Test/review of UK Charger 5V 2A JHD-AP012B-05200AB

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HKJ
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Test/review of UK Charger 5V 2A JHD-AP012B-05200AB

UK Charger 5V 2A JHD-AP012B-05200AB
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Official specifications:


  • Input voltage: 100-240V 50/60Hz
  • Output: 5V 2000mA

I got it from Ebay
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Measurements


  • Power consumption when idle is 0.15 watt
  • USB outputs is coded as USB charger (DCP)
  • There is a green led in the top.
  • Weight: 51.4g
  • Size: 58.6 × 51.4 × 49.1mm

UK%20Charger%205V%202A%20JHD-AP012B-05200AB%20230V%20load%20sweep
The charger can deliver about 2.9A before overload protection kicks in.
UK%20Charger%205V%202A%20JHD-AP012B-05200AB%20120V%20load%20sweep
This drops to about 2.8A at 120VAC
UK%20Charger%205V%202A%20JHD-AP012B-05200AB%20230V%20load%20test
The charger can deliver 2A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
Temp7117
M1: 50.3°C, HS1: 56.0°C
Temp7118
M1: 63.9°C, HS1: 69.9°C
HS1 is the rectifier diode.
Temp7119
HS1: 61.1°C
Again HS1 is the rectifier diode.
Temp7120
M1: 52.3°C, HS1: 56.5°C
Temp7121
HS1: 74.8°C
HS1 is the transformer.
10ohm
At 0.5A the noise is 5mV rms and 106mVpp.
5ohm
At 1A the noise is 7mV rms and 145mVpp.
2ohm
At 2.5A the noise is 7mV rms and 97mVpp, this is very low noise.
Tear down
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It was a bit hard to break apart, but some screwdrivers uses as prybars worked.
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A very compact design, it must be expensive to mount all the parts.
At the mains input is a fuse in shrink wrap and a MOV to handle mains transients. The bridge rectifier is four diodes (D1..D4). There is two smoothing capacitors (C1 & C2) with a inductor between. The mains switcher transistor (Q1) is next to the safety capacitor (CY1).
On the low volt side is a large rectifier diode (D7) and two smoothing capacitors (C5 & C?) with a inductor between.
There is a opto feedback.
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The bottom of the circuit board do also have a lot of parts, mostly passive, but there is the switcher IC (U1) and on the low volt side the reference (U3: 431). There is space for a auto coding chip (U4), but it is not mounted.
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Across a slot there must be 4 mm between mains a low volt side, there is a lot more space here. Directly across circuit board there must be above 6mm, but here it is slightly below 6mm!
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
The charger is a bit old fashioned in the design, but it works nicely with enough current and low noise. Safety is not perfect, but the problem is minimal.
Notes
The USB 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/