Capacitive Power Jacket Using Device Chassis as Passive Electrode
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Solution Overview
Problem
Current non-contact power transmission systems face challenges in achieving high transmission efficiency due to the difficulty in securing sufficient facing areas between passive and active electrodes, which limits miniaturization and increases manufacturing costs.
Innovation Solution
A power transmission system and jacket configuration where the electronic device's chassis functions as a passive electrode, increasing the facing area between passive electrodes, and includes a second passive electrode connected to the power receiving jacket, enhancing coupling capacitance and stability without the need for a separate passive electrode in the jacket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a separate passive electrode is provided in the power receiving jacket, then the facing area between passive electrodes is sufficient for high transmission efficiency, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the function of the passive electrode with the chassis of the electronic device. The chassis is designed to serve dual purposes: as the structural housing for the device and as the passive electrode for power reception. This eliminates the need for a separate passive electrode component in the power receiving jacket, thereby reducing device complexity and manufacturing cost while maintaining sufficient facing area for high transmission efficiency
Solution Approach 2:
The chassis of the electronic device is given multiple functions: it serves as both the mechanical housing/structural support and as the electrical passive electrode for non-contact power reception. This multi-functionality approach allows the same component to fulfill both structural and electrical roles, reducing the total number of components needed in the system
2Loss of energy
If the facing area between passive electrodes is increased, then power transmission efficiency is improved, but the area occupied by electrodes on the power receiving unit increases
Solution Approach 1:
By combining the chassis structure with the passive electrode function, the patent utilizes the existing structural space of the electronic device housing to provide the electrode surface. This allows the facing area to be maximized without requiring additional dedicated space for separate electrode components, as the chassis itself provides the necessary surface area
3Ease of operation
If coil modules are used for magnetic field coupling, then non-contact power transmission is achieved, but miniaturization of the power transmitting and receiving units becomes difficult
Solution Approach 1:
The patent replaces the traditional magnetic field coupling method using coil modules with an electrostatic field-based non-contact power transmission system. This substitution uses capacitive coupling between active and passive electrodes instead of inductive coupling through coils, enabling more compact designs as electrostatic structures can achieve the same power transfer with smaller footprints
Solution Approach 2:
The patent changes the fundamental operating parameters from magnetic field coupling (inductive) to electrostatic field coupling (capacitive). This parameter change allows for different geometric configurations and smaller component sizes, as capacitive power transfer can be achieved with planar electrode structures that occupy less volume compared to coil assemblies
4Power
If coil modules are used as coupling electrodes, then power transmission is achieved, but heat generation affects storage battery and becomes a bottleneck on layout design
Solution Approach 1:
The patent substitutes the coil-based inductive power transmission system with an electrostatic capacitive coupling system. This replacement eliminates the resistive losses in coil windings that generate heat, as the capacitive coupling method operates with significantly lower losses and minimal heat generation, removing the thermal management bottleneck in layout design
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 configuration improves power transmission efficiency by widening the facing area between passive electrodes and stabilizing potential, reducing manufacturing costs while allowing for effective power transfer regardless of the jacket's attachment direction.
Implementation Method 1
a system for transmitting electric power using an electrostatic field is disclosed
Implementation Method 2
By forming the strong electric field between the active electrode on the power transmitting unit side and the active electrode on the power receiving unit side, the high power transmission efficiency is realized
Data Source
AI summary
A power transmission system and a power receiving jacket is provided that enhances the transmission efficiency of electric power with a simple structure and without increasing manufacturing costs. The power transmission system includes a power transmitting device having a first passive electrode, a first active electrode whose potential is higher than the first passive electrode, and a voltage generation circuit connected between the first passive electrode and the first active electrode, a power receiving jacket having a second active electrode and a power receiving circuit module connected to the second active electrode, and an electronic device attachable to the power receiving jacket. The electronic device includes a chassis having a conductive portion formed from a conductive material along a surface facing the first passive electrode, and the power receiving circuit module is electrically connected between the conductive portion and the second active electrode.