Electronics Lab Philippines

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

Offline 576Pinoy_Tech

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1320 on: February 22, 2014, 02:15:05 PM »
Are you referring sa mga flyback and the similar smps? Pwede sir pero kailangang i consider yung supply ng IC kung kumuha sya ng supply sa sarili nyang trafo. Depende rin sa IC kung anong min & max V supply na kaya nya, at dahil dun pwedeng maging narrow range lang ang variable output. Mas mainam kung yung IC mismo ay ihiwalang ang supply para mas wide ang Vout range.     

Offline marcelino

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1321 on: February 22, 2014, 03:09:06 PM »
sis, i'm refering to something like this:
http://www.ti.com/lit/ds/symlink/lm2596.pdf


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Offline 576Pinoy_Tech

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1322 on: February 22, 2014, 03:52:57 PM »
Mas pwede yan  ;) .

Offline _basura_man()

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1323 on: February 24, 2014, 10:13:56 AM »
question uli...

pwede bang gawing variable workbench PSU ang SMPS?

Most ng SMPS controller (IC) ay binabago lang ang output based dun sa resistors sa output. Consider, simple switchers from TI/National, may mga adjustable versions sila, which in a way parang tulad lang nung LM317. Of course, magkaiba ang pamamaraan kung papano binabago ang output voltage.
basta covered yung duty cycle kaso basta wag labg zero ang output mag specify ka ng limit sis(e.g. from 24V-12V)
Senior software developer at day, HW and FW hobbyist at night.
Working at http://goo.gl/iM8khM.

Offline drin20

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1324 on: April 22, 2014, 07:13:16 AM »
design by tahmid



http://tahmidmc.blogspot.com/2013/01/using-sg3525-pwm-controller-explanation.html


share ko lang matagal na kasi tambay ang sg3525










thank you

Offline >>>^żżż^<<<

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1325 on: April 22, 2014, 09:26:22 PM »
Hmm minimal components.
http://www.elab.ph/index.php?topic=52236.0 TF?
http://www.elab.ph/index.php?topic=41860 ? ? ? DIY traffo Test Build Uli
http://www.elab.ph/index.php?topic=33717  I2c / spi programmer
http://www.elab.ph/index.php?topic=37150.0 Lcr esr makikigulo rin ba kayo ??? Test Build
http://www.elab.ph/index.php?topic=29963.0 Esr collection na malamig
http://www.elab.ph/index.php?topic=25854.0 Basic C++ Programming Tutorials by Prof Asimo
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Offline drian

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1326 on: April 22, 2014, 11:33:19 PM »
subscribing
Never explain - your friends don't need it and your enemies won't believe you anyway

Dry lips, sabay ngiti....boom Punit!

Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1327 on: January 19, 2015, 04:51:24 PM »
Hi mga master,

Meron ba kayo suggestion for car inverter na controller????

Offline marcelino

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1328 on: November 10, 2015, 08:31:40 AM »
gandang araw....

paclarify naman. confused ako sa transformer sa schematic na ito.



galing yan dito: http://danyk.cz/iz350_en.html

Hindi ko gets yung another 40 turns near the gnd sa primary. Hindi ba pagForward mode, sa itaas lang ng MOSFET ang primary?

At another question, talaga bang dapat 800-1000V ang MOSFET ? Di ba ako pwede gumamit nung 500V rating lang?
Nasa 500V rating lang ang nakikita ko sa mga PSU's.

At clarify ko na din, I will have to determine my own number of turns, depende sa available ko na xformer. Tama, di ba?
"Don't take life seriously. After all, no one has ever come out of it alive. -Bugs Bunny"

Offline motion55

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1329 on: November 10, 2015, 10:33:57 AM »
^^^Actually this design is similar to the Apple II power supply. Ang purpose ng coil sa baba is to return to the supply the excess magnetic energy in the form of flux na di na transfer sa secondary. Kung walang return then the excess flux will be converted to high voltage during fly-back (turn off ng MOSFET). The high voltage will have to be absorbed by the transistor.
"Set your mind free!"

Offline motion55

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1330 on: November 10, 2015, 10:50:54 AM »
Googling here is a reference to the Apple II design.

http://www.righto.com/2012/02/apple-didnt-revolutionize-power.html

Na patent ng Apple ang so called "clamp winding" design. Although the author sa link claims may prior reference sa clamp winding design sa applicatiion notes ng Motorola, etc.

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Offline glutnix_neo

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1331 on: November 10, 2015, 11:02:41 AM »
ate marce, we call it the reset winding, naiipon kasi yung energy sa transformer on every cycle kung wala yan and possibly magcause ng saturation sa loob. gaya ng sinabi ni ate motion, inidadump nya yung excess pabalik sa source or inirereset nya to zero yung energy sa transformer.
Peace Again, Amen!!!

Offline 576Pinoy_Tech

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1332 on: November 10, 2015, 11:21:14 AM »
gandang araw....

paclarify naman. confused ako sa transformer sa schematic na ito.



galing yan dito: http://danyk.cz/iz350_en.html

Hindi ko gets yung another 40 turns near the gnd sa primary. Hindi ba pagForward mode, sa itaas lang ng MOSFET ang primary?

At another question, talaga bang dapat 800-1000V ang MOSFET ? Di ba ako pwede gumamit nung 500V rating lang?
Nasa 500V rating lang ang nakikita ko sa mga PSU's.

