BLE Earbud Role Switching for Balanced Battery Cycles
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Solution Overview
Problem
Existing Bluetooth Low Energy (BLE) earbuds face challenges in balancing battery cycles, leading to uneven battery usage and reduced lifespan due to inconsistent power consumption patterns, particularly when alternating between active and dormant modes.
Innovation Solution
Implementing a Bluetooth audio system on chip (ASOC) with low-power timer hardware and context-aware software to manage battery cycles by intelligently switching roles and power modes based on battery differential index (BDI) and timer expiration, ensuring even charging and discharging of earbud batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BLE earbuds continuously broadcast advertisements to maintain connectivity and functionality, then advertising reliability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The patent implements periodic advertising intervals where the earbud alternates between active advertising phases and dormant low-power phases. The system broadcasts advertisements at defined intervals rather than continuously, allowing the radio to enter sleep mode between transmissions. This periodic operation maintains advertising reliability by ensuring regular connectivity updates while significantly reducing average power consumption during extended periods when no audio stream is active.
2Use of energy by moving object
If one earbud operates in deep sleep mode to conserve battery, then power consumption is reduced, but the earbud cannot monitor for connection messages or broadcast advertisements
Solution Approach 1:
The patent implements dynamic role assignment where earbuds can switch between primary and secondary roles based on operational needs and battery status. The primary earbud maintains active advertising and monitoring capabilities while the secondary earbud enters deep sleep mode. This dynamic role switching allows the system to optimize power consumption by having only one earbud actively maintain connectivity at any given time, while the other conserves battery, yet both earbuds remain functional and can assume the active role when needed.
3Duration of action of stationary object
If the earbud frequently switches between dormant and active modes to balance battery cycles, then battery lifespan is extended, but connection stability may be affected
Solution Approach 1:
The patent implements preliminary role switching based on predicted battery differential. The system monitors battery levels and proactively switches the primary/secondary roles between earbuds before significant battery imbalance occurs. By anticipating when one earbud's battery will deplete relative to the other, the system pre-emptively transfers the active advertising role to the earbud with sufficient charge, ensuring continuous connection stability while balancing battery usage patterns to extend overall battery lifespan.
4Speed
If the earbud remains in active mode to maintain ready state for quick reconnection, then connection responsiveness is improved, but battery drain increases
Solution Approach 1:
The patent implements dynamic parameter adjustment of advertising intervals based on operational context. When the earbud is in active audio playback mode, advertising intervals are reduced for rapid reconnection capability. When in idle or dormant state, the system increases advertising intervals or suspends advertising temporarily, reducing power consumption while maintaining the ability to quickly resume normal advertising patterns upon detecting audio stream resumption or user interaction, thus balancing connection responsiveness with battery conservation.
Data Source
AI summary
Various embodiments include systems and methods for balancing battery cycles of paired earbuds. A processor in an earbud charging case may receive battery level information from a first earbud operating in a deep sleep mode, determine a battery differential index (BDI) value, and send an instruction message to the first earbud indicating the first earbud should switch roles with a second earbud. An earbud may start a timer upon beginning to operate in a dormant mode, transition from operating in the dormant mode to operating in a non-dormant mode in response to expiration of the timer, send a message to a paired earbud indicating that the earbud has transitioned, and receive a message from the paired earbud indicating that the earbud should switch from operating in the dormant mode to operating in the deep sleep mode and periodically broadcasting an advertisement.