Resonant Coil Switching for Reliable Mobile Wireless Power Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power transmission systems face challenges in efficiently supplying power to movable power receiving devices due to variations in the size and shape of the power reception coil and its relative position to the power transmission coil, leading to small changes in magnetic flux and potential resonance issues.
Innovation Solution
The power transmission device incorporates an edge coil unit with an edge resonance circuit and an adjacent coil unit, both equipped with current switching units and controlled by dedicated transmission control units. These units switch the power supply on and off based on transmission request signals, ensuring reliable power transmission even when the power reception coil changes from a non-facing to a facing state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a saturable reactor is placed between the high-frequency power source and each power transmission coil to automatically adjust impedance based on facing state, then power supply efficiency is improved, but device complexity increases due to additional components and control mechanisms
Solution Approach 1:
The system performs preliminary detection of the facing state between transmission and reception coils before initiating power transmission. The control unit determines whether the coils are in a facing state based on detected information, and only then switches the power transmission coil to the on-state. This preliminary action avoids the need for complex real-time impedance adjustment mechanisms like saturable reactors, while still achieving efficient power transfer when needed.
Solution Approach 2:
The system dynamically switches the power transmission coil between on-state and off-state based on the detected facing state. The control unit changes the operational state of the transmission coil according to real-time detection results, enabling adaptive power transmission without requiring complex impedance adjustment components. This dynamic switching approach simplifies the device structure while maintaining power supply efficiency.
2Reliability
If the power transmission coil is continuously supplied with power to ensure immediate transmission when needed, then reliability of power transmission is improved, but energy consumption increases during non-facing states
Solution Approach 1:
The system employs periodic detection of the facing state between transmission and reception coils. The control unit periodically determines whether the coils are in a facing state based on detected information and switches the power transmission coil between on-state and off-state accordingly. This periodic action ensures reliable power transmission when needed while minimizing energy consumption during non-facing states, avoiding continuous power supply.
Solution Approach 2:
The system uses a feedback mechanism where the control unit determines the facing state based on detected information and adjusts the power transmission coil state accordingly. When the reception coil is detected to be in a facing state, the control unit switches the transmission coil to the on-state to enable power transmission. When not in a facing state, the transmission coil is switched to the off-state to save energy. This feedback-based control ensures both reliability and energy efficiency.
3Speed
If the power transmission coil is quickly switched to on-state when the power reception coil enters facing state, then responsiveness is improved, but power supply interruptions may occur during state transition
Solution Approach 1:
The system performs preliminary detection of the facing state before initiating power transmission. The control unit determines whether the coils are in a facing state based on detected information, and only then switches the power transmission coil to the on-state. This preliminary detection approach ensures quick responsiveness when the facing state is achieved while avoiding power supply interruptions by not switching during transitional states.
4Measurement precision
If multiple control units are used to control different coil units, then control precision is improved, but device complexity increases
Solution Approach 1:
The system divides the power transmission device into multiple independent coil units, each with its own control unit. The edge coil unit includes an edge resonance circuit and an edge current switching unit controlled by an edge transmission control unit, while the adjacent coil unit includes an adjacent resonance circuit and an adjacent current switching unit controlled by an adjacent transmission control unit. This segmentation allows each control unit to independently and precisely control its associated coil unit based on local detection information, achieving high control precision without requiring a single complex centralized control system.
Solution Approach 2:
Each coil unit is designed with universal functionality, including resonance circuits and current switching units that can operate independently. The edge coil unit and adjacent coil unit both have similar structural components and control mechanisms, allowing them to function as independent power transmission units. This multi-functionality design enables precise control of each unit while maintaining structural simplicity and reducing overall system 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 effectively prevents power supply interruptions by ensuring that the power transmission device can initiate power transmission reliably when the power reception coil enters a facing state, thereby maintaining efficient wireless power transfer.
Implementation Method 1
an edge resonance circuit, the edge resonance circuit including an edge coil and an edge resonance capacitor for parallel resonance of the edge coil
Implementation Method 2
A wireless power transmitting system with a plurality of power transmission coils connected in parallel to a high-frequency power source and a power reception coil mounted on a mobile device is known
Data Source
AI summary
A power transmission device for wireless power supply to a mobile power receiving device has an edge coil unit that includes an edge resonance circuit, the edge resonance circuit including an edge coil and an edge resonance capacitors; an edge current switching unit; an edge transmission request signal receiving unit; an edge transmission control unit; an adjacent coil unit that adjacent to the edge coil unit and includes an adjacent resonance circuit; the adjacent resonance circuit including an adjacent coil and an adjacent resonance capacitor; and an adjacent current switching unit for switching on and off state of the power supply from the power source to the adjacent resonance circuit; and an adjacent transmission control unit that controls the on and off state of the power supply from the power source to the adjacent resonance circuit using the adjacent current switching unit.