Hearing Aid Charging Protocol for Safe Wireless Pairing
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Solution Overview
Problem
The recharging process for rechargeable batteries in hearing aids faces challenges such as overheating and the need for effective communication between the charger and the audio processor to ensure proper charging, particularly in light-driven hearing aid systems.
Innovation Solution
A charging protocol is developed for rechargeable batteries in hearing aids, including a state machine for the behind-the-ear device and charger to synchronize and manage the charging process, ensuring safe and efficient battery charging while minimizing overheating and maintaining communication through unique IDs and low-power wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charging protocol is implemented for rechargeable batteries in hearing aids, then charging safety and efficiency are improved, but device complexity increases due to the need for state machines and communication protocols
Solution Approach 1:
The charging protocol implements bidirectional communication between the charger and audio processor, allowing the system to exchange charge status information and control charging parameters. The audio processor sends fuel gauge data and receives charging control commands, creating a feedback loop that enables safe and efficient charging while managing the complexity through structured data exchange.
Solution Approach 2:
The audio processor autonomously manages its own charging process by implementing a state machine that tracks charging status and communicates with the charger. The device self-regulates charging based on its internal battery state, reducing the need for complex external charging infrastructure and simplifying the overall system architecture.
2Measurement precision
If communication between charger and audio processor is enhanced to ensure proper charging, then charging accuracy is improved, but energy consumption increases due to wireless communication
Solution Approach 1:
The charging communication operates periodically rather than continuously, with the audio processor sending fuel gauge data at specific intervals and the charger providing charging updates at defined stages. This periodic communication approach maintains accurate charge status tracking while minimizing energy consumption by keeping the communication subsystem dormant between updates.
3Productivity
If charging current is increased to reduce charging time, then productivity is improved, but overheating risk increases
Solution Approach 1:
The charging protocol dynamically adjusts charging parameters based on real-time communication between the charger and audio processor. The system can modify charging current and voltage levels during the charging process, enabling high-speed charging when conditions permit while automatically reducing current when temperature thresholds are approached, thus balancing productivity with thermal safety.
Data Source
AI summary
Embodiments of the invention include a method of charging a rechargeable battery, the method comprising the steps of: detecting the presence of a rechargeable hearing aid in a hearing aid recharger; generating a unique random ID in the charger; transmitting the unique random ID to the hearing aid using an extremely low power protocol; demodulating the unique ID in the hearing aid; using the demodulated unique ID in a low power protocol to advertise the hearing aid on a network which includes the charger; associating the hearing aid to the charger when the charger which broadcast the unique ID receives that unique ID from a hearing aid using a wireless protocol; using the wireless protocol to communicate between the associated charging station and hearing aid; radiating power from the charger to the hearing aid; and ending the association when the hearing aid is removed from the charger.