QI wireless charging power bank: key versions with basic functions in the wireless world

All manipulations with transferring files using a smartphone take place in the «on-the-air» mode. The world is becoming mobile and wireless. In 2008, the Wireless Power Consortium (WPC) was founded. It united manufacturers from Europe, Asia, and America with a common goal – to develop and place on the IT market a unified standard for QI wireless charging power bank. In 2009, Palm, Inc. – an American manufacturer of pocket personal computers and smartphones accommodated in Sunnyvale, introduced the first wireless charging phone.

In September 2012, Nokia rendered 2 smartphones to the market: Lumia 820 and Lumia 920, with the support for the qi standard. Large manufacturers of smartphones – Samsung, Google Nexus (Asus, LG), Sony, etc pulled themselves up. Since 2017-8, other market players such as Samsung, Apple, Huawei began to equip their smartphones with Qi wireless charging functions to enable an external power bank usage as more advanced  technology.

The principle of operation of the Qi standard is electromagnetic induction. Technically, this is a wireless charging induction coil that creates an electromagnetic field when AC is present. And a compatible receiver – a Qi-enabled smartphone with a built-in receiver coil. A coil that catches this field converts the received energy into direct current. This energy is then transferred to the battery. The Qi standard provides two options: low power – from 0 to 5 watts and medium power – up to 10 watts. Qi 1.2 standard  for QI wireless charging power bank includes the detection of unknown objects in the field of action of the charger. The charging is only possible with Qi-compatible devices.


to enable wireless charging of its devices, Nokia offers two accessories – Nokia Wireless Charging Plate (DT-900) and  Nokia Wireless Charging Pillow by Fatboy (DT-901).The body of the DT-900 stand is made of plastic in a bright red color. Its dimensions are relatively small – about 120 × 60 × 11 mm. The upper matte surface has the manufacturer’s logo in the center. There is a low rubber rim around the stand. 

It allows the user to hold the smartphone on the charger. The large panel dimensions are roughly equivalent to a 4.5 ″ smartphone – large devices will cover it completely. The edge and bottom surface are glossy. On one of the short rounded ends, there is a power supply input. And on the opposite side, there is a white indicator of charging operation. At the bottom of the panel, there is a rubber insert that prevents smartphone from slipping during power bank QI wireless charging time. The supplied cable is red, but the power supply is white. The parameters of this unit: 12 V 0.75 A, — significantly more than standard wired chargers give out. The list of compatible devices: Lumia 720 models and above. But only Lumia 920 has a built-in receiver.

Nokia Wireless Charging Pillow by Fatboy (DT-901) is a soft and flexible pillow. The rest of the characteristics are the same: support for the Qi standard, an external 12 V 0.74 A power supply with a 1.8 m cable. The full charge recovery time with the DT-900 is the same as with the standard wired power supply – about two and a half hours. The cost of the Nokia DT-900 is about 35,7$.


 the Samsung Galaxy S4 Wireless S Charger Kit (inductive type) includes a charging stand and a new smartphone cover with integrated charging circuits. The currents for the power bank QI wireless charging are indicated on the components: the input is 5 V 2 A. The output is 5V 0.65A.The stand’s body is made of plastic. Its dimensions are about 161 × 91 × 12 mm. A gray semi-glossy material is used for the top panel. Its concave shape helps to hold the smartphone in the desired position during Qi wireless charging time. The main power bank’s body is glossy white. The dotted circle on the surface of the charged pad shows the optimal position of the smartphone for charging.

In the center of one of the short ends, there is a Micro-USB socket. A green LED is installed on the upper edge of the case. It lights up when the smartphone is installed on the stand and charging starts. Most of the bottom of the charger is made of rubber. This design feature allows the stand to hold firmly to the table. The time to fully replenish the Samsung Galaxy S4 by  this QI charger power bank device is about three and a half hours. The cost of the charger – 26,3$.

PowerQI T-100:

 a virtually light version of a wireless charger. The delivery set includes a stand, a power supply unit: 5 V 1.5 A with a Micro-USB cable, and a special receiver unit. The stand is made of white glossy plastic and measures 150 × 80 × 10 mm. The flat top of the device has slightly beveled edges and lacks any rubberized elements. The smartphone does not hold in place very well. The stand rests on four rubber feet. The LED lights up green when external power is available. When the smartphone is installed for charging, the color changes to blue. When charging starts, the station beeps.

The receiver has an output current of 600 mA. For smartphones that do not have such an opportunity, there are options in the form of covers with a connection via a standard Micro-USB. To operate the PowerQi T-100 system on a specific smartphone as a QI charger power bank, the user needs to purchase the appropriate receiver. The receiver is a flat antenna and a small board with a controller, which must be installed under the cover of the smartphone on the corresponding connectors. Charging time for a smartphone with a branded cover on the PowerQi stand is approximately 3 hours 30 minutes.The cost of the QI charger is $ 35. To use a power bank smoothly, the customer will also need to pay approximately $10 for the receiver.

Hoco CW24:

the device charges three devices simultaneously – smartphone, smartwatch, and headphones. The docking station is made of ABS plastic and polycarbonate with a thin rubber rim on the bottom. The rim fixes the device better on a flat surface. Docking station body size – 200x90x10 mm, weight – 130 g. There is a rubber mark in the shape of a plus sign in the charging area of ​​the phone. This navigator allows the user to put the phone on the charging station more precisely. On the side of the charger, there is an indicator that glows when the charger is connected to the mains and the charging process is in progress.

Hoco CW24 like any docking station or single device station have no to date any wireless charging for QI power bank option. To be replenished it connects to the mains via the included USB to Type-C cable. The input current is up to 2A. To work at full power the Hoco CW24 must be connected to an adapter. It supports 10W power and QC 3.0 fast charging function. The total power of the wireless charging is 10 W. To enable the safe work for QI power bank, the Smart Identification and Smart Wireless Charging function renders different power to each device. For Apple iWatch – up to 3W. For smartphones from 5 W to 10 W., depending on whether other devices are being charged on the platform at that moment. The cost of the charger is about 22,3 $.

Exelium Xpad 3.1: wireless charging is available for three devices simultaneously. The stand designed for Qi power bank has a rectangular surface made of aluminum on the bottom and glass on the top. Three zones are marked on the front glass surface, which are located directly above the coils. The kit includes rubber rings that the user can stick on to place the gadgets reliably and avoid slipping of the gadget during the vibration call. 

The power of the wireless charging zones from left to right: fast – 10 W, standard – 7.5 W, and for Apple Watch – 2 W. For each gadget, only a definite charging area is provided. The Xpad 3.1 is equipped with a 22.5-watt USB-C power supply that only operates in one 9V / 2.5A mode, so it’s not USB Power Delivery. The cost of Exelium Xpad 3.1 is about $ 95.8.

The Qi standard is gaining popularity. According to certain IT-experts, the appearance of public chargers not only in Starbucks cafes but also in airports and sports arenas with an wireless charging for QI power bank option will enter our daily life pretty soon. Just like it happened with Wi-Fi and Bluetooth.