Battery-Shaped Wireless Power Receiver With Omnidirectional Ferrite Coil
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Solution Overview
Problem
Existing wireless power feeding systems are costly and inefficient, requiring complex resonant state detection and frequency tuning, especially when using series resonant circuits, and they often necessitate dedicated power feeding coils and circuits, making them unsuitable for easy integration into existing electronic devices.
Innovation Solution
The implementation of a wireless power feeding system that utilizes a parallel resonant circuit on the power feeder side and a ferrite coil with multiple windings on the power receiver side, allowing for power reception in any direction, thereby simplifying the power receiver configuration and enabling wireless charging without the need for complex communication or additional IC circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If series resonant circuit is used for wireless power feeding, then power transmission capability is improved, but system complexity and cost increase due to required resonant state detection and frequency tuning circuits
Solution Approach 1:
The patent changes the circuit configuration from series resonant circuit to parallel resonant circuit on the power feeder side. This parameter change eliminates the need for complex resonant state detection and frequency tuning circuits while maintaining power transmission capability, directly resolving the contradiction between power transmission and system complexity
Solution Approach 2:
The patent extracts and removes the complex communication IC circuits and resonant state detection circuits from the system. By using a parallel resonant circuit that inherently maintains resonance without active detection, the patent eliminates these unnecessary components, reducing system complexity and cost
2Reliability
If dedicated power feeding coils and circuits are implemented, then wireless power feeding performance is improved, but ease of integration into existing devices deteriorates
Solution Approach 1:
The patent makes the power receiver unit universal by designing it to work with both wireless power feeding and existing battery applications. The simplified parallel resonant circuit and ferrite coil configuration can serve multiple functions - wireless power reception and traditional battery operation - enabling easy integration into existing devices without requiring dedicated complex circuits
Solution Approach 2:
Instead of making the power feeder universal to support multiple receiver types, the patent inverts the approach by making the power receiver unit universal. The receiver is designed with simplified components that can work with any standard power feeder, reversing the traditional design paradigm and achieving better compatibility and ease of integration
3Manufacturing precision
If fixed-direction power reception coil is used, then manufacturing precision is improved, but adaptability to different device orientations deteriorates
Solution Approach 1:
The patent uses asymmetric winding arrangement on the ferrite coil where coils are wound in multiple directions (e.g., axial and radial directions) rather than uniform symmetric winding. This asymmetric multi-directional winding pattern enables the receiver to capture magnetic flux from power feeders at any orientation, resolving the contradiction between manufacturing precision and orientation adaptability
Solution Approach 2:
The patent transitions from single-directional (one-dimensional) coil winding to multi-directional (three-dimensional) winding on the ferrite coil. By adding spatial dimensions to the winding configuration, the receiver can effectively receive power from feeders positioned at various orientations, achieving both precision and versatility
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 reduces the complexity and cost of the power feeding system, allows for simultaneous charging and discharging of the internal secondary battery, and enables wireless power feeding in any direction, making it compatible with existing electronic devices without the need for modifications.
Implementation Method 1
a power feeding coil to generate electromagnetic waves
Implementation Method 2
a power reception coil to receive the electromagnetic waves emitted from the power feeding coil by electromagnetic induction
Implementation Method 3
using magnetic coupling of an LC resonant circuit
Implementation Method 4
electrical energy is supplied from the power feeder to the power receiver by the electromagnetic induction using a resonance phenomenon by a predetermined resonant frequency
Data Source
AI summary
A wireless power feeding system comprising a power feeder and a power receiver including a power reception coil, a power reception circuit unit for recovering energy generated in the power reception coil, and an internal secondary battery for storing energy. Electric energy is supplied from the power feeder to the power receiver by means of electromagnetic induction using a resonance phenomenon. The power receiver has an outer shape identical to that of a conventional battery, and has a power receiver housing accommodating the power reception coil, the power reception circuit unit, and the internal secondary battery. Further, the power receiver has two electrodes disposed in positions identical to those of the conventional battery. Further, the power feeder includes a power feeding base on which the power receiver can be mounted.