Feed Unit Coupling Coefficient Calculation via Impedance
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Solution Overview
Problem
Existing non-contact power transmission systems face challenges in easily obtaining the coupling coefficient between power transmission and reception coils, often requiring complex methods involving dynamic control and additional sensors, which can be costly and cumbersome.
Innovation Solution
A feed system and unit that include a power transmission coil and a coupling coefficient calculation section, which measures frequency characteristics of the input impedance in a non-operating state of the rectification circuit to calculate the coupling coefficient, allowing for its determination without dynamic control and additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dynamic control and additional sensors are used to obtain the coupling coefficient, then the accuracy of coupling coefficient measurement is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the coupling coefficient measurement function from the power transmission operation, performing the measurement in a static state before power transmission begins. This separates the measurement function from the complex dynamic control system, allowing accurate coupling coefficient acquisition without requiring additional sensors or complex dynamic control mechanisms during power transmission.
Solution Approach 2:
The patent performs coupling coefficient measurement as a preliminary action before power transmission starts. By measuring the coupling coefficient in advance when the system is in a simple static state, the patent avoids the need for complex real-time measurement during dynamic power transmission, thereby reducing device complexity while maintaining measurement accuracy.
2Measurement precision
If dynamic control is performed to obtain the coupling coefficient, then the measurement accuracy is improved, but the operation complexity and time consumption increase
Solution Approach 1:
The patent performs coupling coefficient measurement as a preliminary action before power transmission starts. By measuring the coupling coefficient in advance when the system is in a simple static state, the patent avoids the need for complex real-time measurement during dynamic power transmission, thereby reducing device complexity while maintaining measurement accuracy.
Solution Approach 2:
The patent extracts the coupling coefficient measurement function from the power transmission operation, performing the measurement in a static state before power transmission begins. This separates the measurement function from the complex dynamic control system, allowing accurate coupling coefficient acquisition without requiring additional sensors or complex dynamic control mechanisms during power transmission.
3Measurement precision
If additional sensors are used to measure the coupling coefficient, then the measurement capability is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent makes the existing power transmission coil serve multiple functions: both power transmission and coupling coefficient measurement. By utilizing the same coil for both purposes, the patent eliminates the need for additional dedicated sensors, thereby reducing manufacturing costs and device complexity while maintaining the ability to accurately measure the coupling coefficient.
Solution Approach 2:
The patent enables the power transmission system to self-measure the coupling coefficient using its own components without external measurement devices. The system uses its existing coil and circuitry to perform self-diagnosis and parameter measurement, eliminating the need for additional sensors and reducing overall system cost and 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 the easy and accurate calculation of the coupling coefficient, simplifying the power transmission process, reducing costs, and minimizing system complexity while maintaining efficient power transfer.
Implementation Method 1
an electromagnetic induction method is well known
Implementation Method 2
a coupling coefficient calculation section configured to calculate a coupling coefficient between the power transmission coil and a power reception coil
Data Source
AI summary
The present disclosure includes a feed unit and a feed system. The feed unit includes a power transmission coil and a coupling coefficient calculation section. The power transmission coil is configured to transmit power to a power reception coil of a receiving unit using a magnetic field. The coupling coefficient calculation section is configured to measure frequency characteristics of input impedance of a rectification circuit of the receiving unit, the rectification circuit being in a non-operating state. The coupling coefficient calculation section is also configured to calculate a coupling coefficient between the power transmission coil and the power reception coil using the frequency characteristics of the input impedance of the rectification circuit that have been measured.