Inductive Charging Coil Segmentation for Implantable Device Safety
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Solution Overview
Problem
Conventional battery charging techniques for implantable medical devices, such as hearing prostheses, often require high-voltage charging signals that can damage voltage-limited communication components, necessitating additional circuitry or higher-voltage communication components, which are costly and complex.
Innovation Solution
An inductive charging system with a dual-function coil arrangement that limits voltage-limited power signals to prevent damage, using a voltage increasing converter to step-up the signals for battery charging and a voltage decreasing converter to ensure safe operation of voltage-limited components during data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-voltage charging signals are used to charge the battery, then charging efficiency is improved, but voltage-limited communication components are damaged
Solution Approach 1:
The charging system is segmented into two separate coil arrangements: a first coil arrangement dedicated to receiving high-voltage charging signals from an external charger, and a second coil arrangement dedicated to voltage-limited communication with the implantable device. This segmentation allows each component to operate within its optimal voltage range, enabling efficient charging while protecting communication components from damage.
Solution Approach 2:
A voltage converter is introduced as an intermediary component between the first coil arrangement and the battery. This converter steps down the high-voltage charging signals to a lower voltage suitable for battery charging, while isolating the voltage-limited communication components from the high-voltage charging path. The intermediary enables safe power transfer without exposing sensitive components to damaging voltages.
2Reliability
If additional circuitry or higher-voltage communication components are used to protect against high-voltage damage, then component safety is improved, but device complexity and cost increase
Solution Approach 1:
The system uses separate coil arrangements for charging and communication functions, eliminating the need for complex protection circuitry in the communication path. By physically segmenting the power and communication paths, the design achieves component safety through architectural simplicity rather than complex protective circuitry.
Solution Approach 2:
The voltage converter acts as an intermediary that safely interfaces the high-voltage charging path with the low-voltage battery, eliminating the need for voltage-limited communication components to be exposed to high voltages. This intermediary approach provides protection through functional separation rather than complex protection circuits.
3Device complexity
If a single coil arrangement is used for both charging and communication, then device complexity is reduced, but high-voltage signals damage communication components
Solution Approach 1:
The system segments the coil arrangements into two distinct functions: a first coil arrangement for high-voltage charging signal reception and a second coil arrangement for voltage-limited communication. This segmentation resolves the contradiction by allowing functional separation that protects components while maintaining relatively simple overall device architecture.
Solution Approach 2:
Each coil arrangement is specialized for its specific function (charging or communication), allowing both functions to operate optimally without compromise. The first coil arrangement handles high-voltage power transfer while the second handles low-voltage communication, achieving multi-functionality through specialized components rather than a single compromised component.
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
Enables safe and efficient charging of rechargeable batteries while maintaining the use of voltage-limited communication components, preventing damage and reducing system complexity, with controlled power transfer to maximize battery charging efficiency.
Implementation Method 1
an inductive coil arrangement configured to form an inductive charging link with the charging coil to receive power signals from the inductive charger
Data Source
AI summary
Embodiments presented herein are generally directed to inductive charging techniques in an implantable medical device system comprising an inductive charger and an external component. The external component includes a rechargeable battery and an inductive coil that is configured to form an inductive charging link with a charging coil in the inductive charger to receive power signals from the inductive charger. A voltage increasing converter in the external component is configured to step-up a voltage of the power signals received from the inductive charger for use in recharging the rechargeable battery.