Contactless Power Supply Coil Layout for Battery-Free Moving Bodies
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Solution Overview
Problem
Existing contactless electric power supply devices for moving bodies require large and heavy secondary-side transformer units and batteries, making the moving body cumbersome and inefficient, as power supply varies with position and requires additional charging circuits.
Innovation Solution
A contactless electric power supply device with multiple electric power supply elements and receiving elements arranged along a moving direction, using alternating current and a face-to-face power supply section to ensure continuous power delivery, eliminating the need for batteries and charging circuits by maintaining a face-to-face state for efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contactless electric power supply device uses secondary-side transformer units and batteries to supply power to moving bodies, then power supply stability is improved, but the moving body becomes larger and heavier
Solution Approach 1:
The invention extracts and removes the batteries and charging circuits from the moving body, placing only the electric power receiving element on the moving body while keeping the electric power supply elements on the fixed section. This extraction eliminates the weight of energy storage devices while maintaining continuous power supply through the face-to-face arrangement of supply and receiving elements.
Solution Approach 2:
The invention pre-arranges multiple electric power supply elements on the fixed section in a face-to-face arrangement with receiving elements, so that power supply is prepared in advance along the movement path. This preliminary arrangement ensures that the moving body receives continuous power without needing onboard energy storage.
2Reliability
If multiple primary-side transformer units are arranged at intervals along the entire movement range, then continuous power supply is improved, but device complexity increases
Solution Approach 1:
The invention segments the power supply system into multiple electric power supply elements arranged at intervals on the fixed section, each corresponding to a receiving element on the moving body. This segmentation allows continuous power supply through distributed elements while reducing the complexity of each individual unit compared to using fewer, larger transformers.
Solution Approach 2:
The invention introduces the face-to-face arrangement as an intermediary configuration between supply and receiving elements, enabling efficient electromagnetic coupling without requiring the moving body to carry heavy batteries. The alternating current power source serves as an intermediary that converts DC to AC for transmission through the supply elements.
3Power
If a large secondary-side transformer unit is provided on the moving body to increase driving force, then power output is improved, but the moving body becomes larger and heavier
Solution Approach 1:
The invention extracts the large transformer unit and batteries from the moving body, replacing them with a compact electric power receiving element. The power generation function is moved to the fixed section where multiple supply elements can be arranged, allowing the moving body to remain small and light while still receiving sufficient power.
Solution Approach 2:
The invention changes the spatial arrangement from a single large transformer on the moving body to multiple distributed supply elements on the fixed section in face-to-face arrangement. This dimensional redistribution allows power to be supplied externally, eliminating the need for large onboard transformers and energy storage devices.
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 solution enables a smaller, lighter moving body with stable power supply to the electric load, as the electric power receiving elements are smaller than the supply elements, and power is delivered efficiently without the need for additional charging circuits or batteries.
Implementation Method 1
multiple electric power receiving elements provided on a moving body configured to move along the moving direction, arranged separated from each other along the moving direction, and configured to receive the alternating current in a contactless manner by being electrically coupled with one of the multiple electric power supply elements that is positioned facing one of the electric power receiving elements
Data Source
AI summary
A contactless electric power supply device of the present invention is provided with: multiple supply coils and an alternating current power source arranged on a fixed section; multiple receiving coils and a receiving circuit provided on a moving body; and a face-to-face power supply section provided for each of the multiple supply coils and configured to supply alternating current power from the alternating current power source to the supply coils only when detecting a face-to-face state between the supply coil and the receiving coil; wherein separation distances and lengths in the moving direction of the multiple supply coils and multiple receiving coils are set to satisfy face-to-face conditions, and a receiving circuit converts alternating current power received by at least one of the receiving coils in the face-to-face state and generates a receiving voltage at least equal to a driving voltage.