Wireless Charging Receiver Variable Resonant Frequency
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Solution Overview
Problem
Existing wireless charging technologies lack the ability to dynamically adjust power output based on the charge scenario of devices, potentially leading to inefficient charging and the risk of overcharging.
Innovation Solution
A wireless charging system that includes a wireless receiver with an adjustable resonant frequency, allowing it to switch between different charge scenarios (rapid, trickle, maintenance, and no charge) by coupling different capacitors to the receiver coil, thereby varying the current and power supplied to the device based on its battery status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless charging uses fixed resonant frequency, then system simplicity is maintained, but charging efficiency and adaptability to different charge scenarios deteriorate
Solution Approach 1:
The patent implements dynamic resonant frequency adjustment by switching between different capacitor values (C1, C2, C3) connected to the receiver coil through control switches. This allows the resonant frequency to be dynamically changed based on charge scenarios (rapid charging, trickle charging, maintenance charging), resolving the contradiction between adaptability and complexity by making the system configurable rather than fixed.
Solution Approach 2:
The patent changes the electrical parameters of the resonant circuit by switching between different capacitor values. The resonant frequency is determined by the formula f = 1/(2π√(LC)), where L is the inductance of the receiver coil and C is the capacitance. By changing C between C1, C2, and C3, the system achieves different resonant frequencies suitable for different charging scenarios, improving adaptability without requiring complete circuit redesign.
2Productivity
If wireless charging system provides high power output, then rapid charging is achieved, but risk of overcharging and energy waste increases
Solution Approach 1:
The patent implements periodic assessment of charging status by monitoring battery voltage and current, and periodically switching between different resonant frequency configurations. The system transitions from high-power rapid charging mode (using C1 for higher frequency) to lower-power maintenance mode (using C2 or C3 for lower frequencies) when charging thresholds are reached, preventing overcharging and energy waste while maintaining high productivity during the charging phase.
Solution Approach 2:
The patent incorporates feedback mechanisms through voltage detection circuits and current detection circuits that continuously monitor the charging status. Based on the feedback from these circuits, the control logic determines when to switch between different capacitor configurations, thereby adjusting the resonant frequency and power output level. This feedback-controlled approach ensures rapid charging when needed while preventing overcharging and energy waste.
3Adaptability or versatility
If wireless receiver uses multiple capacitor configurations, then charging scenario flexibility improves, but circuit complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the capacitance function into multiple discrete capacitor components (C1, C2, C3) that can be independently manufactured and tested. Each capacitor is designed with specific voltage and current ratings suitable for different charging scenarios. This segmentation allows for modular assembly and simplifies quality control during manufacturing, as each component can be produced using standard capacitor manufacturing processes rather than requiring custom multi-configurable circuits.
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 system efficiently adjusts power output to match the device's charging needs, ensuring rapid charging when needed, slow charging when fully charged, and preventing overcharging, while maintaining a constant voltage across scenarios.
Implementation Method 1
a receiver coil configured to receive energy from a transmitter coil
Implementation Method 2
a resonant frequency associated with the wireless receiver is a function of a configuration of capacitors within the array
Data Source
AI summary
At least one of a system or a method for wirelessly charging a device is provided. A wireless receiver is configured to communicate with a device to be charged to determine a desired charge scenario indicative of power to be supplied to the device. Based upon the desired charge scenario, a resonant frequency of the wireless receiver is set. The resonant frequency, in combination with energy transferred from a wireless transmitter, is configured to induce a current in the wireless receiver. Power is supplied to the device based upon the current induced in the wireless receiver.