Wireless Power Feeding Coil Separation Distance Calculation
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Solution Overview
Problem
Existing wireless power transmission systems require a vehicle height sensor to calculate the separation distance between the feeding and receiving coils, increasing cost, complexity, and size, which is undesirable.
Innovation Solution
A wireless power transmitting device that calculates the separation distance between the feeding and receiving coils by controlling the magnetic flux and using circuit characteristic values, eliminating the need for a special sensor by maintaining a constant magnetic flux intensity, allowing accurate estimation of the separation distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vehicle height sensor is used to calculate the separation distance between the feeding and receiving coils, then the measurement precision of the separation distance is improved, but the device complexity and cost increase
Solution Approach 1:
The wireless power transmission system uses its own operational parameters (circuit characteristic values such as impedance, resonant frequency, or quality factor) to determine the separation distance, rather than relying on external sensors. The system serves itself by utilizing the natural variation of its electrical characteristics with changing separation distance, thereby eliminating the need for separate measurement devices and reducing system complexity while maintaining measurement capability
Solution Approach 2:
The patent replaces the mechanical sensor-based measurement system with an electrical field-based measurement method. By monitoring changes in circuit characteristic values (electrical parameters) that naturally occur with separation distance changes, the system substitutes mechanical sensing with electrical sensing, simplifying the overall system architecture while achieving the same measurement objective
2Measurement precision
If a vehicle height sensor is used to calculate the separation distance, then the measurement precision is improved, but the manufacturing cost increases
Solution Approach 1:
The system uses its own operational parameters (circuit characteristic values such as impedance, resonant frequency, or quality factor) to determine the separation distance, rather than relying on external sensors. The system serves itself by utilizing the natural variation of its electrical characteristics with changing separation distance, thereby eliminating the need for separate measurement devices and reducing system complexity while maintaining measurement capability
Solution Approach 2:
The patent replaces expensive specialized sensors with standard, inexpensive electrical measurement components that are already part of the wireless power transmission system. By using readily available circuit elements and standard electrical measurement techniques, the system achieves separation distance measurement without requiring costly specialized hardware, thereby reducing manufacturing costs
3Device complexity
If the separation distance is not accurately calculated, then the device complexity is reduced, but unexpected voltage or current is generated causing element breakage
Solution Approach 1:
The system continuously monitors its circuit characteristic values and uses this feedback information to determine the separation distance in real-time. By establishing a feedback loop where the electrical characteristics inform the control system about the separation state, the system can dynamically adjust its operation to prevent unsafe conditions while maintaining simple hardware architecture
Solution Approach 2:
The patent performs separation distance determination before initiating power transmission by analyzing circuit characteristic values. This preliminary assessment allows the system to verify safe operating conditions and calculate appropriate transmission parameters in advance, preventing element breakage by ensuring that power transmission only occurs when separation distances are within safe ranges
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 accurate calculation of the separation distance without a special sensor, ensuring safe and efficient power transmission while reducing system complexity and cost.
Implementation Method 1
a feeding circuit including a power conversion circuit that converts DC power into AC power of a drive frequency and the feeding coil that receives the AC power supplied from the power conversion circuit to generate an AC magnetic field
Implementation Method 2
the inductance value of the feeding coil significantly changes with respect to a change in a separation distance between the feeding and receiving coils in their opposing direction
Data Source
AI summary
A wireless power transmitting device transmits power by wireless to a wireless power receiving device through magnetic coupling between a feeding coil and a receiving coil and includes: a feeding circuit including a power conversion circuit that converts DC power into AC power of a drive frequency and a feeding coil unit including the feeding coil that receives the AC power supplied from the power conversion circuit to generate an AC magnetic field; and a control circuit Stu that controls the amount of magnetic flux generated from the feeding coil. The control circuit Stu calculates a separation distance between the feeding and receiving coils in their opposing direction from the circuit characteristic value of the wireless power transmitting device in a state where the amount of magnetic flux generated from the feeding coil is controlled so as to be constant.