PCB Rogowski Coil Current Sensing With DC Suppression Circuits
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Solution Overview
Problem
Current current detection systems, relying on current transformers (CTs) and meters, face challenges in miniaturization and integration into electrical equipment due to their large size and technical limitations.
Innovation Solution
A current detection system comprising a printed circuit board with Rogowski coils and amplification apparatuses, including amplifier circuits and active inductance circuits, which allows for compact integration and effective current detection by amplifying and processing signals from current-carrying conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional current transformers (CT) and meters are used for current detection, then current detection function is achieved, but the size becomes excessively large and integration into electrical equipment becomes difficult
Solution Approach 1:
The current detection system is segmented into multiple independent detection units, each comprising a Rogowski coil and associated amplification circuitry. This segmentation allows the system to be divided into smaller functional modules that can be integrated into electrical equipment more easily, resolving the contradiction between system size and integration capability.
Solution Approach 2:
The patent replaces traditional electromagnetic current transformers with Rogowski coils that utilize flexible sensing elements and electronic amplification circuits. This substitution transitions from a bulky mechanical electromagnetic system to a more compact electronic system, reducing overall size while maintaining detection functionality and improving integrability.
2Volume of moving object
If Rogowski coils are used for current detection, then size is reduced and integration is facilitated, but direct current signals in output signals cause impact on detection accuracy
Solution Approach 1:
The patent extracts and removes the direct current component from the output signal through dedicated DC suppression circuits. By separating and eliminating the harmful DC offset, the system maintains the benefits of Rogowski coils (compact size) while restoring measurement precision by ensuring only the relevant AC current information is processed.
Solution Approach 2:
The patent introduces intermediary amplification and signal processing circuits between the Rogowski coil and the final measurement system. These intermediary circuits, including differential amplifiers and DC suppression stages, act as mediators that condition the raw coil output by removing DC components and amplifying the useful AC signal, thereby preserving both compact size and measurement accuracy.
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 the integration of current detection systems into electrical equipment, reducing the impact of direct current signals and improving signal accuracy through active inductance circuitry, thus addressing the limitations of traditional CTs and meters.
Implementation Method 1
N Rogowski coils are mounted on the printed circuit board. The nth Rogowski coil in the N Rogowski coils is capable of being mounted concentric with the nth current-carrying conductor in N current-carrying conductors
Implementation Method 2
An output end of the nth Rogowski coil is connected to an input end of the first amplification apparatus in the nth group of amplification apparatus in the N groups of amplification apparatuses
Implementation Method 3
The foregoing current detection system may reduce direct current signals in signals output by the amplifier circuit, to alleviate impact of the direct current signals on the output signals
Data Source
AI summary
A current detection system, a current detection method, and a detection apparatus are provided. The current detection system includes a printed circuit board and N groups of amplification apparatuses, wherein N is a positive integer greater than or equal to 1. Each group includes at least one amplification apparatus. N Rogowski coils are mounted on the printed circuit board. The nth Rogowski coil is capable of being mounted concentric with the nth current-carrying conductor in N current-carrying conductors, which is perpendicular to a plane of the nth Rogowski coil. An output end of the nth Rogowski coil is connected to an input end of the first amplification apparatus in the nth group of the N groups of amplification apparatuses. The foregoing current detection system provides more convenience when being integrated into different electrical equipment, in particular when each group of amplification apparatus includes multiple amplification apparatuses.