The emergence of wireless charging technology has a milestone significance for power supplies. However, for wireless charging, many people are still in a stage of knowing and understanding. In order to let everyone know more clearly what wireless charging is, this article will introduce the popular products on the market and their detailed disassembly process.

Palm touchstone dismantling

Touchstone is the world's first wireless charging product, because the principle and manufacturing process are not complicated, and similar products have appeared in foreign countries. I believe that the country will have the same cottage products soon. Of course, if any accessory manufacturer is willing to take a little more time to do it seriously, such as giving each mobile phone a special set of back cover and base, it should be a very profitable business, the gospel of the majority of mobile phone users.

This machine has a gap with the iPhone in terms of maturity of workmanship software, but the Palm Pre has one thing that is better than the iPhone-- wireless sensor charger. At the CES2009 conference at the beginning of the year, it was the most sensational accessory, and the limelight was even flush with the Palm Pre console. To sum up in one sentence of the Palm spokesperson: TouchStone not only requires the Pre to be very convenient to charge, but also the Pre is very sexy charging.

Today, Xiaobian takes you apart to unfold this magical charger and uncover the secret behind inductive charging.

The thickness, from the inside of it, turn the back cover over, we see two contacts here, and the circular plastic ring is an electromagnetic induction ring.

   Inductive charging back cover disassembly

The black sticker on the back is torn off, and the answer to the Touchstone wireless charging is also unveiled.

Pay attention to the four silver metal screws on the back cover, which correspond to the four magnets on the base, so that the Palm Pre can be firmly attached to the charging base.

After contact with the base, the battery is charged by magnetic generation, and then the battery is charged through the two positive and negative contacts. The principle is very simple, you can really get it before you can.

Of course, there is a control circuit here, otherwise it is very dangerous to not stop after the battery is full.

The true appearance of the Touchstone wireless charging base is very simple, and a large palm LOGO is the only decoration. Since the Palm Pro machine, palm designers like this LOGO very much, much higher than the previous tro 650/680.

The surface of the base is made of soft rubber, and the machine will not slide on this slope. Plus the four magnetic adsorption points that have just been said, the Palm Pre can stay on the base honestly. In addition, the power cord interface of the base is microUSB like the Palm Pre.

Power is transmitted to this small cylinder through this wire and becomes magnetic, and then becomes electrically charged with the back cover.

The bottom of the base, sponge material, very slippery, it is easier to get dust, but it does not matter, it is the bottom

Unpacking the base of Touchstone, all the previous worship of wireless inductive charging became a surprise - it was as simple as that! Also why is high technology?

The essence of the magnetic phenomenon is current, and the Oersted experiment many years ago proved the magnetic effect of the current. This small piece of circuit plays a controlling role, stabilizing the 5V voltage at the input end, the base is electrically generated by electricity, and the back cover is magnetized, which is the whole process of wireless inductive charging.

The so-called high-tech products are sometimes like Liu Qian's magic, which looks amazing, but it is surprisingly simple after the demolition.

There have been media reports in foreign countries, Touchstone this wireless charger costs only 5 US dollars, about 30 yuan, but the selling price is actually 70 US dollars, nearly 500 yuan. The principle we all understand is nothing more than Maxwell's electromagnetic theory that I learned in junior high school, but it is indeed the palm's ability to turn the principle into a real thing. Electric small two wireless charger dismantling

The electric small wireless charger we chose does not have any screw holes when viewed from the outside, so how to disassemble it? We must first prepare the screwdriver for the tearing of the machine and the screwdriver. With these two tools, you can start disassembling.

Disassemble the wireless charger

The disassembly must first be started from the USB interface of the wireless charging pad. Gently pry the area apart and use a rounded screwdriver to slide along the edge. At this time, it may feel very tight. There is a feeling of smashing the charger. At this time, the hand is steady, and after sliding a lap, the wireless charging pad can be opened.

This USB interface is the starting point for disassembly

The wireless charger is turned on

Opening the charging board, we saw that the original two parts were connected by the snap rive in the charger. Turn on the charger, and start exploring the mysteries below.

Explore the mystery inside the wireless charger

We have turned on the wireless charger, although the charger is large, but the main components are very simple. It mainly consists of two parts: the control circuit board and the charging coil.

The charging circuit board is the core part of the wireless charger. We saw that the wireless charger of the electric small two uses the wireless charging solution of AFD-101TQ, and the wireless charging control chip is AFD-101TX. We saw that the entire circuit board is still very well-made. The solder joints and particles on the board are very flat, which makes the work satisfactory.

