Capacitive Contactless Power Supply With Fixed-Side Load Detection
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Solution Overview
Problem
Contactless electric power supply systems face inefficiencies and increased costs when using magnetic field resonance methods for short distances, and complexity on the movable section due to detection and communication circuits, which hinder stability and reduce equipment efficiency and cost-effectiveness.
Innovation Solution
A contactless electric power supply device with capacitive power transfer that detects the operating condition of the current consumer on the movable section from the fixed side, using electrode plates for capacitive coupling and a detection circuit to adjust the output voltage of the high-frequency power source, simplifying the movable section's circuit and integrating transmission and reception elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If magnetic field resonance method is used for contactless electric power supply over short distances, then power supply distance is extended, but equipment cost and device complexity increase significantly
Solution Approach 1:
The patent changes the fundamental parameter of the power supply method from magnetic field resonance to electrostatic coupling. This parameter change enables short-distance contactless power supply with simpler device structure and lower cost, while maintaining adequate power transmission efficiency for the intended application range.
Solution Approach 2:
The patent employs capacitor-based electrostatic coupling components which are simpler and less expensive than magnetic resonance components. The electrode plate structure and capacitor-based power transmission elements reduce equipment cost while being sufficient for short-distance applications.
2Loss of energy
If detection circuit and communication section are provided on the movable section for impedance control, then power transmission efficiency is improved, but movable section weight and size increase
Solution Approach 1:
The patent extracts the detection circuit and control section from the movable section and relocates them to the fixed section. This extraction eliminates the need for complex circuits on the movable section, reducing its weight and size, while maintaining the ability to detect operating conditions and control power transmission efficiency through the fixed-section-based detection circuit.
Solution Approach 2:
Instead of having the movable section detect and control impedance (conventional approach), the patent inverts the control architecture by having the fixed section perform detection and control. This inversion simplifies the movable section while achieving the same power transmission efficiency goals.
3Power
If deformation cable is used to supply electricity to movable section, then power supply is achieved, but risks of disconnections from metal fatigue and increased load weight occur
Solution Approach 1:
The patent replaces the mechanical cable-based power supply system with an electrostatic coupling-based contactless power supply system. This substitution eliminates the physical connection and associated problems of metal fatigue and disconnections, while providing reliable power supply to the movable section through capacitor-based electromagnetic coupling.
4Reliability
If detection circuit is provided on the movable section to detect operating condition, then power supply stability is improved, but circuit complexity and cost on movable section increase
Solution Approach 1:
The patent extracts the detection circuit from the movable section and relocates it to the fixed section. This extraction maintains the ability to detect operating conditions and ensure power supply stability, while eliminating the added circuit complexity from the movable section.
Solution Approach 2:
The patent uses the electric signal transmitted through the electrostatic coupling field as an intermediary to convey operating condition information from the movable section to the fixed section. This intermediary approach enables detection without requiring physical sensors or circuits on the movable section, maintaining stability while reducing complexity.
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 enhances the stability and efficiency of power supply to the movable section, reduces equipment costs, and maintains a stable operation by simplifying the movable section's circuit and integrating transmission and reception elements, while allowing for compact and lightweight design.
Implementation Method 1
electrostatic coupling methods using a capacitor configuration with opposing electrode plates
Implementation Method 2
electromagnetic induction method using a coil
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention of a contactless electric power supply device 1 comprises: a contactless electric power supply element 41 and a high-frequency power source circuit 5 provided on a fixed section 2, a contactless electric power reception element 6 and an electric power reception circuit 7 that supplies electric power to current consumer L on a movable section 3 which are provided on the movable section 3; and which further comprises a contactless transmitting element (integrated with 6) electrically connected to a contactless electric power reception element 6 provided on the movable section 3, a contactless reception element 42 that receives an electric signal related to the operating condition of current consumer L in a contactless manner from the facing and separated contactless transmitting element provided on the fixed section 2, and a detection circuit 8 that detects the operating condition of current consumer L based on the electric signal Sgnl from a contactless reception element 42 provided on the fixed section 2. From this, the operating stability of the current consumer L on the movable section 3 is higher while simplifying the electric circuit on the movable section 3 side, and the movable section 3 can be smaller and lighter reducing the supplied electric power and lowering equipment costs.