PCB Power Converter Layout With Shield Pattern for Noise Resistance
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Solution Overview
Problem
Existing power conversion devices face challenges in downsizing while maintaining effective noise resistance, as noise generated by electronic components interferes with control circuit boards, leading to malfunctions.
Innovation Solution
The power conversion device incorporates a casing with intersecting printed boards and a control circuit board featuring a shield pattern in a different layer from the circuit wiring, partially overlapping the circuit wiring to block noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power conversion device is downsized by three-dimensionally disposing electronic components and control circuit board, then the device size is reduced, but the noise resistance of the control circuit board deteriorates
Solution Approach 1:
The patent applies dimensional arrangement by disposing the control circuit board along the second printed board that intersects with the first printed board at substantially right angles. This three-dimensional spatial arrangement allows compact packaging while maintaining adequate noise shielding distance and configuration, resolving the contradiction between downsizing and noise resistance
Solution Approach 2:
The patent introduces a shield pattern on the control circuit board that acts as an intermediary between the noise source (electronic components on the first printed board) and the sensitive control circuitry. This shield pattern intercepts and redirects electromagnetic noise, protecting the control circuit board while allowing close proximity arrangement for downsizing
2Object-affected harmful factors
If the wiring connecting the power conversion element and the control element is shortened, then the noise influence is reduced, but the noise resistance of the control circuit board cannot be sufficiently increased
Solution Approach 1:
The shield pattern serves as an intermediary protective layer between noise sources and control circuitry. Even with shortened wiring, the shield pattern intercepts electromagnetic fields and prevents noise coupling, providing enhanced noise resistance that wiring length reduction alone cannot achieve
Solution Approach 2:
The patent moves the shielding approach from one-dimensional wiring length control to two-dimensional spatial arrangement and layer configuration. By arranging the control circuit board along the intersecting second printed board and configuring the shield pattern in specific layers, the patent achieves superior noise resistance beyond what wiring length reduction can provide
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 enables downsizing while providing excellent noise resistance, preventing noise superposition and malfunctions, and enhancing electrostatic shielding.
Implementation Method 1
The control circuit board includes circuit wiring and a shield pattern opposite to the circuit wiring in a layer different from the circuit wiring. When viewed from an opposite direction in which the shield pattern is opposite to the circuit wiring, the shield pattern at least partially overlaps the circuit wiring.
Data Source
AI summary
A power conversion device includes a casing, a first printed board, a second printed board, and a control circuit board. The casing has at least two inner surfaces. The first printed board is fixed to the inner surface of the casing. The second printed board is fixed to the inner surface of the casing, and disposed so as to intersect with the first printed board. The control circuit board is disposed along the second printed board. The control circuit board includes a circuit wiring and a shield pattern opposite to the circuit wiring in a layer different from the circuit wiring. When viewed from an opposite direction in which the shield pattern is opposite to the circuit wiring, the shield pattern at least partially overlaps the circuit wiring.