Power Conversion Circuit Board Noise Reduction
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Solution Overview
Problem
In integrated electric compressors, the coexistence of small signal systems operating at low voltage and high power systems requiring high voltage leads to electromagnetic noise interference, which complicates space-saving designs for in-vehicle air conditioners.
Innovation Solution
A power conversion circuit board with separate areas for low voltage and high voltage circuits, where the high voltage circuit's wiring intersects with a bus bar and includes an RC circuit, effectively absorbs and reduces electromagnetic noise while maintaining space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the density of elements in both small signal system circuit and high power system circuit is increased to save space, then space-saving property is improved, but electromagnetic noise interference from high voltage circuit to low voltage circuit increases
Solution Approach 1:
The circuit board is divided into distinct high voltage circuit area and low voltage circuit area, physically separating the two systems to prevent electromagnetic noise interference while maintaining high element density within each separated zone
Solution Approach 2:
Different regions of the circuit board are assigned different functional qualities - the high voltage area is optimized for power handling with appropriate clearance, while the low voltage area is optimized for signal integrity, allowing each region to operate at its optimal density without interfering with the other
2Object-affected harmful factors
If wiring and bus bar are arranged in parallel, then electromagnetic noise is reduced, but the area occupied by high voltage circuit increases
Solution Approach 1:
The wiring and bus bar are arranged in an intersecting configuration rather than parallel, utilizing three-dimensional spatial arrangement to achieve electromagnetic noise cancellation while minimizing the planar area occupied by the high voltage circuit components
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 significantly reduces electromagnetic noise interference while maintaining the space-saving properties of the integrated electric compressor, allowing for a more compact and efficient power conversion circuit board.
Implementation Method 1
electromagnetic noise generated by driving of the switching element is absorbed between the wiring formed on the board surface and the bus bar provided at a predetermined distance from the board surface
Implementation Method 2
since the electromagnetic noise generated by driving of the switching element is effectively absorbed by the portions in which the electromagnetic noises intersect with each other
Data Source
AI summary
A power conversion circuit board (1) is a board on which a power conversion circuit which converts direct current to alternating current is mounted. A low voltage circuit (10b) to which a low voltage is applied and a high voltage circuit (10a) to which a high voltage is applied are separately disposed in different areas on the same board surface. Further, the high voltage circuit (10a) includes a bus bar in which a part of a wiring is formed on the board surface and another wiring is provided with a predetermined distance from the board surface.