Orico Surge Protector with USB charger OSJ-4A5U-EU

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Official specifications:
I got it from Orico

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I got it in a long cardboard box with only the device in it, no manuals or cables.

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There is a switch for each output, but they are not very smooth to use. The black button near the mains cord is the automatic overload fuse.



Measurements



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Good efficiency, but no individual port protection.

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Here at 120VAC

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Running all outputs in parallel I can draw 10A, this matches fine with a 8A rating.

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And the charger can deliver 8A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp4727

M1: 47,4C, HS1: 57,7C
HS1 is probably the transformer.

Temp4728

M1: 46,7C, HS1: 56,0C

Temp4729

M1: 46,3C, HS1: 53,8C

Temp4730

HS1: 56,7C

10ohm

At 0.5A the noise is 1mV rms and 42mVpp.

5ohm

At 1A the noise is 3mV rms and 96mVpp.

2ohm

At 2.5A the noise is 6mV rms and 207mVpp.

2ohm

At 5A the noise is 5mV rms and 156mVpp, all noise measurements are very good.

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There is a automatic fuse for the mains outlets, it is supposed to be 16A and at 20A it trips after a bit over 4 minutes (This is fine).

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At 25A it trips after 14 seconds.
This fuse is an extra safety feature, but I believe that in some installations the main circuit break might trip first.



Tear down

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The bottom used 6 screws (triwing) and a few clips to hold it in place.

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The bottom has a lot of support for the different parts in the mains outlet section.

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The box has 3 sections, the first one is the input with the over current switch and surge protection

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Next section is the 4 mains outlets with switch and indicator led.

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And the last section is the usb power supply.

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The surge suppressor use 3 MOV's each can handle about 120J energy.

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The led board was s bit difficult to get free, it is a diode, a resistor and a led for each output.

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At the mains input is a fuse (F1: 2A), two common mode coils and a bridge rectifier (DB1). The mains switcher transistor is on a heatsink between the big capacitor and the transformer. On the sides of the transformer is the safety capacitor (Y1) and the opto coupler (U2). The synchronous rectifier transistor is on the long heatsink with isolation.
Beside the usb connectors is a inductor to filter output voltage.

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On this side of the circuit board is the fuse and the opto coupler.

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The first image is mostly rectifier heatsink and the output inductor, on the second image is the bridge rectifier, the two common mode coils and the fuse.

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Usb output connectors and a led that is mostly covered in heatshrink.

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All the chips are on this side: mains switcher controller (U1), synchronous rectifier controller (U3), voltage reference (U4) and output auto coding (U5, U6, U7: 2xD1524, 1xUC2635).

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Creepage distance is very good on the circuit board.

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But there is a problem around this slot, the distance is supposed to be 4mm and it is slightly below. A ridge on the bottom that fit into this slot would have fixed it.

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



Conclusion

This is an interesting device with both mains outlets and usb outputs and generally it works very well. The mains output has individual switches with an indicator lamp. The usb supply has lot of power with auto coding and very low noise.
But there are a couple of small details:
The switch for the mains outputs is not that good to use.
The usb outputs lacks individual port protection (This is only an issue if a damaged usb cable is connected).



Notes

The usb charger and power strip was supplied by Orico for a review.

Read more about how I test USB power supplies/charger