   AFD-101TQ wireless charging motherboard

   AFD101-TX wireless charging control chip

   IR chip on the motherboard

   Control panel back

   Wireless charger capacitor

Secret in the receiver

The electric small two W9300 is designed for the Samsung GALAXY S3, and there is a wireless receiver in addition to the wireless charging board. Put it on your phone, then you don't need to buy an expensive official wireless charging kit to wirelessly charge your phone. So what is the secret inside this receiver? Here is the secret for everyone.

We can tear off the sticker on the front of the receiver and you can see the inside of the wireless receiver. At the receiver we can see the QI logo and the line part of the wireless charging solution.

On the back of the receiver, we saw a wireless charging coil reinforcement sticker that allows the phone to get more full charge when charging wirelessly.

   Receiver back

  Reinforced coil on the back

Our dismantling has come to an end here. We put the wireless charger back, recharge the phone and found that everything is working fine.

   Wireless charging for the Nexus 4

Nexus4 wireless charging module disassembly

The Nexus 4 comes with a wireless charging function that complies with the Qi standard. The phone is disassembled below to see its true face.

The Nexus 4 back cover cannot be removed at will. After removing the T5 Torx screws, we can use the plastic opening tool to remove the back cover of the Nexus 4. When you remove the back cover, you must use a professional mobile phone to stick, otherwise it is difficult to open the device or cause damage to the device.

The module attached to the back cover is the NFC antenna and wireless charging coil. The surface of the coil is covered with a thin gray magnetic shield.

   Remove this coil module

The outer four-turn line is an NFC antenna, and the inner coil is a wireless charging receiving coil. Connect to the metal bullet points on the phone's main board through two metal contacts. The wireless charging module is attached to the inside of the back cover.

The NFC antenna on the back cover of the Nexus 4 and the metal pins of the wireless charging sensor are connected to the phone's main board through the closure of the back cover.

Powermat wireless charging system

The most inseparable thing about electronic devices is the problem of charging. For example, a Powermat input device requires a user to place their handheld device on a charging pad and miraculously charge the battery without wires. Of course, the program also needs to join the universal receiver to protect the phone.

Want to know what the inside of Powermat looks like? Let us now dismantle the Powermat 2X. You can see that it is a fairly spacious board. As long as the speaker "beep" sounds, you can guess that Powermat 2X is working. But what exactly makes it so magical for wireless charging?

Dive into the interior of Powermat 2X

The device uses a technology called inductive power conversion. This principle was first discovered by Faraday and Ampere, but it has only really been applied to the actual system until now. At its root, it consists mainly of two parts, the primary and secondary parts. In the primary part, a high frequency sinusoidal current is supplied from the resonant power coil power supply in the coil, and a secondary (obtained) smaller coil has an AC-DC converter to be converted into a DC power supply. In the Powermat, the primary coil is wound 16 times and the receiver is 8 turns. A magnetic core is placed in the coil and then placed on both sides of the PCB circuit board.

Today, small and safe magnetic fields are applied to handheld devices.

Now let's take a look inside of Powermat for its key design details:

Texas Instruments' TLC555C clock generator - the chip was first produced in 1971.

Core source system MP8040DN power switch. This is a half-bridge coil dedicated power driver.

MKA4 from Freescale has a different mystery. It consists of two packages with similar molds attached together. We think it might have a magnetic (or capacitively coupled) isolator to separate the control signal from the sinusoidal charging current or as a current sensor.


   Powermat inductor

Charging receiver interior

We are choosing an independent receiver instead of a custom mobile phone. It is very difficult for users to add things in. This is commonplace for the internal dismantling.

   Texas Instruments TL431AIDBZ regulator provides accurate output voltage Nokia Lumia 920 wireless charging base DT-900 disassembly

The Lumia 920 and Lumia 820 can be used with a wide range of third-party wireless charging docks. Nokia said that the adoption of wireless charging technology and charging dock will make the charging of these two phones more convenient. Nokia's utilization of the charging area on the entire charging base reached 80%, which means that you only need to put the phone on the base without worrying about whether it is "docked up".

Recently, the domestic Novo Bar released a set of wireless charging coils, we will take a closer look.

The DT-900 input is a 12V/750mA adapter with a three-coil wireless charging solution inside. Therefore, the mobile phone can be charged regardless of whether it is placed in the middle or both sides of the charging stand.

   Detailed disassembly diagram:

By the way, the disassembly map of the Nokia Lumia 920 phone is also posted, and look at the wireless charging receiver. The receiving end coil and the electronic board are attached to the inside of the back cover.

   Nokia Lumia 920 teardown

   Nokia Lumia 920 large charging coil

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