Electric Compressor Control Substrate Ground Pattern Segmentation
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Solution Overview
Problem
The complex arrangement of wires on a substrate in electric compressor control systems for vehicular air conditioning devices generates significant electromagnetic noise, which affects other devices due to the difference in voltage and current fluctuations between high and low voltage systems.
Innovation Solution
The electric compressor control system employs multiple ground patterns on a substrate with inductive components, such as coils, strategically placed in wiring patterns that traverse these regions to reduce noise generation and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wires (power supply lines, communication lines, etc.) are arranged on the substrate in a complex manner to connect to the microcomputer, then the connectivity and functionality of the control system is improved, but electromagnetic noise is easily generated
Solution Approach 1:
The substrate is divided into multiple regions by ground patterns, creating separate zones for different functional areas. This segmentation isolates noise-generating wiring from sensitive microcomputer connections, reducing electromagnetic interference while maintaining system connectivity.
Solution Approach 2:
Ground patterns serve as intermediary elements between different wiring regions and the microcomputer. These ground patterns act as shielding barriers that intercept and divert electromagnetic noise away from sensitive signal lines, allowing complex wiring arrangements without excessive noise generation.
2Power
If high voltage is applied to drive the electric motor, then the power and driving capability is improved, but noise current is generated in the control circuit
Solution Approach 1:
The high voltage motor driving function is electrically separated from the low voltage control circuit through dedicated power supply lines and ground patterns. This extraction isolates the noise-generating high voltage operations from the sensitive control signals, allowing both high power output and clean control signals to coexist.
Solution Approach 2:
Multiple ground patterns are strategically placed to create equipotential zones that stabilize voltage levels in different regions of the substrate. This equipotential design prevents voltage fluctuations and current loops that would otherwise generate noise current in the control circuit during high voltage motor operation.
3Ease of manufacture
If a single ground pattern is used on the substrate, then the manufacturing process is simplified, but noise pathways are extended and noise generation is increased
Solution Approach 1:
The ground pattern is segmented into multiple separate ground regions distributed across the substrate. This segmentation shortens the effective noise pathways by creating multiple localized ground references, reducing the antenna effect and electromagnetic radiation while remaining manufacturable through standard PCB fabrication processes.
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 effectively suppresses electromagnetic noise, minimizing its impact on other vehicle systems by shortening noise pathways and utilizing inductive components to absorb noise, thereby improving the overall noise reduction within the control system.
Implementation Method 1
an inductive component provided at a location, in the wiring pattern, that traverses the regions divided by the different ground patterns
Data Source
AI summary
The present invention suppresses electromagnetic noise generated from a substrate on which a microcomputer and the like are mounted. An electric compressor control system has regions divided by a plurality of ground patterns formed on a substrate. On the substrate, a vehicle information obtaining line is formed so as to traverse the regions divided by the plurality of ground patterns, and the vehicle information obtaining line is connected to a microcomputer provided on the substrate. On the vehicle information obtaining line, a coil is provided at a location that traverses the region and the region divided by the different ground patterns. The coil reduces noise generated from the vehicle information obtaining line.