Questions tagged [resonant-converter]

Questions about resonant DC/DC converters as well as resonant DC/AC inverters used in power electronics.

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What is the origin of the names "forward" and "quasi-resonant" converters?

I'm curious about the names of some types of converters, such as forward and quasi-resonant converters. Why are they called forward and ...
internet's user avatar
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4 votes
4 answers
522 views

Why is an LLC converter's optimal Lm Lr ratio around 10?

I have seen this ratio of 9 to 11 being close to optimal for the Lm to Lr ratio in LLC resonant converters. Aall the sources mostly state it as a matter of fact instead of explaining why. What is the ...
Stonie's user avatar
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2 answers
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How does this part of push-pull converter work?

I took apart a power supply unit of some old kitchen lamp, and inside was this push-pull converter. It has an "optional" part, shown at the bottom of the schematic, which is not actually ...
Борат Сагдиев's user avatar
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86 views

Parallel vs series resonant converter

Why are series resonant converter such as the LLC more used than parallel resonant converters such as the LCC?
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Simulation Issues in Forward converter- Current Mode Design

I am trying to simulate the LT8310 part in LTspice. Based on my understanding, this part can operate in either the current mode or the duty mode. I am interested in the current mode design. The block ...
chami's user avatar
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3 votes
1 answer
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Some problems about the BJT in the resonant Royer (or Baxandall) circuit

This question is a continuation of my previous post about the resonant Royer (or Baxandall) circuit. I have built a prototype to verify the circuit. The parameters are as follows: The parameters of ...
T L's user avatar
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3 answers
421 views

Simulating resonant LLC converter issues

I'm trying to learn how this topology works to learn about high-power converter design. I have been following this application note from Infineon, and have been able to reproduce the numbers and ...
Godin's user avatar
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2 answers
402 views

Voltage/current rating for center-tapped rectifier vs. full-bridge rectifier

I am currently working on an LLC resonant converter. While reading an application note from ST microelectronics, I found something about using different rectifiers for different purposes. I ...
ishankhowal's user avatar
1 vote
1 answer
149 views

Current fed resonant Royer converter with switching regulator

In Linear Technology's Application Note 118 https://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf there is the following picture of a current fed resonant Royer ...
Hyp's user avatar
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How does this high voltage device work? [closed]

In Ali express, I found the following high voltage small generator for fun. One transistor, one single coil, 2 caps and 2 resistors (not sure if the leds are an essential part of the circuit). The ...
MikeTeX's user avatar
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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 ...
Sander's user avatar
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3 answers
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How to reduce NPN reverse base current on this interesting "Super Efficient Joule Thief"?

Note: The question part is the fixing of the negative current at the transistor base. It looks like there's a problem with negative current at the LED(s) -- this is not expected to be answered in this ...
MicroservicesOnDDD's user avatar
1 vote
1 answer
464 views

LLC resonant capacitor RMS voltage and output capacitor ESR calculation [closed]

I have a question about the TI LLC document. On page 25, Select the Resonant Capacitor, I don't understand why it can use this formula to calculate the RMS value. Could someone tell me how to get this ...
Jitter456's user avatar
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2 answers
1k views

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 ...
icantalktosneks's user avatar
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1 answer
418 views

Convert DC frequency (square wave) to AC

I have a DC frequency generated as a square wave from a 555 at 14 kHz (actually will be using a variety of frequencies but 14 kHz is one as example) with a voltage of 4.0 V. I want to convert this to ...
Shaun's user avatar
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Why does input DC supply gets short circuited when operational amplifier is connected at the output of LLC resonant converter?

Following is the block diagram of LLC resonant converter, more clear circuit can be found here. This is an LLC resonant converter which produces 250V across RL with 50V at input without any issue. ...
Sohail Ahmed's user avatar
4 votes
1 answer
366 views

Limit of resonant converters

I am currently trying to design a converter with GaN technology. The converter needs to regulate a wide range of current and consequently the power goes from ~1kW to ~10kW. I took a look on Texas ...
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Resonant converter - negative voltage on resonant capacitor

I built/designed a one switch resonant converter with a simple integrative feedback control only. I found they after some (increased) loading the resonant capacitor becomes charged to negative voltage ...
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synchronous rectifier controller having high voltage drain-source sense pin

