Ikea Koppla

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Official specifications:
I got it from Ikea

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Measurements


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Ikea%20Koppla%20bottom%20load%20sweep

The top and bottom ports looks nearly the same, the bottom port has higher voltage when loaded.
There is no individual port protection and 4A in a usb port is a bit much.

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Running all port in parallel I found out the common protection trips just above 4A.

The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2693

M1: 40,1C, M2: 40,0C, HS1: 54,1C
The transformer is the hottest part in the charger.

Temp2694

M1: 42,6C, HS1: 53,9C

Temp2695

M1: 33,1C, HS1: 41,7C

Temp2696

M1: 39,2C, M2: 39,6C, HS1: 52,1C

10ohm

The noise level is fairly low 12mV rms and 278mVpp.

5ohm

Increasing current, do increase it slightly: 16mV rms and 309mVpp.

2.5ohm

And again: 22mV rms and 313mVpp.

1.5ohm

At full power the noise level is still reasonable: 30mV rms and 348mVpp.




Tear down

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A good squeeze with a vice and a screwdriver could break it open.

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There is a common mode coil on the input and a inductor between the two capacitors. It uses a mains switcher transistor and has a safety capacitor to the low volt side.
The rectifier diode uses the aluminium behind the usb connectors as heatsink.

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On the bottom side is the input fuse (red part marked F1), a bridge rectifier (BD1), the switcher controller (U1). Notice a part marked NTC2, it is probably a over temperature shutdown.
On the low volt side is the 3 auto coding chips (U2, U3 and U4).

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The black part between the two capacitors is a inductor.

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The low voltage winding on the transformer comes out at the top and goes to the other side of the slit in the circuit board. This is a way to keep good isolation distance.

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Both with a without slit there is a good safety distance.

Testing with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.



Conclusion

It looks like a very clean design, no parts on top of each other or squeezed together, there is space for everything, including a good isolation distance. The performance is good.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger