Electric Pump PCB Layout for Common-Mode EMI Filtering
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Solution Overview
Problem
The increasing number of electronic components on a Printed Circuit Board (PCB) in electric pumps poses a challenge in arranging them to enhance electromagnetic compatibility, as interference signals affect the working performance of components.
Innovation Solution
Incorporating a common mode filter with a common mode inductor close to the power input port and arranging it without a wire in the PCB's wiring film layer, along with additional filtering and absorption components like TVS and magnetic beads, to filter out common mode signals and improve electromagnetic compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common mode filter with a common mode inductor is added to the PCB, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The patent extracts the common mode inductor as a separate component from the PCB wiring structure. By positioning the common mode inductor at a specific location on the PCB and ensuring no wire passes through its corresponding position in the wiring film layer, the filter function is separated from the general wiring, reducing electromagnetic interference while maintaining manageable complexity
Solution Approach 2:
The common mode inductor acts as an intermediary element between the power input port and the rest of the circuit. It mediates the power signal by filtering out common mode interference signals before they can affect other electronic components, thus improving electromagnetic compatibility without requiring complete redesign of the entire PCB
2Reliability
If the common mode inductor is arranged close to the power input port, then filtering effectiveness is improved, but wiring complexity increases
Solution Approach 1:
The patent applies local quality by creating a wire-free zone at the specific location where the common mode inductor is positioned on the PCB. This localized modification ensures that the inductor can effectively filter common mode signals from the power input port without requiring wires to pass through its magnetic field, thereby maintaining filtering effectiveness while controlling wiring complexity through targeted design
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 filters out common mode signals, reduces wiring complexity, and enhances the electromagnetic compatibility of the PCB and the electric pump, improving overall performance.
Implementation Method 1
a common mode filter including a common mode inductor. The common mode inductor is arranged close to the power input port. In a direction perpendicular to the PCB, no wire is provided at a position in a wiring film layer in the PCB corresponding to the common mode inductor
Implementation Method 2
The TVS is configured to absorb an interference signal in a communication signal transmitted via the communication interface
Implementation Method 3
the magnetic bead is configured to absorb an abnormal high-frequency signal in the communication signal transmitted via the communication interface
Data Source
AI summary
An electric pump is provided. The electric pump includes a PCB board, where the PCB board is formed with a power input port. The electric pump further includes a common mode filter, where the common-mode filter includes a common mode inductor, and the common mode inductor is arranged close to the power input port; and in a direction perpendicular to a plane on which the PCB is located, no wiring is provided at the common mode inductor corresponding to a wiring film layer in the PCB.