In response to the industry problem of medium and high power wireless charging EMC, Wireless charging was included in the research project at the end of 2016. After nearly a year of targeted research by the Basic Research Department on wireless charging with 200W-3000W power, on the basis of solving the anti-interference EMS index, the EMI index has finally made a major breakthrough recently, exceeding the standard requirements, and can fully meet the product certification Claim.
In the third-party testing organization, Zhonghui Chuangzhi adopted the most stringent EMC testing standard EN55032B for switching power supply products, and conducted conducted interference, radiation horizontal and vertical tests. The conduction margin of the wireless charging module is 5.2dB minimum and maximum 19.1dB. The minimum radiation margin is 6.6dB and the maximum is 15.8dB. The specific results are shown in the figure below.
In terms of medium and high power, Wireless charging has launched wireless charging standard modules for 24V/36V/48V batteries in the fields of service robots, inspection robots, AGVs, drones, motorcycles, and power tools. It is suitable for all kinds of lithium batteries, lead-acid batteries and super capacitors. The charging process is completely free of manual intervention, safe and convenient, low maintenance cost, can be waterproof, dustproof and moisture-proof, and has strong adaptability to extreme environments. Recently, a breakthrough has been made in EMC indicators. The product application department will launch application circuits according to the arrangement, which is expected to be quickly applied to existing standard modules and solutions. It is reported that products such as food delivery, service, and companion robots need to obtain 3C certification in China. EMC indicators are an important consideration indicator. Wireless charging launched wireless charging modules that comply with EMC indicators, which eliminates the use of wireless charging for robot companies. An important concern for replacing contact charging.
At present, Wireless charging has become the first enterprise in the wireless charging industry to achieve medium and high power below 3000W in compliance with EMC indicator requirements. In the future, we will insist on technological innovation and management innovation, continue to uphold the concept of "power transmission, wireless freedom", and actively carry out product and technical collaboration with all parties, and strive to become a world-class supplier of wireless charging solutions.
Electromagnetic compatibility (EMC) is an extremely important quality indicator of electronic and electrical products. It is directly related to whether the product can obtain compulsory certification such as domestic 3C, US FCC, EU CE, etc. It is a key indicator for products to obtain market qualification. The EMC index includes two requirements: on the one hand, EMI, which means that the electromagnetic interference generated by the equipment in the normal operation process cannot exceed a certain limit; on the other hand, EMS, which refers to the electromagnetic interference of the appliance in the environment. Interference has a certain degree of immunity, namely electromagnetic susceptibility. Among them, EMI indicators are embodied in aspects such as conducted interference and radiated interference.
In the field of wireless charging, since magnetic energy is used for non-contact power transmission, EMC indicators are particularly important. Especially for medium and high power, it has always been a technical problem in the field of global wireless power supply. Conducted interference involves the prevention of mutual interference between the power grid and the wireless charging module, and radiated interference involves the prevention of mutual interference between the wireless charging module and other functional modules or the surrounding electromagnetic environment, which has always been a technical bottleneck in the industrial application of wireless charging. Especially for medium and high power, domestic and foreign companies have been unable to make breakthroughs, restricting the industry application and popularization of wireless charging.