Conductive Shields for Wireless Power Transfer Electric Field Interception
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Solution Overview
Problem
Existing wireless charging systems generate unintended voltages on receiver and transmitter coils, causing noise and inefficiencies in power transfer and potentially damaging sensitive components like touch-sensitive displays.
Innovation Solution
Incorporating transmitter and receiver shields made of conductive materials like NiV and silver, positioned between coils to intercept electric fields while allowing magnetic flux to pass through, thereby preventing detrimental voltages from being generated on the coils and grounding them to discharge any accumulated voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless power transfer is implemented using transmitter and receiver coils, then wireless charging capability is achieved, but unintended voltages are generated causing noise and inefficiencies
Solution Approach 1:
A transmitter shield and receiver shield are introduced as intermediary components between the transmitter coil and receiver coil. These shields intercept electric fields generated during wireless power transfer, preventing them from inducing unintended voltages on the coils while allowing magnetic flux to pass through for power transfer.
Solution Approach 2:
The shields convert the harmful electric fields into a beneficial configuration by providing a controlled path for electric field termination. The shields are grounded to discharge voltage, transforming the harmful unintended voltages into a controlled grounding path that protects the coils while maintaining wireless power transfer efficiency.
2Reliability
If shields are added to intercept electric fields, then detrimental voltages are prevented, but device complexity increases
Solution Approach 1:
The transmitter shield and receiver shield are implemented as thin conductive layers or films that can be integrated into the existing wireless charging device structure. These thin shields provide effective electric field interception without adding significant bulk or complexity to the device design.
Solution Approach 2:
The shields are positioned at specific locations and oriented in specific directions to optimize their effectiveness in intercepting electric fields while minimizing their impact on magnetic flux transmission. By carefully controlling the position, orientation, and material properties of the shields, effective protection is achieved with minimal added 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 the generation of detrimental voltages on both receiver and transmitter coils, reducing noise and improving the efficiency of wireless power transfer while protecting sensitive components from electrical disturbances.
Implementation Method 1
A transmitter coil disposed below the charging surface may produce a time-varying magnetic flux that induces a current in a corresponding receiving coil in the electronic device
Implementation Method 2
a transmitter shield and a receiver shield are implemented in a wireless charging system to intercept electric fields generated between the transmitter coil and the receiver coil during wireless power transfer
Implementation Method 3
allow the magnetic flux to pass through the transmitter shield; and a receiver shield positioned between the transmitter shield and the receiver coil to intercept some of the electric fields directed away from the receiver coil and allow the magnetic flux to pass through the receiver shield
Data Source
AI summary
Embodiments describe electromagnetic shielding for wireless charging systems. A wireless charging system includes a transmitter coil configured to generate a magnetic flux, a receiver coil positioned coaxial with the transmitter coil to receive the generated magnetic flux, where electrical interaction between the transmitter coil and the receiver coil generates electric fields, a transmitter shield positioned between the transmitter coil and the receiver coil to intercept some of the electric fields directed away from the transmitter coil and allow the magnetic flux to pass through the transmitter shield, and a receiver shield positioned between the transmitter shield and the receiver coil to intercept some of the electric fields directed away from the receiver coil and allow the magnetic flux to pass through the receiver shield.