Magnetic Current Sensing with Dual Gain Paths for Fast Event Detection
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Solution Overview
Problem
Current sensor devices struggle to achieve both high precision in current measurement and fast detection of events like overcurrents, particularly in applications such as electric vehicles where safety and accuracy are critical.
Innovation Solution
A current sensor device that utilizes a magnetic sensing element for contactless current measurement, featuring amplification means with adjustable gains and bandwidths, and processing means to separately handle signals for current measurement and event detection, allowing for high precision and fast event detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single amplification path with fixed gain and bandwidth is used, then the device complexity is low, but it cannot simultaneously achieve high precision current measurement and fast event detection
Solution Approach 1:
The patent divides the signal processing into two separate amplification paths: a first amplification path with first amplification means for precision current measurement, and a second amplification path with second amplification means for fast event detection. This segmentation allows each path to be optimized independently for its specific function, resolving the contradiction between measurement precision and detection speed.
Solution Approach 2:
The patent employs dynamic gain switching where the first gain is adjustable based on the measured current magnitude. When current is below a threshold, higher gain is applied for precision measurement; when current exceeds the threshold, lower gain is applied to prevent saturation and enable fast event detection. This dynamic adaptation allows the system to achieve both precision and speed under different operating conditions.
2Measurement precision
If high gain is used for precision measurement, then measurement precision is improved, but event detection speed deteriorates due to signal saturation
Solution Approach 1:
The patent implements dynamic gain control where the first gain is adjusted based on the measured current level. When current is small, high gain amplifies the signal for precise measurement. When current approaches the threshold level, the gain is reduced to prevent saturation, allowing the system to quickly detect events without losing measurement precision for normal operating conditions.
Solution Approach 2:
The patent changes the amplification parameter (gain) dynamically based on the input signal level. By switching between different gain values depending on whether the current is below or above a threshold, the system adapts its measurement range to maintain both precision for small signals and responsiveness for large signals, eliminating the trade-off between precision and detection speed.
3Reliability
If separate processing paths with different gains are used, then both precision and speed requirements are met, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated circuit blocks. The first and second amplification means are merged within a single current sensor device, sharing common components such as the magnetic sensing element and output terminals. This merging reduces overall device complexity while maintaining the benefits of separate processing paths for precision measurement and fast detection.
Solution Approach 2:
The patent designs the amplification means to serve multiple functions: the first amplification path handles both precision current measurement and contributes to event detection, while the second amplification path provides fast event detection capability. This multi-functionality reduces the need for completely separate independent systems, thereby controlling device complexity while achieving high reliability.
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 device achieves high precision in current measurement while enabling fast detection of events, thereby ensuring safety and reliability in applications like electric vehicles.
Implementation Method 1
current sensing means comprising a magnetic sensing element for contactlessly measuring the current
Data Source
AI summary
A current sensor device for measuring a current in a conductor comprising: current sensing means comprising a magnetic sensing element for contactlessly measuring the current; amplification means arranged to act in a first and second state, said amplification means in said first and second state being arranged for amplifying a first and second signal, respectively, from said current sensing means with an adjustable first gain and a second gain and a first and second bandwidth to yield a first and second amplified signal, respectively, wherein said first gain is higher than the second gain, wherein the first gain and the second gain are larger than 1; processing means for controlling at least said first gain, for detecting an event based on at least said second amplified signal and for producing a signal indicative of said event; an output terminal arranged for outputting a signal indicative of said current based on said first amplified signal; and an output terminal arranged for outputting said signal indicative of the event.