There are five mainstream wireless charging standards: Qi standard, Power Matters Alliance(PMA) standard, Alliance for Wireless Power standard, iNPOFi technology, and Wi-Fi technology.

1, Qi standard

Qi is the world's first standardization organization to promote wireless charging technology-Wireless charging Alliance(Wireless)

Examples of Wireless Charging

Examples of Wireless Charging

The "wireless charging" standard introduced by Power Control, referred to as WPC, has two major features: convenience and versatility. First, different brands of products, as long as there is a Qi logo, can be charged with a Qi wireless charger. Second, it has overcome the technical bottleneck of "universal" wireless charging. In the near future, mobile phones, cameras, computers and other products can be charged with Qi wireless chargers, providing the possibility for large-scale applications for wireless charging.

The mainstream wireless charging technology in the market mainly uses three methods, namely electromagnetic induction, radio waves, and resonance, while Qi uses the most mainstream electromagnetic induction technology. Chinese companies are already at the forefront of the wireless charging industry in terms of technology applications. It is reported that Qi's application products in China are mainly mobile phones. This is the first phase and will be used in different types or higher power digital products.

2, Power Matters Alliance standard

The Power Matters Alliance standard was initiated by Duracell Powermat, which is a joint venture between Procter & Gamble and Powermat, a wireless charging technology company, and has a relatively good comprehensive strength. In addition, Powermat is also one of the supporting members of the Alliance for Wireless Power(A4 WP) standard.

AT& already available T, Google, and Starbucks joined the PMA Alliance. The PMA Alliance is committed to creating wireless power supply standards for mobile phones and electronic devices that meet the standards of the IEEE Association and has a leading position in the field of wireless charging.

Duracell Powermat has introduced a WiCC charging card using the Power Matters Alliance standard. The WiCC is larger than the SD card and is embedded with components such as coils and electrodes for electromagnetic induction non-contact charging. The thickness of the card is relatively thin and can be used next to the existing smartphone battery. Using this card, many portable terminals can easily support non-contact charging.

3, A4 WP standard

A4WP is an abbreviation of the Alliance for Wireless Power standard. It was created by the Wireless Charging Alliance jointly established by Qualcomm, Samsung, South Korea, and Powermat. The alliance also includes members such as ever Win Industries, Gill Industries, Peicker Actic and SK Telecom. The goal is to establish technical standards and industry dialogue mechanisms for wireless charging devices for electronic products, including portable electronic products and electric vehicles.

4, iNPOFi technology

iNPOFi(`` Invisible power field ", IE" invisible energy field ") wireless charging is a new wireless charging technology. Its wireless charging series adopts smart electric transmission wireless charging technology, which has the characteristics of no radiation, high power conversion efficiency, and weak heat effect.

Compared with other existing wireless charging technologies, iNPOFi smart radiation-free technology has no radiation, adopts electric field pulse mode, and does not generate any radiation. The test results of China's Tail laboratory show that the radiation added value is nearly zero. In terms of efficiency, the Tell Laboratory also determined that the product of this technology has a charging transmission efficiency of more than 90 %, completely changing the problem of inefficient conversion of electricity up to 70 % of traditional wireless charging.

In terms of intelligent management, chip adaptive management technology is adopted, including: automatic opening and closing charging process; Automatically adapt the required voltage and current, manage the charging process to ensure higher charging efficiency; And can use a unified charging board, for any brand, model of electronic products, safe, convenient, efficient charging. In terms of safety, it also takes into account the safety problems in various weak electric charging, such as electrostatic ESD protection, anti-overcharge, anti-impact, etc., and even if the power management of the receiving device itself is in trouble, The inpofi chip can be automatically fused to protect the electronic device from damage.

It is worth mentioning that for smart device manufacturers, inpofi has a very small chip as the core and has achieved an ultra-fine design. It is only 1/4 of the size of a quarter coin and can be easily integrated into any device. It can also be integrated into various forms of wearable devices. This is something that traditional electromagnetic principles can not achieve.

As a new generation of wireless charging technology standard, iNPOFi technology is efficient, green, convenient and economical. The charging device using this technology consists of two parts: a power launcher and a power receiver. The size and thickness of the launcher are the same as those of an ordinary mobile phone. The receiving device is embedded in a mobile phone protection sleeve, and the mobile phone is put on a protective sleeve and placed flat on the launcher. Charge. During the charging process, the phone does not need to plug in any connection. The relevant test shows that the electromagnetic radiation in the charging process is zero, and the power efficiency conversion reaches 94.7 %, which is close to cable charging. The charging device supports low voltage power supply and is compatible with ordinary USB power supply; The low temperature charging can guarantee the safety and life of equipment and battery.

5, Wi-Fi technology

Wi-Fi technology, Wi-Fi magnetic resonance wireless charging technology, uses a high-frequency constant amplitude alternating magnetic field generator to generate a 6.78 MHz resonant magnetic field to achieve a longer launch distance.

The technology can realize communication control through Bluetooth 4.0, be safe and reliable, and can support a pair of multi-synchronous communication, but also have overtemperature, overpressure, overcurrent protection and foreign body detection function. Since the carrier used for this technology is a space magnetic field, energy will not be emitted like electromagnetic waves, so it will not cause radiation damage to the human body.

Wi-Fi magnetic resonance charging can be applied to various scenarios such as mobile phones, computers, smart wear, smart homes, medical devices, and electric cars.