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Why is backwards compatibility with Qi 1.0 to 1.3 important?
Qi Version 1.3 was released as recently as 2021, when the global wireless charging market was valued at $5.48 billion. With sustainability awareness at an all time high among consumers, manufacturers of wireless charging devices will want to ensure backwards compatibility with Qi 1.3 and older so as to capture eco-conscious and late adopter sections of the market as well.
Qi wireless charging test components
Released in 2010, Qi 1.0 supported single coil, coil arrays, and moving coil designs to allow transmission of up to 5W of power. USB chargers were added to the equation in 2012, where Qi 1.1 upgraded the original specification by increasing the number of supported transmitter types to 12, giving rise to a greater variety of wireless chargers in the market. In addition, Qi 1.1 was the first time foreign object detection (FOD) was introduced for user safety.
In 2015, the Extended Power Profile (EPP) was introduced alongside Qi 1.2. This increased charging speeds to 15W and also introduced unique IDs and thermal tests to power receivers.
Markets with demand for wireless charging
Wireless charging has grown increasingly popular over the years, with the Nokio 920 being the first ever smartphone to feature built-in Qi wireless charging capabilities. By 2013, wireless chargers were already installed across 1,500 locations across the United States and a further 1,000 across Europe’s airports, hotels, restaurants, and cafes.
With a well-established customer base, wireless charging has grown from strength to strength over the last two decades, deployed across 2,700 types of products such as in-vehicle chargers, smartphones, and public spaces by 2018. The combination of inductive charging and magnetic resonance has proven to be a successful formula, and is projected to reach a total valuation of $34.65 billion by 2030.