Considerations When Designing a Wireless Charging System
Introduction
Wireless charging is expected to grow from 500 million units in 2017 to 750 million units in 2018; consumer electronic devices lead this 33% increase back in 2015 and accelerated with the iPhone 8 and iPhone X releases thanks to the built-in wireless charging. 2,500.0 2,000.0 1,500.0 1,000.0 500.0 2013 Receivers Transmitters Receivers (y-o-y Growth) Transmitters (y-o-y Growth) Source: IHS Markit 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 300% 250% 200% 150% 100% 50% 0% Wireless Power Market Forecast Figure 1: Wireless Power Market Forecast This growth has also been the catalyst for ancillary product designs that now incorporate wireless charging.
Figure 1: Wireless Power Market Forecast
For many designers, this is their first exposure to a wireless charging design. The wireless charging technology often leads to several questions:
- Which wireless charging coil technology should I choose?
- What size coil should I use?
- How do I match transmitter and receiver coils for optimal efficiency?
- What power and efficiency could I expect from my design?
- What type of receiver coils can I use in my design?
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