Electronic Control Unit Layout for Noise Reduction
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Solution Overview
Problem
Conventional electronic control units for electric power steering devices suffer from noise and potential fluctuations due to the layout of current and control circuits, leading to degraded performance and accuracy in controlling the motor.
Innovation Solution
The electronic control unit is designed with a specific layout where the current input part is opposite to the current circuit part, reducing noise interference and allowing for a compact substrate design by not extending the control circuit part along the current flow direction, thus improving noise performance and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the control circuit part is disposed along the direction in which the current input part and the current circuit part are arranged, then the substrate size is reduced, but noise or potential fluctuations from the large current affect the control circuit part, degrading product performance and control accuracy
Solution Approach 1:
The substrate is divided into distinct functional regions: a current input region for the current input part, a current circuit region for the current circuit part, and a control circuit region for the control circuit part. This spatial segmentation isolates the control circuit from the noisy current paths while maintaining efficient substrate utilization.
Solution Approach 2:
Different regions of the substrate are assigned different functional qualities: the current input and current circuit regions are designed to handle high currents with appropriate trace widths and impedance, while the control circuit region is designed with low-impedance paths and shielding to protect against noise, giving each local area the specific properties needed for its function.
2Object-affected harmful factors
If the control circuit part and the current circuit part are disposed in spaced-apart relation or a slit is formed between them, then noise interference is reduced, but the substrate size increases or the design becomes complicated
Solution Approach 1:
The substrate is divided into distinct functional regions with the control circuit part positioned in a separate control circuit region from the current circuit part. This segmentation provides natural noise isolation without requiring additional spacing or slits, as the functional regions are inherently separated by design.
Solution Approach 2:
Instead of separating circuits in the planar dimension by adding spacing or slits, the design uses dimensional efficiency by arranging regions in a compact layout where the control circuit region is positioned to be electrically isolated from current paths while minimizing the overall substrate footprint.
3Object-affected harmful factors
If the control circuit part and the current circuit part are disposed in spaced-apart relation or a slit is formed between them, then noise interference is reduced, but the design of the substrate becomes complicated
Solution Approach 1:
The substrate design uses clear functional segmentation into current input region, current circuit region, and control circuit region, which simplifies the overall design process by providing a systematic layout approach. This segmentation makes the design more straightforward compared to complex spacing and slit configurations.
Solution Approach 2:
Each region is designed with local quality appropriate to its function, making the overall design more manageable. The current regions use high-current design practices while the control region uses low-noise design practices, allowing independent optimization of each area without complex inter-regional considerations.
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
This configuration enhances the accuracy of controlling the control target, reduces substrate size, and simplifies the design by minimizing noise impact on the control circuit components, resulting in a high-performance, small-sized electronic control unit.
Implementation Method 1
The switching element generates heat when actuated
Data Source
AI summary
In an electronic control unit, a current circuit part is provided on a substrate and includes a switching element. During the control of a control target, a current having a relatively large value of a predetermined value or more flows in the current circuit part. A control circuit part is provided on the substrate and includes a control part that controls actuation of the switching element on the basis of a control signal to control the control target. A current input part is provided on the substrate so as to be located opposite to the control circuit with respect to the current circuit portion. To the current input portion, the current to be supplied to the control target via the current circuit portion is input.