Wireless Charging Noise Reduction via Dynamic Frequency Adjustment

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Solution Overview

Problem

Wireless charging of computing devices can induce noise in camera images due to the parameters of the wireless energy signal, particularly the frequency, which negatively impacts image quality during charging.

Innovation Solution

The computing device selectively adjusts the parameters of the wireless energy signal, such as frequency, in response to the activation state of the camera, to minimize noise in captured images without suspending charging, by communicating with the wireless charging device to adjust the power transfer and avoid frequencies that interfere with camera operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If wireless charging is performed at high power, then charging speed is improved, but image noise increases

Engineering Contradiction:

Improvecharging speedVSAvoidimage noise

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts wireless charging parameters (frequency, power level) based on real-time camera activity detection. When camera usage is detected, the system transitions to a lower-power charging mode with adjusted frequency to eliminate noise while maintaining charging functionality. This dynamic adaptation resolves the contradiction by making charging speed variable rather than fixed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes physical parameters of the wireless charging system (operating frequency, power transmission level) in response to camera activation. By shifting frequency away from resonant frequencies that cause noise and reducing power level during camera operation, the system eliminates image noise while preserving overall charging capability through parameter modulation.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If wireless charging parameters are adjusted to reduce noise, then image quality is improved, but charging efficiency may be reduced

Engineering Contradiction:

Improveimage qualityVSAvoidcharging efficiency

Core Design Contradiction:

Manufacturing precisionVSLoss of energy

Solution Approach 1:

The system implements periodic monitoring of camera activation state and adjusts charging parameters accordingly. During camera usage intervals, noise-reducing parameters are applied; during non-camera intervals, full-power charging resumes. This periodic switching maintains high overall charging efficiency while eliminating noise during critical image capture periods.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system applies noise-reducing parameter adjustments only partially - specifically during camera activation periods rather than continuously. This partial action approach maintains image quality when needed while preserving charging efficiency during normal operation, avoiding the excessive energy loss that would result from continuous low-power charging.

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If the camera is used during wireless charging, then device functionality is improved, but image quality deteriorates due to noise

Engineering Contradiction:

Improvedevice functionalityVSAvoidimage quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The system uses feedback from camera activation detection to automatically adjust wireless charging parameters. When the camera is activated, the system detects this state and responds by modifying charging frequency and power level to eliminate noise. This closed-loop feedback mechanism enables simultaneous camera usage and wireless charging with high image quality.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary detection of camera activation state before noise occurs and proactively adjusts charging parameters to prevent noise generation. By detecting camera usage intent and pre-adjusting frequency and power levels, the system eliminates noise before it can degrade image quality, enabling seamless camera operation during charging.

Inventive Principle:

Principle #10Preliminary action

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 approach reduces noise in images captured by the camera while the device is being wirelessly charged, enhancing image quality without disrupting the charging process, and can be implemented without modifying the wireless charging device.

Implementation Method 1

An example device may be wirelessly charged by transducing a wireless energy signal (e.g., an AC magnetic field) into an electrical signal

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11329507B2Camera with reduced image noise resulting from wireless charging

Publication Date: 2022.05.10 GOOGLE LLC

AI summary

An example method includes receiving, by a mobile computing device, electrical power via a wireless charging link between the mobile computing device and a wireless charging device; and responsive to an activation state of a camera of the mobile computing device, selectively adjusting, by the mobile computing device, one or more parameters of the wireless charging link, wherein wireless charging via the wireless charging link with the adjusted one or more parameters generates less noise in images captured by the camera while the mobile computing device receives electrical power via the wireless charging link than wireless charging with unadjusted one or more parameters.