Belkin Micro Home Charger

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Official specifications:

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I got it in a cardboard box, it is supposed to contain the charger and a Apple charge cable.

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Measurements


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The charger can deliver a bit over 1.2A, this is fine for a 1A charge.

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It also works on 120VAC.

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No problems running one hour at 1A.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp3409

M1: 41,1C, HS1: 62,0C

Temp3410

M1: 55,0C, M2: 40,7C, HS1: 60,0C

Temp3411

HS1: 47,8C

Temp3412

M1: 48,0C, M2: 40,0C, HS1: 61,6C

10ohm

At 0.5A the noise is 10mV rms and 204mVpp.

5ohm

At 1A the noise is 12mV rms and 268mVpp.




Tear down

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My vice and a mallet could open it.

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There is a fusible resistor in series with the connection, looks like it was an afterthought.
It has two capacitors (C1 & C2) on the mains input with a inductor (L1) between, there is a mains switcher transistor (Q1)..
On the low volt side there is a rectifier diode and two capacitors with an inductor between.


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On the first image the output inductor can be seen, on the second image the input inductor can be seen. There is also a bit of the fusible resistor visible.

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There is some isolation paper on the this side to prevent the mains input connection touching the circuit board.

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On this side is a bridge rectifier, the mains switcher IC and coding of the usb connector.

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Safety distance looks good.

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



Conclusion

Charger works fine with fairly low noise and is safe, but the coding is a bit old and 1A is fairly low current by todays standard.


Notes

Charger was supplied by Pro backup (probackup.nl)

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