Test/review of Proelio Universal USB Charger XKY-024

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HKJ
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Test/review of Proelio Universal USB Charger XKY-024

Proelio Universal USB Charger XKY-024
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Official specifications:


  • Brand Name: Proelio
  • Model Number: Universal USB Charger
  • Support Quick Charge Technology: No
  • USB Ports: 2
  • Quality Certification: CE,RoHS,PCT,CCC
  • Output Interface: USB
  • Input: 100-240V/0.6A
  • Output: 5V/2.1A
  • Power Source: A.C. Source,USB
  • Colors: White

I got it from aliexpress dealer POP Finger Holder Store
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It was packed in a plastic bag inside the usual envelope.
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There is a led behind the front of the charger.
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Measurements


  • Power consumption when idle is 0.12 watt
  • Both USB output is as usb charger (DCP)
  • The two outputs are in parallel.
  • Weight: 37g
  • Size: 86 × 36.5 × 36.5mm

Proelio%20Universal%20USB%20Charger%20XKY-024%20%231%20230V%20load%20sweep
Output can deliver about 2.3A before it drops.
Proelio%20Universal%20USB%20Charger%20XKY-024%20%232%20230V%20load%20sweep
It is the same for the other output.
Proelio%20Universal%20USB%20Charger%20XKY-024%20230V%20load%20sweep
And also when using both outputs.
Proelio%20Universal%20USB%20Charger%20XKY-024%20120V%20load%20sweep
But not at 120VAC, there it can only deliver 1.7A
Proelio%20Universal%20USB%20Charger%20XKY-024%20230V%20load%20test
Running 1 hour at 1.7A worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
Temp5891
M1: 59.9°C, M2: 52.9°C, HS1: 60.3°C
HS1 is the transformer.
Temp5892
M1: 63.3°C, HS1: 65.7°C
Temp5893
HS1: 51.1°C
Temp5894
HS1: 97.9°C
HS1 is the transformer.
Temp5895
HS1: 75.3°C
HS1 is the rectifier diode.
10ohm
At 0.5A the noise is 146mV rms and 1094mVpp.
5ohm
At 1A the noise is 252mV rms and 1297mVpp.
Tear down
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Placing the charger in my vice and whacking one with my mallet did open it.
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At the mains input is a glass fuse and a brudge rectifier, the switcher (RM6204) is on this side, together with the opto-coupler. There is a large rectifier diode near the usb connector. The “blue safety capacitor” is not a safety capacitor, but just a 1000V capacitor
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On this side is the usual reference (Q1: 431).
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The creepage distance is about 1.5mm, this is way to short.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
The high voltage test did not show safety problems, but there are due to too short distance and a unsafe capacitor. Performance varies with voltage and there is a lot of noise in the output.
Stay away from this charger.
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?

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/