Erroneous Wiring Inspection With AC Phase Detection
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Solution Overview
Problem
Existing erroneous wiring inspection devices face issues with false diagnoses due to current bypass, particularly in components with low DC resistance, requiring skill to interpret inspection results accurately.
Innovation Solution
An erroneous wiring inspection device with a first and second probe, AC generating circuit, voltage and current measuring circuits, and reporting circuits that utilize different reporting methods (sound and visible light) based on resistance and phase difference to accurately identify conduction or current bypass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an oscillation circuit is used to generate buzzer sound for detecting low resistance components, then current bypass detection is improved, but the inspection result interpretation becomes complex and requires skilled judgment
Solution Approach 1:
The inspection results are segmented into distinct categories (conduction, current bypass, non-conduction) with dedicated indication methods for each. The buzzer unit handles conduction detection while the LED unit handles current bypass detection, separating the indication functions to simplify interpretation.
Solution Approach 2:
The patent uses visual color changes through LED units (light emission) to indicate current bypass, complementing the auditory buzzer signals. This provides distinct sensory channels for different inspection results, making interpretation easier without requiring skilled judgment.
2Ease of operation
If multiple reporting methods (buzzer and LED) are used to indicate different inspection results, then result interpretation is simplified, but device complexity increases
Solution Approach 1:
The reporting function is extracted into separate dedicated units: a buzzer unit for conduction indication and an LED unit for current bypass indication. This modular extraction simplifies the control logic while providing clear, distinct indications for different inspection outcomes.
Solution Approach 2:
The control unit acts as an intermediary that receives inspection data and selectively activates appropriate indication units. It mediates between the measurement circuits and the reporting units, determining which indication method to use based on the inspection results.
3Measurement precision
If AC signal frequency is alternated to improve current bypass detection accuracy, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The AC signal frequency is periodically alternated between a first frequency and a second frequency during the inspection process. This periodic frequency variation enables more accurate detection of current bypass through components like coils and capacitors while maintaining reasonable inspection time through automated control.
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
Improves accuracy in detecting current bypass through components like coils and capacitors by alternating AC signal frequencies and using distinct reporting modes, allowing users to recognize results without visual distraction.
Implementation Method 1
The AC generating circuit generates an AC signal to be applied to the first probe
Implementation Method 2
The voltage measuring circuit measures voltage between the first probe and the second probe
Implementation Method 3
The current measuring circuit measures current flowing through the second probe
Implementation Method 4
determines a resistance value between the first measurement point and the second measurement point, and whether or not there is a phase difference between the voltage measured by the voltage measuring circuit and the current measured by the current measuring circuit
Data Source
AI summary
There is provided an erroneous wiring inspection device that can prevent false diagnoses due to current bypass. The erroneous wiring inspection device determines a resistance value and whether or not there is a phase difference based on the measured voltage and the measured current, while an AC generating circuit applies an AC signa. If the resistance value is equal to or greater than a predetermined value, the device stops a first reporting circuit and a second reporting circuit from driving. If the resistance value is less than the predetermined value and there is no phase difference, the device reports the inspection result of the erroneous wiring in the first manner by driving the first reporting circuit without driving the second reporting circuit. If the resistance value is less than the predetermined value and there is the phase difference, the device reports the inspection result of the erroneous wiring in the second manner by driving the second reporting circuit without driving the first reporting circuit. The AC generating circuit periodically alternates a frequency of the AC signal between a first frequency and a second frequency.