Wireless Charging Current Control for Battery Temperature Management
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Solution Overview
Problem
Existing battery charging technologies for electronic devices face challenges in efficiently managing battery temperature and ensuring continuous charging, particularly during contactless charging, where variations in temperature and power supply can lead to interrupted charging processes.
Innovation Solution
The electronic apparatus incorporates a temperature detector, a charging unit, a power reception coil, a supplying unit, and a determination unit to set an initial high supply current for charging and adjust it based on temperature, ensuring continuous charging by dynamically managing the charging current and system current to maintain efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supply current is increased to ensure continuous charging, then the charging reliability is improved, but the battery temperature increases causing safety issues
Solution Approach 1:
The patent implements dynamic current adjustment by switching between a first supply current (higher) when charging starts and a second supply current (lower) when continuous charging is confirmed. This dynamic adaptation allows the system to ensure charging continuity initially while preventing excessive temperature rise during sustained charging operations.
Solution Approach 2:
The system changes the electrical parameter (supply current) based on charging state detection. By detecting whether continuous charging is occurring and adjusting the current parameter accordingly, the system resolves the contradiction between ensuring charging reliability and preventing temperature-related safety issues.
2Object-affected harmful factors
If the supply current is reduced to lower battery temperature, then the safety is improved, but the charging efficiency decreases leading to interrupted charging
Solution Approach 1:
The system dynamically adjusts the supply current based on real-time detection of charging continuity. During the initial phase or when interruptions are detected, a higher current maintains charging efficiency. When continuous charging is confirmed, the current is reduced to control temperature, thus resolving the contradiction between safety and productivity.
3Device complexity
If a fixed supply current is used regardless of temperature, then the device complexity is reduced, but the charging reliability decreases due to interruptions
Solution Approach 1:
The patent implements a dynamic charging control system that adjusts supply current based on detected charging continuity. This dynamic approach, while increasing control complexity, ensures charging reliability by adapting to actual charging conditions, resolving the contradiction between device simplicity and charging reliability.
4Productivity
If the supply current is increased to maintain high charging efficiency, then the productivity is improved, but the battery temperature rises causing safety hazards
Solution Approach 1:
The system employs dynamic current adjustment, using higher supply current during initial charging or when efficiency is prioritized, and switching to lower current when continuous charging is detected to control temperature. This resolves the contradiction between maintaining high charging efficiency and preventing temperature-related safety hazards.
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 solution ensures stable and continuous battery charging by adapting the supply current to temperature changes and system demands, minimizing interruptions and maintaining high charging efficiency even under varying power supply conditions.
Implementation Method 1
a power reception coil, which receives first electric power transmitted in a contactless manner from a power transmission coil of a contactless charging device
Data Source
AI summary
A temperature detector detects a temperature of a battery. A charging unit charges the battery. A power reception coil receives a first electric power transmitted in a contactless manner from a power transmission coil of a contactless charging device. A supplying unit supplies the charging unit with a second electric power on the basis of the first electric power. A setting unit sets a supply current to be supplied from the supplying unit to the charging unit. A determination unit determines whether the battery is continuously charged. The setting unit sets the supply current to a value larger than a settable minimum value regardless of the temperature of the battery when the charging unit starts charging the battery on the basis of the second electric power, and reduces the supply current as the temperature is higher when the determination unit determines that the battery is continuously charged.