E-Strong ES-10 Dual usb charger

DSC_1110

I bought this charger with the above name, but as can be seen on the photos it also has another name, the type number (ES-10) is the same.

Official specifications: I got it from a Gearbest

DSC_1102

It was in a plastic bag and shipped in a envelope. There was no manual or usb cables included.

DSC_1111

DSC_1113 DSC_1115 DSC_1116

DSC_1112 DSC_1114




Measurements

E-Strong%20ES-10%20Dual%20usb%20charger%201A%20230V%20load%20sweep

The 1A output can deliver 3.3A, it is a bit high.

E-Strong%20ES-10%20Dual%20usb%20charger%202.4A%20230V%20load%20sweep

The 2.4A output can deliver the same.

E-Strong%20ES-10%20Dual%20usb%20charger%20230V%20load%20sweep

And both outputs in parallel is also the same.

E-Strong%20ES-10%20Dual%20usb%20charger%20120V%20load%20sweep

At 120VAC the output current is slightly lower.

E-Strong%20ES-10%20Dual%20usb%20charger%20230V%20load%20test

No problems running one hour at 5V 2.4A.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp4764

M1: 53,7C, HS1: 68,9C
HS1 is the transformer.

Temp4765

M1: 55,0C, HS1: 57,9C

Temp4766

M1: 54,2C, HS1: 56,6C
The aliminum wrap equalize the temperature over the surface.

Temp4767

HS1: 54,5C

Temp4768

M1: 54,1C, HS1: 60,0C
One of the usb connectors are hotter than the other, the hot one is very likely due to heat from the rectifier diode.

10ohm

At 0.5A the noise is 85mV rms and 538mVpp

5ohm

At 1A the noise is 125mV rms and 710mVpp

2ohm

At 2.5A the noise is 161mV rms and 714mVpp, the noise is on the high side.




Tear down

DSC_3938

Pressing the lid a bit with my vice made it pop open. The black cover is a aluminium piece.

DSC_3939

On this side is a fuse at the mains input, a mains switcher IC, a optocoupler.

DSC_3944

DSC_3945 DSC_3947

DSC_3946

DSC_3940

On this side is a bridge rectifier and the rectifier diode (SB1045L). There is a led between the usb connectors and a reference (431) for the optocoupler.

DSC_3941

DSC_3942 DSC_3943

There is a lot wrong with this charger, here is two details:
The CY2 capacitor is not a safety capacitor and it do not have 6mm between its two connections. This capacitor makes the charger into a death trap.
Under the opto coupler the distance between mains and low volt side is also supposed to be 6mm, it is maybe 1.5mm.

The charger failed a test with 2830 volt this makes it unsafe everywhere.



Conclusion

The only thing to say about this charger is: Stay away


Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?