Wireless Charging Coil Position Detection and Attenuation Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing charging apparatuses for devices with wireless communication functions interfere with radio waves during charging, reducing the strength of the communication signals.
Innovation Solution
A charging apparatus that uses electromagnetic induction to charge secondary batteries, incorporating a position detection section and an attenuation prevention section, such as band-elimination filters, to minimize the impact on radio waves by detecting the position of the power reception coil and adjusting the resonance frequency to prevent attenuation of radio waves and magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electromagnetic induction charging is performed using a charging apparatus, then the secondary battery of the charging target device is charged, but radio waves for wireless communication are attenuated and communication is interfered with
Solution Approach 1:
The charging apparatus is divided into multiple independent position detection coils arranged in a matrix pattern, allowing selective activation of specific coils based on device position. This segmentation enables localized charging while minimizing interference with radio waves in other areas.
Solution Approach 2:
The patent implements different operational characteristics for different regions of the charging surface by activating only the position detection coils and power transmission coils that correspond to the detected device location. This local quality approach ensures that electromagnetic induction occurs only where needed, reducing overall radio wave attenuation.
2Measurement precision
If position detection coils are added to detect the position of the power reception coil, then charging accuracy is improved, but device complexity increases
Solution Approach 1:
The position detection coils serve multiple functions: they detect the presence of the charging target device, determine its position on the charging surface, and enable selective activation of power transmission coils. This multi-functionality reduces the need for separate detection and charging systems, thereby limiting complexity increase.
Solution Approach 2:
The position detection coils automatically detect device presence and position without requiring manual intervention or additional control systems. The system self-adjusts by activating appropriate power transmission coils based on the detected position, eliminating the need for complex external control mechanisms.
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
Effectively charges devices with wireless communication functions while minimizing the reduction in radio wave strength, ensuring stable communication capabilities during charging.
Implementation Method 1
transmits electrical power by an electromagnetic induction action to charge the secondary battery
Implementation Method 2
a position detection section that detects a position of a power reception coil
Implementation Method 3
an attenuation prevention section that prevents attenuation of radio waves or a magnetic field generated around the charging apparatus
Data Source
AI summary
A charging apparatus is provided that avoids a reduction in the strength of radio waves or a magnetic field used by a charging target device having a wireless communication function and reduces an influence on the radio waves or magnetic field. In this apparatus, position detection section (201) detects a position of power reception coil (251) of charging target device (150) placed on charging table (101). Power transmission coil (208) is made close to power reception coil (251) and transmits electric power. Coil moving mechanism (207) brings power transmission coil (208) close to the position of power reception coil (251) that is detected by position detection section (201).