Cut the cables and charge without wires
Imagine your smartphone’s battery is dead. Until now, you first must find the charging cable, then connect it to your phone and finally plug it into an outlet. The process works, but it can be a nuisance. Especially if your cable is playing hide and seek or if the jack doesn’t fit the cable. Wireless charging removes the hassle of re-fueling your devices. By using electromagnetic fields to transfer power from a transmitter to a receiver application, it charges your battery without a physical connection. All thanks to a wireless charging power supply.
Now compatible devices from a wide range of receiver applications can fuel up cable-free. Currently, inductive or resonant solutions can be used for the following applications:
- Smartphones and wearables
- Notebooks and tablets
- Power tools and service robots, such as vacuum cleaners
- Multicopters and electric toys
- Medical devices
- In-car charging
There are many reasons why you should choose wireless charging for your application. In addition to the obvious ones, like no need to plug in a device and no plug compatibility issues, it’s also safer since there is no contact with exposed electrical connectors. Further, it’s reliable in harsher environments, such as drilling and mining. It also allows for seamless on-the-go charging whether in the car or in public places. Finally, it eliminates tangled charging cables while allowing you to charge multiple devices in parallel.
Wireless charging standards
Currently two wireless charging standards stand out on the market: inductive and resonant. Here’s a detailed look at each and an overview of cutting-edge solutions from Infineon, which as a member of the Wireless Power Consortium (WPC) and the AirFuel alliance is actively shaping the wireless charging trends of tomorrow.
Inductive wireless charging - consumer applications
Qi (WPC), which supports single-coil and multi-coil inductive topologies and uses frequencies of 110-205 kHz, dominates the market today as measured by volume. Its widespread use can be attributed to its cost-efficiency. Inductive topologies always rely on in-band communication.
System diagram: inductive wireless charging
Resonant wireless charging - consumer applications
AirFuel offers a resonant technology that operates at 6.78 MHz. Advantages include better user-friendliness because you can freely place the device in the vicinity of the transmitter (typically up to 30 mm of vertical freedom), and it charges multiple devices of different size and power in parallel. AirFuel resonant communicates using Bluetooth low energy. To develop resonant solutions, two main topologies can be used: Class D (full-bridge or half-bridge) and Class E (single-ended or differential) amplifier.
System diagram: Resonant wireless charging – class D, full bridge
System diagram: Resonant wireless charging – class E, full bridge
Inductive wireless charging – in-car charging
Driver comfort, convenience and safety are advancing the growing presence of wireless in-car charging in the latest generation of cars. In fact, it’s predicted that most cars will have the feature in the very near future. The technology allows drivers and passengers to simply place compatible cell phones and tablets in a designated area – typically on a tray in the center console or in the glove box – where the devices can charge without a wired connection.
What counts in today’s wireless charging designs
Power efficiency is of utmost importance in any new power design and wireless in-car charging is no exception. Furthermore, a wireless in-car charging system is integrated alongside many other vehicle applications. This means you are challenged to design a wireless charging power supply that does not interfere with other systems. A partner with expertise in automotive and wireless charging applications can help you do so with ease – and ensure a fast time to market. Last but not least, in an era of smart everything, you want to ensure your project offers the right security and communication features.
Benefits of choosing Infineon
By sourcing wireless in-car charging components and solutions from Infineon you benefit from our broad portfolio of efficient, high-quality products as well as the proven know-how of an experienced automotive systems provider. Discover our complete solutions for automotive applications on a system level – something you won’t find just anywhere. And our product portfolio offers solutions for the two main wireless charging standards, Wireless Power Consortium and AirFuel Alliance.
System diagram: Wireless in-car charging
Mastering today’s wireless charging designs
Today, engineers look for semiconductor solutions that overcome a wide range of common wireless power transfer challenges. First and foremost, engineers require efficient and easy-to-design transmitter solutions. Smart heat management is also essential: it keeps the surface and transmitter at a comfortable temperature and avoids heating the battery of the device that’s charging. A small footprint is highly valued especially for devices that are small in size like wearables. By fitting your designs with a high power rating you can ensure faster charging speed, which will please consumers
Why Infineon is right for consumer and automotive applications
Having a reliable partner by your side is key to maximizing the performance and consumer appeal of your wireless charging designs. At Infineon, we help you master your design challenges with our broad selection of semiconductors, and latest and upcoming reference designs.
Choose Infineon to benefit from:
- A broad portfolio of MOSFETs, driver ICs, voltage regulators and, for certain applications, microcontrollers with software, for consumer and industrial designs
- Dedicated automotive products for in-car charging – MOSFETs, microcontrollers with software, DC-DC, LDO, PMIC with ASIL qualification
- Cutting-edge CoolGaN™ technology for frequencies in the MHz range, such as resonant AirFuel
- Powerful, cost-effective components for smart and safe wireless charging solutions
- Solutions for inductive and resonant standards – including innovative and unique reference designs for the adapter, transmitter and receiver for selected applications
- A lower customer bill-of-material thanks to cost-efficient packages, leading silicon technology, and upcoming new technologies
- A better user experience for consumers
Explore our portfolio and use our helpful wireless charging selection tool to find the best-fit solutions for your wireless charging power supply designs.