Wireless Power Transmitter Detecting Antenna NFC Overvoltage
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Solution Overview
Problem
Wireless power feeding systems, particularly those adhering to the Qi standard, face reliability issues when interacting with devices using different standards like NFC or RFID, as the frequency mismatch can cause overvoltage and foreign object detection methods are inadequate for detecting such devices.
Innovation Solution
A wireless power transmitting device equipped with a detecting antenna operating in a second frequency band different from the primary frequency band, allowing for the detection and prevention of power transfer to devices with incompatible standards, thereby preventing overvoltage and ensuring reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power transmitting device transmits power in the first frequency band, then wireless power feeding to Qi standard devices is achieved, but reliability is reduced when devices with different standards (NFC, RFID) are present due to overvoltage
Solution Approach 1:
The detecting antenna performs detection in the second frequency band before the power transmitting device activates power transmission in the first frequency band. This preliminary detection identifies the presence of NFC or RFID tags, allowing the system to prevent power transmission that would cause overvoltage damage, thereby resolving the contradiction between maintaining power feeding functionality and preventing harmful effects.
Solution Approach 2:
The detecting antenna acts as an intermediary detection mechanism that operates in a different frequency band (second band for NFC/RFID detection) than the power transmission band (first band for Qi standard). This intermediary system enables the power transmitting device to identify foreign objects without directly exposing them to power transmission frequencies, thus preventing overvoltage while maintaining the ability to feed power to legitimate devices.
2Measurement precision
If foreign object detection is performed using conventional methods, then metal objects can be detected, but wireless devices with different standards (NFC, RFID) cannot be accurately detected
Solution Approach 1:
The invention adds a new dimension to detection by introducing a second frequency band specifically for detecting NFC and RFID tags. Instead of relying solely on conventional metal detection methods, the system operates in an additional frequency dimension (second band) that is sensitive to the resonant frequencies of NFC and RFID tags, thereby achieving accurate detection of wireless devices with different standards that were previously undetectable.
Solution Approach 2:
The system changes the detection parameter from conventional metal detection parameters to frequency-specific parameters tailored for NFC and RFID tag detection. By adjusting the operating frequency to match the resonant frequencies of NFC and RFID tags in the second frequency band, the detecting antenna achieves high measurement precision for these specific wireless devices, resolving the contradiction between detection accuracy and detection coverage.
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 effectively prevents reduction in reliability by accurately detecting and avoiding power transfer to devices with different standards, such as NFC or RFID tags, thereby maintaining the integrity of the wireless device.
Implementation Method 1
Power feeding based on the Qi standard utilizes electromagnetic induction between a transmitting coil and a receiving coil
Implementation Method 2
Power feeding based on the Qi standard utilizes electromagnetic induction between a transmitting coil and a receiving coil
Implementation Method 3
a detecting antenna having a resonant frequency in a second frequency band different from the first frequency band
Data Source
AI summary
A wireless power transmitting device includes a power feeder configured to transmit a power signal to a wireless power receiving device, and a detector configured to detect a wireless device in proximity of the power feeder for communication or power feeding separate from communication or power feeding for the wireless power transmitting device.