Surse SMPS rezonante/cvasirezonante

[Vizitator]

Forma de unda sinusoidala pe capacitor.

[Vizitator]

Am gasit postari cu sonde de curent realizate pe diverse toruri:

LE: Am lipit rapid un LLC cu traf tv Elcrom (1mH primar?) si o bobina de PFC de 230microH.

Din film am selectat 3 situatii:

ZVS la frecventa mare, ZVS la frecv mai mica si intrarea in ZCS.

Fara traf curent mai greu sa stiti unde va aflati, sdica prin urmarirea defazajului cum s-a scris mai sus.

Editat Noiembrie 12, 2016 de Vizitator

[Vizitator]

De la lume adunate:Hi All,I have finished building a 1kW SMPS with PFC that I designed to power upmy class AB audio amplifier.The main characteristics are:Input voltage: 180...265VACOutput voltage: +/-55VDCOutput current: 10A/rail --> total output power 1.1kWTopology: ZVS Series resonant half bridge with BCM PFC. The switchingfrequency is the tank resonant frequency or slightly above itto ensure ZVS of bridge FETs. The output voltage is not regulatedand basically tracks the PFC voltage (385V) which is looselyregulated.Resonant frequency: 100kHzPFC Voltage: 385VDCMagnetic parts----------------Transformer: core: ETD44 3F3 no gap materialprimary: 28T 100x0.1 Litz wiresecondary: 2x8T 200x0.1 Litz wireResonant choke: core: PQ2625 3C90 materialinductance: 27uH gap adjusted for proper Lwinding: 18T 120x0.1 litz wirePFC choke: core: PQ3230 3C90 materialinductance: 100uH gap adjusted for proper Lwinding: 30T 120x0.1 litz wireNote: this SMPS is designed for peak power of more than 1kW, is not intended for continuous use at 1kW (transformer too small....).I have finished to build it but not yet powered up.... I am a bit scary of what can happen if something goes wrong...LE: si de pe AudioI used EER4220 core, 6mm spacing between primary and secondary, i use litzwire, 32x0.19 for primary, 16 turns, 32-40-50-64x0.2mm for secondary, depending on the output voltage and number of turns. for 24V 2x2 turns, 48V 2x4 turns, 72V 2x6 turns. Lm=150uH Lp=30uH. the centre leg of the core is grinded to about 0.4mm.LLC converters operate in variable frequency domain to achieve ZCS & ZVS at various loads, thereby the transformer core needs to be bigger in size and also gap at center pole is needed to stay away from saturation. Seldom these converters are used beyond 1-2kw range.I don't find their advantage in audio smps.A simple quasi-resonant smps[QSC patented it under the name "discontinuous resonant mode" but virtually used by every pro-audio company and chinese copy cats] can pump out more than 1.5KW from ETD44 if things were done correctly. Just put an inductor and cap in series with transformer primary [calculated values of L & C to achieve resonance at specific F] with a normal fixed frequency half bridge smps and you get current thru trafo following sinusoidal pattern enabling ZCS at high loads.For more stringent need switch to Phase Shifted Full bridge Resonant converter to get ultimate in robustness and efficiency at multi-kilowatt levels.Well, IMHO half bridge is about the same difficoulty as two switch forward (there is a need for high-side MOSFET drive).LLC converters are not that hard to design. Most manufacturers do it a bit complicated. Howerver if you do not need PFC, then you also do not need an LLC converter for audio, really.For an audio amp the regulation of rail voltage is not so mandatory. It is only mandatory that tha rail voltages should no drop below a certain limit (the limit is quite subjective, it is up to you).For Class-D amplifiers, it is usually good to use the lowest voltage MOSFET needed, up to its highest voltage limit.Normally a series resonant converter does the job for the audio amp supply, if you do not need PFC and an 220-240VAC input voltage is enough, specially if it has a burst mode operation. it will help to regulate rail voltages so, that it does not exceed MOSFET rating, but will not loose so much peak output power.However PFC is highly needed for high power amp. Not really for the 1,00 Power factor, but for other: an audio amp can drove very high peak currents, and very small average currents.At one ocassion my band had to perform outdoor on diesel generators. You could see the light blinking to the beat of the bass drum.Amps with PFC will include a 10-20Hz low pass filter in the PFC feedback network, so the current inrushes will be limited. But you either:- need lot of capacitors both at primary and secondary- need medium lot of capacitors at priamry and a converter with regulation at wide imput voltage range. So here bumps on LLC converterAlso there are differences:- most of the time the converter will operate from the mean input voltage, so efficiency can be maximised for it. At the sides of input voltage range it onyl enough if it tolerates it (can regulate output), the fficicency can be smaller.- without PFC the converter must operate with high gain at high loads (input votlage is decreased), and with <1 gain at low loads.

