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PC Power Supply Discussion Troubleshooting and discussion of computer power supplies

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  #11  
Old 01-04-2018
Stefan Payne Stefan Payne is offline
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Built to Last: Ten-Year comprehensive CORSAIR warranty.
Just 10 years??

I was expecting corsair to get to the next level in the "Warranty Wars" and offer at least 10, if not 20 years warranty...
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  #12  
Old 01-04-2018
TELVM TELVM is offline
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For those intrigued by this newcoming "totem-pole" stuff:

http://www.gansystems.com/_includes/...0rev170411.pdf

http://www.ti.com/lit/an/slyt718/slyt718.pdf
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  #13  
Old 01-04-2018
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Originally Posted by TELVM View Post
Nice reading, thanks.
Is there a conventional bridge rectifier for +5VSB in the AX1600i?
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  #14  
Old 01-04-2018
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Very nice. A PSU with highest-end technology is definitley a good thing. The GaN mosfets are used from long time ago in military ASEA radar technology and EW warfare, and are the most efficient among the any kind of MOSFETS like is shown here, and seems to be cheap to produce nowdays.

But there is one thing I cannot understand. Why those PSU's with MCU and GaN technology doesn't have >96% and even more than 98% eff. when the level of 94% is achieved with analog technology on the best platform like are the Primes.
Here is the chart from Cybenetics with Corsair efficiency chart and here the Seasonic's chart and the difference between the AX1600i and the SS-600TL (fanless) are at maximum of 0.252%!! wich is not a great number IMO. Because according to various manufacturers of GaN MOSFETS the efficiency would be more than 98% using that technology instead of using "conventional" MOSFETS, and using a totem-pole APFC.
According to NXP Semi the efficiency with a totem pole bridgeless APFC will be 98%. What is the real efficiency number of a normal APFC since there are PSU's wich can achieve the same astronomical numbers with "conventional" technology?
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  #15  
Old 01-04-2018
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98% efficiency represents the efficiency of just the PFC circuit. Still so much more circuitry beyond that for their to be losses.
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  #16  
Old 01-04-2018
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^^Indeed.
And I also commonly see the misconception that PFC somehow increases efficiency, it does not.
In fact if you remove it you will increase efficiency.
The only loss would be in VA, but consumers are billed in Watts, not Volt Amperes
(And efficiency is measured in Watts, not VA).
Oh, and such a PSU could only be sold in the US, since EU has a PF requirement of at least 0.75 which such a PSU would fail.
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  #17  
Old 01-04-2018
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If the secondary of the digital unit would have the same loses as the secondary of an analogic PSU's and the APFC of the analogic is inferior than totem-pole ones is not possible to have the same overall efficiency.

With 94% efficiency overall at both types of PSU's IMO there are two logical posibilities. Wich one is true?
1. The APFC in the analogic PSU are at the same level of efficiency with the totem-poles ones.
2. The secondary of a MCU unit had more losses than an analogic controlled one.
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  #18  
Old 01-04-2018
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Neither.
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  #19  
Old 01-04-2018
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Where is that Cybenetics report ? :O
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  #20  
Old 01-04-2018
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Neither.
With higher secondary and APFC efficiency it would be at the same overall like one with lower primary and secondary efficiency? How is this possible?
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