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About china LLC smps
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Old 10th January 2019, 07:07 PM   #11
umut1001 is online now umut1001  Europe
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Hi.I connected it to 500w class d amp and 13 inch subwoofer.I already can not open max sound at home because it shakes glasses so i can say it is powerful enough but it would be better seller sends item with Rubycon output capacitors as same as his item picture(received amp with china made output caps) May be average performance for money.( i am using it for subwoofer,maybe i do not use for stereo and try linear PS for stereo system)
I did not use it much.I am listening music with my HD6xx and hi end dac with headphone amp.
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Old 10th January 2019, 07:23 PM   #12
hansueli is offline hansueli  Switzerland
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Thanks for your reply. Nice to hear its enough powerful.

Everyday listening?

Can you say what kind of chip is used for controlling?
It's a black piece with approximately 16 pads.

Thanks so much.

I will order same supply.
Output capacitor can be changed =)
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Old 18th January 2019, 11:24 AM   #13
hansueli is offline hansueli  Switzerland
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I receive my PSU today


Its an L6599A chip.


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Supply works. I will make some tests but unfortunately my EL-load broken after I plug the supply.... I have to take a look whats wrong.


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Old 25th January 2019, 02:59 PM   #14
heinrichh is offline heinrichh  Germany
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Hansueli,


I bought the same supply recently and I'm looking forward to your measurements. Waht I'm in is not only the ripple on main output but also the quality of the +/- 15V rails and the EMI on the input side. For the transformer a shielding would be necessary, that's clear from the previous posts.


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Old 27th January 2019, 02:34 PM   #15
hansueli is offline hansueli  Switzerland
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I just broke my supply. Short-circuit on aux-voltage.... supply totaly dead. New fuse brings nothing. Transformer makes arc and smoke. FI goes down.... I need to buy a new :-(
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Old 27th January 2019, 02:37 PM   #16
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by hansueli View Post
I just broke my supply. Short-circuit on aux-voltage.... supply totaly dead. New fuse brings nothing. Transformer makes arc and smoke. FI goes down.... I need to buy a new :-(
This is one downside of SMPS.
A transformer, bridge and smoothing is more hardy.

I have transformer test rig which gets shorted quite often and has lasted me 10 years so far !
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Old 27th January 2019, 02:40 PM   #17
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by Eva View Post
This is not an accurate statement. The radiated EMI from the transformer (magnetic field) comes from voltage drop across leakage inductance. In conventional push-pull, forward or flyback SMPS leakage inductance must be as low as possible. In LLC SMPS leakage inductance is higher and is used as a ballast, there is the option to include leakage inductance in the transformer or to use an external inductor. The 1st option is adequate for small power adapters, but radiated EMI is higher. The 2nd option is adequate for audio SMPS.
The LLC SMPS voltage in the inductor is a sine wave.
So there are no square edges to radiate at very high frequencies.
It is much better than flyback topolgy.
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Old 27th January 2019, 10:10 PM   #18
umut1001 is online now umut1001  Europe
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Hi Hansueli.I put this smps and L15DX2 500w class d amp in this case(I am using it bridged).It plays well since 2 days.But there is a small sound (tırrrrrrr) from smps transformer.(not audible over 30cm)
It plays well now.For your information.I did not open a ventilation hole on top and bottom because it is not heating up.
I hope it will not break down.
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Last edited by umut1001; 27th January 2019 at 10:24 PM.
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Old 12th February 2019, 05:35 PM   #19
heinrichh is offline heinrichh  Germany
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Hansueli,
with a bit reengineering I found out that the auxiliary supply has its own winding on the transformer and is completely separated from the rest, even the center tap. There are only two diodes and two small electrolytes, that's it. Shorting it will kill the transformer because the power of the auxiliary winding is too small for triggering the protection ciruit if there is any.

Do you still have the SMPS? I have tried to figure out how much power can be taken from the auxiliary winding, but the manufacturer can not be determined even with lots of hours googling and the various dealers know nothing about. We could at least estimate that if we could measure the wire diameter of the winding. For this I would have to destroy my power supply, but yours is already broken. Can you measure it for me?


TIA Heinrich
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Old 13th February 2019, 12:08 PM   #20
hansueli is offline hansueli  Switzerland
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Dear heinrichh


Sorry but I have no possibility to measure the wiring diameter.

The wire are already at the recycling :-(

When I take the wire away from the transformer the wires were connected to the high voltage side. So for me it’s not really galvanic separation. It could be used for powering the L6599



Last edited by hansueli; 13th February 2019 at 12:11 PM.
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