Shielded Printed Board for Stable Current Voltage Detection
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Solution Overview
Problem
Existing current and voltage detection systems in high-frequency power supply devices face variations in detection values due to wiring inconsistencies and instability in detector positions, leading to limited frequency bands and increased complexity in impedance matching.
Innovation Solution
A printed board with shield portions featuring through holes is used to reduce electric field influences, allowing for consistent current and voltage detection points and minimizing variations in detection values across multiple detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional wiring methods are used for current and voltage detection, then the detection system can be implemented, but variations in detection values occur due to wiring inconsistencies and detector position instability
Solution Approach 1:
The patent combines the current detector and voltage detector onto a single printed board, integrating both detection functions into one stable platform. This merging eliminates relative position changes between detectors and removes wiring inconsistencies, directly addressing the reliability and measurement precision problems.
Solution Approach 2:
The printed board serves as an intermediary platform that provides fixed, predetermined positions for both the current detector and voltage detector. This intermediary structure eliminates the need for traditional wiring connections and stabilizes detector positions, resolving the issues of wiring inconsistencies and position instability.
2Measurement precision
If detectors are placed close to each other to approximate detection points, then detection accuracy improves, but electric field interference increases
Solution Approach 1:
A shield portion is introduced as an intermediary element between the current detector and voltage detector on the printed board. This shield blocks electric field interference while allowing the detectors to remain in close proximity for accurate detection point approximation, thus resolving the contradiction between measurement precision and harmful electric field factors.
Solution Approach 2:
The shield portion extracts and isolates the electric field interference from the detection area. By placing the shield between the detectors and the power transmission conductor, it removes the harmful electric field influence while maintaining the close positioning needed for accurate detection.
3Reliability
If shield portions are added to reduce electric field influence, then detection stability improves, but device complexity increases
Solution Approach 1:
The shield portion is created using standard printed board fabrication techniques, copying the simplicity of PCB manufacturing processes. The shield is formed as a conductive layer on the printed board itself, utilizing existing manufacturing capabilities rather than requiring complex assembly, thus maintaining ease of manufacture while providing necessary shielding.
Solution Approach 2:
The shield's effectiveness is optimized by adjusting parameters such as the pattern, size, and position of through holes in the shield portion. These parameter changes allow the shield to provide adequate electric field blocking while maintaining a simple structure that is easy to manufacture and integrate into the printed board.
4Measurement precision
If through holes are formed in shield portions to maintain magnetic flux, then current detection accuracy improves, but manufacturing precision requirements increase
Solution Approach 1:
The through holes in the shield portion are designed with specific parameters including appropriate size, spacing, and pattern arrangement. These parameter optimizations ensure that the through holes are large enough and properly spaced to maintain magnetic flux for accurate current detection, while still being manufacturable using standard PCB drilling and plating processes without requiring excessive precision.
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 enables precise and stable detection of AC currents and voltages across a broader frequency range, reducing variations and simplifying impedance matching processes.
Implementation Method 1
a shield portion 500 configured to reduce an influence of an electric field in combination with a casing 300 accommodating the printed board 4
Implementation Method 2
a first wire 2, configured to detect an AC voltage generated in a power transmission conductor 66
Implementation Method 3
a second wire 10, configured to detect an AC current flowing in the power transmission conductor 66
Data Source
AI summary
A printed board, includes: a first shield portion, configured to reduce an influence of an electric field in combination with a casing accommodating the printed board, at least a part of the first shield portion being formed with a plurality of through holes; and a second shield portion, configured to reduce the influence of the electric field in combination with the casing, at least a part of the second shield portion being formed with a plurality of through holes, wherein the second shield portion is arranged alongside of the first shield portion.