Battery Management Circuit With Logic-Controlled Full Power-Off
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Solution Overview
Problem
Existing battery management systems in power tools fail to fully turn off when not in use, leading to continued battery power consumption and potential battery degradation, resulting in reduced battery life and usability.
Innovation Solution
A battery management circuit comprising a main control module, logic control module, and power control module that selectively turns off power to the main control module when the external device is not in use, using a logic-enable signal threshold to prevent mistaken reconnection and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the battery management system enters low-power mode when the power tool is out of use, then the energy consumption of the battery is reduced, but the main control chip and functional modules still consume battery power, leading to reduced available battery power and potential battery degradation
Solution Approach 1:
The battery management system is segmented into two independent parts: a low-power logic control module that remains active and a main control module that can be fully powered off. The logic control module monitors wake-up signals and controls the power supply to the main control module, enabling complete power isolation while maintaining system functionality.
Solution Approach 2:
The power control function is extracted from the main control module and implemented as a separate logic control module. This extracted logic control module has lower power consumption and can operate independently to manage the power state of the main control module, achieving full power-off capability.
2Speed
If the main control module remains connected to the battery in low-power mode, then the system can quickly respond to wake-up signals, but continuous power connection causes battery power depletion and reduced power supply duration
Solution Approach 1:
The logic control module is prepared in advance to monitor wake-up signals even when the main control module is powered off. Upon detecting a wake-up signal, it immediately restores power to the main control module, achieving fast response without requiring the main control module to remain powered.
3Device complexity
If the battery management system uses a simple power-off mechanism, then the device complexity is reduced, but the system may fail to fully turn off due to mistaken reconnection signals
Solution Approach 1:
The logic control module serves as an intermediary between the wake-up signal source and the main control module. It verifies wake-up signals through logic judgment before restoring power, preventing mistaken reconnection while maintaining simple overall system architecture.
Data Source
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AI summary
The present invention provides a battery management circuit comprising a main control module, a logic control module, and a power control module; the logic control module is configured to output a power control signal in response to receiving a logic-enable signal, and to skip outputting a power control signal in response to receiving no logic-enable signal; the power control module is configured to turn on the power supply from a battery to the main control module in response to receiving a power control signal from the logic control module, and to turn off the power supply from the battery to the main control module in response to receiving no power control signal from the logic control module; the main control module is configured to send a logic-enable signal to the logic control module when powered from a battery, and to skip sending the logic-enable signal to the logic control module when in a first predetermined state. The present invention improves the power supply duration of a battery or battery pack to improve user experience of a power tool.