Earphone Plug Impedance Detection Apparatus
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Solution Overview
Problem
Existing methods for detecting equivalent impedance in earphone plugs are inefficient and prone to measurement errors due to manual operation, leading to inaccurate results in corrosion resistance analysis.
Innovation Solution
An impedance detection apparatus comprising an earphone jack unit, voltage sampling unit, contact selection unit, processing unit, and display unit that automatically calculates and displays the impedance value between the ground wire contact and other contacts of an earphone plug, reducing human error and improving detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual operation using a multimeter is used to measure equivalent impedance, then the measurement process is simple and requires minimal equipment, but the detection efficiency is low and measurement errors are large
Solution Approach 1:
The patent replaces the manual mechanical operation of using a multimeter with an automated electronic detection system. The impedance detection apparatus uses electronic components including a power supply, voltage sampling circuit, selection switches, and processing unit to automatically perform impedance measurements, eliminating manual intervention and improving both efficiency and accuracy.
Solution Approach 2:
The detection system performs self-measurement by automatically connecting to different contacts through selection switches, applying test voltages, sampling voltage drops, and calculating impedance values without requiring operator intervention. The system autonomously completes the entire measurement process for multiple contacts.
2Reliability
If manual operation is used for impedance detection, then the device complexity is low, but the detection accuracy and reliability are poor due to improper operations
Solution Approach 1:
The detection apparatus is divided into distinct functional modules: a power supply unit providing test voltage, a voltage sampling unit measuring voltage drops, a contact selection unit with switches for different contacts, and a processing unit for calculation. This modular segmentation allows each component to perform its specific function reliably while maintaining overall system manageability.
Solution Approach 2:
The patent introduces an in-phase proportional amplifier circuit as an intermediary between the voltage sampling unit and processing unit. This amplifier circuit stabilizes and conditions the voltage signals before they reach the processing unit, improving measurement reliability by eliminating signal instability and noise issues that would affect direct measurements.
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
The apparatus enables accurate and efficient detection of impedance values, enhancing measurement accuracy and batch detection capabilities by automating the process and reducing errors.
Implementation Method 1
a processing unit configured to calculate an impedance value of an equivalent impedance between the selected connection contact and the jack end ground wire contact according to a voltage of the contact access point with respect to the jack end ground wire contact
Data Source
AI summary
An impedance detection apparatus for an earphone plug, including: an earphone jack unit; a voltage sampling unit comprising a first resistor connected between a positive terminal of a power supply and a contact access point, a negative terminal of the power supply being in contact with the jack end ground wire contact; a contact selection unit comprising selection switches arranged in one-to-one correspondence with selected jack end connection contacts, each of the selection switches being connected between a corresponding connection contact and the contact access point; a processing unit configured to calculate an impedance value of an equivalent impedance between the selected connection contact and the jack end ground wire contact according to the voltage of the contact access point with respect to the jack end ground wire contact; and a display unit.