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In the design of mobile devices, the working time of the battery is a crucial factor. Many mobile devices have added more features, which can quickly shorten runtime. Engineers must utilize complex power management methods in order to achieve the longest battery operation time.
Engineers need to use battery consumption decomposition to evaluate battery running time, which describes devices, firmware/software, and their sub circuits separately and integrated into the system. Decomposition techniques include describing battery current consumption and how it is affected by various operating modes and usage profiles. With this decomposition, engineers can make power management design trade-offs to maximize battery life.
Most power management systems save battery energy by putting inactive subsystems into sleep on a sub millisecond time scale. The result is that the device has a rapidly changing current during on/off events that occur within less than 1 second. For example, GSM mobile phones can have 560 μ s. The current level may drop to milliampere level during the Sleep cycle when the 2A pulse is in standby mode.
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