Did this same thing about a year or so back but used a mosfet modual as well with the same square wave gen. really good for working out the best frequecy for each fly back and pushing it to the best output. and i can drive it with 24v.

Thanks, very interesting ! I used an audio spectrum analyzer to check the frequencies. It's funny because I could see all the harmonics, like for the 5 kHz, I saw 10 and 15 kHz peaks.

Can you find the resonance frequency then use the frequency generator and put it on the resonance frequency

Add a feedback winding and a capacitor across the primary winding. The circuit self oscillates at the resonant frequency and the capacitor stops the mosfet from blowing up if the seckndary is open circuit.

Can you make a video with the frequency generator to a zvs? I am looking to get the frequency (sound) with a higher output voltage. Or would the frequency still be there if I added a voltage multiplier to the output of the fly back?

That pwm looks super handy. I wonder where to get one... i will not b lazy and go check provided vid link. Thankyou for sharing ludic i really love yr content

@ludicscience

Жыл бұрын

Thanks!

a new idea in flyback drivers, thats great...

What about using a pull down resistor on the mosfet gate to help turn it off more quickly (due to gate capacitance)?

@ludicscience

Жыл бұрын

That's good advice!

@dpyp

Жыл бұрын

What do you mean and what resistance value do I need?

@Enigma758

Жыл бұрын

@@dpyp mosfets are voltage controlled devices operate using capacitance. Without a gate pull down resistor, the mosfet "wants to" remain on.

@Enigma758

Жыл бұрын

@@nix324 Resistors not needed if in a push-pull configuration but he is using a single mosfet.

@MaDnBaD

7 сағат бұрын

@@Enigma758 no way! that's might be the reason why almost every mosfet ( even more durable and powerful) keeps dying in my case. I'm using the same circuit as in the video, with some modifications : thicker primary 6mm monolith to escape heating, 50kHz 0,33 nf capacitors on primary and stabilising capacitor on the input and 120 om resistor on PWM output. The peak I reached was around 190 watts with irf3205 with 10v D-to-S and 18 amps at 25 kHz. With active double fans capable of working around 10 mins nonstop. IRFZ44, irf1405, IRFP260m and many others die so fast not even getting closer. Actually one did, yet on low frequency around 7 kHz, but buzzing noise is unacceptable. Many other mosfets die on powering on in this circuit. If I got your idea right, there is a kind of capacitor in between gate and source of mosfet, so using it on a super high frequency with many amps delivery need an additional resistor to help it getting discharged faster? Zener diode can work as well?

Flyback transformers or horizontal output transformers were designed to run at 15750hz which was the horizontal frequency.

@coucouj2781

Жыл бұрын

So does that mean at 1.57 khz, resonance is acheived and that the arc is at its greatest for that given voltage at the primary ?

@aboveaveragejoe6291

Жыл бұрын

@@coucouj2781 it's 15.75khz and yes if the actual primary winding was being used. A transformer about that size would put out almost 30kv because their is also a built-in tripler .

@coucouj2781

Жыл бұрын

…but in the experiment the arc seems to be greater at frequency below the 15 khz range ?

@UserName-cb6jz

Жыл бұрын

​@@coucouj2781 What is important is the length of each pulse, not frequency. You could have one pulse each second, but its length would have to be no more than about few microseconds. A pulse charges the magnetic field, and when the pulse is off the magnetic field collapses very quickly producing high voltage. The energy contained in the primary pulse (current × voltage × time) determines the energy on the secondary.

@nathanieljames7462

8 ай бұрын

I drive mine at 115khz and it rocks

Good excellent circuit

Is it possible to reduce its noise, by instead of feeding it with a single frequency, feeding it with white noise?

Pls try ZVS driver.

Doesn't this kill the MOSFET quite quickly? If there is no way for a current to flow on the secondary side (e. g. no arc), where does the energy stored in the transformer go? Won't that create a huge voltage spike on the primary side?

@ianhosier4042

Ай бұрын

Put a capacitor across the primary winding if you don't want your MOSFET blowing up when the secondary is open circuit. Some put it across the mosfet but then you end up blowing the input capacitor and possibly your power supply.

where do you buy flyback transformers? i have one small one i got in a kit on ebay but i cant find any large ones.

@ludicscience

Жыл бұрын

I got a bunch of flybacks from ebay several years ago. They are hard to find nowadays

Dear can you please confirm whether the output of your flyback transformer is a sine wave or rectified DC pulse when applying pwm stream using MOSFET. Some flyback transformers come with a High voltage diode hidden inside the anode connection.

@ludicscience

Ай бұрын

Output is pulsed dc

@qinaan

Ай бұрын

@@ludicscience Thank you.

sir, the output of this high voltage flyback is AC or DC voltage output?

So what happens if you change the duty cycle?

@igrewold

Жыл бұрын

I think the duty cycle acts as amperage=current there so + duty cycle % = + current & - duty cycle % = - current This based on my conclusion of running a led with pwm with arduino, maybe it is not right

@nathanieljames7462

8 ай бұрын

You are expanding and collapsing a magnetic field. I go 50/50 to give the transistor(s) the most time for their on delay, rise time, off delay and fall time. Of course most chips can switch from 100s of khz to several mhz without issues except for optocouplers.... I drive my flyback at 115khz through an IGBT switched by a mosfet so there's compounding delays to consider

my mosfet keep dying so fast.=( what's wrong might be?(

Does the output voltage go down if you went even lower in frequency?

@ludicscience

Жыл бұрын

Yes

@kuhalaabd8156

8 ай бұрын

good evening the mosfet with circuit diagram no protection what do this problem

@nathanieljames7462

8 ай бұрын

irfz44 has flyback diode

Can the PWM generator be directly connect with a car battery?

@nathanieljames7462

8 ай бұрын

Use PWM to drive a mosfet or IGBT connected to the car battery like he did.

is it possible to produce music from arc

@ludicscience

Жыл бұрын

Yes it is

@jatinkhajuria7151

Жыл бұрын

How is there a video like this on your channel? Can you give me link?

Is it okay to use 20volt as input?

@MaDnBaD

7 сағат бұрын

use as many as mosfet let's you

👍👍👍👍👍👍👍

A whole minute advertisement in a 7-minute video?