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Schematic and measuring results for Connexelectronic SMPS300RE
Schematic and measuring results for Connexelectronic SMPS300RE
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Old 14th September 2015, 04:51 PM   #1
tiefbassuebertr is offline tiefbassuebertr  Germany
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Default Schematic and measuring results for Connexelectronic SMPS300RE

Who can upload this or sending links therefore of this SMPS:
Connexelectronic
Also of interest is the used IC for oscillating - go to
https://hifiduino.files.wordpress.com/2012/04/300re.jpg
Thanks in advance.
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Old 18th September 2015, 09:25 PM   #2
Cresnet is offline Cresnet  Jordan
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Schematic and measuring results for Connexelectronic SMPS300RE
Quote:
Originally Posted by tiefbassuebertr View Post
Who can upload this or sending links therefore of this SMPS:
Connexelectronic
Also of interest is the used IC for oscillating - go to
https://hifiduino.files.wordpress.com/2012/04/300re.jpg
Thanks in advance.
What kind of information's you are looking for?

Cannot open the first link !

However the IC is L6599
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http://www.diysmps.com

Last edited by Cresnet; 18th September 2015 at 09:35 PM.
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Old 19th September 2015, 01:47 AM   #3
twest820 is offline twest820
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L6599A, to be specific; a little additional info in this thread. Search also this thread.

Christi's been pretty clear in other threads schematics are for customers only. I've cached copies of the few he used to provide for public download but it'd inappropriate to share them as the IP's now restricted.
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Old 26th September 2015, 09:42 AM   #4
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by Cresnet View Post
What kind of information's you are looking for?

Cannot open the first link !

However the IC is L6599
I am looking for an detailled commonly circuit describtion (theory of operation) so as for special features, what make this approach very suited for audio applications.
The first link goes open at my web access, but the there mentioned pdf link is definitely death. I have found as replacement this pdf-file:
http://www.audiophonics.fr/images2/6189/SMPS300R.pdf
If the first link doesn't goes open, here the text information from there:
================================================== ===
SMPS300RE is a dedicated Switched Mode Power Supply for Audio Amplifiers. Enhanced Version of the previous SMPS300R, with dual CLC filter on the output section and compact profile power transformer, suitable for low-noise and high-end Power Amplifiers, both Class AB and Class D/T. It uses Half Bridge resonant topology, capable of delivering 300W continuous and up to 400W peak power with crest factor at least 2.5. SMPS300RE has by default differential output voltage, for single output voltage, refer to SMPS300RS. The stock available output voltages are adjustable within approx. 10% and the ordered voltage value is at the middle of the interval. For example the 30V version can be adjusted from 28V to 32V. In this way, the available voltage versions covers almost all the voltage range from 22V to 75V or eve more when custom voltage is chosen. The main feature of this power supply is the absence of the heatsinks both for power switches and rectifier diodes, due to increased efficiency, up to 94.6% for higher voltage versions, due to the fact that the transistors are soft-switched, and the current through the switches has sinusoidal shape, and there are no additional losses in output inductors. Also, the amount of EMI is much lower than any competitor's SMPS especially the old, hard-switched type commonly found on the market and could be compared with a high quality linear regulated power supply. The size and weight is greatly reduced, allowing to install the SMPS300R to be installed into low profile case, with it's 100x100mm and 32 to 40mm tall depending on the voltage version and capacitors used. The SMPS300R features over-current protection which limit the output current at about 130% of the maximum peak power, about 400W.

This power supply is suitable for both class AB and class D/T amplifiers, which have the PSRR greater or at least 57dB. Target applications for this power supply unit include the TA2022 based amplifiers, TDA8920 or TDA8950 based amplifiers and IRS2092 amplifiers for the +-27V or +-36V version as well as other vendors amplifiers such as Hypex UCD180 Amplifier modules, TK2050 amplifiers or TDA7293/4 amplifiers.

================================================
BTW - thanks for your advice to the SMPS IC L6599 from ST:
http://www.st.com/web/catalog/sense_...SC354/PF129679
Quote:
Originally Posted by twest820 View Post
L6599A, to be specific; a little additional info in this thread. Search also this thread.

Christi's been pretty clear in other threads schematics are for customers only. I've cached copies of the few he used to provide for public download but it'd inappropriate to share them as the IP's now restricted.
Good advices, thank you.
http://www.diyaudio.com/forums/vendo...ml#post4243283
http://www.diyaudio.com/forums/power...ansformer.html

Last edited by tiefbassuebertr; 26th September 2015 at 09:48 AM.
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Old 26th September 2015, 01:02 PM   #5
twest820 is offline twest820
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Quote:
Originally Posted by tiefbassuebertr View Post
I am looking for a detailed circuit describtion (theory of operation) so as for special features, what make this approach very suited for audio applications.
There's lots of information on series LLC resonant supplies around; how much have you already checked out?

Ripple specifications in theory can provide some indication of the hardness of the switching---softer being the main differentiator of resonant supplies for audio purposes---but unless measurement conditions are stated they're difficult to compare. One also needs to know details of the secondary bridge and output filter to control for its source impedance and these aren't given by any manufacturer I'm aware of. So answering the question of how the SMPS300RE differs from <other supply of interest> is most easily done by acquiring both and measuring. The quality of the supply's power stage implementation, Y cap management of the secondary's output position, and the nature of the load's PSRR are all significance here. It's so far unclear to me if resonant necessarily delivers a cleaner audio output than, say, forward.

The other top consideration I see for audio is regulation of half bridge loads (class AB, class B, most class D, and sometimes class A to some extent). Typically only one winding is included in the feedback loop and the other tracks through magnetic coupling. Typically Vcc is regulated and Vee follows to an accuracy controlled by the transformer's source impedance, meaning there will be somewhat less error in the positive portion of a half bridge's output than in its negative. How much depends on the supply and the amplifier's loop gain, but it does not seem to be much of an issue in practice. Sometimes Vcc-Vee is instead taken for feedback, rereferencing regulation errors to the centre tap on the secondary. One can devise control schemes operating at other points along this design continuum, potentially being clever to regulate whichever rail is most loaded. But, there being only the one primary input for two secondaries, always the system is underdetermined.

Christi's objected in the past when I've mentioned about Connexelectronic's control loop so I can't, in good faith, say much here. SMPS texts often cover use of a TL431 for feedback, some devoting an entire chapter to it.
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