Objective With the increasing popularity of portable monitor,power management had become one of the most important indicators to assess the performance of the monitor.Considering the specialty and security of the monitor,we designed an intelligent management solution for monitor by using dual-battery balanced charge and hot backup.Methods In this solution,BQ24703 was used to control the charge of lithium batteries,dual-battery and hot backup were used to ensure that vice-battery could supply power timely in case the main battery being out accidently.Using PIC16F877A for battery management,we obtained battery capacity more accurately through the communication between PIC16F877A and BQ2085 by SMBUS.Meanwhile,using BQ29311 to charge the lithium batteries,we ensured that each battery could be fully used.In the circuit for charging protection,we utilized S-8224 and SFH-1412A(the fuse dedicated for Sony lithium battery)for twice protection to enhance the security and reliability of battery.Results This program provided a stable and secure power supply to the monitor.Conclusions This system not only enhanced the monitor′s continued working ability,but also met the clinical requirements.
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