Electric Circuit Device Noise Isolation via Segmented Base Plate
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Solution Overview
Problem
Existing power conversion devices in vehicles face challenges in completely blocking electromagnetic coupling between high-voltage and low-voltage circuits, leading to insufficient reduction of conductive noises to the outside, especially as devices are miniaturized, causing noise interference with external circuits.
Innovation Solution
An electric circuit device design featuring a noise generating circuit unit housed in an earthed metal enclosure with a high impedance component, such as a slit or resin portion, between two base plates, which supports the control board and interposes a high impedance component to reduce noise propagation to the outside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single base plate is used to support the control board, then the structure is simple, but electromagnetic coupling between the noise generating circuit unit and control board cannot be completely blocked
Solution Approach 1:
The base plate is divided into a first base plate and a second base plate that are separated from each other. The noise generating circuit unit is disposed between these two separated base plates, creating physical separation that blocks electromagnetic coupling while still providing structural support for the control board.
2Volume of moving object
If the control circuit unit and power circuit are provided on the same multilayer printed circuit board, then the device is compact, but electromagnetic coupling between these circuits cannot be completely blocked
Solution Approach 1:
The device is segmented into separate functional units: a noise generating circuit unit housed in a conductive housing and a control circuit unit on the control board. These segmented units are positioned on opposite sides of the separated base plates, blocking electromagnetic coupling while maintaining compact overall device dimensions.
3Device complexity
If no high impedance component is introduced, then the structure is simpler, but conductive noises to the outside are not sufficiently reduced
Solution Approach 1:
A high impedance component is introduced as an intermediary element between the first base plate and the second base plate. This high impedance component acts as a mediator that blocks the propagation of conductive noises from the noise generating circuit unit to the control board and external circuits, while still allowing the structural function of the base plates.
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
Effectively reduces conductive noises from the electric circuit device to the outside by directing noise currents to ground, thereby minimizing interference with external circuits and adhering to noise regulation standards.
Implementation Method 1
a high impedance component which has impedance higher than that of the base plate against noises
Implementation Method 2
a housing which stores the noise generating circuit unit thereinside, is electrically earthed
Data Source
AI summary
An electric circuit device includes a noise generating circuit unit which generates noises, a housing which stores the noise generating circuit unit thereinside, is electrically earthed, and includes an opening, a control board which is provided with a connector to connect a wiring to an outside, a base plate which is disposed between the noise generating circuit unit and the control board to cover the opening of the housing, and a high impedance component which has impedance higher than the base plate against the noises. The base plate includes a first base plate which supports the control board, and a second base plate which is separated from the first base plate. The first base plate and the second base plate are disposed to interpose the high impedance component therebetween.