Capacitive Power Transmission System with Direct Passive Electrode Connection
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Solution Overview
Problem
Existing power transmission systems using magnetic-field-coupling and electric-field-coupling face challenges in achieving high efficiency due to strict positional accuracy requirements and excessive stray capacitance, leading to low transmission efficiency and potential leakage of electromagnetic fields.
Innovation Solution
A power transmission system where the passive electrodes of the power transmitting and receiving apparatuses are directly electrically connected, stabilizing the potential and reducing stray capacitance, allowing for high-frequency high-voltage transmission with flexibility in positional alignment and contact methods, including the use of conductive materials like conductive rubber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic-field-coupling is used for power transmission, then power can be transmitted between apparatuses, but high accuracy is required in the relative positional relationship between coils and the sizes of the apparatuses cannot be reduced
Solution Approach 1:
The patent replaces magnetic-field-coupling with electric-field-coupling using capacitive electrodes. This substitution eliminates the need for precise positional alignment between transmitting and receiving coils, as capacitive coupling is less sensitive to relative position changes. The mechanical alignment requirement is relaxed while maintaining power transmission reliability.
Solution Approach 2:
The patent changes the coupling mechanism from magnetic to electric field-based. By using capacitive electrodes with appropriate capacitance values and configurations, the system achieves power transmission with reduced sensitivity to positional variations, effectively changing the physical parameter of field coupling type.
2Productivity
If the active electrodes are made close to each other to form a strong electric field, then power transmission efficiency improves, but the sizes of the passive electrodes need to be increased
Solution Approach 1:
The patent transitions from planar electrode arrangement to a three-dimensional configuration where active and passive electrodes are arranged in different spatial dimensions. The active electrodes face each other with small gaps while passive electrodes are positioned at different heights or orientations, reducing their required area while maintaining strong electric field coupling for high transmission efficiency.
3Volume of moving object
If the electrodes are arranged in a narrow vertically-long space or in a plane, then compact design is achieved, but stray capacitance becomes excessively high
Solution Approach 1:
The patent divides the electrode structure into segmented configurations where active and passive electrodes are separated in space rather than densely packed. By segmenting the electrode arrangements and positioning them in different spatial regions, the patent reduces unwanted stray capacitance between adjacent electrodes while maintaining the compact overall apparatus size.
Solution Approach 2:
The patent introduces dielectric materials as intermediaries between electrodes to control and reduce stray capacitance. These dielectric layers are strategically positioned to minimize parasitic capacitive effects while allowing the necessary electric field coupling for power transmission in compact spaces.
4Strength
If high capacitance is generated between passive electrodes, then coupling strength increases, but potential fluctuations occur and electromagnetic field leakage increases
Solution Approach 1:
The patent converts the potentially harmful effect of high capacitance into a beneficial feature by carefully controlling and optimizing the capacitance value. By selecting appropriate capacitance ranges and configurations, the system achieves strong coupling strength while the controlled capacitance prevents excessive potential fluctuations and electromagnetic field leakage, turning what could be a harmful parameter into an optimized design feature.
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 achieves high power transmission efficiency with reduced electromagnetic field leakage and fluctuations, allowing for flexible mounting and increased coupling efficiency without requiring precise positional accuracy between the transmitting and receiving apparatuses.
Implementation Method 1
the passive electrodes of the power transmitting and receiving apparatuses are directly electrically connected, stabilizing the potential and reducing stray capacitance
Implementation Method 2
The power transmitting apparatus side active electrode is connected to the power receiving apparatus side active electrode through capacitance
Implementation Method 3
a high-frequency high-voltage generator circuit that applies a high-frequency high voltage between the power transmitting apparatus side active electrode and the power transmitting apparatus side passive electrode
Data Source
AI summary
A power transmitting apparatus has a power transmitting apparatus side active electrode provided within the casing thereof along a seat. A power transmitting apparatus side passive electrode is exposed on a backrest. A power receiving apparatus has a power receiving apparatus side active electrode formed along the bottom surface thereof. A power receiving apparatus side passive electrode is formed on the outer surface of the casing of the power receiving apparatus. By mounting the power receiving apparatus on a mounting portion of the power transmitting apparatus, the power receiving apparatus side active electrode faces the power transmitting apparatus side active electrode with a dielectric layer therebetween, and the power receiving apparatus side passive electrode is directly electrically connected to the power transmitting apparatus side passive electrode.