Inductive charging – wireless power transfer
Transfer wireless energy simply, efficiently and safely
The Wireless Power Consortium’s (WPC) Qi standard supports single-coil and multi-coil inductive topologies and uses frequencies of 110-205 kHz. In terms of sheer volume, it is the dominant standard on the market today. Inductive technology currently relies on in-band communication and enables wireless power to be transferred simply, efficiently and safely. For higher power designs out-of-band communication using Bluetooth is an option to improve data transfer capacity while providing a reliable communication interface between Transmitter and Receiver. The inductive WPC Qi standard has become extremely popular, fueled by the success of wireless smartphone charging. Looking ahead, wireless power transfer will also become a “must-have” feature in a wide range of other applications, including power tools, service robots and notebooks as well as medical and smart home devices.
Foreign object detection in inductive wireless charging
Foreign object detection (FOD) is a key challenge for manufacturers in the design of inductive wireless power systems. FOD is a safety mechanism in wireless power systems that automatically interrupts power delivery when interference from a foreign object is detected. This could be coins, paper clips and other metal objects – all of which can interfere with power delivery, significantly impacting efficiency and posing a major safety hazard for devices and end users. FOD is a vital design factor, especially in higher power systems as foreign objects heat up even more quickly in these environments. Infineon’s premium semiconductor components enable highly efficient foreign object detection due to the low capacitance figure of merit (FOMCoss) of our OptiMOS™ product family and a high-accuracy ADC in the XMC™ microcontroller family to determine power loss or quality factor deviation for safe and seamless wireless power operation.
Authentication for Qi wireless charging
The proliferation of low-quality chargers is starting to become a real issue in the global wireless charging market. These sub-standard chargers communicate according to the standard protocol but have not passed certification in a WPC lab. Thus, correct operation is not guaranteed which can lead to unintentional behavior of the transmitter and even damage receiving devices. The only way to fight this phenomenon is to enforce the standard, thus ensuring a uniform level of safety, security, and conformity. This can be achieved through a hardware authentication IC in a WPC Qi-certified transmitter establishing trust between the wireless charger and a power receiving device.
At Infineon, we are committed to keeping you, your data, and your devices secure. And this is exactly what the latest addition to our OPTIGA™ Trust family does. The OPTIGA™ Trust Charge is an integrated turnkey solution for authentication. Learn more about our turnkey solutions.
Webinar: Challenges and design considerations for next generation wireless power systems
Join our webinar and learn how to accelerate and simplify the development of safe, efficient wireless charging designs.
The trusted authentication solution for wireless charging
An increasing number of products and applications support wireless charging – driven by its obvious ease and convenience. However, an inaccurate power supply can be harmful to the device and, worst case scenario, even to the user.
15 W Qi transmitter (Tx) from Infineon for charging smartphones
Easy-to-use 15 W wireless charging – setup and GUI explained
OPTIGA™ Trust Charge - the trusted authentication solution
|Company||Company description||Region of operations||
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|Spark Connected is a product development and engineering solutions company delivering high technology in wireless power systems and battery management solutions. Spark Connected provides full system level wireless power solutions in both standards based and proprietary Inductive as well as proprietary Resonant technologies.||Americas, Asia-Pacific, Europe, Middle East, Africa, Greater China, Japan||Power, Microcontroller||Software, Hardware, Services||Full system level wireless power solutions. Software based intelligent control systems. Hardware receiver and transmitter architectures and design files. Design custom coils for non-standard applications and form factors. Support customers Integrate Spark Connected solutions into End-Products. Support Regulatory and Safety standards|