Wireless Recharging Current Control Under Thermal Boundary Conditions
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Solution Overview
Problem
Conventional wireless recharging systems face challenges in managing heat dissipation effectively, particularly in medical devices where overheating can cause injury or discomfort, and existing solutions often cap charge current levels to prevent damage, limiting charging speed.
Innovation Solution
The implementation of a wirelessly recharged device equipped with multiple temperature sensors and a processor that uses a temperature model to determine the optimal charge current level, allowing for autonomous adjustment of the charging process based on real-time thermal data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charge current level is increased to enable faster charging, then charging speed is improved, but temperature increases causing overheating damage or injury
Solution Approach 1:
The system dynamically adjusts the charge current level based on real-time temperature measurements from multiple sensors. The processor continuously monitors temperature data and modifies the charging parameters accordingly, transitioning from a static capped current approach to a dynamic adaptive control system that optimizes charging speed while preventing overheating.
Solution Approach 2:
The system implements a feedback loop where temperature sensors continuously monitor the device and surrounding environment temperatures, and the processor uses this feedback to adjust the charge current level. This closed-loop control ensures that charging speed is optimized while maintaining temperatures within safe boundaries, directly addressing the contradiction between fast charging and overheating prevention.
2Measurement precision
If conventional temperature sensors are used to monitor internal device temperature, then internal temperature detection is achieved, but external temperature monitoring is insufficient for patient safety
Solution Approach 1:
The system divides temperature monitoring into multiple spatial locations by deploying several temperature sensors at different positions within the device housing. This segmentation of the monitoring function allows simultaneous measurement of internal device temperature and external surrounding temperature, providing comprehensive thermal awareness for both device integrity and patient safety.
Solution Approach 2:
The temperature sensing system is designed to serve multiple functions: monitoring internal device temperature for component protection, monitoring external temperature for patient safety, and providing data for dynamic charge current adjustment. This multi-functional approach resolves the limitation of conventional single-purpose temperature sensors.
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 enables faster and safer charging by dynamically adjusting the charge current based on thermal conditions, reducing the risk of overheating and improving patient comfort and safety in medical applications.
Implementation Method 1
The coil is configured to provide a level of charge current to the battery upon receiving an electromagnetic field
Implementation Method 2
Converting electromagnetic signal into charge current inherently generates some level of heating
Implementation Method 3
a temperature model generated from the level of charge current and the temperature data from the plurality of temperature sensors
Data Source
AI summary
Devices and methods described herein facilitate rapid wireless recharging, while reducing risk of injury, damage, or discomfort caused by heat generated during recharging. The embodiments described herein are useful in a variety of context, including for IoT devices, personal electronics, electric vehicles, and medical devices, among others. Such devices can prevent localized overheating of the device.