Integrated Current Sensing Apparatus with Dynamic Parameter Control
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Solution Overview
Problem
Conventional current sensing circuits face accuracy issues due to instability and unreliability in resistance ratios caused by manufacturing processes and temperature variations, leading to inaccurate current estimation.
Innovation Solution
An integrated current sensing apparatus with a regulating unit that adjusts constant current, offset, and gain value, utilizing a magnetic-field sensing element, power supply circuit, offset adjustment circuit, and gain adjustment circuit, along with a temperature compensation circuit to maintain precision across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional current sensing circuits use fixed resistance ratios for gain and offset adjustment, then the circuit structure is simple, but the measurement precision deteriorates due to resistance ratio shifts from manufacturing instability and temperature variations
Solution Approach 1:
The patent applies dynamics by replacing fixed resistance ratios with dynamically adjustable parameters. The regulating unit stores and applies correction values for constant current, offset, and gain that can be adjusted based on temperature conditions and calibration data, transforming the static circuit into an adaptive system that maintains precision across varying conditions
Solution Approach 2:
The patent implements parameter changes by introducing correction values for constant current, offset, and gain that modify the original fixed parameters. The regulating unit stores multiple sets of correction values corresponding to different temperature ranges, allowing the circuit to switch between parameter sets to maintain accurate measurement across temperature variations
2Reliability
If resistance ratios are used for gain and offset adjustment, then the circuit is easy to manufacture, but the reliability deteriorates due to resistance ratio shifts from cutting process instability
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values in the regulating unit that compensate for manufacturing variations. During calibration at different temperatures, the system pre-determines the appropriate correction values for constant current, offset, and gain, which are then applied during operation to compensate for manufacturing imperfections without requiring high precision in the physical resistors
Solution Approach 2:
The patent implements feedback through the calibration process where correction values are determined based on actual performance measurements at different temperatures. The regulating unit uses this feedback information to select and apply appropriate correction values during operation, creating a closed-loop system that compensates for manufacturing variations
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 solution enhances the accuracy of current sensing by allowing precise control of parameters, compensating for temperature changes, and stabilizing resistance ratios, resulting in more reliable current estimation.
Implementation Method 1
The Hall element with the characteristic that the sensing voltage of which is in proportion to the current of an object to be measured
Data Source
AI summary
An integrated current sensing apparatus includes a magnetic-field sensing element, a power supply circuit, an offset adjustment circuit, a gain adjustment circuit and a regulating unit. The magnetic-field sensing element is configured for sensing magnetic field, and correspondingly generating a sensing voltage. The power supply circuit is electrically coupled to the magnetic-field sensing element, for generating a constant current to the magnetic-field sensing element to control the sensing voltage. The offset adjustment circuit is electrically coupled to the magnetic-field sensing element, for adjusting an offset of the sensing voltage. The gain adjustment circuit is electrically coupled to the offset adjustment circuit, for amplifying the sensing voltage to a rated output voltage. The regulating unit is electrically coupled to the power supply circuit, the offset adjustment circuit and the gain adjustment circuit, for controlling the constant current, the offset and a gain value.