IEEE Power Electronics Magazine - September 2022 - 57

rankings for a given transmitter, thus invalidating the proposed
test protocol. Experiments to prove or disprove the
assumption that a single optimized receiver can be used
as a proxy to fairly compare and rank the real-world
power-transfer efficiency performance of Qi wireless
power transmitters were conducted. As a result of these
experiments, the WPC has concluded that because of
receiver-transmitter interaction, it is not possible to rank
transmitters by efficiency for more than one receiver
design but decreasing the transmitter's standby power
could save as much energy over a 24-h period as improving
full-power efficiency by 10%.
Introduction
The latest market research finds that " battery life remains
a top-ranked factor in consumer smartphone purchase
intentions in Europe, China, and the U.S. At the same
time, consumer satisfaction with both battery life and battery
charging times are stubborn pain points, consistently
appearing each year at the bottom of the list of user experiences. "
[1] Wireless charging has been the most impactful
feature introduced to address this problem since the
lithium-ion battery. Wireless charging entered the massmarket
growth phase when Apple adopted the Qi wireless
charging interface standard in early 2017, effectively ending
the wireless charging standards battle [2]. The
Wireless Charging Attach Rate of Global Smartphone Shipments (Rx)
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
50%
2012
2013
2014
2015
2016
2017
2018 2019
2020
2021
2022
2023
2024
2025
FIG 1 Percent of wirelessly charged cell phones shipped. Source: Strategy Analytics, Needham, MA USA: " 2021 Wireless Charging
Insights " (published Oct. 2021).
Qi-Certified Charging Unit Sales (RX + TX)
(Global, Unit Volume, Millions)
200
400
600
800
1000
1200
1400
1600
1800
2019
2020
2021
2022
Qi-Certified Wireless Charging (RX)
FIG 2 Five-year CAGR for Qi receivers and transmitters.
September 2022 z IEEE POWER ELECTRONICS MAGAZINE 57
2023
2024
2025
Qi-Certified Wireless Charging (TX)
*Includes phones, tablets, wearables & associated after-market accessories, embedded charging in vehicles and venues
25.5%
5-yr CAGR
22.9%

IEEE Power Electronics Magazine - September 2022

Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - September 2022

Contents
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