Wireless Charging Magnetic Positioning —— The Production of New Application of Radiation Ring in “Rotary Orientation Method”
In mid-October, Apple launched a brand-new iPhone12 mobile phone, which adopted a brand-new wireless charging technology, with a maximum charging power of 15 W.. At the same time, MagSafe magnetic wireless charger was introduced simultaneously. MagSafe’s magnetic wireless charging technology has opened a new era of mobile phone wireless charging, and many brands and accessories are actively deploying magnetic wireless charging product lines.
At present, most of the magnetic positioning schemes in the market are shown in Figure 1, which consists of three magnets, namely, a mobile phone end, a mobile phone protective cover and a charging end, all of which are oriented in parallel. The magnets in the mobile phone case and charger are slightly larger in diameter than those in the mobile phone, and they are designed with a non-magnetic area of about 1.5-1.7mm wide in order to increase the adsorption distance.
Next, the brand-new integrated magnetic positioning scheme of Ruidamei will be introduced.
The integrated magnetic attraction scheme of Ridamei is shown in Figure 2, and the magnet adopts radiation orientation. It only consists of two parts of magnets: mobile phone end and charging end.
The main features of the scheme are:
1. Large suction force and long adsorption distance. The magnetic field strength of the 1.5mm thick magnetic ring exceeds 2800Gs, and the suction force required for magnetic positioning can be achieved without placing magnets in the mobile phone protective cover. See the table below for the suction test of 1.5mm magnetic ring.
2. The magnetic ring has little interference. See the following table for the field strength distribution tested according to competing standards (field strength distribution 0.85mm away from magnetic ring).
3.Accurate positioning. Due to the special magnet orientation, the mobile phone and the sending end adopt magnetic rings with the same inner and outer diameters, and the positioning deviation is basically zero (the standard deviation of competing products is 1.55mm).
4.The assembly cost is low and there is no risk of wrong polarity.
5.independent intellectual property rights, no potential infringement concerns.
6. Compatible with MagSafe.
The above picture shows the test results of 15W transmitter and receiver after installing positioning magnetic ring (test at 25℃ for half an hour without air cooling): input 18.6W, output 14.3W, the highest temperature of transmitter is 36℃ (coil), and the lowest temperature is 31.5℃ (magnetic ring).
The above picture shows the test results of 30W transmitter and receiver after installing positioning magnetic ring (test at 25℃ for half an hour without air cooling): input 18.6W, output 30.1W, the highest temperature of transmitter is 47℃ (coil), and the lowest temperature is 35.7℃ (magnetic ring).
The above picture shows the charging curve (30W) of a brand of mobile phone after adopting the Rydamei magnetic attraction positioning scheme, and the ambient temperature is 25℃. 0-100% takes one hour and two minutes.
Introduction of Ruidamei Company
Shenzhen Ruidamei Magnetic Industry Co., Ltd., established in 2008, specializes in producing radiation oriented magnetic rings by adopting the “rotational orientation method”. “Rotation orientation method” is a unique method for producing sintered NdFeB radiation ring invented by Dr. Cheng Haojiao, founder of Ruidamei Company. The sintered NdFeB radiation ring produced by Ruidamei Company provides a broad space and imagination for researchers to develop international leading products, and it is hoped that new products developed by using the unique performance of the radiation ring will emerge constantly.
At present, the main application fields of radiation oriented magnetic ring are high-precision motors and automotive electronics (EPS, SBW, EVT, VVT, ESC, EBS), and its main customers include Bosch, Siemens, Ford, and electric products, etc., which are the core components to realize the unmanned driving function of automobiles.
In the field of consumer electronics, Ruidamei Company has developed a wireless charging and positioning magnetic ring scheme for mobile phones, which has been mass-produced. If there is any product demand, please contact Ruidamei.