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Author Topic: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)  (Read 76973 times)

Offline rdpzycho

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1120 on: July 03, 2012, 05:49:33 PM »
Quote from: RaffT on July 03, 2012, 09:52:46 AM
:D simple design AND high-end specs usually don't MIX.

baka high power sis. :D

kahit 'yung mga lumang design na nakikita ko, lahat merong secondary controllers. 'yung mga luma na talaga, hindi MCU or DSP ang gamit, puro mga logic IC's. ang pinaka-purpose nila is to try to make the unit survive when something goes wrong like fluctuating lines or loads, etc.
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1120 on: July 03, 2012, 05:49:33 PM »

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1121 on: July 03, 2012, 05:57:30 PM »
Quote from: rdpzycho on July 03, 2012, 05:47:11 PM
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.

i hope i can resolved the transformer problem without any external components involve sis  :D i hope thier are no transformer principles conflict in doing it  ;D   the tny268 uses fixed frequency transistion at 130khz and damped some pulses depende sa load nito its a bit simple kaya ito napili ko  ;D

torriod core could be the best but still some problem persist  ;D
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1121 on: July 03, 2012, 05:57:30 PM »

Offline rdpzycho

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1122 on: July 03, 2012, 06:01:18 PM »
^ kung mapapadaan niyo rin sa kanya 'yung load pulses sa output magagamit 'yung functions niya. from the diagram kasi sir, hiwalay ng current path 'yung palabas talaga ng output.

MOSFET's easily die without snubbers or any other way to limit switching losses. almost always a given na merong external circuitry bukod pa doon sa main topology pagdating sa high power supplies.
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1122 on: July 03, 2012, 06:01:18 PM »

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1123 on: July 03, 2012, 06:13:06 PM »
plano ko talaga sis is to use a little hi-speed transformer as feedback to solve problems sa hi-voltage output. this could be safe and a simple remedy. protection could be like gfci techniques.

at hi power your right sis, mosfets has a very sensitive input component, i just dont khow yet how to take care with it specially when it is sorrounded by hi-power signals  ;D
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1123 on: July 03, 2012, 06:13:06 PM »

Offline _basura_man()

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1124 on: July 03, 2012, 08:41:48 PM »
pwede ding gumamit ng active clamps sa mosfet sa mga forward derives topologies
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1124 on: July 03, 2012, 08:41:48 PM »

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1125 on: July 05, 2012, 11:25:38 AM »
shock absorbers works at the expense of 6 diodes and 2 capacitors  :(



no ferrite cores yet kaya laro muna sa ckt  ;D ;D ;D


Quote from: rdpzycho on July 03, 2012, 01:43:41 PM
sayang lang 'yung double trafo kung booster type ang gagawin. single trafo with the same number of MOSFET's kayang-kaya na 'yan.

how do you intend to do it sis?

(the first trafo was placed to isolate the tny268 from the hi-power switcher and second trafo is to isolate the load)

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Offline centOS

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1126 on: July 05, 2012, 01:35:17 PM »
pa time in po dito... ganda ng discussion/tutorial

basa mode......
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Offline rdpzycho

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1127 on: July 05, 2012, 03:27:51 PM »
Quote from: <i> on July 05, 2012, 11:25:38 AM
how do you intend to do it sis?

(the first trafo was placed to isolate the tny268 from the hi-power switcher and second trafo is to isolate the load)

gamit ng standard na controller, 'di na 'yung TNY. ang design kasi niyan (physical and internal) para sa small adapters. hindi siya tested para sa mas malalaking EM sa paligid niya. meron din silang levels depende sa type ng adapter at kung may ventilation o wala. medyo marami ako niyan dito sa opisina. ;D

isa pa, ang majority ng design ng mga 'yan ay based sa Flyback. kailangan baguhin 'yung compensation kung sa forward topology gagamitin. may provision kasi sa RHP zero ang mga 'yan. way back my first job, na-encounter ko 'yun nung ginamit ko siya labas sa Flyback. unfortunately, 'yung mga unang versions niyan, walang provision sa compensation.
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Offline TinTopHack

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1128 on: July 05, 2012, 03:55:33 PM »
Quote from: rdpzycho on July 03, 2012, 05:47:11 PM
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.

As you go up the power scale, switching freq and magnetics become more and more important thus your choice of core materials becomes critical, switching losses become more and more significant thus your choice of switching devices and snubbers become critical too.
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1129 on: July 05, 2012, 04:13:35 PM »
na experience ko minsan ang dc-to-dc upto 500W hindi masyadong problema yong switcher dahil lo voltage lang 13.8Vdc using totem pole switch.  itong switching sa 350Vdc ang nakakalula ang spikes wala yatang magsusurvive na components dito  :D
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Offline rdpzycho

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1130 on: July 05, 2012, 04:23:26 PM »
same case lang 'yan sir, parehas lang ang energy requirements sa same power, meron pa ring spikes.

sa TI maraming discussions, marami ring cookbooks.
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1131 on: July 05, 2012, 04:37:41 PM »
ok i'll try flyback switching if i cannot do it in the transformer  ;D    
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1132 on: July 09, 2012, 01:11:20 PM »
Quote from: rdpzycho on July 05, 2012, 03:27:51 PM
gamit ng standard na controller, 'di na 'yung TNY. ang design kasi niyan (physical and internal) para sa small adapters. hindi siya tested para sa mas malalaking EM sa paligid niya. meron din silang levels depende sa type ng adapter at kung may ventilation o wala. medyo marami ako niyan dito sa opisina. ;D

isa pa, ang majority ng design ng mga 'yan ay based sa Flyback. kailangan baguhin 'yung compensation kung sa forward topology gagamitin. may provision kasi sa RHP zero ang mga 'yan. way back my first job, na-encounter ko 'yun nung ginamit ko siya labas sa Flyback. unfortunately, 'yung mga unang versions niyan, walang provision sa compensation.

i read yesterday about conventional smps topology, i found out that my switcher is in the two switch flyback topology. i just use this class b switch to reduce components,  more reliability (transformer) and glitch free switching (follow through inrush and transients).

here:



approaching 2kw without any switching problem. (at least in the sims hehehe)  :D

 
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1133 on: July 09, 2012, 04:24:17 PM »
so good to be true  :D :D :D



whack tahh...zero transients and zero displacement  :o :o :o
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Offline bryanwizard30

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1134 on: July 09, 2012, 04:57:34 PM »
galing po ah
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1135 on: July 09, 2012, 05:10:01 PM »

laro muna ala pa yong core ko  ;D ;D ;D
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1136 on: July 10, 2012, 08:10:03 PM »
nag dredremel nang ferrite.. :D
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1137 on: July 11, 2012, 12:36:21 PM »
pahenge.... ;D
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Offline _basura_man()

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1138 on: July 11, 2012, 01:18:59 PM »
Quote from: insomartin on July 10, 2012, 08:10:03 PM
nag dredremel nang ferrite.. :D
ingat sis,pero pwede naman lagyan ng polyester tape para may gapping kono
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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1139 on: July 11, 2012, 02:58:12 PM »

ellppp!! dumadami na sila   :o



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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1139 on: July 11, 2012, 02:58:12 PM »
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