Socket Line Resistance Detection via Load Resistor Voltage Drop
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Solution Overview
Problem
Ordinary users cannot accurately determine the aging state of power lines, leading to potential fires due to increased resistance and heat generation, as existing impedance measurement tools are expensive and cumbersome for home use.
Innovation Solution
A detection device connected to a socket that includes electrical connection members, a load resistor, a switching member, a displaying module, and a control module, which calculates line resistance by detecting peak voltages and currents, providing a message on the displaying module about the line quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an impedance analyzer is used to measure low resistance value, then measurement precision is improved, but device complexity and portability deteriorate
Solution Approach 1:
The patent segments the measurement function into two parts: a simple portable detection device that interfaces with the power line through the socket, and a control module that performs the actual measurement calculations. This allows the measurement capability to be separated from bulky equipment, enabling portable use while maintaining measurement precision through the use of a load resistor and voltage detection method.
Solution Approach 2:
The patent introduces a load resistor as an intermediary component connected in series with the power line. By measuring the voltage across this known resistance value, the system can calculate the line resistance indirectly using Ohm's law. This intermediary approach enables accurate measurement without requiring direct low-resistance measurement capabilities, thus allowing the use of simpler, more portable detection devices.
2Measurement precision
If a load resistor is connected to measure line resistance, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic measurement by controlling the switching member to periodically connect and disconnect the load resistor. The control module activates the load resistor only during brief measurement intervals to capture voltage data, then disconnects it. This periodic action allows accurate line resistance measurement while minimizing continuous power consumption, as the load resistor draws current only during the measurement window rather than continuously.
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
Enables accurate measurement of line resistance in power circuits, allowing users to assess whether power lines or sockets need replacement, thereby preventing fires and being easily usable and portable.
Implementation Method 1
the control module calculates a line resistance value of the socket and the two power lines based on the maximum open-circuit voltage, the load voltage, and the load current
Implementation Method 2
The switching member has a first end and a second end, wherein the first end is electrically connected to another end of the load resistor, and the second end is electrically connected to the other one of the two electrical connection members
Data Source
AI summary
A detection device for detecting a line quality of an electric circuit includes two electrical connection members inserted into a socket and connected to two power lines, a load resistor, a switching member, a displaying module, and a control module. An end of the load resistor is connected to one of the electrical connection members, and another end thereof is connected to a first end of the switching member. A second end of the switching member is connected to the other electrical connection member. The control module controls the switching member to cut off when in a detection mode, and detects a peak voltage in a voltage waveform and records as a maximum open-circuit voltage, and controls the switching member to conduct and detects the peak voltage of the voltage waveform and records as a load voltage and calculates a load current. A line resistance value is calculated based on the maximum open-circuit voltage, the load voltage, and the load current. A message is correspondingly displayed via the displaying module.