Wireless Power Transmitter With Segmented Coils For Frequency Control
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Solution Overview
Problem
Wireless power transmission systems face inefficiencies due to deviations in distance and orientation between transmitters and receivers, leading to increased current losses and decreased efficiency, as well as frequency shifts that can exceed acceptable operational ranges.
Innovation Solution
A wireless power transmitter with an inverter, impedance circuit, inductance circuit, and switch circuit, utilizing multiple transmission coils with different geometries and configurations to maintain resonance frequency within a prescribed range, allowing for adaptive frequency adjustment and optimal magnetic coupling, thereby enhancing efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single transmission coil is used in the wireless power transmitter, then the device complexity is reduced, but the power transmission efficiency decreases due to frequency shifts caused by deviations in distance and orientation between transmitter and receiver
Solution Approach 1:
The transmission coil is divided into multiple independent coil segments that can be selectively connected to the impedance circuit. Each coil segment has different geometric parameters (turns, diameter, spacing) that correspond to different resonance frequencies. The segmentation allows the system to switch between different coil configurations to maintain optimal resonance frequency despite variations in transmission distance and orientation, thereby preventing efficiency loss.
Solution Approach 2:
The system dynamically switches between different coil segments based on real-time transmission conditions. The controller monitors transmission parameters and actively selects which coil segment to connect to the impedance circuit, making the system adaptive to changing distance and orientation conditions. This dynamic reconfiguration maintains optimal resonance frequency and prevents efficiency degradation.
2Adaptability or versatility
If multiple transmission coils with different geometries are used, then the adaptability to different distances and orientations is improved, but the device complexity increases
Solution Approach 1:
Instead of using multiple complete transmission coils, the system segments a single transmission coil into multiple independent coil segments. Each segment can be independently connected to the impedance circuit through the switch circuit. This segmentation provides geometric diversity (different resonance frequencies) without requiring multiple full coils, thereby reducing overall device complexity while maintaining adaptability.
Solution Approach 2:
The switch circuit serves multiple functions: it selects which coil segment is connected to the impedance circuit, it enables frequency tuning, and it optimizes power transmission efficiency. This multi-functionality reduces the need for separate control mechanisms, thereby reducing device complexity while achieving adaptability to different transmission conditions.
3Reliability
If the resonance frequency is allowed to shift freely with distance and orientation changes, then the ease of operation is improved, but the reliability decreases due to operation outside prescribed frequency ranges
Solution Approach 1:
The controller monitors transmission conditions and provides feedback to the switch circuit to select the appropriate coil segment. This feedback mechanism ensures that the resonance frequency remains within the prescribed range by automatically switching between coil segments based on real-time conditions. The system maintains reliability through frequency control while operating automatically without manual intervention, preserving ease of operation.
Solution Approach 2:
The system self-regulates its resonance frequency by automatically selecting the appropriate coil segment based on transmission conditions. The controller and switch circuit work autonomously to maintain optimal frequency without requiring external intervention. This self-service capability ensures both reliability (staying within frequency range) and ease of operation (automatic adjustment).
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 solution reduces current losses and maintains high efficiency across varying distances and orientations, ensuring operation within a specified frequency range and improving interoperability between different transmitters and receivers.
Implementation Method 1
The inverter can comprise an H-bridge circuit for transforming electric power of low frequency, e.g., DC power, to electric power of the abovementioned frequency range.
Implementation Method 2
The impedance circuit and the inductance circuit establish a resonance circuit.
Implementation Method 3
The inductance circuit can comprise further transmission coils. Each of the first and the second transmission coil and possibly further transmission coils can be a single-spiral type coil or a double-spiral type coil
Data Source
AI summary
A wireless power transmitter, a power transmission system and a method for driving a wireless power transmitter are disclosed. In an embodiment, a wireless power transmitter includes an inverter, an impedance circuit, an inductance circuit including a first transmission coil and a second transmission coil and a switch circuit, wherein the impedance circuit and the inductance circuit are configured to establish a resonance circuit, wherein the inverter is configured to provide AC power to the resonance circuit, and wherein the switch circuit is configured to couple the first transmission coil and/or the second transmission coil to the impedance circuit to change a resonance frequency of the resonance circuit and to keep a frequency of the AC power within a prescribed range.