Wireless Charging Resonator With Human Body Detection Antenna
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Solution Overview
Problem
Existing wireless charging technologies struggle to accurately distinguish between conductors, metals, and human bodies due to similar electromagnetic interactions, making it difficult to safely operate and ensure user safety.
Innovation Solution
Incorporating an additional antenna adjacent to the transmission resonator to detect human bodies by sensing variations in signals at specific frequencies, allowing the controller to differentiate between conductors, metals, and human bodies based on impedance and phase changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a coil or resonator is used to generate a magnetic field for wireless power transmission, then power transmission capability is improved, but the ability to detect human bodies is worsened due to similar electromagnetic interactions with conductors and metals
Solution Approach 1:
The system segments the detection function by using two different sensing mechanisms: the coil/resonator for detecting conductors and metals through magnetic field interactions, and a separate antenna for detecting human bodies through electromagnetic interactions at a different frequency, allowing independent optimization of each detection mode
Solution Approach 2:
An antenna serves as an intermediary element that specifically detects human bodies by receiving electromagnetic signals at a frequency different from the power transmission frequency, mediating between the power transmission system and the human body detection function without interfering with the primary power transmission capability
2Measurement precision
If an additional antenna is added to detect human bodies, then human body detection accuracy is improved, but device complexity increases
Solution Approach 1:
The antenna serves multiple functions: it detects human bodies by receiving electromagnetic signals at a specific frequency, and can potentially serve as part of the communication system, reducing the need for separate components and mitigating the increase in device complexity
Solution Approach 2:
The antenna is integrated into the existing wireless power transmission device structure, combining the power transmission coil/resonator and the detection antenna in a unified system with shared control circuitry, thereby reducing overall system complexity despite adding detection capability
3Device complexity
If the coil or resonator is used for both power transmission and object detection, then device simplicity is maintained, but the ability to distinguish between different types of objects is worsened
Solution Approach 1:
The system dynamically switches between different detection modes by activating the coil/resonator for conductor and metal detection, and activating the antenna for human body detection, allowing adaptable response to different object types without requiring a fixed complex structure
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
Enhances safety by accurately identifying the presence or approach of human bodies, enabling controlled operation and preventing potential hazards.
Implementation Method 1
wireless charging techniques using electromagnetic induction or resonance
Implementation Method 2
form a magnetic field by the received electrical signal corresponding to the first frequency to transmit power
Implementation Method 3
resonance methods using resonance
Implementation Method 4
configured to receive a signal corresponding to a second frequency
Implementation Method 5
identify whether an object is present or whether an operation is approaching using the variation in impedance measured in the circuit
Data Source
AI summary
The disclosure provides a wireless power transmitting device and a method for detecting an approaching object by the wireless power transmitting device. According to the disclosure, a wireless power transmitting device may comprise: a power amplifier, a transmission resonator including a coil, and configured to receive an electrical signal corresponding to a first frequency, which is output through the power amplifier, and to form a magnetic field by the received electrical signal corresponding to the first frequency to transmit power, an antenna configured in a shape corresponding to any one side of a symmetrical axis of a split ring resonator (SRR) antenna, disposed adjacent to the transmission resonator, and configured to receive a signal corresponding to a second frequency, a sensing circuit configured to sense at least part of the signal corresponding to the second frequency transmitted to the antenna, and a controller configured to identify whether a human body approaches, based on a signal sensed through the sensing circuit. A first terminal of the sensing circuit may be connected to a first portion of the antenna, and a second terminal of the sensing circuit may be connected to the coil of the transmission resonator.