Lenovo/Fuyuan C-P30

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Official specifications:
I got it on Aliexpress dealer Fuyuan Technology Digital Mall

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I got the charger in a envelope without any accessories

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Measurements


Lenovo%20C-P30%20120VAC%20load%20sweep

The charger is rated for 1.5A and can deliver nearly 1.7A before overload protection activates, this looks good.

Lenovo%20C-P30%20120VAC%20load%20test

There is no problem running at full 1.5A load for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2648

M1: 49,4C, M2: 46,2C, HS1: 61,7C
HS1 must be the transformer.

Temp2649

M1: 44,4C, HS1: 52,9C

Temp2650

M1: 64,1C, M2: 48,1C, HS1: 66,3C
M1 is the two diodes below the usb connector and HS1 is the diode (D1).

Temp2651

M1: 52,6C, HS1: 54,0C

Temp2652

M1: 46,5C, HS1: 55,4C

Lenovo%20C-P30%20230VAC%20load%20sweep

Doing the same at 230VAC looks about the same.

Lenovo%20C-P30%20230VAC%20load%20test

The one hour test also works fine at 230VAC.

The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2643

M1: 51,6C, M2: 48,5C, HS1: 64,6C

Temp2645

M1: 65,1C, HS1: 70,5C
The diode (D1) is warmer with higher mains voltage, the output diodes are the same temperature.

10ohm

Nice low noise at 0.5A load: 15mV rms and 150mVpp.

5ohm

It is also fairly good at 1: 25mV rms and 230mVpp.

3ohm

Going up to full load decreases the noise slightly: 25mV rms and 180mVpp.



Tear down

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A couple of hard squezes with the vice and I could open it.

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On the top side of the circuit board the fuse can be seen where the mains is connected, there is a mains switcher transistor against the transformer and a safety capacitor beside the transformer.
Notice the black shield between the transformer and the usb connector.

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On the first picture the safety capacitor is very obvious. The secondary output of the transformer comes out on top.

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Between the two mains input wires the fuse can be seen. The "resistor" behind the fuse is probably an inductor.

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On this side of the circuit board there is a bridge rectifier (DB1), a switcher controller IC (IC) and two rectifier diodes (Below the USB connector).
The black shield is a piece of (special) paper to improve the isolation, especially from the usb connector to the transformer.

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The isolation distances looks fine, 4mm with slot and 6.4mm without slot and the slot do have the black shield making the isolation much better.


Testing with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.




Conclusion

This charger may be a OEM for Lenova, both the performance, the safety and the construction looks good enough for it.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger