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Questions tagged [resonant-converter]

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

1
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1answer
38 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 ...
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0answers
36 views

2 MOSFET DC to AC Inverter Design (Wireless Charging)

For one of my projects, I am trying to create a wireless charging station for a LiPo battery. For my input, I'm taking the standard 120 Vrms, 60 Hz voltage source I get from a outlet. From initial ...
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0answers
20 views

Parallel resonant fullbridge, why two matching inductors instead of one?

Most resonant inverters use two matching inductors instead of one, while the same inverter only using a half bridge, use only a single matching inductor, why is that? Full bridge uses LLCLR while a ...
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1answer
28 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 ...
0
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0answers
26 views

Derivation of the equivalent model of a resonant converter

I'm trying to understand how a resonant converter works, but one thing confuses me, and this thing is the derivation of the equivalent model using first harmonic approximation (FHA) method. At first ...
2
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2answers
31 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.
0
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0answers
96 views

tank circuit drawing current at no load when in resonance (induction heater)

I'm currently building an induction heater, and mainly interested how it works and why it works, my induction heater is coupled to the work coil which is an LC circuit. Now, if i get near resonance ...
0
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1answer
137 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 ...
0
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0answers
26 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 ...
2
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1answer
447 views

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 ...
1
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4answers
991 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 ...
1
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0answers
128 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\$). ...
4
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1answer
842 views

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, ...
1
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2answers
125 views

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 ...
1
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1answer
153 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 ...
1
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1answer
4k 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 ...
2
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3answers
402 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 ...
-1
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1answer
1k 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 ...
3
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3answers
3k 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 ...
0
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2answers
463 views

Can a Cockcroft–Walton generator exhibit resonant rise?

I set up what I believe to be a working royer converter, however I did modify it to use a pair of op amps rather than transistors (see below.) Anyway, instead of hooking the secondary to an lc tank, ...
1
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3answers
496 views

Is it possible to build a inverter that operates at a frequency set by an LC tank using ONLY that LC tank and transistors?

I was always dissatisfied with inverters because it seems like an LC tank and transistors would be all you need. However, after much time spent simulating and a few false positives experimenting, I am ...
17
votes
2answers
8k views

Electronic Drivers for Fluorescent Lamps: How is the DC-to-AC Conversion done?

Pretty much all (somewhat inaccurately named) electronic ballasts for fluorescent lamps run off a DC voltage and have to convert it into AC to operate the lamp. The DC supply can come from rectified ...
2
votes
1answer
2k views

Setting correct operating frequency for LLC resonant SMPS

I need to figure out if an LLC half-bridge resonant SMPS is designed (more or less) correctly. I am not an SMPS designer, and neither is the manufacturer, so I'm just reading a bunch of app notes and ...
10
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2answers
3k views

What is the use of transformers with 3 pairs of wires?

I found a device which has a ferrite core and 3 coils on it. It looks like some type of transformer. What would be its use? I found it in a compact fluorescent lamp.