There is an example of decent design along with many design choices explanation and experiments:
https://www.pcbway.com/project/shareproject/_______L6599.html
(It is in Russian so you'll need to use translation. But I really recommend reading it)
Rezalscseek did a good lab work.
I really liked the implementation of its feedback from both power supply poles.
About good THD+N from the power supply under real load.
I want to add that when powering a half-bridged class D gain, everything will be orders of magnitude worse since the pumping effect will disable the feedback.
I really liked the implementation of its feedback from both power supply poles.
About good THD+N from the power supply under real load.
I want to add that when powering a half-bridged class D gain, everything will be orders of magnitude worse since the pumping effect will disable the feedback.
Probably has something to do with the market / design ease ratio. There's probably a much bigger market for "just something" that lights an LED string, divided by a zero design effort (just steal any number of existing, proven Chinese designs, put any effort expended into dumbing down the assembly and component costs any way you can. UL / CSA / TUV certs? Too expensive - as long as your product doesnt kill anybody)
I am researching about synchronous rectification controllers, in particular NCP4318. Question that I have is will it be needed for power supply that is used for amplifier?
Synchronous Rectification is used to minimize conduction losses from regular diodes. For example voltage drop for a diode is 0.7V and for MOSFET it is 0.05V. Efficiency gains are marginal though - in my opinion.
I am thinking to just go for regular rectification on the secondary side.
Synchronous Rectification is used to minimize conduction losses from regular diodes. For example voltage drop for a diode is 0.7V and for MOSFET it is 0.05V. Efficiency gains are marginal though - in my opinion.
I am thinking to just go for regular rectification on the secondary side.
I can certainly see a validity to the argument… I am surprised that even with simulation tools like LTSpice no one designed something decent. Simulator is a shortcut for not doing math, so should be easy to come up with something in bull park
I think too, that regular fast diode will be ok . Reason - high current are in shorter peaks, so overall diode voltage drop power loss is not continous too. Offcourse, more can be gained if SR used for subs or low ohms loads, where current dominates. Otherwise it will just complicate circuit too much.
You will find that that the heatsink required for a diode is substantially bigger than for the MOSFET of a sync rect.
Another advantage of sync rect in an unregulated, i.e. fixed frequency LLC converter is the significant smaller output voltage overshoot under no-load or low-load conditions. My best bet in 2017 was SKR2001 (STM)
Another advantage of sync rect in an unregulated, i.e. fixed frequency LLC converter is the significant smaller output voltage overshoot under no-load or low-load conditions. My best bet in 2017 was SKR2001 (STM)
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So there are three main types of active PFC (power factor correction) types:
Table attached highlights differences between three.
My question is which one is the best for psu used in audio amplifier?
Side note - ST has L4986 that is continuous conduction mode (CCM) PFC controller and L6564 that is Transition Mode PFC controller
- Continuous conduction mode (CCM)
- Critical conduction mode (CRM)
- Discontinuous conduction mode (DCM)
Table attached highlights differences between three.
My question is which one is the best for psu used in audio amplifier?
Side note - ST has L4986 that is continuous conduction mode (CCM) PFC controller and L6564 that is Transition Mode PFC controller
Attachments
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FWIW, cheapo Laptop SMPSs are very good for headphone amps and especially small Class A amps. They give audibly better sound for the later. Class A amps make REALLY nasty noises when they overload on conventional PSs.
Wayne Kirkwood of ProAudio Design Forum has a couple of examples.
Wayne Kirkwood of ProAudio Design Forum has a couple of examples.
When usually just the opposite since high power " LED" supplies
for outdoor signage.
Are actually rather tough and reliable compared to commercial audio products.
Im not sure the intent as long as you enjoy the process.
Switch mode is more common for musical instrument products
or class D for weight reduction.
Having nothing but problems with them for years now.
Id say no such thing as audio quality. since they just do not belong
in a amplifier.
Again ironically something reliable would actually be a " LED"
supply for outdoor signage.
Even welders use the stupid things now. And just like amplifiers.
I never ever ever had amplifier or welder shut down issues, Until
switch mode appeared = JUNK
Dont forget DC fans in Air conditioners now. Went 2 months no
Cooling. Yep the switch mode died for the fan. Never had a AC
die either, or at least never the Fan power supply. Absolute pure Garbage
for outdoor signage.
Are actually rather tough and reliable compared to commercial audio products.
Im not sure the intent as long as you enjoy the process.
Switch mode is more common for musical instrument products
or class D for weight reduction.
Having nothing but problems with them for years now.
Id say no such thing as audio quality. since they just do not belong
in a amplifier.
Again ironically something reliable would actually be a " LED"
supply for outdoor signage.
Even welders use the stupid things now. And just like amplifiers.
I never ever ever had amplifier or welder shut down issues, Until
switch mode appeared = JUNK
Dont forget DC fans in Air conditioners now. Went 2 months no
Cooling. Yep the switch mode died for the fan. Never had a AC
die either, or at least never the Fan power supply. Absolute pure Garbage
Could it be that manufacturer cheaped out on parts? or mistakes in the design itself?
Yeah, mostly researching SMPS for fun here.
I like the efficiency of SMPS around 90%.
Also weight reduction.
Other than reliability issues - can smps deliver proper voltage and current required for amps at all?
or is it all just not up to the task of good power delivery? and compared to linear psu?
I guess my question is what are particular drawbacks of smps?
Depends who you ask.
Then again in reality.
Home stereo , Live Audio , Car Audio
Home Cooling and Welding.
I never ever had any problems with these
until switch turd appeared.
They shutdown or just break.
In every application.
They are made to be light and cheap.
And a welder supply is no joke far as design.
But at the end of the day, it over heats over many high end brands.
Diy and time involved would be even more costly.
Aside from my negative experiences and response.
It is why I mentioned, as long as you enjoy the process
and their is a actual benefit.
The main one is low cost for mass production.
AKA = Land Fill.... lol
Then again in reality.
Home stereo , Live Audio , Car Audio
Home Cooling and Welding.
I never ever had any problems with these
until switch turd appeared.
They shutdown or just break.
In every application.
They are made to be light and cheap.
And a welder supply is no joke far as design.
But at the end of the day, it over heats over many high end brands.
Diy and time involved would be even more costly.
Aside from my negative experiences and response.
It is why I mentioned, as long as you enjoy the process
and their is a actual benefit.
The main one is low cost for mass production.
AKA = Land Fill.... lol