NFC Transmitting Coil Q Switching for Charging and Communication
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Solution Overview
Problem
The existing NFC communication modules in consumer terminal devices face a conflict between NFC communication and NFC charging due to differing quality factor requirements, leading to poor charging efficiency and user experience, as the same coil is used for both functions with incompatible quality factor values.
Innovation Solution
A terminal device with a transmitting circuit that includes a matching network and a transmitting coil, where a resistance switching circuit adjusts the quality factor value by changing the resistance value, allowing the circuit to switch between different quality factor values for communication and charging modes, ensuring compatibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transmitting coil is used for both NFC communication and NFC charging, then device complexity is reduced and cost is lowered, but charging efficiency deteriorates due to conflicting quality factor requirements
Solution Approach 1:
The patent applies dynamics by making the quality factor of the transmitting coil adjustable rather than fixed. A resistance switching circuit dynamically changes the resistance value connected to the transmitting coil based on the operating mode (communication or charging), thereby dynamically adjusting the quality factor to suit different functional requirements while using a single coil
Solution Approach 2:
The patent changes the electrical parameter (quality factor) of the transmitting coil by adjusting the resistance value in the circuit. During NFC communication, a first resistance value is applied to achieve a first quality factor suitable for communication rates. During NFC charging, a second resistance value is applied to achieve a second quality factor that reduces energy loss and improves charging efficiency
2Productivity
If the quality factor of the transmitting coil is adjusted for NFC charging, then charging efficiency is improved, but compatibility with different NFC communication rates deteriorates
Solution Approach 1:
The resistance switching circuit provides dynamic adjustment capability, allowing the system to switch between different resistance values based on the required function. This dynamic adjustment enables the single transmitting coil to adapt to different communication rates when needed while optimizing for charging efficiency when in charging mode
Solution Approach 2:
The system periodically switches between different resistance configurations depending on the operational mode. The resistance switching circuit responds to mode changes by adjusting the resistance value, enabling the transmitting coil to maintain appropriate quality factor for the current operation whether it be communication or charging
3Productivity
If a resistor is connected to adjust the quality factor of the transmitting coil, then charging efficiency is improved, but device complexity increases
Solution Approach 1:
The resistance switching circuit serves multiple functions: it adjusts the quality factor for charging efficiency, maintains compatibility with different communication rates, and enables mode-dependent optimization. By making this single circuit element multi-functional, the patent avoids adding separate dedicated circuits for each function, thereby limiting the increase in device complexity
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 enables flexible control of the quality factor value, ensuring compatibility with different communication rates during wireless communication and improving charging efficiency by reducing losses, while also reducing device costs by sharing coils for both functions.
Implementation Method 1
The matching network is configured to perform impedance matching on a received alternating current power signal and then the received alternating current power signal to the transmitting coil
Implementation Method 2
The matching network includes a parallel resonant capacitor connected in parallel to the transmitting coil
Implementation Method 3
The resistance switching circuit is configured to adjust a quality factor value Q of the transmitting circuit by changing a resistance value of the resistance switching circuit
Implementation Method 4
a transmitting coil...configured to send the received alternating current power signal to the transmitting coil
Data Source
AI summary
A terminal device and a method for controlling the terminal device are provided. The terminal device includes a display screen, a housing, a middle frame and a transmitting circuit. The transmitting circuit is disposed on a side of the middle frame and faces the housing. The transmitting circuit includes a matching network and a transmitting coil connected to the matching network. The matching network is configured to perform impedance matching on a received alternating current power signal and send the received alternating current power signal to the transmitting coil. The matching network includes a parallel resonant capacitor connected in parallel to the transmitting coil. The transmitting circuit further includes a resistance switching circuit connected in series to the parallel resonant capacitor.