I am looking for an IC that is suitable for synchronous rectifier operation and having high drain voltage sense pin. Most of the ICs (NCP4306, IR1168, UCC24612) are having drain sense pin up to 200-...
Deniz Güler's user avatar
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57 views

Trying to Dampen a Boosted LC Circuit

I am currently implementing the circuit shown below where the first stage is a boost converter and the second stage (output stage) is an LC circuit with a boost topology. The goal is to take a 24V DC ...
PrematureCorn's user avatar
1 vote
2 answers
153 views

Closed loop control buck converter

I have a buck converter of 400 V input, 200 V output, 300 kHz switching frequency, power output 100 W. I am trying to put it into closed loop voltage mode control. It is working DCM mode. Modelling ...
SM32's user avatar
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Pspice AC analysis

I want to get the open loop transfer function bode plot of the converter. Here is my circuit:- The pins of the CCM-DCM1 model are:- 1 - NMOS Drain 2 - NMOS Source 3 - Diode Cathode 4 - Diode Anode 5 -...
SM32's user avatar
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1 answer
269 views

Pspice giving wrong results

I have a ZCS buck circuit which I simulated on PSIM first, and wanted to simulate it in Pspice now with the real components. However, I am getting wrong results in Pspice, and I can't figure out why. ...
SM32's user avatar
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433 views

High frequency inverter using irf540n

I want to make a square wave inverter for DC resonant converter. I have constructed this full-wave bridge inverter which is to work at frequencies of 50kHz to 100Khz. The input is 37V DC. The gate ...
Usama Toor's user avatar
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1 answer
253 views

Calculating output voltage of a boost converter circuit

This a problem with a circuit of an up-converter, consisting of a constant voltage supply (E), a switch (SW), a diode (D), a coil (L), a capacitor (C), and terminals as shown in the figure. i(0) = 0 ...
A. Othmane's user avatar
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1 answer
375 views

Error in resonant converter simulation

I designed a closed loop resonant buck converter using voltage mode control and simulated on PSIM. Here is my circuit:- This gave correct results. Now I want to design an input filter so I simulated ...
SM32's user avatar
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2 answers
3k views

How to correctly use the formula for calculating the air-gap in a pulse transformer?

To achieve a certain value of the magnetizing inductance (Lm), we can adjust the transformer air gap. Air gap calculation formula: There is no particular information on this, but I assumed that: <...
Delta's user avatar
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170 views

How to correctly calculate Coss and Cstray capacitance in Full-Bridge LLC?

To select the correct value of the magnetizing inductance Lm, it is necessary to observe the equation: This allows the selected Lm to completely discharge Coss and other parasitic capacitances during ...
Delta's user avatar
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1 answer
338 views

What type of transformer is used in LLC converters? Is resonant or pulse the same thing?

Often in the description of LLC converters, I hear the mention of a resonant transformer. On Wiki, I found both resonant and pulse transformers. In the photos of the LLC converters - the transformer ...
Delta's user avatar
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398 views

Why does the LLC converter have an Lm inductor? How does it interact with the LC circuit?

Task: to understand why the LLC converter has Lm inductance and how it interacts with the LC circuit. What I learned: LLC converter circuit: The LLC converter is a DC to DC buck converter (...
Delta's user avatar
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4 votes
2 answers
239 views

Equation 20.16 Proof

In studying the Fundamentals of power electronics by Robert Erickson I do not understand how they arrived at the equations for current and voltage Link to Book, page 772 is where I am at https://...
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0 answers
272 views

Uneven current distribution in center-tap transformer secondary winding of LLC resonant converter at low load

I'm trying to design an 24V 50W LLC resonant converter with a resonance frequency of 250kHz. I've run into an issue with the center-tapped transformer that i can't quite find a reason for though. For ...
Hjortefar's user avatar
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0 answers
79 views

Resonannt frequency of resonant current converter DC/AC

I have to work with this topology of resonant current converter, and I want to clarify some points: T1 is a transformer that I should specify to designer LT is a tuning inductance T2 is a ...
hiak's user avatar
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0 answers
107 views

How to estimate NMOS Cds+Cdb capacitance from VDMOS Pspice/LTSpice model?

