What are the mainstream technologies for wireless charging?

- Jan 15, 2018 -

What are the mainstream technologies for wireless charging?

There are five mainstream wireless charging standards: Qi standard, Power Matters Alliance (PMA) standard, Alliance for Wireless Power (A4WP) standard, iNPOFi technology, and Power technology.

1.Qi standard

Qi is the world's first standardized organization to promote wireless charging technology, the Wireless charging standard (Power Consortium), which has two characteristics: convenience and versatility. First of all, different brands of products, as long as there is a Qi logo, can be recharged with Qi wireless charger. Secondly, it conquers the technical bottleneck of the universality of wireless charging. In the near future, products such as mobile phones, cameras, computers and so on can be charged with Qi wireless charger, providing a possibility for large-scale applications of wireless charging.

The mainstream wireless charging technology in the market is mainly through three ways, namely electromagnetic induction, radio wave and resonance, and Qi adopts the most mainstream electromagnetic induction technology. In terms of technology applications, Chinese companies have already stood at the forefront of the wireless charging industry. It is reported that the main application products of Qi in China are mobile phones. This is the first stage, and will be applied to different categories or higher power digital products later.

2, Power Matters Alliance standard

The Power Matters Alliance standard was launched by Duracell Powermat company, and the company is a joint venture between P & G and wireless charging technology company Powermat, which has excellent comprehensive strength. In addition to this, Powermat is also one of the support members of the Alliance for Wireless Power (A4WP) standard.

Three companies, AT&T, Google and Starbucks, have joined the PMA Alliance (Power Matters Alliance abbreviations). The PMA alliance is committed to creating a wireless power supply standard for mobile phones and electronic devices that meet the standards of the IEEE Association. It has a leading position in the field of wireless charging.

Duracell Powermat has introduced a WiCC charge card that uses the Power Matters Alliance standard. WiCC is larger than the SD card. It has embedded components for coil and electrode used for electromagnetic induction Contactless charging. The thickness of the card is thinner and can be inserted next to the existing smart phone battery. The card can make many portable terminals easily support Contactless charging.

3, A4WP standard

A4WP is the abbreviation of Alliance for Wireless Power standard. It is created by the United States Qualcomm Corp, Korea Samsung Corp and the wireless charging Union created by Powermat company. The alliance also includes members such as Ever Win Industries, Gill Industries, Peiker Acustic and SK Telecom. The goal is to set up technical standard and trade dialogue mechanism for wireless charging equipment, including portable electronic products and electric vehicles.

4, iNPOFi Technology

INPOFi ("invisible power field", "invisible energy field") wireless charging is a new wireless charging technology. Its wireless charging series uses intelligent electric transmission wireless charging technology, which has the characteristics of no radiation, high power conversion efficiency and weak thermal effect.

Compared with other existing wireless charging technologies, iNPOFi intelligent radiation less technology has no radiation to iNPOFi, and does not generate any radiation by electric field pulse mode. The test results of China's tyre laboratory show that the radiation added value is almost zero. In terms of efficiency, Theil laboratory also determined that the charging and transmission efficiency of the technology is as high as 90%, which has changed the problem of the low power conversion efficiency of the traditional wireless charging, which is at least 70%.

In the aspect of intelligent management, adopts the adaptation management technology, including: automatic opening and closing of the charging process; automatic adaptation of voltage and current needs of the management of charging process, to ensure that the charging efficiency is higher; and you can use a unified charging plate for electronic products, any brand, model, charging safe, convenient and efficient. In the aspect of safety, taking into account the safety problems in the weak charge, such as electrostatic ESD protection, overcharge protection, shock proof and so on, even if the electric power management device itself when there is a problem, can inpofi chip automatic fuse protection electronic equipment can not be damaged.

It is worth mentioning that the intelligent equipment manufacturers, inpofi with a tiny chip as the core, realize the fine design, only 1/4 50 Fen coin size, can be easily integrated into any equipment, can also be integrated into various types of wearable devices. This is a product of the traditional electromagnetic principle that can't be achieved.

INPOFi technology as a new generation of wireless charging technology standards, efficient, green, convenient, economic. The charging device using this technology includes two parts, the power emitting device and the power receiving device. The size and thickness of the launcher are equivalent to that of the ordinary mobile phone. The receiver is embedded in the protective sleeve of the mobile phone, and the mobile phone is sleeved on the protective sleeve, and is placed on the launcher for charging. In the process of charging, the phone does not need to plug any connection line. The correlation detection shows that the electromagnetic radiation is zero during the charging process and the conversion of energy efficiency reaches 94.7%, which is close to the wire charging. The charging equipment supports low voltage power supply, compatible with ordinary USB power supply, realizes low temperature charging, and ensures the safety and life of the equipment and battery.

5, Wi-Po Technology

Wi-Po technology, for Wi-Po magnetic resonance wireless charging technology, uses the high frequency constant amplitude alternating magnetic field generating device to generate the resonant magnetic field of 6.78MHz, and achieve farther transmission distance.

The technology realizes the communication control through Bluetooth 4, is safe and reliable, and can support one to many synchronous communication. At the same time, it has over temperature, over voltage, over current protection and foreign matter detection function. The technology

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