Introduction: The ZVS Driver

Picture of The ZVS Driver

Everybody who is interested in high voltage herd about  the zvs driver for the flyback transformer.
2x IRFP250 n-fet
2x 12v zenner diodes
2x 470ohm resistors
2x 10kohm resistors
2x 400v fast diodes
1x inductor 200uH
1x 250v capacitor 0.68uF or higher

Step 1: Assembly

Picture of Assembly

Mount mosfets on a large heatsink,
Solder everything togather

Step 2: Fineshed Assembly

Picture of Fineshed Assembly

Everything ready to be connected to power supply.

Step 3: Use for the Driver

Picture of Use for the Driver

It can be used as a power supply for the tesla coil or it can be used as an inductin heater ( for the induction heater try a 300v with 1uF or higher)


YunusK20 (author)2017-08-20

i want to build step down circuit.
input voltage, about 5-15 volt, 2 ampere or less.
output voltage, about 1-0,5 volt (or less), but producing 10-40 ampere.
i want to build a phyrography soldering iron by short circuiting the output.
i was made one using ohmic heating but not satisfied, the heat cannot be focused on tip.

can you guide me the modification of your circuit please?

can the flyback driver to be turn on/off rapidly?
I want to combine it with PWM driver so the power can be adjusted easily.

Wolf6774 (author)2016-05-20

I recently made a zvs driver, and I am using a 400w power supply, I hooked up the circuit to the 12v rail, and it doesn't produce any arcs, but one of the transistors heats up, could anyone possibly help? I've checked all of the connections, and an open to any advice given.

aclark17 (author)Wolf67742017-03-01

I've heard of this problem being related to not enough voltage to drive the MOSFETs, have you tried going over 12v?

GyurikaK (author)2016-04-05

Hello, my zvs works perfectly with 2 irfp260n's but they heat up pretty quickly, my question is could I put 2 more of them in parallel so the zvs could deal with more current and voltage or it will just blew up everything?

SallahS (author)GyurikaK2016-10-04

You can use up to 4 transistors in parallel (that is the maximum I tested, more is surely possible). Be sure to take a bunch out of the same batch. Add a 0.1Ohm resistor in series (at the source of the transistors). Reduce thermal resistance to lower the temperature of the transistors: Use heat conduction paste between the transistors and their cooling surfaces. Sooner or later (more sooner :) ) the coil will be the hottest part of the circuit. So, for higher powers I would recommend to go for a completely different design using a full bridge driver based on a IRS2543 or similar.

aclark17 (author)SallahS2016-12-12

I think its power supply related. I use IRFP250n MOSFETs and used the same schematic you did but I power it with a Variac running through a full bridge rectifier to get the DC power I need and I have zero issues with heat, the only problem I have is the flyback arcing to itself and the voltage getting so high it arcs through wire jackets lol

rah187 (author)2016-05-26

This circuit actually worked well for me the first time around when I placed the components on a breadboard, then it stopped working. I thought my connectins were sloppy so I etched a board and it still didn't work. It is quite possible I blew the MOSFETS. However, this circuit was great while it was working.

By the way: great 'Ible!

Alex1M6 (author)2011-08-23
Nice guide. Have you ever tried yours on 24v or higher? I find there is quite a difference between running a ZVS on 12 and on 24V.

theVader75 (author)Alex1M62011-08-24

no i didn't but now i want to build a supply for it

Alex1M6 (author)theVader752011-08-24

Lead acid battery's work well for this, that is what I used.

cccp3 (author)Alex1M62016-05-15

I put a 300A meter across a 7Ah 12v accu and read 300 for 5 seconds straight

FriXs (author)Alex1M62015-03-09

anyone tried rc accus yet with 60c/120c max? would they get destroyed?

theVader75 (author)Alex1M62011-08-25

yes they do but i dont have so much money to spend on a project

GioC1 (author)2015-06-01

i'm planing to use power supply from my old xbox(360) to power my ZVS, that i haven't finished yet, but

will this be the proper power supply for it or not?

