Electrostatic Contactless Power Supply Parasitic Capacitance Reduction
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Solution Overview
Problem
Existing contactless power supply devices for industrial machines, such as board working machines, suffer from parasitic capacitance issues that lead to power loss and reduced efficiency due to the use of insulating materials, especially when the power supply electrodes are large and extend over significant distances to accommodate movable portions.
Innovation Solution
The electrostatic-coupling contactless power supply device employs power supply electrodes on a grounded fixing portion, insulated from the fixing portion, with high-frequency power source circuits and power receiving electrodes on a movable portion, using insulating supports to minimize parasitic capacitance by creating voids in the electrostatic-coupling regions, thereby reducing leak current and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating materials are used to insulate power supply electrodes from the grounded fixing portion, then electrical insulation is achieved, but parasitic capacitance increases causing power loss
Solution Approach 1:
The patent removes insulating materials from the electrostatic-coupling regions between the power supply electrodes and the grounded fixing portion. By extracting the insulating material that was causing parasitic capacitance, the invention eliminates the source of power loss while maintaining electrical insulation through alternative means (the grounded fixing portion structure itself provides insulation where needed).
Solution Approach 2:
The invention applies different properties to different regions: in the electrostatic-coupling regions, no insulating material is used to minimize parasitic capacitance, while in other regions where electrical insulation is critical, appropriate insulating structures are maintained. This localized approach optimizes both power transfer efficiency and electrical safety.
2Reliability
If power supply electrodes are extended to cover the moving distance of the movable portion, then continuous power supply is achieved, but the length of electrodes increases causing increased power loss
Solution Approach 1:
The patent extracts insulating materials from the extended regions of the power supply electrodes, allowing the electrodes to maintain their full length for continuous power supply coverage while eliminating the parasitic capacitance that would otherwise cause power loss across the extended electrode length.
3Reliability
If insulating materials are used between power receiving electrodes and the movable portion, then electrical insulation is ensured, but device complexity increases
Solution Approach 1:
The patent removes insulating materials from the power receiving electrode assembly, simplifying the device structure. Electrical insulation is maintained through the design of the movable portion and its relationship with the grounded fixing portion, eliminating the need for additional insulating components.
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 significantly reduces parasitic capacitance, minimizing power loss and enhancing power supply efficiency while reducing the amount of electrical insulating material used, thus lowering costs and improving power delivery to electrical loads.
Implementation Method 1
an electrostatic-coupling system in which a capacitor is formed by electrodes facing each other so as to be spaced apart from each other
Implementation Method 2
power receiving electrodes that are disposed on a movable portion movably mounted on the fixing portion, face the power supply electrodes so as to be spaced apart from the power supply electrodes, and receive the high-frequency power in a contactless manner
Implementation Method 3
a high-frequency power source circuit that supplies high-frequency power to the power supply electrodes
Data Source
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AI summary
An electrostatic-coupling contactless power supply device of the invention includes: power supply electrodes that are made of a conductive material and are disposed on a grounded fixing portion so as to be electrically insulated from the grounded fixing portion; a high-frequency power source circuit that supplies high-frequency power to the power supply electrodes; power receiving electrodes that are disposed on a movable portion movably mounted on the fixing portion, face the power supply electrodes so as to be spaced apart from the power supply electrodes, and receive the high-frequency power in a contactless manner; and a power receiving circuit that converts the high-frequency power received by the power receiving electrodes and supplies the converted high-frequency power to electrical loads provided on the movable portion. Insulating supports, which are made of an electrical insulating material and support the power supply electrodes, are disposed in a part of electrostatic-coupling regions in which parasitic capacitances are formed between the fixing portion and the power supply electrodes, and a remainder of the electrostatic-coupling regions forms voids. Accordingly, it is possible to improve power supply efficiency of contactless power supply in comparison with the related art. In addition, since the amount of the electrical insulating material used is reduced, it is possible to reduce the cost of materials.