Speaker Vibration Displacement Detection via Capacitor Structure
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Solution Overview
Problem
Current speaker systems face challenges in accurately detecting vibration displacement, particularly at low frequencies, leading to potential mechanical damage due to excessive displacement and distortion, as existing solutions rely on hypothetical models and cannot account for deviations in physical parameters of individual speakers.
Innovation Solution
A capacitor structure is designed with a movable pole plate and a fixed pole plate to detect changes in capacitance, allowing for real-time calculation of actual displacement, which can trigger power reduction when thresholds are exceeded, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If intelligent power amplification control unit uses hypothetical theoretical model to deduce actual displacement, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces the mechanical/deductive displacement detection method with an electrical measurement system. A capacitor is formed with the voice coil as one electrode and a fixed electrode as the other, converting mechanical displacement into electrical capacitance changes that can be precisely measured and fed back for real-time power adjustment.
Solution Approach 2:
The patent introduces capacitance as an intermediary parameter between mechanical displacement and control signals. The changing distance between voice coil and fixed electrode creates capacitance variations that serve as an accurate intermediary indicator of displacement, enabling precise measurement without complex mechanical sensors.
2Manufacturing precision
If deduce actual displacement based on input information and physical parameters, then manufacturing precision requirements are reduced, but measurement precision deteriorates
Solution Approach 1:
The speaker system performs self-measurement of its own displacement through the capacitor effect. The voice coil and fixed electrode form a capacitor whose capacitance changes automatically reflect the actual displacement of the voice coil, enabling the system to self-monitor without external sensors or complex parameter matching.
Solution Approach 2:
The patent replaces parameter-based deduction with direct electrical measurement. Instead of calculating displacement from voltage, current, and physical parameters, the system directly measures capacitance changes that proportionally reflect actual displacement, eliminating the need for parameter consistency across manufactured units.
3Reliability
If reduce power when deduced displacement exceeds threshold, then reliability is improved, but loss of information occurs
Solution Approach 1:
The patent implements a feedback control system where capacitance changes are continuously measured and fed back to the power amplification control unit. When the capacitance indicates that displacement approaches the threshold, the system automatically adjusts power in real-time, ensuring reliable operation while maintaining accurate displacement information through continuous electrical measurement.
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 enables precise and real-time detection of vibration displacement, reducing the risk of mechanical damage and distortion by adjusting power input based on actual displacement, improving the reliability and safety of speaker systems.
Implementation Method 1
a fixed pole plate provided under the vibration system and opposite to the movable pole plate, the movable pole plate and the fixed pole plate constituting a capacitor
Data Source
AI summary
Disclosed is a structure for detecting the vibration displacement of a speaker, including: a vibration system having a movable pole plate; a magnetic circuit system; and a fixed pole plate provided under the vibration system and opposite to the movable pole plate, the movable pole plate and the fixed pole plate constituting a capacitor. Also disclosed is an acoustoelectric inter-conversion dual-effect device, further including an impedance transformer connected to the capacitor and including a field effect transistor and a diode. In the present invention, a movable pole plate of a capacitor is provided on a vibration system and a fixed pole plate is provided under the vibration system and fixed in position. When the vibration system vibrates, the change in capacitance is detected to calculate the actual displacement of the vibration system, which can reduce the power of the speaker device when the actual displacement of the vibration system exceeds a safety threshold. For an electronic device adopting such a speaker structure, the displacement of the vibration system of a speaker product can be detected in real time at the system end of the electronic device.