Multilayer Board Current Detection Noise Shielding
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Solution Overview
Problem
Current current detection devices face challenges in achieving accurate current detection with low noise while maintaining cost-effectiveness, as existing solutions often require high-comparative-tracking-index insulating layers that increase manufacturing costs and are inefficient in noise shielding.
Innovation Solution
A current detection device with a multilayer board structure featuring specific wiring layers and insulating layers, where the first and third insulating layers have higher comparative tracking indices than the second, and a conductor with a fixed potential is used to shield noise, improving signal quality and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If insulating layers with high comparative tracking index are used throughout the multilayer board, then noise shielding performance is improved, but manufacturing costs increase
Solution Approach 1:
The patent applies different comparative tracking index requirements to different insulating layers based on their specific functions. The first insulating layer (between high-voltage wiring layer and inner wiring layers) and third insulating layer (between inner wiring layers and second surface) have high comparative tracking index (≥1600) for noise shielding, while the second insulating layer (between inner wiring layers) has lower requirements (≥175). This localized differentiation optimizes noise shielding where needed while reducing manufacturing costs elsewhere.
2Measurement precision
If high-comparative-tracking-index insulating layers are used, then current detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements differentiated comparative tracking index specifications for different insulating layers. The first and third insulating layers use high-comparative-tracking-index materials (≥1600) to ensure accurate current detection by minimizing noise interference in critical signal paths, while the second insulating layer uses lower-specification materials (≥175) where noise shielding is less critical, thereby reducing overall device complexity and cost.
Solution Approach 2:
The multilayer board's insulating structure is segmented into three distinct layers with different functional requirements. By dividing the insulating system into segments (first, second, and third insulating layers) with differentiated specifications, the patent achieves optimal current detection accuracy in critical areas while avoiding unnecessary complexity and cost in non-critical areas.
3Power
If high-voltage wiring is placed in outer layers, then electrical performance is improved, but noise interference with detection signals increases
Solution Approach 1:
The patent introduces high-comparative-tracking-index insulating layers as intermediary barriers between high-voltage wiring layers and inner wiring layers. The first insulating layer (≥1600 CTI) between the high-voltage first wiring layer and inner wiring layers, and the third insulating layer (≥1600 CTI) between inner wiring layers and the second surface, act as mediators that maintain electrical performance while blocking noise interference through their superior tracking resistance properties.
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 enables low-noise detection signals to be input to the control unit, enhancing current detection accuracy while reducing manufacturing costs by optimizing the insulating layer configuration and noise shielding.
Implementation Method 1
a first conductor arranged in the second wiring layer between the second wiring portion of the detection wire and the power module, and applied with a fixed potential
Data Source
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AI summary
A current detection device is provided by which an accuracy of current detection can be improved. A current detection device (100) includes a multilayer board (1), a current detection unit (CD1), a control unit (CNT1), a detection wire (SL1), and a conductor (GND1). A surface (1a) of the multilayer board (1) is provided for mounting a power module (IPM1) having switching elements. The current detection unit (CD1) is mounted on the surface (1a), detects a current flowing in the power module (IPM1), and outputs a detection signal. The control unit (CNT1) is mounted on the surface (1a), and receives the detection signal. The detection wire (SL1) is a wire that transmits the detection signal from the current detection unit (CD1) to the control unit (CNT1), and has wiring portions (51 to 53). The wiring portion (51) extends from the current detection unit (CD1) to a wiring layer (22b). The wiring portion (52) is connected to the wiring portion (51), and is formed in the wiring layer (22b). The wiring portion (53) is connected to the wiring portion (52), and extends from the wiring layer (22b) to the control unit (CNT1). In the wiring layer (22a), the conductor (GND1) is arranged between the wiring portion (52) and the power module (IPM1), and is applied with a fixed potential.