I'm designing a fly-back converter and in order to calculate the switching frequency I want to know a method or formula of how estimate the Cds+Cdb capacitance of NMOS switch using the Pspice ...
Jorge Johanny Sáenz Noval's user avatar
4 votes
1 answer
382 views

High Voltage Planar Transformers

I am designing a high voltage DC/DC converter that is for an aerospace application and therefore I am focusing on reducing the size and weight, so switching at a high frequency possibly integrating ...
jvnlendm's user avatar
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3 votes
1 answer
546 views

Difference series resonant and LLC DC/DC converter

What is the exact difference between a series LC resonant converter and an LLC converter. From a topological perspective, they seem to be exactly the same. I believe that for an LLC, also the ...
Simon R's user avatar
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-2 votes
1 answer
1k views

Series and Parallel RLC Circuit [closed]

I am trying to build a resonant circuit for data communication between coils. Which would be better, a series or a parallel resonant circuit? What is the difference between them and in which ...
M.Arun kumar's user avatar
2 votes
2 answers
420 views

TL494 minimum operating voltage VCC

Has anyone operated TL494 on +5VDC practically as it works in simulation software ? minimum operating voltage indicated in datasheet is +7VDC . please confirm.
Anil KG's user avatar
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1 vote
1 answer
403 views

LLC resonant converter with air core

Is it possible to do an LLC resonant converter with an air core transformer (wireless power transfer)? I've read basics about it but I've all read that they use some type of ferrite cores. I think ...
user139731's user avatar
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0 answers
37 views

Power Connectors for higher frequencies

I am currently involved in developing a resonant-converter for research purposes. One idea was to have two separate boards for each side of the involved transformer, while the heavy transformer could ...
Grebu's user avatar
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2 votes
1 answer
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How to dampen a royer oscillating power circuit [closed]

I have a great open-source board for induction heating here from Fluxeon which uses a Royer oscillator. It does a pretty good job and I already had it delivering power up to 1.5kW. However I continue ...
MrLeeh's user avatar
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1 vote
4 answers
2k views

Can I increase current using AC resonance?

In a resonance, specially if we resonant at the natural frequency, the generated waves' intensity will add up thus resulting in a wave of ever increasing intensity. This phenomena is responsible for ...
nemewsys's user avatar
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1 vote
0 answers
185 views

resonant frequency in a series resonant converter circuit

I am designing a series resonant converter and wanted to convert 700 VDC to 100 VDC by using galvanic isolation. The switching frequency should be about 300 kHz (the output load is R = 1\$\Omega\$). ...
SalPaz's user avatar
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6 votes
1 answer
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Induction cooker - highly irregular power transfer curve

I’ve designed a Class D series resonant inverter, for use in an induction cooking application, which is displaying a strange behavior in its measured current vs frequency curve. The topology, ...
swineone's user avatar
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1 vote
2 answers
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Is it possible to convert a low frequency signal into a higher frequency signal?

I have a signal generator that has an adjustable frequency range that is below the required frequency that I need. Is it possible to input a signal from my generator into a passive series RLC filter ...
Richard J's user avatar
1 vote
1 answer
266 views

Tune L C resonant circuit with semiconductors

I have an air coupled transformer consisting of a primary L C resonant circuit fed with feedback transistors and a secondary L C circuit feeding a bridge recitfier to power a small circuit over an air ...
dronus's user avatar
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1 vote
1 answer
7k views

Coil design for induction cooking system

I am designing an induction heating circuit using a half bridge, series resonant circuit. Wildly simplified schematic follows (will use IGBTs instead of MOSFETs for the final design, but they were not ...
swineone's user avatar
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3 votes
3 answers
643 views

What does the line "edge resonance between an inductor and a capacitor" exactly mean?

I am working on a project on DC DC converters in which the concept of soft switching i.e, zero voltage switching (ZVS) and zero current switching (ZCS) are used. One method to attain this is using an ...
Norina Samson's user avatar
-1 votes
1 answer
2k views

Real power and power factor for resonant RLC parallel circuit [closed]

I have no problem finding parts a, b and c, however I don't know how to get part d. You don't have to solve it for me(although it'd be greatly appreciated), but please give me somewhat of a hint or a ...
Shideh's user avatar
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3 votes
3 answers
4k views

Four transistor/full bridge version of the Royer oscillator

For some time now, I have been trying to figure out what (in theory) would be the most efficient way transfer power across a transformer. Applications include high voltage power supplies and induction ...
Alex Eftimiades's user avatar