Analysis on Key Points of Wearable Device Power Supply Design

Wearable devices have always been sold. In addition to being unable to grasp the pain points of users in experience, they have also failed to break through the technical defects. The problem of endurance has been criticized by people. Experts said that in the short term, it is difficult for the industry to find a perfect solution to meet the power design needs of wearable devices. At present, they are basically in the exploratory stage, but there are some people who may have found some ways.

Power design requirements of wearable devices

Dr. Wen Sihua first introduced several key factors that should be paid attention to in the power supply design of wearable devices. He said that the current mainstream wearable device batteries are mainly divided into two types. One is to use high-capacity and high-density disposable lithium batteries, which need to be replaced by users frequently, but it can save a lot of costs for manufacturers; The other is the more popular rechargeable battery, which is much smaller than the disposable battery in terms of capacity, but generally speaking, the battery capacity of wearable devices will not exceed 300mAh.

On the other hand, since wearable devices are often turned on, but many functions do not need to be turned on for a long time, and modules such as radio and EEPROM do not need to be powered on frequently, how to use effective battery management schemes to achieve flexible processing and maximize efficiency and prolong battery life, It is the key factor for the ultimate differentiation of product endurance. Dr. Wen said that Ti launched a battery management scheme based on ultra-low IQ step-down converter tps62740 ($2.5067), which can well meet the above-mentioned design requirements for flexibility.

Figure 1: ti's battery management scheme based on tps62740 ($2.5067)

In his speech, Dr. Wen also mentioned that wearable devices have small requirements for the size of battery modules, but the requirements for battery accuracy are increasing. How to achieve a small charging termination current is also one of the problems that need to be solved urgently. "Based on the requirements of small size and charging termination current, Ti has launched a lithium-ion battery charger: bq25100, which is tailored for low-power applications such as wearable devices." Dr. Wen introduced us that the bq25100 adopts 0.9 & tips; The 1.6mm WCSP package can support the charger solution with the size of only half of the previous generation; Bq25100 can accurately control the fast charging current as low as 10mA or as high as 250mA, and realize the charging termination as low as 1mA, so as to support micro lithium-ion button battery. In addition, bq25100 also supports leakage current less than 75na, which can solve the problem of battery loss caused by leakage current and prolong the service time of battery.

Figure 2: ti's small charger solution based on bq25100

Figure 3: comparison of battery life results caused by different leakage currents

Different from the traditional battery charging scheme

In addition to the most traditional USB power supply, Dr. Wen also provides us with two new ideas for the battery charging mode of wearable devices. One is the wireless charging scheme that has attracted much attention at present, and the other is the controversial energy acquisition scheme.

Energy ($50.4000) harvesting technology, that is, make full use of the surrounding energy and effectively convert it into electric energy that can be stored and collected. The key lies in energy efficiency and the amount of energy that can be collected. However, at present, this technology still has great challenges. For example, if additional components are added, a small amount of energy collected within one hour may be consumed in less than one second. Therefore, it is still controversial whether components for energy collection should be added.

Fortunately, there is not such a big technical obstacle to wireless charging, and many feasible schemes have appeared in the market. At present, Ti has also launched a wireless charging solution for wearable devices. On the receiving module of this scheme, we can see that in addition to applying the buck converter bq25100 mentioned above, It also adds a wireless charging receiver based on Qi standard - bq51003 ($1.4625).

Figure 4: wearable device wireless charging scheme (receiving module) launched by Ti

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