The author: Xuan Yin
IT House July 19-Microsoft Surface Book has had a lot of unique things since its birth and looks like a sense of the future. The two-in-one form can be used as a mature laptop and giant tablet, and while fans and enthusiasts welcome the new design, it also has some serious flaws.
As Microsoft explained in its recently released documentation:
The inclusion of a plurality of cells in an electronic device is a method of increasing the capacity at run time. when the parallel cells have the same charging characteristics (e. g., at a given time total capacity and a relatively charged state), the battery may be connected in series (to increase the voltage level) or in parallel (to maintain the same voltage level, But the operation increases the total capacity and has substantially the same charge and discharge rates.
However, if the selected battery has different charging characteristics, maintaining the battery life may depend on the normal operation of the battery with different charging and / or discharge rates. For example, charging a low-capacity battery at a higher than recommended charging rate can lead to a serious deterioration of the battery. Charging a high capacity battery at a lower charge rate will increase the charging time and may affect the performance of the battery during discharge.
To offset the above charging challenges, some systems separate batteries with different charging characteristics during charging. For example, high-capacity and low-capacity batteries can be continuously charged by a single charger sequentially or in parallel with a separate charger. Sequential charging of batteries is time-consuming, and there is a danger that sudden power outages will make different batteries in different charging states, so one battery will recharge on another battery at an unsafe rate.
Unlike sequential charging, parallel charging with different chargers is expensive and may lead to more complex balanced charging when the battery is reconnected after charging.
Of course, in addition to the charging challenges in the development of parallel battery circuits mentioned above, batteries with different charging characteristics can naturally discharge at different rates, resulting in different charging states. If two electrically coupled batteries have different charging states at any given time (for example, 20% charging and 70% charging), the higher charging batteries may attempt to discharge uncontrollably into another battery.
If the process discharges too high due to the voltage difference and resistance between the battery and the battery, current protection and/or damage to the service life of the receiving discharged battery may be triggered.
To solve this problem, Microsoft has developed a new technology through which current between batteries with different characteristics can be adjusted. As a result, the charging process is faster and more efficient.
The apparatus disclosed herein includes at least two batteries with different charging characteristics, which are connected in parallel and arranged to share a single charging node. The device also includes a charging control circuit which controls an adjustable resistor in the charging path between a single charging node and the first battery. The charging control circuit determines the charging rate of the first battery based on the detected battery parameters, and controls the adjustable resistance to charge the first battery at the determined charging rate.
Now that the technology has been developed, Microsoft is likely to use it in future Surface Book 3 devices.