Wireless BMS Wake-Up Using Resonant Sound Waves
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Solution Overview
Problem
Existing wireless battery management systems (BMS) face challenges in power consumption optimization, particularly for slave nodes in standby states, as they need to periodically monitor wake-up signals from master nodes.
Innovation Solution
A wake-up apparatus and method using a resonant sound wave with a specified frequency and digital signal pattern to wake up slave nodes in a wireless BMS, reducing power consumption by allowing monitoring in a low-power state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slave nodes periodically monitor wake-up signals in standby state, then wake-up function is maintained, but power consumption increases
Solution Approach 1:
The patent applies mechanical vibration through resonant sound waves to wake up slave nodes. The master node generates acoustic signals at specific resonant frequencies that trigger vibration in the slave node's piezoelectric sensor, causing wake-up without requiring continuous electronic monitoring. This transforms the wake-up mechanism from electronic signal detection to mechanical vibration detection, significantly reducing standby power consumption while maintaining reliable wake-up functionality.
2Adaptability or versatility
If wireless communication is used, then installation flexibility is improved, but power consumption optimization becomes more difficult
Solution Approach 1:
The patent introduces acoustic waves as an intermediary medium for communication between master and slave nodes. Instead of direct RF communication that requires continuous monitoring, the system uses sound waves as a mediator to transmit wake-up signals. The acoustic intermediary allows the slave node to remain in low-power state while still receiving wake-up commands, resolving the conflict between wireless flexibility and power optimization.
3Speed
If RF signals are used for wake-up, then communication speed is maintained, but energy efficiency decreases
Solution Approach 1:
The patent replaces the electromagnetic RF system with a mechanical acoustic system for wake-up signaling. By substituting RF signals with resonant sound waves detected by piezoelectric sensors, the system achieves wake-up functionality with dramatically lower energy loss. The mechanical vibration approach eliminates the need for continuous RF monitoring, reducing energy consumption while maintaining adequate communication speed for wake-up purposes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces power consumption, extends battery life, and improves system efficiency by enabling low-power wake-up and robust signal transmission resistant to noise and environmental changes.
Implementation Method 1
the sound wave reception module is a sensor configured to convert the received resonant sound wave into an electrical signal and output the electrical signal and includes a piezo sensor
Implementation Method 2
A resonant sound wave may be detected with less energy than a RF signal. Accordingly, the function of waking a slave may be performed more energy efficient
Data Source
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AI summary
Disclosed herein are wake-up apparatus and method of a wireless battery management system, which can wake-up a slave node of a wireless battery management system in a standby state using a sound wave and include a master radio frequency (RF) node configured to output a resonant sound wave with a specified frequency and a specified digital signal pattern and a slave RF node which wakes up upon receiving the resonant sound wave output from the master RF node.