Capacitance-Configured Wireless Power Transmission System
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Solution Overview
Problem
Existing wireless power transmission systems using electric field coupling methods fail to stabilize the reference potential of the power receiving device, leading to potential malfunctions, especially in portable devices where the reference potential is not adequately connected to external earth.
Innovation Solution
The power transmission system includes specific configurations of electrodes and capacitors in both the transmitting and receiving devices, with reference electrodes connected to respective reference potentials and capacitors, ensuring that the capacitance relationships between different capacitors stabilize the reference potential, such as Caa+Cpp < Cgg, C1a+C1p < Cgg, and C2a+C2p < Cgg, to maintain a stable reference potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reference potential electrodes are simply provided in the power transmitting device and power receiving device and made to oppose each other, then the structure is simple, but the reference potential of the power receiving device cannot be stabilized
Solution Approach 1:
The patent applies parameter changes by introducing specific capacitance relationships (Caa+Cpp<Cgg, C1a+C1p<Cgg, C2a+C2p<Cgg) to control the electrical characteristics of the reference potential stabilization system. By adjusting the capacitance values of capacitors C1a, C1p, C2a, C2p, and the coupling capacitor Cgg, the reference potential stability is improved without significantly increasing structural complexity.
Solution Approach 2:
The patent uses capacitors C1a, C1p, C2a, and C2p as intermediary elements between the reference potential electrodes and the respective power transmitting and receiving devices. These capacitors mediate the connection to stabilize the reference potential while allowing the electrodes to oppose each other with a gap, maintaining structural simplicity while improving reliability.
2Reliability
If capacitance relationships Caa+Cpp<Cgg, C1a+C1p<Cgg, and C2a+C2p<Cgg are established, then the reference potential is stabilized, but the device configuration becomes more complex
Solution Approach 1:
The capacitors C1a, C1p, C2a, and C2p serve multiple functions: they stabilize the reference potential, control the capacitance relationships to satisfy the inequality conditions, and enable the reference potential electrodes to oppose each other without direct contact. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while achieving reliable reference potential stabilization.
3Device complexity
If the reference potential of the power receiving device is not stable, then the structure remains simple, but malfunction occurs in the power receiving device
Solution Approach 1:
The patent implements preliminary action by pre-configuring the capacitance relationships (Caa+Cpp<Cgg, C1a+C1p<Cgg, C2a+C2p<Cgg) before power transmission begins. This preliminary configuration ensures that the reference potential is stabilized in advance, preventing malfunctions during operation without requiring complex real-time 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
This configuration effectively stabilizes the reference potential of the power receiving device, preventing malfunctions and ensuring reliable power transmission by connecting the reference potential of the receiving device to that of the transmitting device through capacitors, thereby reducing noise and fluctuations.
Implementation Method 1
a system using an electric field coupling method as a power transmission system. The power transmission system transmits electric power to a power receiving device from a power transmitting device when active electrodes of the power transmitting device and the power receiving device oppose each other and a strong electric field is formed between the two electrodes to establish electric field coupling between the electrodes
Implementation Method 2
a transmitting side first capacitor having a capacitance C1a connected between the transmitting side reference electrode and the transmitting side first electrode; and (iv) a transmitting side second capacitor having a capacitance C1p connected between the transmitting side reference electrode and the transmitting side second electrode
Data Source
AI summary
In a power transmitting device (101) and a power receiving device (201), active electrodes (13, 23), passive electrodes (14, 24), and reference potential electrodes (15, 25) oppose each other so as to make capacitance coupling, so that capacitances Caa, Cpp, and Cgg are generated. Capacitors having capacitances C1a, C1p, C2a, and C2p are connected to between the reference potential electrode (15) and the active electrode (13), between the reference potential electrode (15) and the passive electrode (14), between the reference potential electrode (25) and the active electrode (23), and between the reference potential electrode (25) and the passive electrode (24), respectively. The power transmission system (1) satisfies any one or more of the conditions of Caa+Cpp<Cgg, C1a+C1p<Cgg, and C2a+C2p<Cgg. With this, the power transmission system stabilizing a reference potential of the power receiving device is provided.