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According to the latest data released by IDC, global shipments of wearable devices are expected to reach 396 million units in 2020, an increase of 14.5% compared to 2019. If we look at the wearable segment, Hearables (audible wearables) accounted for nearly 60% of the total shipments, a very impressive performance.
One of the most important reasons behind such a large scale of Hearables is the rise of TWS true wireless headphones. Since the launch of Apple's AirPods in 2016, they have been a huge market success in a very short period of time.
From the end user's point of view, consumers are also increasingly demanding of TWS products - the sound quality of TWS should not be too poor, the latency should also be as short as possible, not to delay playing games and watching TV series; noise cancellation whether passive or active, in short, something should be done ...... Of course, there is also the most critical indicator, that is, the endurance of TWS should be as long as possible, the longer the better!
This has led to a boom in the overall TWS market, with suppliers the following suit. According to IDC's earlier market analysis, TWS headphones have been growing at 100% over the past few years, with 120 million units shipped in 2019 and expected to exceed 200 million by the end of 2020.
To be honest, it is difficult enough to squeeze the main Bluetooth chip, audio decoder, speaker, microphone, as well as memory, sensors, and other components into a headset weighing just a few grams, and even more difficult to fit a larger capacity TWS earphone coin cell.
Si x GP coin cell battery is China's first patent for a rechargeable Li-MnO2 battery button cell and the first patent for a laminated coin-type lithium-ion battery in China.
In a typical charging solution, the Li-ion battery in the charging compartment charges the TWS headset at 5V. Even though the headset battery voltage rises gradually as it is charged, the output voltage of the charging compartment - the input voltage of the headset's linear charger - remains at 5V, and this high voltage causes more power to be dissipated as heat, affecting overall efficiency.
The use of Dynamic Voltage Regulation (DVS) technology solves this problem - the voltage difference between the voltage at the output of the charging bin (the input voltage of the headphone linear charger) provided by the boost converter and the battery voltage changes as the battery voltage increases during the charging process, thus reducing energy loss and increasing efficiency.
As with other battery-powered, wirelessly connected products in the IoT era, TWS faces a serious power management challenge. Just as an electric car needs a 'charging station' to refuel and extend its range, the charging compartment of the TWS is a key part of improving the range of the headset. Fortunately, innovative technology is improving the longevity of the TWS experience, which will further drive the continued development of the TWS market as a whole, and lay the foundation for many more new concepts.