Supplementary Coil for Contactless Power Coupling Measurement
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Solution Overview
Problem
Conventional contactless electric power supply devices lack a simple configuration for measuring the degree of electromagnetic coupling and protecting against excessive current, leading to increased complexity and costs.
Innovation Solution
Incorporating a supplementary coil into the magnetic circuit of the contactless electric power supply device to measure the degree of electromagnetic coupling and monitor supply current, allowing for a highly functional device with added functionality while maintaining a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate displacement sensors, oscillation circuits, and inductance extracting means are added to measure gap size, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the measurement function into the existing supplementary coil that is already part of the contactless power supply circuit. The supplementary coil serves dual purposes: assisting in power transmission and measuring the degree of electromagnetic coupling (which reflects gap size). This eliminates the need for separate displacement sensors, oscillation circuits, and inductance extracting means, thereby maintaining measurement precision while reducing device complexity
Solution Approach 2:
The supplementary coil is designed to perform multiple functions simultaneously: it assists in electromagnetic coupling for power transmission and serves as a sensor to detect the degree of coupling (gap size). This multi-functionality approach allows the same component to provide both power supply and measurement capabilities, avoiding the need for additional dedicated measurement devices
2Ease of manufacture
If conventional contact-type multi-terminal connectors are used for power supply, then ease of manufacture is improved, but reliability deteriorates due to terminal deformation from repeated detachment and attachment
Solution Approach 1:
The patent replaces the mechanical contact-type multi-terminal connector system with a contactless electromagnetic coupling system. The power transmission is achieved through magnetic field coupling between coils on the pallet member and feeder device, eliminating physical connectors entirely. This substitution resolves the reliability issue of terminal deformation while maintaining ease of manufacture through standardized coil components
3Measurement precision
If a supplementary coil is added to measure electromagnetic coupling degree, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The measurement function is merged with the existing supplementary coil structure in the contactless power supply system. The supplementary coil, already necessary for assisting power transmission, is utilized to detect the degree of electromagnetic coupling by monitoring changes in its electrical characteristics. This integration provides precise measurement capability without adding separate measurement devices or increasing overall system 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
Enables precise measurement of electromagnetic coupling and control of supply current, preventing damage from excessive current and reducing costs by integrating these functions into the device's circuit configuration.
Implementation Method 1
contactless electric power supply device that supplies power in a contactless manner via electromagnetic coupling of a supply coil and a receiver coil
Implementation Method 2
a supplementary coil provided on the supply side device and interlinking with a magnetic circuit that electromagnetically couples the supply coil and the receiver coil
Data Source
AI summary
A contactless electric power supply device includes: a supply coil provided on a supply side device; a high frequency power source circuit that applies high frequency voltage to the supply coil; a receiver coil provided on a receiver side device that is arranged facing the supply side device, the receiver coil receiving high frequency electric power by contactless electric power supply via electromagnetic coupling with the supply coil; a receiver circuit that converts the high frequency electric power received by the receiver coil and supplies power to an electric load of the supply side device; and a supplementary coil provided on the supply side device, the supplementary coil interlinking with at least a portion of a magnetic circuit that electromagnetically couples the supply coil and the receiver coil.