# Questions tagged [zvs]

Zero-Voltage Switch driver, a.k.a. Mazzilli oscillator, a Royer-type resonant push-pull oscillator.

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### Understanding the discrepancy between Input and Output power in ZVS Induction heater

I am using a ZVS induction heater like this: Image Source The schematic looks akin to this (schematic has not been tested) Schematic Source I modified it with IRF3205 N-Channel MOSFETs for better ...
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### Zero Voltage Switching (ZVS) in Conventional Full-Bridge DC/DC Boost Converter

I am trying to design a Conventional Full-Bridge DC/DC Boost Converter with the following parameters (I am not sure if you need them); Input voltage: 24 V (DC) Output voltage: 400 V (DC) Output ...
59 views

### How to choose Duty Cycle value for a Full-Bridge DC/DC Converter

I've noticed that while designing DC/DC converters, some sources (at the bottom of the website, comment of Benjamin Lough) suggest a "rule of thumb" duty cycle of 70%, while others (This is ...
67 views

### Building a half-bridge zero-voltage switching inverter for induction heating

I am not an electrical professional so please me patient with me. I'm trying to build a half-bridge ZVS inverter for a small induction heater (I want to try to do some small scale welding). I tried my ...
25 views

### Regarding the equation derivations of the resonant state of an asynchronous buck converter observing zero voltage switching

I'm currently reading this article of Bill Andreycak to understand the mathematics behind zero voltage switching: https://www.ti.com/lit/an/slua159/slua159.pdf?ts=1710666811170&ref_url=https%253A%...
1 vote
109 views

### ZVS Circuit as LC Oscillator

I was wondering if a ZVS circuit would be suitable as an LC oscillator. I have used a ZVS circuit before for induction heating, and observed that the idle power draw was relatively high. I used a ...
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### Need regulated 15 kV output

I was just playing around with this ZVS circuit I made in LTspice. It was made to output 15 kV, but when I saw its actual output it had spikes of 25 kV, then it stabilized after a while. How to ...
1 vote
116 views

### ZVS low noise power supply?

I'm currently looking for low noise isolated DC-DC power supply for analog components. There are different variants available, like SN6501 IC or integrated DC-DC convertors. But I wonder, what if I ...
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1 vote
115 views

### How is soft switching in a PMSM inverter achieved?

Recently I found some papers about PMSM drives that use the regular circuit of 6 e.g. IGBTs to drive a permanent magnet synchronous motor but with a resonant circuit in front of it to achieve zero ...
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### ZVS not working and doing weird things?

I recently made a simple ZVS circuit using 1w 15V zeners (BZX85B15-TR) , UF4007 ultrafast diodes, IXFH36N60X3 Mosfets, the capacitor consisted of a 3S3P setup with each cap being 680nf 250v film caps, ...
1 vote
231 views

### LTspice transformer not working as expected

I made this ZVS circuit on LTspice and want to make high voltages with it. The ZVS circuit does work fine and output high power but the transformer I made doesn't work fine. I want x400 step up which ...
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### Voltage drop across LC tank

I've been playing around with a ZVS circuit on Falstad, and it seems that the voltage drop across the LC circuit is based almost entirely on the size of the 2 inductors outside of the tank (the ...
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1 vote
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### ZVS driver not oscillating - powersupply

I'm using a ZVS driver to create a spark for a plasma speaker. The circuit above is the one I'm using for my project however I have run into some issues whihc I do not understand. First of all the ...
265 views

### ZVS circuit to generate high DC voltage

I'm trying to design a high DC voltage generator to create a voltage differential between the upper and the lower part of a cloud chamber I'm building. I'm trying to use a ZVS circuit to amplify an ...
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According to the TI LLC document, I can use eq 32 to calculate the dead time to achieve the ZVS in the half-bridge LLC Converter. below is my spec of half bridge of LLC converter. the deadtime I ...
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1 vote
170 views

