Shielded Wireless Power Receiver with Segmented Interference Control
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Solution Overview
Problem
Existing contactless power transfer systems face issues with increased device size due to large dead spaces around coils and noisy outputs from devices affected by electromagnetic fields, particularly when wiring is exposed to these fields.
Innovation Solution
The implementation of shielding walls and casings around power receiving and transmitting devices to contain electromagnetic fields and protect wiring, with strategic hole placement to minimize electromagnetic interference and device size, while maintaining efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rectifier is disposed inside the shield to reduce device size, then the device size is reduced, but the wiring is exposed to electromagnetic fields causing noisy output
Solution Approach 1:
The shield is divided into multiple regions with different functions: a first region containing the power receiving coil, a second region containing the rectifier, and a third region serving as a transition zone. The wiring passes through the third region which is positioned between the first and second regions, allowing the wiring to be protected from electromagnetic fields while maintaining compact device size.
Solution Approach 2:
The third region acts as an intermediary zone between the electromagnetic field source (power receiving coil) and the sensitive component (wiring). This transition region shields the wiring from direct exposure to electromagnetic fields while allowing the device to maintain a compact structure with the rectifier disposed inside the shield.
2Device complexity
If the power transmitting coil is provided without surrounding devices to simplify structure, then the structure is simplified, but the device size increases due to large dead space
Solution Approach 1:
Multiple functional components (power transmitting coil, electromagnetic induction coil, rectifier, and control devices) are merged and disposed within a single shield structure. This consolidation eliminates large dead spaces and reduces overall device size while maintaining structural simplicity through the unified shield enclosure.
Solution Approach 2:
The electromagnetic induction coil and rectifier are nested within the shield that also contains the power transmitting coil. This nested arrangement allows multiple components to share the same spatial envelope, reducing the overall device volume while keeping each component's structure relatively simple.
3Volume of moving object
If devices are disposed inside the shield to reduce size, then device size is reduced, but electromagnetic fields affect the devices causing noisy output
Solution Approach 1:
Different regions within the shield are assigned different quality characteristics: the first region accommodates the power receiving coil where electromagnetic fields are generated, the third region provides electromagnetic shielding for the wiring, and the second region houses the rectifier. This localized quality approach ensures that sensitive components are protected while maintaining compact device size.
Solution Approach 2:
The shield is segmented into multiple functional regions with the wiring passing through a dedicated third region that is positioned to avoid exposure to strong electromagnetic fields. This segmentation allows the device to be compact while maintaining output quality by protecting sensitive wiring from electromagnetic interference.
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 reduces electromagnetic interference, minimizes device size, and prevents noisy outputs, resulting in more efficient and compact power transfer systems with reduced disturbance to connected wiring.
Implementation Method 1
electric power is transmitted from the power transmitting coil to the power receiving coil through electromagnetic induction
Implementation Method 2
a first shielding wall surrounding the first coil and defining a region in which an electromagnetic field formed around the power receiving unit is radiated
Data Source
AI summary
A power receiving device includes: a power receiving unit receiving electric power from an external power transmitting unit contactlessly; a first coil; a first shielding wall surrounding the first coil; a first device; a first shielding casing having the first device accommodated therein, the first shielding casing being also disposed inside the first shielding wall; and a first wiring connected to the first device and extending from inside the first shielding casing to outside the first shielding casing, and also pulled outside the first shielding wall, the first shielding casing having an external surface including a first opposite portion closer to the first shielding wall than the first coil, the first shielding wall having a first region opposite to the first opposite portion, the first region having a first hole, the first wiring being pulled outside the first shielding wall through the first hole.