Battery Pack Control Circuit Sleep Mode Transition
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Solution Overview
Problem
Existing battery packs for electric power tools consume power continuously, even when not in use, leading to rapid battery depletion and reduced monitoring and control capabilities, especially when intermittently used.
Innovation Solution
A battery pack with a control circuit that includes a condition satisfaction determination unit, continuity satisfaction determination unit, and sleep-mode transition unit, which shifts the control circuit to a sleep mode only after predetermined conditions are met and maintained for a period, allowing for reduced power consumption while maintaining monitoring functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control circuit operates continuously to monitor battery state, then monitoring reliability is improved, but battery power consumption increases
Solution Approach 1:
The control circuit dynamically adjusts its operating state between active monitoring mode and low-power sleep mode based on real-time conditions. The circuit transitions to sleep mode when specific conditions are met (continuous monitoring confirmation, no tool operation, sufficient battery charge), and wakes up when conditions change, thereby adapting power consumption to actual monitoring needs rather than operating continuously.
2Use of energy by moving object
If power supply is completely shut down to save battery, then power consumption is reduced, but tool start-up time increases
Solution Approach 1:
Instead of continuous operation or complete shutdown, the control circuit employs periodic action by entering sleep mode for predetermined periods while maintaining the ability to wake up quickly when needed. The circuit uses a wake-up mechanism that can be triggered by tool operation detection or battery state changes, ensuring that while power is saved during idle periods, the tool can still start promptly when the user needs it.
3Use of energy by moving object
If the control circuit enters sleep mode immediately when load is disconnected, then power consumption is reduced, but battery protection capability deteriorates
Solution Approach 1:
The control circuit performs preliminary actions by continuing to operate briefly after load disconnection to confirm the idle state before transitioning to sleep mode. The system monitors for continuous idle conditions over a predetermined period and only then enters sleep mode, ensuring that transient operations or unexpected tool activations don't cause premature sleep mode entry that would compromise battery protection or tool responsiveness.
Data Source
AI summary
A battery pack for electric power tool is provided with a battery and a control circuit. The circuit includes a condition satisfaction determination unit, a continuation satisfaction determination unit, and a sleep-mode transition unit. The condition satisfaction determination unit determines whether each of at least one predetermined sleep-mode transition condition is satisfied, and determines whether an all-condition satisfaction state is present, which is a state wherein all of the at least one sleep-mode transition condition are satisfied. The continuation satisfaction determination unit determines whether the all-condition satisfaction state has continued for a predetermined period of time when the condition satisfaction determination unit determines that the all-condition satisfaction state is present. The transition unit stops part of operation of the circuit to shift the circuit to a sleep mode when the continuation satisfaction determination unit determines that the all-condition satisfaction state has continued for the predetermined period of time.