Coil Antenna Switching Circuit for Multi-System Usability
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Solution Overview
Problem
Existing antenna devices used for both NFC and non-contact power transmission systems suffer from low space usage efficiency due to unused coil antenna conductors, as they are not fully utilized in NFC systems, leading to wasted space and reduced performance.
Innovation Solution
An antenna device configuration featuring multiple coil antenna conductors with a switching circuit that allows for series and parallel connections, enabling efficient use of all conductors and adaptable antenna characteristics based on usage conditions, along with magnetic field coupling to enhance inductance and reduce conductor loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a second coil antenna conductor is added to enable both NFC and power transmission functions, then the antenna device can be used in multiple systems, but the second coil antenna conductor remains unused in NFC mode, resulting in reduced space usage efficiency
Solution Approach 1:
The patent applies the dynamics principle by introducing a switching circuit that dynamically changes the connection configuration of the second coil antenna conductor based on the operating mode. In NFC mode, the switching circuit connects the second coil antenna conductor in parallel with the first coil antenna conductor, making it actively contribute to the antenna function. In power transmission mode, the switching circuit reconfigures the connection to series arrangement. This dynamic reconfiguration ensures that the second coil antenna conductor is utilized in both operating modes, thereby improving space usage efficiency while maintaining multi-system versatility.
2Reliability
If coil antenna conductors are connected in series for power transmission, then the inductance value increases, but the conductor loss also increases
Solution Approach 1:
The patent applies the dynamics principle by using a switching circuit to dynamically select between series and parallel connection configurations based on the operating requirements. For power transmission applications requiring high inductance, the switching circuit configures the coil antenna conductors in series. For NFC applications where lower conductor loss is prioritized, the switching circuit switches to parallel configuration. This dynamic adaptability allows the system to optimize the trade-off between inductance value and conductor loss according to the specific operating conditions.
3Reliability
If separate NFC antenna and power transmission antenna are provided, then the antenna characteristics can be optimized for each system, but the device size, cost, and weight increase
Solution Approach 1:
The patent applies the universality principle by designing a single antenna device that performs both NFC and power transmission functions through one set of coil antenna conductors. The switching circuit enables the same physical conductors to be reconfigured for different operating modes, eliminating the need for separate NFC antenna and power transmission antenna. This multi-functional approach reduces device weight, size, and cost while maintaining optimized antenna characteristics for both systems through appropriate connection configuration.
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 increases the usage efficiency of coil antenna conductors, optimizes space usage, and allows for switching of antenna characteristics, achieving higher inductance values with reduced conductor loss, thereby improving the overall performance of the antenna device.
Implementation Method 1
a switching circuit to switch the first coil antenna conductor and the second coil antenna conductor between connection states including series connection and parallel connection
Implementation Method 2
a first coil antenna conductor wound around an axis and including a first end and a second end; a second coil antenna conductor wound around an axis and including a third end and a fourth end
Data Source
AI summary
An antenna device includes a first coil antenna conductor including first and second ends, a second coil antenna conductor including third and fourth ends, and a switching circuit. The first coil antenna conductor is wound around an axis and the second coil antenna conductor is wound around an axis. The switching circuit switches a connection state of the first coil antenna conductor and the second coil antenna conductor between connection states including series connection and parallel connection.