jonnyGURU Forums
Home Site Search Reviews Articles Contest Links PSU FAQs  


Go Back   jonnyGURU Forums > General Electronics > Electronic Component Discussion

Electronic Component Discussion Discussion of anything pertaining to electronics and the components that make them work

Reply
 
Thread Tools Display Modes
  #1  
Old 11-30-2018
rgbodosk rgbodosk is offline
500W User
 
Join Date: Aug 2018
Location: Korea
Posts: 75
Thanks: 32
Thanked 5 Times in 4 Posts
Default Is it possible to combine double forward with LLC?

I saw a budget psu which utilizes LLC resonant converter(SF-*00P12A), but it looks like standard double forward one except LLC. Is it possible to combine double forward with LLC?
Reply With Quote
  #2  
Old 11-30-2018
-The_Mask-'s Avatar
-The_Mask- -The_Mask- is offline
ssssssmokin'
 
Join Date: Jun 2010
Location: The Netherlands
Posts: 5,000
Thanks: 361
Thanked 1,447 Times in 951 Posts
Default

https://goo.gl/images/wsjaPp
This one has three transformers, main transformer, 5Vsb and one for the LLC resonant tank. Source is offline, but is still in the Google cache.
Reply With Quote
The Following User Says Thank You to -The_Mask- For This Useful Post:
rgbodosk (11-30-2018)
  #3  
Old 11-30-2018
rgbodosk rgbodosk is offline
500W User
 
Join Date: Aug 2018
Location: Korea
Posts: 75
Thanks: 32
Thanked 5 Times in 4 Posts
Default

Quote:
Originally Posted by -The_Mask- View Post
https://goo.gl/images/wsjaPp
This one has three transformers, main transformer, 5Vsb and one for the LLC resonant tank. Source is offline, but is still in the Google cache.
Is it double forward? How can I distinguish topology easily?
Reply With Quote
  #4  
Old 11-30-2018
-The_Mask-'s Avatar
-The_Mask- -The_Mask- is offline
ssssssmokin'
 
Join Date: Jun 2010
Location: The Netherlands
Posts: 5,000
Thanks: 361
Thanked 1,447 Times in 951 Posts
Default

Quote:
Originally Posted by rgbodosk View Post
Is it double forward?
No it has an extra transformer. Which is needed for a LLC resonant design, that's the most noticeable.
Quote:
How can I distinguish topology easily?
Primary switching controller. Or if you have looked at so many power supplies it's mostly doable by just looking at the layout and used components, if you can't see or have a good picture from the primary switching controller.
Reply With Quote
  #5  
Old 11-30-2018
rgbodosk rgbodosk is offline
500W User
 
Join Date: Aug 2018
Location: Korea
Posts: 75
Thanks: 32
Thanked 5 Times in 4 Posts
Default

Quote:
Originally Posted by -The_Mask- View Post
No it has an extra transformer. Which is needed for a LLC resonant design, that's the most noticeable.

Primary switching controller. Or if you have looked at so many power supplies it's mostly doable by just looking at the layout and used components, if you can't see or have a good picture from the primary switching controller.
Sorry for my bad comprehension, so you mean that half or full bridge topology can only utilize LLC resonant?
Reply With Quote
  #6  
Old 11-30-2018
jonnyGURU's Avatar
jonnyGURU jonnyGURU is offline
Site Founder
 
Join Date: Oct 2006
Location: jonnyGURU forums, of course!
Posts: 15,301
Thanks: 489
Thanked 1,995 Times in 1,236 Posts
Default

Not only do I think it's not possible.. I don't know why you would.

If you need better low load efficiency, you can get an LLC controller that also supports burst mode.

https://www.semanticscholar.org/pape...bbe8d1c52f0645

Is that what you're seeing?
__________________
Rest in peace Mike Clements, aka "Yellowbeard"

Rest in peace Joerg Theissen, aka "GI Joe"
Reply With Quote
The Following User Says Thank You to jonnyGURU For This Useful Post:
rgbodosk (11-30-2018)
  #7  
Old 12-01-2018
ashiekh's Avatar
ashiekh ashiekh is offline
20W User
 
Join Date: Oct 2017
Location: Grand Junction, CO
Posts: 1,431
Thanks: 53
Thanked 102 Times in 93 Posts
Default

Quote:
Originally Posted by rgbodosk View Post
Is it possible to combine double forward with LLC?
One generates 12V by some method and then 3.3 and 5V from this (hence double forward); as far as I understand, how one generates the 12V is independent of if one wants to convert again.
Reply With Quote
  #8  
Old 12-02-2018
rgbodosk rgbodosk is offline
500W User
 
Join Date: Aug 2018
Location: Korea
Posts: 75
Thanks: 32
Thanked 5 Times in 4 Posts
Default

Quote:
Originally Posted by -The_Mask- View Post
No it has an extra transformer. Which is needed for a LLC resonant design, that's the most noticeable.

Primary switching controller. Or if you have looked at so many power supplies it's mostly doable by just looking at the layout and used components, if you can't see or have a good picture from the primary switching controller.
Why does LLC need an extra transformer? For separate power feed to controller?

Quote:
Originally Posted by ashiekh View Post
One generates 12V by some method and then 3.3 and 5V from this (hence double forward); as far as I understand, how one generates the 12V is independent of if one wants to convert again.
I found that LLCs can be only used with Double-Ended topologies.(Actually not quite sure about that)
Reply With Quote
  #9  
Old 12-02-2018
asf14tomcat asf14tomcat is offline
f14
 
Join Date: Sep 2016
Location: VN
Posts: 127
Thanks: 12
Thanked 39 Times in 29 Posts
Default

This is not a tranformers . It just a inductor/coil in resonant tank. in many LLC design use champion cm6901 series they put the LLC controller in the cold area to control the 12v rectifier mosfet. Because hot area and cold area is isolate so they use a small tranformer to link the controller to the pwm/llc mosfet ( driver tranformer) some design they use isolate ic drive like Silicon lab replace the driver tranformer
Finally we have three tranformer cross the hot and cold area in LLC design. It look similar a very old half bridge topology in the pass
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Double forward/DC-DC ashiekh Electronic Component Discussion 17 12-18-2018 01:55 PM
Preview: Zalman ZM600-LX – dual forward power supply @HWI Behemot PC Power Supply Discussion 21 11-28-2016 11:33 AM
One for the Jedi - Combine rope lights on one switch? kao Electronic Component Discussion 1 07-09-2013 11:14 AM
Combine 12V rails for load testing? ~*77*~ Testing Methodology Discussion 10 05-21-2010 02:45 AM
NZXT split/combine 12v but 2 trnsfrmrs?? newhit PC Power Supply Discussion 8 04-18-2007 06:14 AM


All times are GMT -4. The time now is 10:32 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright © JonnyGURU.com 2000 -