How does the Magsafe achieve 15W fast charging?

The disassemble report for Magsafe

At the press conference, Apple launched a MagSafe magnetic wireless charger that has attracted much attention. This is also Apple's first mass-produced mobile phone wireless charger, marking the official entry of the iPhone into a new era of wireless charging. Promote the development of the wireless charging market.

 The Apple MagSafe magnetic wireless charger, as its name suggests, adopts a magnetic design with a built-in magnet that can actively adsorb and align for wireless charging. This can be achieved while charging and playing, breaking the traditional wireless charging method. The main attraction is that it can wirelessly charge the iPhone 12 series at 15W, and other wireless chargers is only up to 7.5W. So as Apple's first mass-produced wireless charger, it has also made a special design, what is the inside of it? Here We will share with you the detailed disassembly of this product.

1.      Appearance of Apple MagSafe magnetic wireless charger

The packaging box is a typical apple style design, white tone, square shape. The front of the box has Apple logo, MagSafe Charger and product appearance, which is very simple。

There is a hook on the top of the box, which is convenient for product display and sales

Compatible device information is marked on the side sticker, which is compatible with MagSafe for iPhone (with the latest version of iOS).

The product model, input parameters and other information are marked on the sticker on the other side, and the maximum input power is 20W

There are product name, USB-C and usage diagram on the back. The product has passed CE certification.

There is an easy-to-open seal beside the hook for easy opening

Open the box and the wireless charger was protected by the cardboard.

There is a paper slot on the right end of the cardboard for placing the charging board, and the paper is jammed to fix the cable. The entire packaging is completely paper-based, which can be said to be a good embodiment of Apple's environmental protection actions.

TThe Apple MagSafe magnetic wireless charger comes with a USB-C input cable, and the junction of the cable and the charging board is treated with anti-bending. The bottom and edges of the charging board are designed with aluminum alloy shell; the top surface is made of plastic board, the surface is smooth and has a skin-like feel.The measured cable length is about 1 meter, the diameter of the charging board is 55.86mm, thickness is 5.28mm.

2. Disassembly of Apple MagSafe magnetic wireless charger

First, disassemble the USB-C cable, and use a steel sleeve to protect the inside of the shell.

The end of the PCB board is covered with a plastic shell for insulating support, and the front of the board is provided with multiple chips.

Remove the black plastic shell and we can see the wire core is protected by injection molding .

Screen printing 1324V 0X009 9KA。

In the middle is a MOS tube, and the right chip is Cypress CYPD2104, Type-C interface controller.

The big chip comes from TI Texas Instruments.

Blow it down with a hot air gun, we can judge it to be TPS61178 through the package. The boost converter boosts the input to the wireless charging power level. It is speculated that Apple’s 15W wireless charging rises high voltage based on the 7.5W wireless charging. High transmission power, internal charge pump step-down charging.

The Schottky diode next to it comes from ON Semiconductor, NSR20F30NXT5G, which is used to improve conversion efficiency..There is a 3.3μH alloy inductor on the other side for boosting.The components on the USB header circuit board play a boosting role. The end of the input cable has made such a complicated design, which shows that this product is not ordinary.

Disassemble the aluminum alloy shell, the edge magnet ring is composed of multiple small magnets, and glued to fix, placed the wireless charging coil in the middle, and the bonding pad is insulated and reinforced by glue.

A plastic ring is arranged between the coil and the magnet, and a detection coil is attached to the plastic ring.

 The front of the wireless charging board is at a glance. The two shielding covers are the control part and the wireless charging part.

The step-down IC of MPS supplies power to the wireless charging microcontroller.

TI TMP302 temperature detection chip is used to detect the temperature rise of the wireless charging board for overheating protection.

The main control chip of the wireless charger adopts ST ST STM32F446MEY6, high-performance basic series ARM Cortex-M4 MCU with DSP and FPU, with 512 KB Flash, 180 MHz CPU, ART accelerator and dual QSPI.

Four white NPO resonant capacitors are connected in parallel.

Summary of disassembly 

The packaging of Apple MagSafe magnetic wireless charger is all paper-based, which is a good embodiment of Apple's environmental protection actions. The wireless charger comes with a USB-C input cable, the body adopts a disc shape design, an aluminum alloy shell, and the whole is small and exquisite. Magnetic suction and MagSafe wireless charging are its two core points, automatic adsorption alignment and 15W wireless charging, which can be used while charging, allowing users to get a new experience in wireless charging. Apple’s efforts in wireless charging have a huge impact on the entire wireless charging market, and it is worth looking forward to in the future.

 Through disassembly, the charging head network learned that a very complicated boost circuit is designed inside the USB-C cable head alone. The interface controller uses Cypress CYPD2104 and Texas Instruments TPS61178 is used for boosting and increasing transmission power. The wireless charging board is equipped with TI TMP302 for over-temperature protection, and the MPS step-down IC is used to power the STMicroelectronics wireless charging main control chip STM32F446MEY6. The wireless charging controller is also customized to ST. In addition, the workmanship of the product from the cable to the charging board is quite good. The inside of the thread is protected by steel sleeve spot welding. The magnet ring and PCB board inside the charging board are fixed with glue. The PCB board is equipped with a shielding cover.

 The global shipments of iPhone 12 are obvious to all. As the most perfect wireless charger for iPhone 12, its suppliers STMicroelectronics and Texas Instruments will benefit a lot.

 From “chongdiantou”