Current Sensor Filter Gain Compensation for Transient Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current detection devices face challenges in maintaining good transient response characteristics for current measurement due to deterioration in magnetic field detection, leading to overshoot or delay, especially when dealing with sharp changes in current.
Innovation Solution
A current sensor and detection method that include a filter unit with adjustable gain to cancel out fluctuations in detection gain across different frequency bands, ensuring accurate and timely detection of current changes without excessive overshoot or delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic sensor with good transient response characteristics is used, then the magnetic field detection capability is improved, but the sensor becomes deteriorated in current measurement characteristics when operated as a current detection device
Solution Approach 1:
The patent applies parameter changes by adjusting the gain of the filter unit across different frequency bands to compensate for the detection gain fluctuations of the magnetic sensor. The filter unit has a gain that varies with frequency, specifically designed to cancel out the gain changes in the magnetic sensor across its operating frequency range, thereby maintaining stable current measurement characteristics while preserving the sensor's good transient response capabilities.
2Speed
If the detection device operates at higher frequencies, then the response speed to current changes is improved, but the detection gain fluctuates causing overshoot or delay
Solution Approach 1:
The patent implements a feedback mechanism where the filter unit's gain is designed to respond to and counteract the detection gain fluctuations of the magnetic sensor. The filter unit receives the output from the magnetic sensor and applies frequency-dependent gain adjustment, effectively creating a feedback loop that stabilizes the overall detection gain across different frequency bands, preventing overshoot and delay while maintaining fast response speed.
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 effectively maintains favorable transient response characteristics by offsetting gain fluctuations, preventing overshoot and maintaining response speed, thus providing reliable current detection.
Implementation Method 1
a detection unit that outputs a signal corresponding to a magnetic field generated by detection current flowing through a current path
Implementation Method 2
The filter unit has gain that cancels out the change in the detection gain in at least a part of the gain fluctuation band
Data Source
AI summary
Deterioration in transient response characteristics of a current sensor may cause overshoot or delay. Thus, it is difficult to achieve good transient response characteristics of a magnetic field. A current sensor is provided, including: a detection unit outputting a signal corresponding to a magnetic field generated by detection current flowing through a current path; a reception unit receiving the signal corresponding to the magnetic field; a filter unit filtering the signal received by the reception unit; and an output unit outputting an output signal indicating the detection current according to the filtered signal, wherein detection gain, as gain of magnetic flux density detected by the detection unit, has a gain fluctuation band that changes with an increase in a frequency of the detection current, and the filter unit has gain that cancels out the change in the detection gain in at least a part of the gain fluctuation band.