Charging Circuit Audible Noise Mitigation via Frequency Monitoring
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Solution Overview
Problem
Existing charging circuits generate audible noise due to piezoelectric effects in components like capacitors, which can lead to user irritation and mechanical component failure, and current solutions such as reinforced connections or non-ferroelectric components are either size or cost prohibitive or inefficient.
Innovation Solution
A mitigation controller monitors the voltage frequency at the input node of the charging circuit and temporarily disables power supply when specific mitigation conditions are met, preventing audible output without the need for additional size or cost increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional charging circuits operate continuously, then charging efficiency is maintained, but audible noise is generated due to piezoelectric effects in components
Solution Approach 1:
The charging circuit operates in periodic cycles, alternating between active charging and temporary pause states. The controller monitors voltage frequency and temporarily disables power supply when the frequency matches the resonant frequency that causes audible noise, then resumes charging after the pause period. This periodic on-off action eliminates audible noise while maintaining overall charging efficiency.
2Object-generated harmful factors
If reinforced physical connection structures or dampening materials are used to reduce audible output, then audible noise is mitigated, but device size increases
Solution Approach 1:
The patent replaces mechanical solutions (reinforced connections, dampening materials) with an electrical control solution. The controller monitors voltage frequency and temporarily disables power supply when resonant frequency is detected, eliminating audible noise without adding any physical components or increasing device volume.
3Object-generated harmful factors
If non-ferroelectric components are used to eliminate audible output, then audible noise is reduced, but component cost increases
Solution Approach 1:
The patent changes the operating parameter (power supply state) rather than replacing components. By temporarily disabling power supply when voltage frequency matches resonant frequency, the existing ferroelectric components operate in a way that avoids generating audible noise, eliminating the need for expensive non-ferroelectric component replacements.
4Object-generated harmful factors
If voltage frequency is continuously monitored and power supply is temporarily disabled, then audible noise is eliminated, but charging time increases
Solution Approach 1:
The controller applies partial action by temporarily disabling power supply only for brief periods when resonant frequency is detected, rather than continuously. The monitoring is continuous but the corrective action (power disablement) is applied only partially and temporarily, minimizing impact on overall charging time while effectively eliminating audible noise.
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 or eliminates audible noise from charging circuits while maintaining efficient operation and minimizing component stress, without increasing device size or cost.
Implementation Method 1
a frequency of voltage being applied to one or more components in the charging circuit, which may lead to audible output (e.g., due to a piezoelectric effect of one or more components or the like)
Data Source
AI summary
Mitigation of audible output of one or more components in a charging circuit. A charging circuit may include a mitigation controller operative to monitor a frequency of voltage at an input of a charging circuit. The frequency of the voltage at the input node may result in a mitigation condition associated with audible output of one or more components of the charging circuit. In response to detection of the mitigation condition, the mitigation controller may temporarily disable the supply of power from charging circuit to a system load to mitigate (e.g., potentially eliminate) audible output of the circuit. During a time in which the charging circuit is disabled from supplying power to the system load, a battery of the device may supply power to the system load.