Editat Noiembrie 12, 2016 de Vizitator

[maxente]

De la lume adunate:Hi All,I have finished building a 1kW SMPS with PFC that I designed to power upmy class AB audio amplifier.The main characteristics are:Input voltage: 180...265VACOutput voltage: +/-55VDCOutput current: 10A/rail --> total output power 1.1kWTopology: ZVS Series resonant half bridge with BCM PFC. The switchingfrequency is the tank resonant frequency or slightly above itto ensure ZVS of bridge FETs. The output voltage is not regulatedand basically tracks the PFC voltage (385V) which is looselyregulated.Resonant frequency: 100kHzPFC Voltage: 385VDCMagnetic parts----------------Transformer: core: ETD44 3F3 no gap materialprimary: 28T 100x0.1 Litz wiresecondary: 2x8T 200x0.1 Litz wireResonant choke: core: PQ2625 3C90 materialinductance: 27uH gap adjusted for proper Lwinding: 18T 120x0.1 litz wirePFC choke: core: PQ3230 3C90 materialinductance: 100uH gap adjusted for proper Lwinding: 30T 120x0.1 litz wireNote: this SMPS is designed for peak power of more than 1kW, is not intended for continuous use at 1kW (transformer too small....).I have finished to build it but not yet powered up.... I am a bit scary of what can happen if something goes wrong...

Daca se poate, puneti si link-ul catre sursa asta

[Vizitator]

http://electronics.forumsee.com/a/m/s/p12-53786-0366610--1kw-resonant-smps.html

 

LE: si inca un film cu LC serie, traf ATX nemodificat, sarcina 0,5ohm pe inf de 5V a trafului.

Editat Noiembrie 12, 2016 de Vizitator

[Mircea Crisan]

De la lume adunate:Hi All,I have finished building a 1kW SMPS with PFC that I designed to power upI have finished to build it but not yet powered up.... I am a bit scary of what can happen if something goes wrong...LE: si de pe Audio

Pai? Si continuarea?

[Vizitator]

Transformer: core: ETD44 3F3 no gap material

primary: 28T 100x0.1 Litz wire
secondary: 2x8T 200x0.1 Litz wire
Resonant choke: core: PQ2625 3C90 material
inductance: 27uH gap adjusted for proper L
winding: 18T 120x0.1 litz wir

Resonant frequency: 100kHz

 

Era numai un punct de plecare daca nu avem profesionisti sa-i ajute la proiectare.

Diferenta ar fi ca Maxente nu e asa sperios.

Deci continuarea este la ei, eu chibitez ca un pensionar.

Azi am pus 2 bobine serie cu mos-urile in montajul de ieri si varfurile de curent in ZCS s-au redus mult.

Editat Noiembrie 13, 2016 de Vizitator

[maxente]

Zilele trecute am gaurit si eu placa mare.

Mai am sa fac gaurile pe radiator si sa vad de unde iau un traf mic sa alimentez oscilatorul si comanda.

Mie nu mi-e frica de sursa asta, sper doar sa imi mearga cumva in rezonant. Daca nu reusesc, raman la semipunte normala si asta e viata.

[Mircea Crisan]

Transformer: core: ETD44 3F3 no gap material

primary: 28T 100x0.1 Litz wire

secondary: 2x8T 200x0.1 Litz wire

Resonant choke: core: PQ2625 3C90 material

inductance: 27uH gap adjusted for proper L

winding: 18T 120x0.1 litz wir

Resonant frequency: 100kHz

 

Era numai un punct de plecare daca nu avem profesionisti sa-i ajute la proiectare.

Diferenta ar fi ca Maxente nu e asa sperios.

Deci continuarea este la ei, eu chibitez ca un pensionar.

Azi am pus 2 bobine serie cu mos-urile in montajul de ieri si varfurile de curent in ZCS s-au redus mult.

 

Pai a mers ce vroia baiatul ala sa faca? Asta era intrebarea.

Dupa parerea lu' mata "functioniren" au ba?

 

@Maxente daca nu-ti iese iti lansez o colaborare la un proiect comun de sursa rezonanta.

Am imbatranit si nu mai am rabdare la detalii si mi-ar prinde bine un ajutor.

 

Mircea.

[Vizitator]

Sa fiu un pic ironic, dar in gluma, sa nu se supere Marian.

In 500 euro, va dau proiectul meu complet, cu totul.

 

Ontopic (sa nu se supere Marian), Maxente, finalizeaza treaba, cum stii tu mai bine, cu calcule, cu alte alea, si daca nu iese dupa gindirea ta, te ajut eu sa iasa dupa practica mea, dar ma asculti la singe!

[hpavictor]

Sa fiu un pic ironic, dar in gluma... finalizeaza treaba, cum stii tu mai bine, cu calcule, cu alte alea, si daca nu iese dupa gindirea ta, te ajut eu sa iasa dupa practica mea, dar ma asculti la singe!

...ma asculti in sange ... ???

Ce stie , stie bine de tot , cu sau fara sange !

[Vizitator]

Trebuie sa reuseasca si el sa faca acel smps cum trebuie.

Stii bine ca eu nu fac decit calcule de baza, esentiale, iar restul se face din "components value adjusting", mai ales in SMPS, unde citiva mm de traseu, pot schimba situatia cu 180 grade, in bine sau in rau (de cele mai multe ori).

[maxente]

...ma asculti in sange ... ???

Ce stie , stie bine de tot , cu sau fara sange !

Ce stiu, stiu de aici de pe forum in mare parte.

N-am facut scoli in sensul asta, iar daca am facut ceva, am pus pe forum sa faca si altcineva si am ajutat atat cat m-a dus pe mine capul

Ramane de vazut daca merge si cum merge

[hpavictor]

@maxente !

[costyy86]

Pai a mers ce vroia baiatul ala sa faca? Asta era intrebarea.

Dupa parerea lu' mata "functioniren" au ba?

 

 

 

http://www.diyaudio.com/forums/power-supplies/270846-1kw-resonant-smps.html