### In a ZVS circuit, why does frequency increase when an arc forms?

In a GreatScott video, when he made an arc using a ZVS circuit, the frequency jumped from 40 kHz to around 80 kHz when the arc formed. I read that this is because the inductance is reduced because of ...
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1 vote
170 views

### ZVS Oscillator for Wireless Power Transfer

I am designing a wireless power transfer system based on the Royer oscillator ZVS principle. I based my circuit on the following image, this can be found in the application note [ANP032] page 21. The ...
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1 vote
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### Transformer output does not agree with formulas

I built my own step-up transformer to be driven using a ZVS using a core from a flyback transformer in order to charge some 450 V capacitors. I wanted to see how well my transformer operated with a ...
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### ZVS induction heater gets really hot diodes

I'm an embedded software developer and am trying to up my electronics and board design knowledge. As a good first exercise I made a ZVS induction heater. project link Once assembled I was happy to see ...
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### Unexpected current of ZVS circuit and transformer

I recently built a ZVS circuit to drive a step up transformer to charge some 1000uF 450V capacitors. The ZVS works fine and the capacitors charge to around 390V pretty quick. So I wanted to check the ...
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### In PS ZVS FB Converter, when the primary current flows through the diode D3, why does diode D5 on the secondary side conduct?

I'm learning a PS ZVS FB Converter, the circuit is as fellow: The waveform is as fellow. ip is the primary current of transformer. During the time [t2,t3], the circuit works as fellow: The thick ...
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### Concerns with operation of ZVS circuit

I'm looking to build my first ZVS circuit to use for future projects. But before doing so I want to fully understand how and why the circuit works the way it does. So I built a model in LT SPICE which ...
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### Can this ZVS driver power a Cockcroft Walton Multiplier?

I'm having trouble figuring out how to connect my ZVS driver (30-50khz) to this Cockcroft Walton multiplier (CWM.) I'm starting to wonder if it can even work with this circuit. Its maximum arc gap is ...
1 vote
207 views

### Why does this ZVS Driver circuit use a DC current source to measure the output?

I purchased a simple ZVS driver off Amazon to use with a Cockcroft-Walton multiplier I plan on building, but wanted to test the circuit in Multisim first before adding it. The ZVS Driver works well so ...
897 views

### Why ZVS driver (mazzilli) is necessary/preferred?

I need to make a continuous high voltage arc for some project (Birkeland Eyde process). Most generators use ZVS with mazzilli driver, some use voltage multiplier stages and transformers etc. Since I ...
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### ZVS Flyback - GaN / Si

I am reading a datasheet of a ZVS flyback controller. In it are written the following lines: These lines explain that the controller is looking at the switching node of the primary MOSFET (drain) and ...
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### Two FETs driving a transformer without a center tap

The project require a compact plasma arc generator, which needs a lot of current so I chose two FETs driving a transformer. The problem is I cannot find commercially available high-voltage transformer ...
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### Why does my resonant converter add more losses?

I am currently designing a DC/DC converter transmitting energy from a solar panel to a load, using a transformer. The model of my circuit can be found on this figure: To migitate the losses, I have ...
1 vote
702 views

### Why do the MOSFETs burn in my ZVS circuit?

I have made a zero voltage switching heater to melt metal components. Here is the schematic (I found the schematic in this video): simulate this circuit – Schematic created using CircuitLab ...
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### ZVS driver drawing too much current

Lately, I've been trying to build a ZVS circuit that follows the schematic shown below However, when I actually attach a DC power supply (eTM-305A) that can supply up to 5A @ 30VDC, and crank is past ...
286 views

### Can I put high voltage thyristors in series & ZVS to handle MHz frequency resonance?

I'm trying to scale up a circuit that calls for a MOSFET and a ZVS to be capable of dealing with high frequencies (1-20 MHz.) I'm aiming to crank it up to 10 kV and would prefer the systems in series ...
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### Tesla coil with flyback transformer and ZVS circuit

