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Home › Reviews › Chargers & Cables › ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review
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ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review

Floyd
August 2, 2019

ZMI, one of the Xiaomi ecosystem brands, launched a car mount wireless charger on August 1st. Main selling points include 20W fast wireless charging for phones like the Xiaomi 9, easy-to-operate zinc alloy arms, as well as intuitive operation. Let's dive into the teardown.


I Unboxing

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

It comes with ZMI's minimalistic white box.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Main features: 20W max fast wireless charging, alloy arms, and intuitive operation.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Specifications ont he back.

Model: WCJ10

Input: 5V2A, 9V1.6A, 12V1.6A, 15V1.6A, 20V1.35A

Output: 20W MAX

Operating Temperature: 0℃-35℃

Diemensions: 122*91.59*87.2mm

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Package contents: car mount wireless charger, car charger, clip, base with a sticker, Micro-USB cable, and user manual.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Specifications of the included car charger:

Input: 12-24V4A.

Output: 5V2A (USB1); 5V3A, 9V2A, 12V2A, 15V1.8A, 20V1.35A (USB2).

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The car mount wireless charger should be connected to the red USB port to enable fast wireless charging.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The USB port 1 has normal charging speed while the red USB port 2 supports fast charging.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The base with a sticker at the bottom.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The clip.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Rear view of the car mount wireless charger. Ventilations along the edges.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

On the front, a lightning bolt logo indicates the wireless charging area.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Two stands on the bottom to hold the phone.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Alloy arms in dark grey color.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Pity the input port is Micro USB instead of USB-C.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Silicone pads inside of the clamp arms ensure firm grip of the phone.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Close-up of the hinge of the alloy arm. 

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Close-up of the silicone pads inside of the clamp arms.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The car mount wireless charger can be mounted to the air vent using the provided clip, or mounted to the base with a sticker at the bottom.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Top view.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Side view.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The ZMI 20W car mount wireless charger not only supports Xiaomi 20W fast wireless charging, but also support Apple 7.5W, Samsung 10W wireless charging, offering superb wireless charging compatibility.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

It starts charging instantly when we put the phone inside.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

There is an LED indicator at the bottom near the input port.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The arms grip the phone very firmly.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Big phones like the iPhone XS Max can also be perfectly fitted inside.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Our Samsung S10+ shows that it supports Samsung 10W wireless charging.


II Teardown

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Pry open the front cover.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The middle frame is exposed with a few screws, and the main components of the wireless charging are hidden inside.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Remove the screws and remove the back cover to reveal the main parts of the product.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Main parts of the product.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Close-up of the mechanical structure with gears and spring. One end of the upper and lower springs hooks the base and the other end hooks the clamp arm.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Remove the two arms which have a serrated and spring structure. Springs are used to control the alloy clamp arms to match various widths of the mobile phones, and the serrated structure allows the product to expand.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Zinc alloy metal parts and PCBA circuit boards.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Remove the middle frame to reveal the wireless charging coil.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

There are two light guides on the top of the plastic middle frame.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

PCBA and wireless charging coil.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

The wireless charging coil and the magnetic spacer are fixed on the zinc alloy metal plate for structural rigidity and heat dissipation.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

A temperature probe is attached to the center of the coil with tapes.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

There is a black shading foam between the two LED indicators.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

CBB capacitor, 0.25μF.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Wireless charging controller chip with letter code MI9500, Xiaomi custom chip based on NuVolta architecture.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Another custom chip from Xiaomi with letter code MI9000, an integrated power stage for wireless charging with built-in driver and power tube. It is also based on NuVolta architecture.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

Passive crystal oscillator that clocks the wireless charging controller.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

MOS tube with letter code 3401.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

MLCC capacitors.

ZMI 20W Car Mount Wireless Charger (WCJ10) Teardown Review-Chargerlab

All the components.


III Conclusion


The ZMI 20W car mount wireless charger not only supports Xiaomi 20W fast wireless charging, but also support Apple 7.5W, Samsung 10W wireless charging with great wireless charging compatibility. Its clever and robust alloy arms offer intuitive operation. And its minimalistic design fits perfectly into almost every car interial. However the use of Micro USB instead of USB-C is a let down.

Like many of ZMI's power banks, the 20W car mount wireless charger utilizes Xiaomi's custom chips for performance, efficiency, and lower costs, which further shows the talent of its engineering team.


Pros:

20W max wireless charging.

Minimalistic design.

Easy operation.


Cons:

Micro USB input port.


Source: chongdiantou

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