Adaptive Intelligent LCD display Multiport Charger WLX-818F

DSC_5960

Official specifications: I got it from gearbest

DSC_5938 DSC_5939

DSC_5940 DSC_5941

DSC_5942

The box has specifications for two models of the charger, but neither matches the charger in the box.

DSC_5958

Inside the box was the charger and a mains cable.

DSC_5961

The charger has lot of outputs: QC, 4xUSB, USB-C (It is not a full PD) and a QI on top.

DSC_7277

The display show voltage and current for each output, except QI. There will be animated markers around the center dot when QI draws power.

DSC_5962

DSC_5963

DSC_5964 DSC_5965



Measurements

Adaptive%20Intelligent%20WLX-818F%20QC5V%20230V%20load%20sweep

The QC rating is way to high, the charger can only deliver about 2.2A

Adaptive%20Intelligent%20WLX-818F%20QC9V%20230V%20load%20sweep

At 9V it can deliver 2.5A, this is more in line with the rating of 2.3A

Adaptive%20Intelligent%20WLX-818F%20QC12V%20230V%20load%20sweep

At 12V it can deliver about 1.5A

Adaptive%20Intelligent%20WLX-818F%20%232%20230V%20load%20sweep

The regular USB outputs are not individually overload protected and can deliver lots of current, but the voltage will drop. This drop is probably due to the current sense resistor for the ammeter.

Adaptive%20Intelligent%20WLX-818F%20%235%20230V%20load%20sweep

Another output looks similar.

Adaptive%20Intelligent%20WLX-818F%20%232345%20230V%20load%20sweep

Running all in parallel and the overload protection shows up, it is at about 8.5A, this is WAY to much for a single USB connector.

Adaptive%20Intelligent%20WLX-818F%20%232345%20120V%20load%20sweep

At 120VAC input the current is slightly lower.

Adaptive%20Intelligent%20WLX-818F%20USB-C%20230V%20load%20sweep

USB-C looks similar to normal USB outputs.

Adaptive%20Intelligent%20WLX-818F%20QI%20230V%20load%20sweep

I could draw about 1A from QI, but I had problems getting it to work.

Adaptive%20Intelligent%20WLX-818F%208A%20230V%20load%20test

My first load test was with a 40W (8A) load distributed on QC and normal USB, it only worked for a bit above 18 minutes.

Adaptive%20Intelligent%20WLX-818F%207A%20230V%20load%20test

I reduced the total load a bit to 7A and it was possible to do a one hour test.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp6825

M1: 73.0C, M2: 60.1C, HS1: 79.2C
HS1 is the QC inductor.

Temp6826

M1: 73.4C, HS1: 83.7C
HS1 is again the QC inductor.

Temp6827

M1: 67.6C, HS1: 77.2C

Temp6828

M1: 51.3C, M2: 41.2C, HS1: 52.2C

Temp6829

M1: 53.6C, HS1: 69.6C

Temp6830

M1: 68.2C, M2: 71.5C, HS1: 71.9C

Temp6831

HS1: 73.5C

10ohm

At 0.5A load the noise increases to 23mV rms and 600mVpp.

5ohm

At 1A load the noise increases to 14mV rms and 582mVpp.

2ohm

At 2.5A load the noise increases to 33mV rms and 670mVpp.

1ohm

At 5A load the noise increases to 21mV rms and 679mVpp, there is some spikes for the peak noise, this is probably due to missing mains filtering.

2ohmQC5V

At QC 5V 2.5A load the noise increases to 146mV rms and 1010mVpp.

10ohmQC9V

At 9V 0.9A load the noise increases to 158mV rms and 1205mVpp.

10ohmQC12V

At 12V 1.2A load the noise increases to 270mV rms and 1789mVpp, the QC output has a lot more peak noise and at very high levels.



Tear down

DSC_7278

There was no screws, but I could break the bottom off.

DSC_7279

There is at least two circuit boards and lots of glue.

DSC_7280

The power supply module has been removed, the QI antenna is behind the gray paper and the QI circuit board is behind the black.

DSC_7281

Everything is out, but I broke the QI antenna while trying to break it loose from the glue.

DSC_7282

The contents of the charger: A power supply module, a USB output module, a QI module and a QI antenna.

DSC_7283

The power supply module looks fairly standard, but old fashioned. At the input is a fuse and four diodes for a bridge rectifier. There is also a common mode coil below the white stuff., the mains switcher is mounted on a heatsink.
There is a safety capacitor between mains and low volt side and on the low volt side the rectifier diode is mounted on the largest heatsink. At the output is a output inductor.

DSC_7285

DSC_7286 DSC_7288

DSC_7287


DSC_7284

On this side is the mains switcher controller (A 6 pin IC marked 6000A / FS008). There is opto feedback from the low volt side with a reference (IC3: 431).

DSC_7289

DSC_7299

Next in line is the USB output circuit with 6 USB connectors and a long display. For QC the small inductor (L1) at the end of the display is used to boost the 5V.

DSC_7304 DSC_7305

DSC_7302
DSC_7303

There is nothing below the display.

DSC_7298

This side of the circuit board is more interesting. Near the power input is the QC boost regulator (U8: Marked YNS223 / 1808), next to a diode (D1: V10P45), next up is the LCD driver (U3: TM1622). Then is the microprocessor (U1: Unmarked) and a multiplexer (U2: HEF4052) to handle all the current inputs. For sensing current there is a resistor for each output (R11, R12, R13, R14, R15, R16, R17: 0.1ohm), this also includes QI. There are two auto coding chips (U4 & U5: Marked A12X), there is also space for one (U6) at the USB-C output, but it is not mounted.


DSC_7300

DSC_7301

DSC_7292

The QI module is a USB powered module, as can be seen on the mounted USB connector. On the module is a OpAmp, a unmarked QI chip and some driver transistors and capacitors for the coil.

DSC_7294

DSC_7295 DSC_7297

DSC_7296

DSC_7293


DSC_7290

DSC_7291

The isolation distance between mains and low volt side is good.


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



Conclusion

This USB charger is thrown together from some standard parts (power supply and a QI module) and the USB output part is probably designed for it and this design has a couple of problems: The QC charger is not very good. All outputs will drop when loaded due to the sense resistor. The voltage display is fake, no actual measurements are done. USB-C is not real PD, but just a 5V USB voltage. A single USB output can deliver 8A, this is way to much.
The efficiency of the power supply is a bit low, this means the charger gets fairly warm when deliver lots of current.


Notes

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