Lahat ng questions related sa Switched-Mode Power Supply (SMPS)

[RaffT]

heheh dapat talaga ang MUR sa output side na, sayang pagka hv nun.baka sa RS may benta sila.

@drin,
rather than following blindly for schematics on net(no offense pinoy_tech), i-google mo kung paano gumagana ang chip. sa g**gle marami ka makukuhang info nyan.

[Disabled]

ok thanks +1 po sa inyong dalawa.
di ba ung KA7500C = TL494?
ung mur kasabay yan nung LM3875

[???]

^Ano na naman ang niluluto mo sis?

[Disabled]

secret
 

Q: paano tanggalin ung EI core na hindi nabibiyak? ibabad sa thinner?

[Disabled]

EDIT
ilang turns ung para sa EE 33? ung nakukuha sa PC PSU
input : 12vdc
output : ppde ba 35-0-35?
or pde na rin 27-0-27.

[rdpzycho]

Q: paano tanggalin ung EI core na hindi nabibiyak? ibabad sa thinner?

yup.

EDIT
ilang turns ung para sa EE 33? ung nakukuha sa PC PSU
input : 12vdc
output : ppde ba 35-0-35?
or pde na rin 27-0-27.

kung same frequency ang gamit, retain mo lang yung orig na 12V winding then compute the ratio for 35V or 27V at your desired duty cycle target. otherwise, kung ibang frequency, kailangan i-recompute lahat.

[Disabled]

hala. binaklas ko na lahat

[Disabled]

ok nagawa ko na kaso naghihingalo ung supply.
kung papalakasan ung volume eh babagsak ( from 50 down to 20 ~ 30 ).
1 pair of mosfet palang.
kung 2? mas lalakas ba ung current?

[Pinoy_Tech]

ok nagawa ko na kaso naghihingalo ung supply.
kung papalakasan ung volume eh babagsak ( from 50 down to 20 ~ 30 ).
1 pair of mosfet palang.
kung 2? mas lalakas ba ung current?

you have this already, add ko na rin dito. The previous one is designed for 200W.
This one is intended for 600W car audio >>> http://i50.tinypic.com/2j2ia8o.jpg

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break... break!    may tanong lang (attn:G-neo) sa mga smps designers

i'm converting standalone tny268 10w smps to 1kw, ano ba ang problerma sa diagram kong ito?



this is just a concept dagram. the target is to make the simplest hi power smps in the world! 

[drin20]

may katanungan po ako.

1. sa na katay ko transformer sa PSU ay

primary : 4 turn center tap
secondary : 19 turn center tap

kung ang input voltage ko po ay 12 volts (push-pull topology po gamit ko SMPS)
114 volts lang po ba dapat output ko sa secondary?

2. pwedi na po ba gawin power supply ng mga CFL and 310 VDC? kahit high frequency? diba 60hz lang input ng CFL? after rectification po ba. parang battery na rin ba ang mga power supply? at wala ng frequency?

[TinTopHack]

break... break!    may tanong lang (attn:G-neo) sa mga smps designers

i'm converting standalone tny268 10w smps to 1kw, ano ba ang problerma sa diagram kong ito?



this is just a concept dagram. the target is to make the simplest hi power smps in the world! 

From 10W to 1KW - do not expect it to be a simple upgrade. The topology for 10W more often than not will not work for hi power apps.

For example simple SMPS circuits for 10W may get away without snubbers for MOSFETS and rectifiers like the ones shown on your circuit. But at hi power applications you will need snubbers or your mOSFETs and rectifiers will fail.

To go from 10W to 100W will already be challenging enough considering the modifications required. To go from 100W to 1KW will not be just 10 times more challenging it could 100 times more challenging. The challenge and complexity can grow exponentially.

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^ ang hirap nga   lalo pat ang kailangan ay simply lang but w/ all the hi end specs  

i'm still here reminiscing the past  



i cannot switch squarewave without garbage!!  

 

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the hardest part of hi-power smps is switching the power transformer on and off at hi-speed which is very illegal in electrical eng'g point of view.  

...solution could be waveshaping or a special transformer that is design for this insanity  

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sample captured problem  



switching the power transformer on and off at hi-speed!  

bogbog sarado ang x-f  

@ g-neo ano ba ang latest na remedy dito?

[RaffT]

simple design AND high-end specs usually don't MIX.

