Wireless Energy Transfer Module with Phase-Synchronized Coils
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Solution Overview
Problem
Existing energy transfer systems for mobile devices, such as handheld power tools, require precise positioning and alignment for wireless charging, leading to undesirable radiated interference and inefficiencies, limiting the ease of use and permissible power transfer.
Innovation Solution
An energy transfer module with at least two transmitting coils, where the currents in the coils are synchronized to maintain a relative phase angle of no more than 45°, preferably 0°, to increase the spatial energy transfer area, reduce interference, and enhance efficiency by minimizing power losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If precise positioning and alignment are required for wireless energy transfer, then energy transfer efficiency is improved, but ease of operation deteriorates
Solution Approach 1:
The transmitting side is divided into multiple independent transmitting coils (first transmitting coil, second transmitting coil), each capable of wireless energy transfer. This segmentation allows the system to cover a larger spatial area and provides redundancy, so that if one coil is misaligned, others can compensate, thereby maintaining energy transfer efficiency while improving ease of operation.
Solution Approach 2:
Multiple transmitting coils are combined to work simultaneously or alternately for energy transfer. By merging the functionality of multiple coils, the system creates a composite energy transfer field that is more tolerant to positioning variations, resolving the contradiction between maintaining efficiency and improving ease of use.
2Object-generated harmful factors
If precise alignment is required for energy transfer, then radiated interference is reduced, but device complexity increases
Solution Approach 1:
The system dynamically controls the phase angles of multiple transmitting coils to maintain optimal interference patterns. By dynamically adjusting phase angles (keeping relative phase angle within 45°, preferably within 15°), the system adaptively reduces radiated interference while managing complexity through intelligent control rather than fixed complex hardware.
Solution Approach 2:
The system changes the operational parameters (phase angles) of the transmitting coils to optimize performance. By controlling phase angles to be within specific ranges, the system reduces radiated interference through parameter optimization rather than through complex structural design.
3Ease of operation
If multiple transmitting coils are used to increase spatial energy transfer area, then ease of operation is improved, but radiated interference increases
Solution Approach 1:
The system uses dynamic phase angle control to manage interference from multiple transmitting coils. By continuously adjusting the phase angles of individual coils, the system maintains constructive interference patterns that reduce overall radiated interference while preserving the extended spatial coverage provided by multiple coils.
Solution Approach 2:
The system optimizes the operational parameters (phase angles) of multiple transmitting coils to minimize radiated interference. By constraining relative phase angles within 45° (preferably 15°), the system achieves parameter optimization that reduces interference while maintaining the benefits of multiple coils for improved positioning tolerance.
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 allows for high-power energy transfer with reduced alignment requirements, increased ease of use, and improved efficiency by minimizing radiated interference and power losses, making it suitable for applications like building construction and civil engineering.
Implementation Method 1
an energy transfer module for transferring energy to a mobile device, in particular a handheld power tool, wherein the energy is transferred wirelessly, comprising at least a first and a second transmitting coil
Data Source
AI summary
An energy transfer module for transferring energy to a mobile device, in particular a handheld power tool, wherein the energy is transferred wirelessly, including at least a first and a second transmitting coil. The first transmitting coil can be operated with a first alternating current and the second transmitting coil can be operated with a second alternating current, wherein the energy transfer module is configured so that, at least during an energy transfer phase of the energy transfer module, the absolute value of the relative phase angle (beta) of the currents flowing in the first and second transmitting coils is not more than 45° or the relative phase angle (beta) is minimized. A transmitting unit, to an energy transfer system and to a method for operating at least one of the aforementioned apparatuses.