In-Vehicle Wireless Charging Control for High-Temperature Startup
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Solution Overview
Problem
Existing in-vehicle wireless electric power feeding systems cannot transmit power when temperatures exceed predetermined thresholds, leading to reduced power feeding time and potential failure during vehicle startup, especially in hot environments.
Innovation Solution
An in-vehicle wireless electric power feeding device with a temperature measurement unit and control unit that allows power transmission when temperatures are within a safe range, adjusting power levels based on temperature differences to prolong feeding time and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the predetermined temperature threshold is used to control power transmission, then device safety is ensured, but power feeding cannot start when temperature exceeds the threshold (e.g., in hot environments or at vehicle startup)
Solution Approach 1:
The patent applies dynamics by making the temperature threshold adjustable rather than fixed. The control unit dynamically changes the temperature threshold based on operational conditions: using a first (higher) threshold at startup to enable power feeding, and switching to a second (lower) threshold during normal operation to ensure safety. This dynamic adjustment resolves the contradiction between safety and power feeding opportunity.
Solution Approach 2:
The patent changes the parameter of temperature threshold based on operational state. By setting different threshold values (first threshold > second threshold) depending on whether the system is at startup or in normal operation, the patent enables power feeding in hot conditions while maintaining safety during sustained operation.
2Object-affected harmful factors
If power transmission is stopped when temperature exceeds the threshold, then overheating is prevented, but power feeding time is reduced and may fail completely in hot environments
Solution Approach 1:
The control unit dynamically adjusts the temperature threshold based on operational phase. During startup, a higher first threshold allows power feeding to proceed even in warm conditions, extending power feeding time. During normal operation, the lower second threshold prevents overheating while allowing continued operation under moderate thermal conditions.
Solution Approach 2:
The system performs preliminary temperature assessment at startup and sets the appropriate threshold in advance. By determining the initial temperature state and selecting the corresponding threshold before power feeding begins, the system prepares the optimal safety margin for the current thermal conditions.
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
The system improves power feeding opportunities at startup by controlling power transmission within safe temperature ranges, ensuring continuous power delivery even in hot conditions and maintaining device safety.
Implementation Method 1
a temperature measurement unit configured to measure a temperature of the electric power transmission unit
Implementation Method 2
wireless electric power feeding systems including an electric power reception device that consumes electric power and a wireless electric power feeding device that wirelessly performs electric power feeding to the electric power reception device
Data Source
AI summary
An in-vehicle wireless electric power feeding device is used in a vehicle, wirelessly performs electric power feeding to an electric power reception device (e.g., smartphone), and stops the electric power feeding at a temperature not lower than or higher than a predetermined first temperature threshold. The in-vehicle wireless electric power feeding device SD includes an electric power transmission unit that wirelessly performs electric power feeding to the electric power reception device, a temperature measurement unit that measures the temperature of the electric power transmission unit, and a control unit that controls the electric power transmission unit so that the electric power transmission unit wirelessly performs electric power feeding to the electric power reception device when the temperature measured by the temperature measurement unit at startup is not higher than or lower than a predetermined second temperature threshold higher than the first temperature threshold.