Segmented Coil Unit for Contactless Power Transmission
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Solution Overview
Problem
Existing coil units for contactless power transmission are limited in flexibility due to the inclusion of rectifier circuits, which increases the thickness and restricts usage, particularly in downsizing cell phone battery packs for efficient charging.
Innovation Solution
A coil unit comprising a coil, a wiring substrate with connection terminals, and a magnetic substance, separated from a coil control unit, allowing for greater flexibility in insertion and design, with options for flat coils, air-core coils, and multilayer magnetic substances to enhance transmission efficiency and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rectifier circuit is included in the battery pack lid to enable contactless power transmission, then power transmission function is achieved, but the thickness of the battery pack lid increases
Solution Approach 1:
The patent divides the battery pack lid into functionally independent modules: a coil unit (with coil and magnetic substance) and a control unit (with rectifier circuit and control circuitry). This segmentation allows the coil unit to be made thin while the control unit handles the power conversion functions, resolving the contradiction between achieving contactless power transmission and maintaining thin profile.
2Use of energy by moving object
If the battery pack lid includes integrated power transmission components, then power transmission capability is provided, but usage flexibility is significantly restricted
Solution Approach 1:
By separating the coil unit from the control unit, the patent enables the coil unit to be used in various configurations - it can be placed in the battery pack lid, or alternatively in the base station or other electronic devices. This modular approach provides significant usage flexibility while maintaining full power transmission capability.
Solution Approach 2:
The coil unit is designed as a universal component that can function in multiple roles and locations. It can serve as the transmitting coil in a base station, as the receiving coil in a mobile device, or be configured in different arrangements, thereby achieving multi-functionality and enhanced adaptability.
3Volume of moving object
If only coil and magnetic substance are used without additional structural support, then the coil unit is downsized, but shape maintenance becomes difficult
Solution Approach 1:
The patent employs a flexible substrate (such as a flexible printed circuit board) to support the coil and magnetic substance. This flexible substrate provides the necessary structural support to maintain the coil unit's shape and positioning, while being thin enough to preserve the downsized profile of the coil unit.
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 coil unit is downsized, offering greater flexibility in insertion and usage, improved transmission efficiency, and reduced thickness, enabling efficient contactless power transmission without the need for additional components like shield plates.
Implementation Method 1
contactless power transmission that uses electromagnetic induction to transmit power without using a metal contact
Implementation Method 2
a magnetic substance for receiving magnetic lines of force generated by the coil
Data Source
AI summary
A coil unit includes a coil formed by winding a coil wire, a wiring substrate, and a magnetic substance for receiving magnetic lines of force generated by the coil. The wiring substrate includes a connection terminal connected to both ends of the coil, an external connection terminal, and a wiring pattern for connecting the connection terminal and the external connection terminal. No circuit element other than the coil is mounted on the wiring substrate.