Wireless charging technology III

2021-06-30 10:34:28
      1、 Mainstream technology

       There are five main wireless charging standards: Qi standard, power matters Alliance (PMA) standard, Alliance for wireless power (a4wp), inpofi technology and wi Po technology.

      1. Qi standard

       Qi is the "wireless charging" standard launched by Wireless Power Consortium (WPC), the world's first standardization organization to promote wireless charging technology. It has two characteristics of convenience and versatility. First of all, different brands of products, as long as there is a Qi logo, can use Qi wireless charger charging. Secondly, it has overcome the technical bottleneck of "universality" of wireless charging. In the near future, mobile phones, cameras, computers and other products can be charged with Qi wireless charger, which provides the possibility for large-scale application of wireless charging.

       The market mainstream wireless charging technology mainly through three ways, namely electromagnetic induction, radio wave, and resonance, and Qi uses the most mainstream electromagnetic induction technology. In terms of technology application, Chinese companies have been at the forefront of wireless charging industry. It is reported that Qi's application products in China are mainly mobile phones. This is the first stage, and it will be applied to different types or higher power digital products in the future.

      2. Power matters alliance standard

       Power matters alliance standard is initiated by Duracell Powermat, which is a joint venture between P & G and Powermat, a wireless charging technology company, and has excellent comprehensive strength. In addition, Powermat is one of the supporting members of alliance for wireless power (a4wp) standard.

       At & T, Google and Starbucks have joined the PMA alliance. PMA alliance is committed to creating wireless power supply standards for mobile phones and electronic devices that meet IEEE standards, and has a leading position in the field of wireless charging.

       Duracell Powermat has launched a wicc charging card, which adopts the power matters alliance standard. Wicc is one circle larger than SD card, and it is embedded with coils, electrodes and other components for electromagnetic induction non-contact charging. The thickness of the card is relatively thin, and it can be used when inserted next to the existing smart phone battery. Many portable terminals can easily support non-contact charging by using the card.

      3. A4wp standard

       A4wp is the abbreviation of alliance for wireless power standard, which is created by the wireless charging alliance jointly established by the United States' Qualcomm company, South Korea's SamSung company and the aforementioned Powermat company. The alliance also includes members such as ever win industries, gill industries, peiker acustic and SK Telecom. Its goal is to set technical standards and industry dialogue mechanism for wireless charging devices of electronic products, including portable electronic products and electric vehicles.


       Inpofi (invisible power field) wireless charging is a new wireless charging technology. Its wireless charging series products adopt intelligent electric transmission wireless charging technology, which has the characteristics of non radiation, high power conversion efficiency, weak thermal effect and so on.

       Compared with other existing wireless charging technologies, inpofi has no radiation, adopts electric field pulse mode, and does not produce any radiation. The test results of China Tel laboratory show that the added value of radiation is almost zero. In the aspect of high efficiency, Taier laboratory also determined that the charging transmission efficiency of the products with this technology is as high as 90%, which completely changes the low efficiency problem of the traditional wireless charging up to 70%.

       In the aspect of intelligent management, chip adaptation management technology is adopted, which includes: automatically turn on and turn off the charging process; Automatically adapt the required voltage and current, manage the charging process to ensure high 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 of various weak current charging, such as electrostatic ESD protection, anti overcharge, anti shock, etc. even if there is a problem in the power management of the receiving equipment itself, it can automatically fuse through the inpofi chip to protect the electronic equipment from being damaged.

      It is worth mentioning that, for smart device manufacturers, inpofi takes a tiny chip as the core to realize ultra micro design, which is only 1 / 4 of the size of 50 cents. It can be easily integrated into any device or into various forms of wearable devices. This is beyond the reach of traditional electromagnetic products.
      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: the power transmitter and the power receiver. The size and thickness of the transmitter 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 put on the protective sleeve, which is placed flat on the transmitter for charging. During the charging process, the phone does not need to plug in any cable. The relevant detection shows that the electromagnetic radiation is zero during the charging process, and the power efficiency conversion reaches 94.7%, which is close to the wired charging. The charging device supports low voltage power supply and is compatible with common USB power supply; Realize low temperature charging, effectively guarantee the safety and service life of equipment and battery.

      5. Wi Po Technology

       Wi Po technology, wireless charging technology for wi Po magnetic resonance, uses high-frequency constant amplitude alternating magnetic field generator to generate 6.78mhz resonant magnetic field and achieve longer transmission distance.
      The technology realizes the communication control through Bluetooth 4.0, which is safe and reliable, and can support one to many synchronous communication. It also has the functions of over temperature, over-voltage, over-current protection and foreign body detection. Because the carrier used in this technology is space magnetic field, the energy will not be emitted like electromagnetic wave, so it will not cause radiation damage to human body.
       Wi Po magnetic resonance wireless charging can be applied to mobile phones, computers, smart wear, smart home, medical devices, electric vehicles and other scenes.