Test/review of 2USB Charger XKY-029

1 post / 0 new
HKJ
HKJ's picture
Offline
Last seen: 1 week 4 days ago
Joined: 05/24/2011 - 12:23
Posts: 7447
Location: Copenhagen, Denmark
Test/review of 2USB Charger XKY-029

2USB Charger XKY-029
DSC_2846
Official specifications:


  • Dual port: 1.5A
  • Input: DC 12V – 24v       What? I did not test this, but I doubt it
  • Output: DC 5V 1.5A
  • Charge two devices at once, including the latest generation Apple devices, while on the road.
  • Works with: iPad mini 1/2, iPhone 5/6/6, iPod ,iPad Air 1/2
  • The USB 2.0 Ports are universal, is 1.5A
  • Bulit-in protect chip, overcurrent protection, overtemperature protection

I got it from ebay dealer smile_cc
DSC_2845
This cheap charger arrived in a plastic bag in a plastic envelope without any accessories.
DSC_2847 DSC_2848
DSC_2849 DSC_2850 DSC_2851
DSC_2852 DSC_2853
Measurements


  • Power consumption when idle is 0.08 watt at both 120VAC and 230VAC
  • Both USB outputs is coded with usb charger (DCP)
  • Both USB outputs are in parallel
  • Weight: 29.6g
  • Size: 64 × 40 × 28mm

2USB%20Charger%20XKY-029%20%231%20120V%20load%20sweep
Specifications says 1.5A (in listing) or 2.1A (On charger), but the charger has trouble delivering 1A on this port.
2USB%20Charger%20XKY-029%20%232%20120V%20load%20sweep
And also on this port.
2USB%20Charger%20XKY-029%20120V%20load%20sweep
Even with both ports together the current is the same.
2USB%20Charger%20XKY-029%20230V%20load%20sweep
At 230VAC it is better at maintaining output voltage, but the 1.1A current is still way below specifications.
2USB%20Charger%20XKY-029%20230V%20load%20test
Running the charger with 1A total output worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
Temp6226
M1: 35.6°C, HS1: 52.4°C
HS1 is the transformer.
Temp6227
HS1: 68.1°C
Here HS1 is the rectifier diode.
Temp6228
M1: 61.5°C, HS1: 63.4°C
On this side it must be the switcher IC.
Temp6229
HS1: 48.1°C
Temp6230
M1: 48.2°C, HS1: 51.0°C
10ohm
At 0.5A the noise is 129mV rms and 1233mVpp.
5ohm
At 1A the noise is 153mV rms and 1931mVpp.
Tear down
DSC_3623
Some pressure on the enclosure with my vice and the bottom popped off.
DSC_3625
This looks to be a very simple charger, there is only a bridge rectifier, a fake safety capacitor (1kV rated) and a rectifier diode.
DSC_3627
DSC_3628 DSC_3630
DSC_3629
DSC_3626
On this side is the main switcher IC (U1: Marked HC2523B).
The USB connectors are not soldered correctly, they will easily break loose.
DSC_3632
DSC_3633
The distance between mains and low volt side is about 3mm over the circuit board, this is way to low.
I wonder why there is a slot in the circuit board, it do not improve safety in any way.
The charger passed the 2830 volt test, but failed the 4242 volt test between mains and low volt side, this makes it unsafe for 230VAC countries.
Conclusion
The charger cannot deliver more than 1A with lot of noise, it is missing a fuse, isolation to mains is way to bad.
Stay away from it.
Notes
The charger was supplied by a reader for review.
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/