I am new to the field of electronics and I might have some wrong concepts. I was thinking of designing an old fashioned 'spark gap' Tesla coil. Materials I have: a flyback transformer a cheap ZVS ...
1 vote
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### I wanted to make plasma pen. So I made mini ZVS circuit which worked but when I connected it to inductor and transformer it stopped working

I had used these components 333 ohm resistors, an led as indicator, 1uF capacitor (50V), NIKOS P75N02LDG MOSFETs,4R7 inductor, PH 4148 diodes, ccfl transformer from laptop backlight inverter board ( ...
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### How does zero voltage switching work if VDS = 0?

One of the fundamental criteria to put a MOSFET in to saturation is for its VDS > VGS-VT. It's also my understanding that zero voltage switching works by first decreasing VDS (ideally to 0) before ...
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### MOSFET for switching 1000 W ZVS induction heater?

I have a 48V power supply powering a 1000 W ZVS induction heater. I would like to switch the heater on and off with an Arduino. Is using a logic level MOSFET appropriate for this?
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277 views

### ZVS driver not oscillating

As far as i can tell i am following this circuit, although different components. However, when connected to a DC supply, both LEDs light up dimly and there is no oscillation. It appears that the ...
1 vote
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### ZVS buck converter

How do I implement the zero current detectors (ZCD) in the buck converter? I want to use it to implement the ZVS buck converter, and I need to detect the zero current, but I have no idea about ZCD. ...
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### buck converter in CRM

I would like to simulate the ZVS Synchronous rectification buck converter, I know if I operate in ZVS I need to change the switching frequency of the buck converter. Here are my questions: How to ...
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### Using Circuit of Plasma Globe to Power a Tesla Coil

I had this old plasma globe laying around so I opened it up and found what I think is a ZVS circuit(I have ZERO knowledge of high voltage electronics and I may be wrong). I also have a wound tesla ...
1 vote
394 views

### What determines the frequency of a ZVS driver

Schematic of ZVS driver Output waveform of transformer Determining frequency from time difference between peaks of output waveform at secondary coil of transformer I was simulating a ZVS driver in ...
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### SMPS Simulation Help

Finally bit the bullet and considered getting help with a simulation I'm looking to get right. Just a heads up, I have limited experience with SMPS simulation in both LTSpice and Multisim. The circuit ...
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### PSPICE ERROR(ORPSIM-15143): Voltage source and/or inductor loop involving

I'm facing a problem with an error message in Pspice. How do I address it? ...
1 vote
366 views

### Input and output power of ZVS not understood

I am trying to learn electronics and came across these ZVS drivers, which seem quite elementary. I understand what an inductor and a capacitor is (although obviously I don't know all the concepts). My ...
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### Induction Oven mosfets overheating

I made this circuit inspired by this website: http://www.electroboom.com/ It seemed to work for a few seconds but the mosfets got really hot, they started to smoke and eventually one of them died. I ...
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823 views

### Royer oscillator - frequency shifting in WPT

I am having a problem with my WPT resonant application. In my circuit modified Royer oscillator feeds LC tank. Receiver coil nearby is connected to rectifier and variable resistor. I know about ...
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### Low or high side switching for ZVS Mazzilli induction circuit?

I'm trying to teach myself electrical engineering as a hobby and have been studying zero voltage switching induction heating circuits. I'm learning about electronics and designing a circuit as I go ...
2k views

### Trouble shooting ZVS driver

I've posted a few question on this forum about ZVF drivers and you all have been a big help and I'm hoping you can help me again. Forgive me if this is a bit long, I just want to be through.   Above ...
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### How do I size a zener diode for use as a freewheel diode for a ZVS induction heater?

My electronics experience is "hobbyist" and I'm in some new territory with this question, so forgive me if this question turns out to have an easy answer or prove to be dumb. I have a basic ZVS ...
1 vote