[rdpzycho]

sayang lang 'yung double trafo kung booster type ang gagawin. single trafo with the same number of MOSFET's kayang-kaya na 'yan. mas mahal magpagawa ng trafo for these designs kaysa bumili ng bagong controller at MOSFET. nakakita na ako ng designs with stacked cores at 1kW levels, special 'yung bobbin niya. though, mas madalas 'yun sa toroid, wala ng special bobbin. ang typical na nahahawakan namin sa opisina is 1kW minimum, 5kW to 8kW 'yung malalaki.

'yung spikes, nagagawan ng paraan 'yan. snubbers ang pinakamadali. parasitic capacitances ang cause niyan then realistic turn on and turn off times (example 'yung rectifier na kailangang i-charge 'yung capacitance niya sa transition from turn on to reverse bias), discharging in the transitions. kung babagalan 'yung transition, mababawasan din 'yan. pwede ring i-damp lang.

pwede ring resonant topologies, mga zero voltage crossing switchers. medyo iba nga lang ang trafo design nito. pero doon sa mga ginagawa namin, 'di pa ako nakakakita ng completely resonant topologies, mostly, intelligent controls lang, may additional DSP controller bukod pa doon sa PWM controller.

kapag na-solve na lahat 'yan, pwede pang i-push 'yung design to use higher frequency para lumiit 'yung magnetics. sa mobo design, hindi uncommon ang 500kHz to 1MHz switching frequency. 'yung lumang mobo ko (circa 2006), 250kHz na ang switching frequency sa CPU, 'di ko pa nasukat 'yung sa mga bago.

[_basura_man()]

break... break!    may tanong lang (attn:G-neo) sa mga smps designers

i'm converting standalone tny268 10w smps to 1kw, ano ba ang problerma sa diagram kong ito?



this is just a concept dagram. the target is to make the simplest hi power smps in the world! 

mas ok yung resonant dito using half bridge or fullbridge kaso lossy sa mababang load due to energy na umiikot sa resonant tank, i think magandang gawin yung LLC resonant topologies basta amit na gamit yung full loads para mababang losses, mataas yung efficiency.

[♪ ♫ ♫ ♪ ♪ ♪ ♫ ♫ ♫]

simple design AND high-end specs usually don't MIX.

simplify the hi-end lang sis.

sayang lang 'yung double trafo kung booster type ang gagawin. single trafo with the same number of MOSFET's kayang-kaya na 'yan. mas mahal magpagawa ng trafo for these designs kaysa bumili ng bagong controller at MOSFET. nakakita na ako ng designs with stacked cores at 1kW levels, special 'yung bobbin niya. though, mas madalas 'yun sa toroid, wala ng special bobbin. ang typical na nahahawakan namin sa opisina is 1kW minimum, 5kW to 8kW 'yung malalaki.

'yung spikes, nagagawan ng paraan 'yan. snubbers ang pinakamadali. parasitic capacitances ang cause niyan then realistic turn on and turn off times (example 'yung rectifier na kailangang i-charge 'yung capacitance niya sa transition from turn on to reverse bias), discharging in the transitions. kung babagalan 'yung transition, mababawasan din 'yan. pwede ring i-damp lang.

pwede ring resonant topologies, mga zero voltage crossing switchers. medyo iba nga lang ang trafo design nito. pero doon sa mga ginagawa namin, 'di pa ako nakakakita ng completely resonant topologies, mostly, intelligent controls lang, may additional DSP controller bukod pa doon sa PWM controller.

kapag na-solve na lahat 'yan, pwede pang i-push 'yung design to use higher frequency para lumiit 'yung magnetics. sa mobo design, hindi uncommon ang 500kHz to 1MHz switching frequency. 'yung lumang mobo ko (circa 2006), 250kHz na ang switching frequency sa CPU, 'di ko pa nasukat 'yung sa mga bago.

torroid with inter winding and layer miracle could be an answer    i just dont know how    core damping through special winding, sis?

whats really wrong is the x-f was switch on/off, so the solution is to make a x-f that can be switch on and off   thanks for the input sis!!

core damping and interlayer and winding damping would be nice but how? 

mas ok yung resonant dito using half bridge or fullbridge kaso lossy sa mababang load due to energy na umiikot sa resonant tank, i think magandang gawin yung LLC resonant topologies basta amit na gamit yung full loads para mababang losses, mataas yung efficiency.

ok noted thanks!

[rdpzycho]

sa mga ginagawa namin, sa inductor lang ginagamit ang toroidal cores, EE or ETD cores pa rin ang gamit sa trafo.

nakakita na ko ng trafos used as high as 200kHz sa mga high power supplies na ginagawa namin, nothing special with the windings or the materials, sa topology at snubber ang mga sikreto. meron ding gumagamit ng Controlled Snubbers, depende sa load (current sensing) 'yung activity nung snubber.