Wireless Power Receiver Position Detection Coils
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Solution Overview
Problem
In wireless power supply systems, particularly those adhering to the Qi standard, the inefficiency in charging due to misalignment of transmission and reception coils within housings makes it difficult for users to visually verify proper positioning, leading to reduced charging efficiency.
Innovation Solution
A wireless power receiver equipped with position detection coils and a position detection unit that estimates the relative position of the transmission coil based on detection signals from these coils, allowing for user notification of misalignment and improved charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wireless power supply is implemented using magnetic induction, then power transmission capability is improved, but positioning accuracy deteriorates because users cannot visually verify proper coil alignment
Solution Approach 1:
The patent introduces position detection coils as intermediary elements that mediate between the transmission coil and reception coil. These detection coils generate detection signals that indicate the relative position between transmission and reception coils, enabling accurate positioning measurement without interfering with the primary wireless power transmission function.
Solution Approach 2:
The patent replaces visual inspection (mechanical/optical method) with electromagnetic field-based detection. Instead of requiring users to visually verify coil alignment, the system uses position detection coils to generate electrical detection signals that automatically indicate positioning accuracy, substituting a mechanical/optical verification process with an electromagnetic sensing system.
2Measurement precision
If multiple position detection coils are added to the reception coil assembly, then positioning detection accuracy is improved, but device complexity increases
Solution Approach 1:
The position detection coils serve multiple functions: they detect positional information and simultaneously contribute to power reception. By making the detection coils multi-functional, the patent reduces the need for separate dedicated detection components, thereby limiting the increase in device complexity while maintaining improved positioning accuracy.
Solution Approach 2:
The patent merges the power reception function and position detection function into a unified coil assembly. The position detection coils are integrated with the reception coil structure, combining two functional systems into one compact assembly, which reduces overall device complexity compared to having separate independent detection systems.
3Difficulty of detecting and measuring
If position detection coils are provided to overlap the reception coil, then positioning detection capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements a nested coil structure where position detection coils are placed inside or overlapping with the reception coil in a concentric arrangement. This nesting approach allows multiple coils to share the same spatial envelope and mounting structure, simplifying the manufacturing process compared to arranging detection coils in separate locations.
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 precise detection of transmission coil position, enhancing charging efficiency by prompting users to correct device placement, thereby optimizing power transfer.
Implementation Method 1
The wireless power supply of the MI system uses magnetic induction between a transmission coil and a reception coil
Implementation Method 2
a plurality of position detection coils provided near the reception coil or provided to overlap the reception coil, and a position detection unit that detects a positional relation between the plurality of position detection coils and a transmission coil
Data Source
AI summary
A wireless power receiver receives a power signal from a wireless power transmitter, the wireless power receiver including a reception antenna including a reception coil, a rectifier circuit that rectifies a current of the reception antenna, a plurality of position detection coils provided near the reception coil or provided to overlap the reception coil, and a position detection unit that detects a positional relation between the position detection coils and a transmission coil of the wireless power transmitter based on a detection signal indicating an electrical state of the position detection coils. An electronic device includes the wireless power receiver. Another electronic device includes a wireless power receiver that receives a power signal from a wireless power transmitter and that can detect a position of a transmission coil of the wireless power transmitter, and a notification unit that notifies a user of information based on the position of the transmission coil.