High Voltage Flyback Driver with PWM
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- Опубліковано 27 жов 2022
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PWM Module video: • Ajustable PWM Generato... - Наука та технологія
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.
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.
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.
What about using a pull down resistor on the mosfet gate to help turn it off more quickly (due to gate capacitance)?
That's good advice!
What do you mean and what resistance value do I need?
@@dpyp mosfets are voltage controlled devices operate using capacitance. Without a gate pull down resistor, the mosfet "wants to" remain on.
@@nix324 Resistors not needed if in a push-pull configuration but he is using a single mosfet.
Can you find the resonance frequency then use the frequency generator and put it on the resonance frequency
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?
a new idea in flyback drivers, thats great...
Flyback transformers or horizontal output transformers were designed to run at 15750hz which was the horizontal frequency.
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 ?
@@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 .
…but in the experiment the arc seems to be greater at frequency below the 15 khz range ?
@@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.
I drive mine at 115khz and it rocks
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
Thanks!
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.
Output is pulsed dc
@@ludicscience Thank you.
Is it possible to reduce its noise, by instead of feeding it with a single frequency, feeding it with white noise?
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.
I got a bunch of flybacks from ebay several years ago. They are hard to find nowadays
Good excellent circuit
Is it okay to use 20volt as input?
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?
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.
my mosfet keep dying so fast.=(
what's wrong might be?(
is it possible to produce music from arc
Yes it is
How is there a video like this on your channel?
Can you give me link?
Does the output voltage go down if you went even lower in frequency?
Yes
good evening the mosfet with circuit diagram no protection what do this problem
irfz44 has flyback diode
Pls try ZVS driver.
So what happens if you change the duty cycle?
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
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
Can the PWM generator be directly connect with a car battery?
Use PWM to drive a mosfet or IGBT connected to the car battery like he did.
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