At clarify ko na din, I will have to determine my own number of turns, depende sa available ko na xformer. Tama, di ba?

* Hindi ko gets yung another 40 turns near the gnd sa primary.
Yes sir tulad ng sabi nila sa itaas, for resetting nga yan ng primary coil para ready uli for the next fire.
Pwede mo rin syang i configure sa ordinary soft clamp na tulad ng ginagamit sa flyback RCD type snnuber


*Hindi ba pagForward mode, sa itaas lang ng MOSFET ang primary?
Yup, forward mode yan.. ang quick basis ay yung dots, Tr2, at yung free-wheeling diode sa sec.

*At another question, talaga bang dapat 800-1000V ang MOSFET ?
Usually ganyan ang nakikita ko sa mga psu namin ito ang dati kong ginagamit K1342.
Pwede rin naman yung 500V pero medyo mainit nga lang konte.

*At clarify ko na din, I will have to determine my own number of turns, depende sa available ko na xformer. Tama, di ba?
yup pero i consider mo rin sir yung Tr2, nasa 50% ng energy ng secondary ay dyan kumukuha at dahil dyan need talaga yung free-wheeling diode.

hmm, late na ako sa work  ;D  ;D..













Offline marcelino

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1333 on: November 10, 2015, 12:28:14 PM »
@motion55
@glutnix_neo
@576Pinoy_Tech

++pogi!

Maraming Salamat. May bago nanaman akong natutunan. :D

Clarification pa.
Sabi dun sa link, ang Tr1 ay hinati sa dalawang parts. Akala ko, yun dalawang 20z ang hinati nya.
So, 40z-40z nya pala hinati?
"Don't take life seriously. After all, no one has ever come out of it alive. -Bugs Bunny"

Offline motion55

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1334 on: November 10, 2015, 12:35:23 PM »
Quote
At another question, talaga bang dapat 800-1000V ang MOSFET ? Di ba ako pwede gumamit nung 500V rating lang?
Nasa 500V rating lang ang nakikita ko sa mga PSU's.

Kung kinconvert mo ang 230VAC to DC, ang peak value sa 330uF cpacitor is 230*1.414 = 325V.

Ang voltage sa clamp winding ay mag-limit or clamped to at least 325V. Pwede tumaas habang bumabalik ang current to the supply and recharge the capacitor. Assuming ideal ang transformer, walang leakage inductance at perfectly coupled ang clamp winding sa primary winding na naka connect sa MOSFET, then the MOSFET drain voltage will be 325V(from supply rail) + 325V(from transformer winding) = 650V. This exceeds the voltage rating kung 500V lang.

"Set your mind free!"

Offline marcelino

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1335 on: November 10, 2015, 12:42:40 PM »
Kung kinconvert mo ang 230VAC to DC, ang peak value sa 330uF cpacitor is 230*1.414 = 325V.

Ang voltage sa clamp winding ay mag-limit or clamped to at least 325V. Pwede tumaas habang bumabalik ang current to the supply and recharge the capacitor. Assuming ideal ang transformer, walang leakage inductance at perfectly coupled ang clamp winding sa primary winding na naka connect sa MOSFET, then the MOSFET drain voltage will be 325V(from supply rail) + 325V(from transformer winding) = 650V. This exceeds the voltage rating kung 500V lang.

Noted po sir motion. Siguro po kung walang clamp winding, pwede ang 500V-rated transistor. Kaya pala, medyo insistido yung article about 800-1000V transistors.
"Don't take life seriously. After all, no one has ever come out of it alive. -Bugs Bunny"

Offline motion55

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1336 on: November 10, 2015, 12:59:29 PM »
Kung ginawa mong 80 turns ang clamp winding, then ang babalik sa primary ay 80:40 = 325/2 = 163V lang. Then the drain voltage will be 325+163 = 488V. But that is cutting it close.
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Offline marcelino

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1337 on: November 10, 2015, 01:16:03 PM »
Kung ginawa mong 80 turns ang clamp winding, then ang babalik sa primary ay 80:40 = 325/2 = 163V lang. Then the drain voltage will be 325+163 = 488V. But that is cutting it close.

So, di pa po pala kasama ang clamp winding sa calculation of number of turns?

Yes po, malapit na masyado. Hanap nalang po ako ng 800V-rated transistor.
"Don't take life seriously. After all, no one has ever come out of it alive. -Bugs Bunny"

Offline sherlanmamaril

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1338 on: November 10, 2015, 02:10:44 PM »
tambay ako dito akala ko pwm eh memory nun

Offline >>>^żżż^<<<

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Re: Lahat ng questions related sa Switched-Mode Power Supply (SMPS)
« Reply #1339 on: November 10, 2015, 06:17:02 PM »
Same lang ba sa principle ng joule thief iyang clamp winding?
http://www.elab.ph/index.php?topic=52236.0 TF?
http://www.elab.ph/index.php?topic=41860 ? ? ? DIY traffo Test Build Uli
http://www.elab.ph/index.php?topic=33717  I2c / spi programmer
http://www.elab.ph/index.php?topic=37150.0 Lcr esr makikigulo rin ba kayo ??? Test Build
http://www.elab.ph/index.php?topic=29963.0 Esr collection na malamig
http://www.elab.ph/index.php?topic=25854.0 Basic C++ Programming Tutorials by Prof Asimo
We only live once,treasure those we love, make friends not enemies and keep our family closer. And we will be at peace.
FISH