Lenovo/Fuyuan C-P30
Official specifications:
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Power Source: USB
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Brand Name: Fuyuan
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Model Number: 004
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Type: Travel
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Input: 100-240VAC 50/60Hz
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Output: 5 volt 1500mA
I got it on Aliexpress dealer Fuyuan Technology Digital Mall
I got the charger in a envelope without any accessories
Measurements
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Power consumption when idle is 0.07 watt at 230 volt and 0.03 watt at 120VAC
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Usb output is coded as usb charger (DCP).
The charger is rated for 1.5A and can deliver nearly 1.7A before overload protection activates, this looks good.
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.
M1: 49,4°C, M2: 46,2°C, HS1: 61,7°C
HS1 must be the transformer.
M1: 44,4°C, HS1: 52,9°C
M1: 64,1°C, M2: 48,1°C, HS1: 66,3°C
M1 is the two diodes below the usb connector and HS1 is the diode (D1).
M1: 52,6°C, HS1: 54,0°C
M1: 46,5°C, HS1: 55,4°C
Doing the same at 230VAC looks about the same.
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.
M1: 51,6°C, M2: 48,5°C, HS1: 64,6°C
M1: 65,1°C, HS1: 70,5°C
The diode (D1) is warmer with higher mains voltage, the output diodes are the same temperature.
Nice low noise at 0.5A load: 15mV rms and 150mVpp.
It is also fairly good at 1: 25mV rms and 230mVpp.
Going up to full load decreases the noise slightly: 25mV rms and 180mVpp.
Tear down
A couple of hard squezes with the vice and I could open it.
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.
On the first picture the safety capacitor is very obvious. The secondary output of the transformer comes out on top.
Between the two mains input wires the fuse can be seen. The “resistor” behind the fuse is probably an inductor.
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.
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