Smart EAS Circuit Using Switched Inductive Coil
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Solution Overview
Problem
Electronic devices face challenges in integrating multiple functionalities such as NFC, wireless charging, and EAS due to the size and cost constraints of bulky components like inductive coils, which are typically used for a single purpose.
Innovation Solution
The integration of a smart EAS circuit that utilizes a single inductive coil to form different resonant frequencies for various functionalities by using switches to selectively couple the coil with different passive circuitries, allowing for multiple EAS circuits with distinct resonant frequencies and enabling the coil to function as both an inductive charger and a radio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single inductive coil is used for multiple functionalities (NFC, wireless charging, EAS), then device size and cost are reduced, but circuit complexity increases due to the need for selective coupling mechanisms
Solution Approach 1:
The patent implements a single inductive coil that can perform multiple functions including NFC communication, wireless charging, and EAS (electronic article surveillance) by selectively coupling different passive circuitries to the same coil through switches. This multi-functional approach reduces the overall device size and component count while maintaining all required functionalities.
Solution Approach 2:
The patent uses switches to dynamically reconfigure the coil's connectivity, allowing it to be selectively coupled with different passive circuitries based on the required function. This dynamic switching mechanism enables the same hardware component to adapt its behavior and electrical characteristics for different operational modes, resolving the contradiction between component sharing and circuit complexity.
2Adaptability or versatility
If multiple EAS circuits with different resonant frequencies are implemented, then adaptability to different security needs is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal EAS circuit architecture where a single coil can operate at multiple resonant frequencies by switching between different passive circuitries. Each passive circuitry is designed with specific capacitance values to establish different resonant frequencies, allowing the system to adapt to various security requirements without requiring separate dedicated EAS circuits for each frequency.
Solution Approach 2:
The patent changes the electrical parameters (specifically capacitance values) of the passive circuitries connected to the coil to achieve different resonant frequencies. By switching between passive circuitries with different capacitance values, the system dynamically adjusts the resonant frequency parameter to match different security system requirements, thereby achieving frequency adaptability without increasing the number of physical coils or major circuit components.
3Adaptability or versatility
If switches are used to selectively couple passive circuitries, then component versatility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functional circuitries (NFC, wireless charging, EAS with multiple frequencies) around a single shared inductive coil. The switches serve as coupling mechanisms that integrate these different functional blocks into a unified architecture, allowing them to share the common coil resource. This merging approach reduces the total number of discrete components while enabling versatile functionality through selective activation of different circuit paths.
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 solution reduces the overall size and cost of electronic devices by 'sharing' large components across functionalities, allowing for adaptable EAS activation based on security needs and enabling efficient use of inductive coils for multiple purposes.
Implementation Method 1
the antenna and the first passive circuitry form a passive electronic article surveillance (EAS) circuit with a first resonant frequency in the electronic device; and the inductor is simultaneously electrically coupled to the set of circuitry to form at least one of an inductive charger or a radio with a respective resonant frequency that is different from the first resonant frequency
Implementation Method 2
wireless charging capabilities, such as may be achieved via inductive coupling
Data Source
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AI summary
Systems and methods for a smart electronic article surveillance ("EAS") circuit that may be incorporated into electronic devices and used to selectively provide EAS and other functionalities. Such functionalities may be provided by "sharing" large electrical components across the different functionalities, which may include passive EAS capabilities, inductive charging, and/or wireless communications. One or more software or solid-state switches may be used to selectively and repeatedly change between the wireless communication/inductive charging capabilities and the passive EAS capabilities. The EAS functionality may be provided by using a switch to connect passive circuitry across an antenna component to form a passive EAS circuit. The non-EAS functionality may be provided by using the switch to de-couple the passive circuitry from then antenna and instead, couple the antenna to other electronic circuitry.