Current Measurement Using Temperature-Compensated Metal Bar
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Solution Overview
Problem
Current current diverts used in communication systems have high power consumption and instability due to large resistance values and temperature drift, leading to system faults and high manufacturing costs.
Innovation Solution
A method and device that measure current by using a metal bar with temperature and voltage sensors, analog-digital converters, and a controller to calculate resistance and current values, while reducing power consumption through increased resistance via holes or apertures on the metal bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current diverter with large resistance value is used to perform sampling detection on the current, then the current measurement can be achieved, but the power consumption becomes large and temperature rises
Solution Approach 1:
The patent changes the resistance parameter of the current diverter from a large value (causing high power consumption) to a small value (reducing power consumption). By using a current diverter with small resistance, the voltage drop across it is minimized, thereby reducing power consumption and temperature rise while still enabling accurate current measurement through voltage sampling.
2Measurement precision
If a current diverter with large resistance value is used, then the current measurement can be achieved, but the stability of the current diverter is reduced due to temperature changes
Solution Approach 1:
The patent changes the resistance parameter to a small value, which directly addresses the stability issue. With smaller resistance, the power consumption and temperature rise are reduced, thereby minimizing temperature drift and maintaining the stability of the current diverter's resistance value over time.
Solution Approach 2:
The patent employs temperature detection and compensation mechanisms. Temperature sensors monitor the temperature of the current diverter, and the system compensates for temperature drift by adjusting measurements based on the detected temperature, thereby maintaining measurement accuracy and stability despite environmental temperature changes.
3Measurement precision
If a current diverter with large resistance value is used, then the current measurement can be achieved, but the manufacturing cost becomes high
Solution Approach 1:
The patent changes the resistance parameter to a small value, which simplifies the manufacturing process and reduces material costs. Current diverters with small resistance values are easier to manufacture with standard materials and processes, thereby reducing overall manufacturing costs while maintaining measurement functionality.
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 approach reduces power consumption and improves stability by indirectly measuring current using resistance and voltage values, lowering the metal bar's temperature and maintaining system reliability with lower manufacturing costs.
Implementation Method 1
The temperature sensor is configured to measure a temperature between a first sampling point and a second sampling point located on the metal structure, and output a first signal according to the measured temperature
Implementation Method 2
The voltage sampling detector is configured to detect a first voltage signal at the first sampling point located on the metal structure and a second voltage signal at the second sampling point located on the metal structure
Implementation Method 3
The metal bar is configured to carry a current to be measured
Data Source
AI summary
A method and an electronic device are disclosed for measuring a current. The device measures a temperature between a first sampling point and a second sampling point on a metal structure carrying a current to be measured. The device outputs a first signal according to the measured temperature and a second signal after sampling and filtering the first signal. The device detects the first voltage signal at the first sampling point and the second voltage signal at the second sampling point. The device samples and filters a difference between the first voltage signal and the second voltage signal and outputs a third voltage signal. The device restores the second signal to a temperature value representing a temperature between the first sampling point and the second sampling point and calculates a resistance value between the first sampling point and the second sampling point according to the temperature value.