Wireless Charging Circuit Noise Reduction via Dynamic Voltage Control

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Solution Overview

Problem

Annoying noise occurs during wireless charging due to capacitor shaking in wireless charging pads, and existing noise reduction methods are either ineffective or prolong charging time.

Innovation Solution

An electronic device with a microphone, wireless charging circuit, and wireless communication circuit that adjusts charging voltage based on ambient sound and user sleep information from a wearable device to reduce noise and optimize charging efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If wireless charging is performed using a wireless charging pad, then charging convenience is improved, but annoying noise is generated due to capacitor shaking

Engineering Contradiction:

Improvecharging convenienceVSAvoidnoise

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent adjusts the charging voltage parameter dynamically based on ambient sound levels and user sleep state. When noise is detected or user is sleeping, the system lowers the charging voltage to reduce capacitor shaking and noise generation, while maintaining charging functionality. This resolves the contradiction by changing the operational parameter rather than eliminating the charging function.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamic adjustment of charging voltage based on real-time environmental conditions and user state. The system transitions from static high-voltage charging to adaptive voltage control, modifying charging parameters according to ambient noise levels and sleep detection, thereby reducing noise while preserving charging convenience.

Inventive Principle:

Principle #15Dynamics

2Object-generated harmful factors

If special products (e.g., Tantal, T-HMC) are used to reduce noise, then noise reduction effect is improved, but product cost increases

Engineering Contradiction:

ImprovenoiseVSAvoidproduct cost

Core Design Contradiction:

Object-generated harmful factorsVSEase of manufacture

Solution Approach 1:

The patent replaces expensive special-purpose capacitors (Tantal, T-HMC) with conventional capacitors combined with software-based voltage control. The noise reduction is achieved through intelligent parameter adjustment rather than expensive hardware components, significantly reducing product cost while maintaining noise reduction effectiveness.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes hardware-based noise reduction (special capacitors) with a software/control-based solution (voltage adjustment algorithm). This replaces the mechanical/electrical component approach with an intelligent control system, reducing manufacturing costs while achieving the same noise reduction goal.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Object-generated harmful factors

If wireless charging speed is reduced for a fixed time to reduce noise, then noise is reduced, but charging time increases

Engineering Contradiction:

ImprovenoiseVSAvoidcharging time

Core Design Contradiction:

Object-generated harmful factorsVSLoss of time

Solution Approach 1:

The patent implements periodic monitoring of ambient sound and user sleep state, adjusting charging voltage dynamically based on current conditions. Rather than fixed-time speed reduction, the system continuously adapts charging parameters, reducing noise only when necessary and maintaining high charging speed when appropriate, thus avoiding unnecessary charging time extension.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent employs feedback mechanisms by continuously monitoring ambient sound levels and user sleep state, then adjusting charging voltage accordingly. This closed-loop control ensures noise reduction is applied only when needed, preventing unnecessary charging time extension while effectively reducing noise during problematic periods.

Inventive Principle:

Principle #23Feedback

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

Effectively reduces annoying noise during wireless charging while maintaining consistent charging power and performance by adjusting charging voltage and current according to the user's environment.

Implementation Method 1

wireless charging circuit

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

microphone

Methodology Applied

Scientific EffectAcoustic detection: Sound

Data Source

PatentUS20230131461A1Electronic device comprising wireless charging circuit

Publication Date: 2023.04.27 SAMSUNG ELECTRONICS CO LTD

AI summary

An electronic device include a microphone, a wireless charging circuit, a wireless communication circuit, and processor electrically connected with the microphone, the wireless charging circuit, and the wireless communication circuit. The processor acquires first information corresponding to an ambient sound of the electronic device through the microphone, acquires second information related to a sleep of a user from a wearable device through the wireless communication circuit, the wearable device being connected with the electronic device through wireless communication, and, when wireless charging is performed by using the wireless charging circuit, adjusts a charging voltage of the wireless charging, based on at least one of the first information or the second information.