High Voltage Flyback Driver with PWM

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Жыл бұрын

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PWM Module video: • Ajustable PWM Generato...

Пікірлер: 52

@noelandrew3600 Жыл бұрын

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.

@emmanuelr6698 Жыл бұрын

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.

@mirzahosein2261 Жыл бұрын

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

@jonlitchfield8888 Жыл бұрын

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!

@Enigma758 Жыл бұрын

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 29 күн 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?

@Deutz-fahr-101 Жыл бұрын

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

@ianhosier4042 2 ай бұрын

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.

@tajamulhassan6664 Жыл бұрын

Good excellent circuit

@aboveaveragejoe6291 Жыл бұрын

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 9 ай бұрын

I drive mine at 115khz and it rocks

@nathanbunten4299 Жыл бұрын

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?

@jonaoconnor8065 17 күн бұрын

Its possible did you make it?

@jonaoconnor8065 17 күн бұрын

By interrupting the zvs output by a transistor driven by this pwm, is my plan, !!

@nathanbunten4299 17 күн бұрын

@@jonaoconnor8065 yes i did

@nathanbunten4299 17 күн бұрын

@@jonaoconnor8065 it is a little more than that. it overrides the frequency and sets a beat rate. I made a video with validation of what the circuit can do. kzfaq.info/get/bejne/ZrFhY6p-zcq0YJc.html

@neutronenstern. Жыл бұрын

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

@trigger.warning Жыл бұрын

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

@superdau Жыл бұрын

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 2 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.

@qinaan 2 ай бұрын

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 2 ай бұрын

Output is pulsed dc

@qinaan 2 ай бұрын

@@ludicscience Thank you.

@balbal1497 2 ай бұрын

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

@sidyajv Жыл бұрын

Pls try ZVS driver.

@MaDnBaD 6 ай бұрын

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

@_P0tat07_ Жыл бұрын

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 9 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