Electronic Control Assembly EMC Filter Circuit Topology
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Solution Overview
Problem
Electrical devices with motors generate wide-spectrum noise that can cause electromagnetic compatibility interference, which is conducted through ground wires to other circuit modules, exceeding acceptable limits and compromising electromagnetic compatibility.
Innovation Solution
An electrical control assembly with a power filter circuit and an electromagnetic compatibility filter circuit is introduced, where the EMC filter circuit provides high-frequency impedance between the motor ground and system protection ground, forming a current loop that suppresses interference signals and attenuates them through heat dissipation, thereby improving the device's immunity to electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a motor is used in the electrical device, then the device can perform mechanical work, but the motor generates wide-spectrum noise that causes electromagnetic compatibility interference
Solution Approach 1:
The patent introduces an electromagnetic compatibility filter circuit as an intermediary component between the motor ground terminal and the system protection ground. This filter circuit, containing inductance and capacitance elements, mediates the electromagnetic interference by providing a filtered path for noise signals, allowing the motor to operate while suppressing the generated electromagnetic compatibility interference.
2Object-affected harmful factors
If the motor noise is conducted through the ground wire to other circuit modules, then the electromagnetic compatibility interference increases, but adding filtering components increases device complexity
Solution Approach 1:
The patent applies local quality by placing the electromagnetic compatibility filter circuit specifically at the motor ground terminal connection point, rather than throughout the entire system. This localized approach provides targeted suppression of motor-generated interference at its source, improving electromagnetic compatibility without requiring system-wide modifications or adding excessive complexity.
3Reliability
If an electromagnetic compatibility filter circuit is added to suppress interference, then electromagnetic compatibility is improved, but the device complexity increases
Solution Approach 1:
The electromagnetic compatibility filter circuit serves as an intermediary component that can be independently integrated into the existing electrical control assembly. By positioning this filter circuit between the motor ground terminal and the system protection ground, the patent achieves improved electromagnetic compatibility through a modular addition that maintains relatively simple overall device structure.
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 suppresses electromagnetic compatibility radiation and enhances the immunity of electrical devices to electromagnetic interference, preventing interference from exceeding standards and reducing noise transmission to the system protection ground.
Implementation Method 1
the electromagnetic compatibility filter circuit can provide high frequency impedance... attenuates them through heat dissipation
Data Source
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AI summary
Disclosed is an electronic control assembly, comprising an electronic control board (100), wherein the electronic control board (100) is provided with a system reference ground (GND), a power source input terminal (CN11) and a grounding wire terminal (CN12) for connecting to a power source, and a power source output terminal (CN21) and an electric motor grounding terminal (CN22) for connecting to an electric motor, the grounding wire terminal (CN12) being connected to the system reference ground (GND); a power source filtering circuit (10), wherein an input end of the power source filtering circuit (10) is connected to the power source input terminal (CN11), and an output end of the power source filtering circuit (10) is connected to the power source output terminal (CN21); and an electromagnetic compatibility filtering circuit (20), wherein an input end of the electromagnetic compatibility filtering circuit (20) is respectively connected to the electric motor grounding terminal (CN22) and a grounding end of the power source filtering circuit (10), the output end of the power source filtering circuit (10) being connected to the system reference ground (GND). The electronic control assembly supresses electromagnetic compatibility electromagnetic radiation generated by the electric motor, thereby improving the overall electromagnetic compatibility anti-interference performance of an electric appliance.