GyurikaK (author)GioC12016-02-21

Yes it will be :) but... I think you might want to add another one in series to increase voltage to obtain longer arcs, since the xbox psu is just 12v...the amperage is ok :) I think it is 14,5A

gdawg98 (author)2016-01-23

could this support a 70V 200A DC power supply for a induction heater to make a induction furnace

RedstoneM (author)2015-11-22

Can I use a 1N4007 for that or do I need a UF4007?

RedstoneM (author)RedstoneM2015-11-26

BA159-E3/73 works as a fast diode, 500ns recovery time. Makes nice induction heater (needs some work for a smelter)

skozima (author)2014-03-14
このサイトの中の商品でIRFP250 N-FET の代用できるものを教えてください。

skozima (author)2014-03-14

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このサイトの中でIRFP250 N-FET の代用できるものはありますか?

leviterande (author)2013-08-30

Hi, I want to power a SGTC with this ZVS driver, my question: what about the dangers of burning the mosfets and flyback secondary from the SGTC kickbacks? or shouldnt I be worried?

Homepwner (author)2012-04-30

O.K. I built one of these on a plywood board and it worked beautifully at 24 volts from 2 car batteries. I hooked the secondary leads through A DVD disc and it exploded. I replaced every part of the first zvs driver and it didn't work, I built a 2nd, 3rd and fourth model, different methods, every time, and always new parts. Now all I get is an inductor that arcs and hisses or one of the Irfp250's heats up, ready to explode. I upgraded to 5W 470 ohm resistors,1-5 watt zener diodes, a .68uf non electrolytic capacitor rated @630 volts. I've wound 3 different inductors with different types of wire and different ferrite cores. I don't know what to do.....
anyone want to have a look at my latest proto board mounted unit?

Alex1M6 (author)Homepwner2013-07-03

Use a commercial inductor instead that you know it will not saturate, which sounds like what might have caused your circuit to latch up. It needs to be the powered iron type and have a saturation current rating of about 10 amps or more.

Homepwner (author)Alex1M62013-07-03
Hi, I did purchase a few new components last summer and found a combination that worked for me.
Less science based than trial and error :) I made a 4'tall jacobs ladder and although I wish I had made an instructable at the time....I at least made a long video on YouTube showing the layout... check it out if you want...and feel free to criticize. This setup oddly keeps cool except for the capacitors in the charge tank.
Thanks for the feedback!

Alex1M6 (author)Homepwner2013-07-03

That is really nice, I like how you have it all on a piece of wood and there is an switch mounted just in case ( :

What is the longest you have had it running for?

Homepwner (author)Alex1M62013-07-03

Thanks! I did use your instructables as partial inspiration for this build so I appreciate the compliment!
I have run it for 3-4 minutes. I really expected the Mosfets to get hot. They don't even warm up! The two capacitors connected to the primary windings do warm up fairly quickly.
The Zvs circuit shows only one cap....
I found that 2 caps heated up slower when connected in parallel..

Alex1M6 (author)Homepwner2013-07-04

The capacitors see very high peak currents which is why they along with the primary winding get quite warm (becuase of the resonant tank they form).

I have had MKP capacitors melt open before after long runs of my driver, lol.

These are the sort of capacitors they normally use in this type of application, and they normally have many in parallel. But if you want to see some real work capacitors then type in "induction heating capacitors" into google images. Huge things!

iTixle (author)Homepwner2012-07-28

I would try using a power supply with less current. Generally, car batteries have a good deal of current available and that can lead to things popping. The reason it's not working might be that your MOSFET's are instantly frying. I don't think IRFP250's are rated for that much current. If you must use car batteries as a power supply, get some more robust MOSFET's.

guruji1 (author)2012-02-01

How much voltage and freq it gives out?

dog digger (author)2011-09-11

The schematic (one) does not make sense. It's just a schematic for a tesla coil

dog digger (author)dog digger2011-09-11

oops, my bad

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