Wireless Charging Circuit Power-Path Switching for NFC Range
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Solution Overview
Problem
Existing wireless communication charging systems face issues with shortened communication distance and degraded communication quality due to energy consumption by the control circuit during near field communication, and inefficient power utilization during charging.
Innovation Solution
A wireless communication charging circuit system that includes a power reception coil, a power storage device, a charging circuit, a voltage conversion circuit, a communication antenna, and a control circuit with a microcontroller, which switches between power sources to optimize power usage during communication and charging periods, ensuring power is supplied from the power storage device during communication and from the power reception circuit during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control circuit operates using received power during near field communication, then the communication function is enabled, but the communication distance is shortened and communication quality is degraded
Solution Approach 1:
The patent implements dynamic power source switching where the control circuit can operate from either the power storage device or the power reception circuit depending on the operational mode. During communication mode, the control circuit operates from the power storage device to preserve received power for charging, while during charging mode, it switches to the power reception circuit. This dynamic adaptation resolves the contradiction by adjusting the power supply configuration based on real-time operational requirements.
Solution Approach 2:
The patent changes the power supply parameter (power source selection) based on operational mode. The power supply configuration is dynamically adjusted between two states: (1) power storage device during communication to ensure quality, and (2) power reception circuit during charging to maximize received power utilization. This parameter change resolves the contradiction by optimizing power supply for each specific operational context.
2Reliability
If power is supplied to the control circuit from the rechargeable battery, then communication characteristics are improved, but charging time increases and received power is not fully utilized
Solution Approach 1:
The patent implements dynamic power source switching where the control circuit can operate from either the power storage device or the power reception circuit depending on the operational mode. During communication mode, the control circuit operates from the power storage device to preserve received power for charging, while during charging mode, it switches to the power reception circuit. This dynamic adaptation resolves the contradiction by adjusting the power supply configuration based on real-time operational requirements.
Solution Approach 2:
The patent employs periodic switching between different power supply configurations corresponding to different operational modes. The system alternates between communication mode (using power storage device) and charging mode (using power reception circuit), optimizing performance for each period. This periodic action resolves the contradiction by ensuring optimal power utilization for each operational phase.
3Ease of operation
If the control circuit consumes energy from the alternating magnetic field during near field communication, then the communication function is enabled, but communication distance is shortened
Solution Approach 1:
The patent extracts the control circuit's power consumption from the received power path during communication mode by supplying it from the power storage device instead. This separation removes the harmful effect of control circuit power consumption from the communication energy budget, allowing the full received power to be dedicated to maintaining communication field strength and distance, while the control circuit draws its energy independently from the stored power source.
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 configuration effectively suppresses shortening of communication distance and degradation of communication quality during communication periods while optimizing power utilization and reducing charging time by minimizing power consumption during the charging period.
Implementation Method 1
a power reception coil that magnetically couples to a transmission antenna or a wireless power transmission coil of a reader-writer device
Data Source
AI summary
An electronic card of a wireless communication charging circuit system includes a power reception coil, a power reception circuit, a power storage device, a charging circuit, a voltage conversion circuit that is connected to the power storage device and generates a prescribed power supply voltage, a communication antenna , a communication circuit that performs communication using output power of the voltage conversion circuit, and a control circuit that controls the voltage conversion circuit and the charging circuit. The control circuit sets a power path in a communication period so that the communication circuit performs communication and power used by a microcontroller is supplied from the power storage device, and sets a power path in a charging period so that a reader-writer device, which was made to recognize the communication circuit, generates a magnetic field and power used by the microcontroller is supplied from the power reception circuit.