistor (Pkg of 100)

9. Flyback Transformer ETF-30L316AYT.

Theirs my list, but what about those 12v recifters in the original flyback driver, BTW thatâ€™s what I am building, the original driver.
Here will be 24 volts at 14 amps for power,

â€¦ PM me about those ZVS kits.

Dr. Dark Current

Mon Apr 10 2006, 05:07PM

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

Omicron wrote ...

Ok almost done here the almost final listâ€¦

1. 24V CT (12-0-12)4A TRANSFORMER

2. 24V CT (12-0-12)10A TRANSFORMER

Not too sure abut these two, the lower current xfmr will most likely output higher voltage (without load), so it will draw current even without load, but it should be fine. another thing is you must get right phasing of the secondaries so you dont smoke your transformers.

Edit- I was reffering to paralleling those transformers^^

Omicron

Tue Apr 11 2006, 10:50PM

Registered Member #131 Joined: Fri Feb 10 2006, 09:25PM
Location:
Posts: 185

Could I use Motorola 400V 16amp MTW 16N40E Mosfet in my ZVS, there cheaper.

...

Tue Apr 11 2006, 11:01PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

They might work, but the on-resistance is pretty high (240moh, instead of 73mohm), so it will run hotter. But I would say it should work...

Dr. Shark

Wed Apr 12 2006, 11:33AM

Registered Member #75 Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711

You should also get some stripe-board PCBs, and get plenty of spares of all the parts.

Omicron

Wed Apr 12 2006, 08:52PM

Registered Member #131 Joined: Fri Feb 10 2006, 09:25PM
Location:
Posts: 185

All right! I found a source of the old type of flybacks!
[link][http://www.surplusshed.com/pages/item/ r3046.html][/lin
Will these work better than [http://www.excesssolutions.com/cgi-bin/item/ES1269]

I costuted a crude ZVS last night,

havent tried it yet.

Self Defenestrate

Wed Apr 12 2006, 09:25PM

Registered Member #87 Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191

Both have their benifits, the first is ac, and the second is dc. I'd get one or two of each, as the wallet allows.

...

Wed Apr 12 2006, 10:10PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

are you sure the first ones are ac? The fact that they have the crt connector right on them seems to imply that they are DC (not needing the external rectifier)

previous 1 2 3 4 next

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