NFC Antenna Wireless Charging via Induced Current Detection
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Solution Overview
Problem
Current wireless charging systems for mobile devices require a separate charging receiver for each device, which is inconvenient for users with multiple mobile devices.
Innovation Solution
A method that utilizes a mobile device's existing NFC antenna to detect and redirect induced current above a threshold for an extended duration to a power management module for battery charging, eliminating the need for a dedicated charging receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate charging receiver is used for each mobile device, then wireless charging can be achieved, but device complexity and accessory requirements increase
Solution Approach 1:
The NFC antenna, originally designed solely for near field communication, is made multi-functional by enabling it to also serve as a wireless charging receiver. The antenna detects induced current from the charging station's electromagnetic field and redirects it to the power management module for battery charging, eliminating the need for a separate dedicated charging receiver.
Solution Approach 2:
The patent merges the NFC communication function and wireless charging reception function into a single antenna system. The NFC antenna structure and circuitry are utilized dual-purpose: for both NFC data communication and for receiving wireless charging energy through electromagnetic induction, thereby reducing the number of separate components needed.
2Device complexity
If an existing NFC antenna is used for charging, then device complexity is reduced, but current detection and threshold verification are required
Solution Approach 1:
The power management module continuously monitors the current induced in the NFC antenna and compares it against a predetermined threshold. When the induced current exceeds the threshold for a specified duration, the system activates charging mode. This feedback mechanism ensures reliable detection of the charging station's electromagnetic field while preventing false activation.
Solution Approach 2:
The system performs preliminary verification by monitoring the induced current level and duration before initiating battery charging. This preliminary detection phase ensures that the NFC antenna is properly positioned near a charging station and that sufficient energy is available, preventing improper or insufficient charging.
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 wireless battery charging without the need for a separate charging receiver, allowing multiple NFC-enabled devices to use a single charging station, improving convenience and reducing accessory requirements.
Implementation Method 1
NFC is a wireless technology that allows two devices to wirelessly communicate over a short distance of about 10 cm or less. NFC is standardized internationally within NFC Forum specifications and defined in, for example, ISO/IEC 18092, ISO/IEC 18000-3, ISO/IEC 21481, ECMA-340, ISO 14443, and the like, and any previous or subsequent versions. NFC technology is commonly used for contactless, short-range communications based on radio frequency identification (RFID) standards, using electromagnetic field induction to enable communication between electronic devices
Implementation Method 2
Charging receiver 104 then inductively receives energy via antenna 106 from an electromagnetic field generated by charging station 102
Data Source
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AI summary
A near field communication (NFC) antenna in a mobile device is used to wirelessly charge a battery in the mobile device by placing the mobile device on, or in very close proximity to, a charging station that emits an electromagnetic field. An induced current from the NFC antenna is detected that is above a predetermined threshold for longer than a predetermined duration. The induced current is used to charge the battery in the mobile device.