Wireless Power Transfer for Wall-Mounted and Wearable Audio Playback

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Solution Overview

Problem

Audio playback devices mounted to walls struggle with limited bass output and unsightly power cables, while wearable devices face repairability and waste generation issues, and idle devices consume unnecessary energy.

Innovation Solution

Implement onboard energy storage in mountable playback devices for wireless or cable power transfer, energy harvesting for idle devices, and wireless power transfer for wearables to extend battery life and facilitate repairability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If wall-mounted playback devices are used, then bass output is improved, but visible power cables become unsightly

Engineering Contradiction:

Improvevisible power cablesVSAvoidwireless power transfer

Core Design Contradiction:

Object-generated harmful factorsVSEase of operation

Solution Approach 1:

The patent replaces the mechanical cable connection system with a wireless power transfer system using electromagnetic fields. The wall-mounted playback device includes a power receiver that wirelessly receives power from a power transmitter, eliminating the need for visible power cables while maintaining continuous power supply for improved bass output.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary wireless power transfer system between the power source and the playback device. This intermediary system consists of a power transmitter and power receiver that enable indirect power transmission through electromagnetic fields, removing the need for direct cable connections while ensuring reliable power delivery.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If wearable audio devices are made non-repairable, then device complexity is reduced, but waste generation increases

Engineering Contradiction:

Improvedevice complexityVSAvoidwaste generation

Core Design Contradiction:

Ease of manufactureVSLoss of substance

Solution Approach 1:

The patent divides the wearable audio device into separable modules, including a battery module that can be independently replaced. This segmentation allows the device to maintain simplicity in assembly while enabling repairability through module replacement, reducing waste without significantly increasing manufacturing complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a battery replacement system where the battery module can be easily removed and replaced by the user. This allows the main device body to be retained and reused while only the battery component is discarded and replaced, significantly reducing waste generation while maintaining relatively simple device construction.

Inventive Principle:

Principle #34Discarding and recovering

3Reliability

If idle playback devices remain powered on, then device readiness is maintained, but energy consumption increases

Engineering Contradiction:

Improvedevice readinessVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring and conditional power management where the playback device checks for active playback requests at intervals. When no playback is requested, the device transitions to a lower power state while maintaining the ability to quickly resume playback when needed, thus reducing energy consumption while preserving essential device readiness.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent introduces dynamic power management that adjusts the device's operational state based on actual usage conditions. The device can dynamically switch between full power, standby, and sleep modes, optimizing the balance between readiness and energy consumption by adapting its power state to current playback requirements.

Inventive Principle:

Principle #15Dynamics

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

Enhances bass output, reduces visible power cables, extends battery life in wearables, and optimizes energy use in idle devices, thereby improving user experience and environmental sustainability.

Implementation Method 1

an energy storage component configured to store energy

Methodology Applied

Scientific EffectEnergy storage: Battery (electricity)

Implementation Method 2

a wireless power transmitter configured to transmit energy to the audio playback device

Methodology Applied

Scientific EffectWireless power transfer: Electromagnetic Induction

Implementation Method 3

a power receiver configured to receive energy from the wireless power transmitter

Methodology Applied

Scientific EffectPower reception: Electromagnetic Induction

Data Source

PatentUS20250321625A1Power management for audio playback devices

Publication Date: 2025.10.16 SONOS INC

AI summary

Disclosed herein are systems and methods for power transmission between playback devices, systems and methods for energy harvesting and distribution for audio playback devices, and systems and methods for wirelessly powering wearable audio playback devices.