5V 2A Dual USB Port Wall Power Outlet KI09

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Official specifications:
I got it from banggood

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I got it in a plastic bag.

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The front is clipped can be removed for access to the screws, both for fastening the outlet and for the wires.
If this is removed because something hits it, the outlet gets very dangerous.

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When open it is easy to touch mains parts.

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The usb supply is a circuit board that is just pushed in.

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During my handling of it the frontplate broke, I am not exactly sure how.



Measurements


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It is rated for 2A, but can only deliver 1.6A and that is for both outputs together.

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The converter used works just a fine on 120VAC as on 230VAC.

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I only loaded with 1.5A for the one hour test.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp4005

M1: 47,0C, HS1: 81,4C

Temp4006

HS1: 69,3C

Temp4007

HS1: 49,6C

Temp4008

HS1: 82,7C

Temp4009

M1: 35,5C, M2: 34,5C, HS1: 72,2C


10ohm

At 0.5A the noise is 15mV rms and 150mVpp.

5ohm

At 1A the noise is 21mV rms and 173mVpp.




Tear down

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The circuit board was just puhsed into some slots and could fairly easy be pulled out.

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At the mains input is an inductor, but no fuse. There is a blue safety capacitor.

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The led has one of the pins covered (nice detail).

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The transformer is extended leads for better isolation distance. The area with solder is for cooling.

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On this side there is the bridge rectifier (DB1), the mains switcher (U2: PN8370). There is two rectifier diodes D4 & D5: SS54).

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The wrap around a capacitor is not safety rated, this makes this mounting a bit dubious (A layer of heatshrink would have fixed that).

Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

The wall socket has low noise, has low standby power and can nearly deliver the rated current, the usb connectors can be a bit offset compared to the holes in the frontplate.

I will call it useable, but not with children around (Frontplate is to easy to remove/damage and that gives directly access to mains voltage).



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?