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Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
You don't need a car battery, even small AGM batteries can supply a lot of current. A used 8Ah one runs about $10. Look on ebay for a Lead Acid AGM battery.
The inductor core can be found in an ATX PSU. They cost all of a few dollars for a used one. 18AWG magnet wire works just fine for everything.
He means the gate resistors, or in your case the 1Kohm@5W ones.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
You will not cheaply find a suitable toroidal inductor for a high-power low-voltage zvs due to conflicting requirements; - many turns to produce the required inductance (Al x N^2) - few turns to avoid saturation due to Amp.Turns (N.Idc) - few turns of thick wire for low dc volt-drop (Idc x Rdc) - many turns to reduce core loss at primary resonant frequency ....... Specifically, 88 turns on a T400-26 toroid ($11 from Amidon) = 1mH suitable for 5Adc to 10 Adc (depends upon frequency) (This is my 'test' inductor, It's definately NOT a 'standard' as the inductance varies with temperature, current and frequency) I would suggest a ferrite core with an airgap is the best choice. If you're going up to 500 kHz and above a toroidal T400-2 would be good.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
If you can find any B&W CCTV monitors often there are some chokes with Lutz wire that occasionally look pretty beefy. Unfortunately they are not toroidal. Plus I do not know if or how they "code" those things to determine their value aside from using test equipment.
Those Caps (the Vishays) are great quality but that's pretty expensive. That's why it's great to cannibalize old equipment for components.
Registered Member #3340
Joined: Wed Oct 20 2010, 07:28PM
Location:
Posts: 69
Sulaiman wrote ...
You will not cheaply find a suitable toroidal inductor for a high-power low-voltage zvs due to conflicting requirements
What if i want the zvs to be high-voltage low-amperage?
Grenadier wrote ...
You don't need a car battery, even small AGM batteries can supply a lot of current. A used 8Ah one runs about $10. Look on ebay for a Lead Acid AGM battery.
The inductor core can be found in an ATX PSU. They cost all of a few dollars for a used one. 18AWG magnet wire works just fine for everything.
He means the gate resistors, or in your case the 1Kohm@5W ones.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
quicksilver wrote ...
I have tried all sorts of chokes working my way through various levels; however I always used a toroidal (and rather a heavy shape design). I agree that those simply aren't appropriate for the current. The ZVS design is made for high current. In fact if you aren't using about 5A or better; your results will be the same as many simplistic designs. What has been helpful is knowing that the 470ohm resistors need to be at minimum 3watts (the 10k can be little 1/2W),connections short as possible. Efficient, well designed heat sinks & insulation for the MOSFETS, and the "output" capacitor as high quality, non-electrolytic are a fairly mandatory assembly issue(s).
I rarely use a toroidal: extra winding effort . If you use a L7812 to feed the gates, you won't need 3W resistors, 1/4W are fine :)
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Michalis.Biochem wrote ...
Sulaiman wrote ...
You will not cheaply find a suitable toroidal inductor for a high-power low-voltage zvs due to conflicting requirements
What if i want the zvs to be high-voltage low-amperage?
Then you should look at some other driver than a Mazilli ZVS, from my experience it will typically put out 20kV when running stable.
You can use PVC wire for the primary, its just harder to fit larger wire dimensions due to the insulation. But the increased spacing and insulation between primary and secondary is not a bad thing, I have often seen corona from the flyback body to my primary windings when pushing it hard :)
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Lo voltage high cuent zvs's ae possible, all you need to do make you on tansfome. It's eally simple, all you do ind you on coils on a flyback coe. Put both the pimay and seconday on one side o leakage inductance ill limit the cuent. I made 120V befoe ith a hommade tansfome, but since I put the pimay opposite fom the seconday cuent as limited.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
Grenadier, You really need a new keyboard.
The approach you're describing is interesting , actually I also did that using IRF540 mosfets, I put some pictures in some other thread: It has many uses like powering induction coils using a ZVS driver with an intermediate flyback, and so on.
I'm surprised to see not many people are using that.
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ZVS
