PCB Contact Element Layout for Reliable Electrical Safety Switching
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Solution Overview
Problem
Existing contact-sensitive electrical safety devices face issues such as excessive wiring, complex implementation, lack of modularity, and oxidation of conductive materials, leading to potential failures in interrupting or limiting electrical machinery operations.
Innovation Solution
The use of a Printed Circuit Board (PCB) with interdigitated contact arrangements made of conductive materials like copper, covered with graphite to prevent oxidation, which simplifies assembly and reduces wiring by integrating all circuitry onto a single board, allowing for modular construction and reduced risk of oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional separate contact elements are used, then the device can detect contact, but excessive wiring and complex implementation are required
Solution Approach 1:
The patent merges multiple separate contact elements and their associated wiring into a single integrated circuit board. The circuit board contains all necessary contact points, conductive traces, and connection terminals in one unified structure, eliminating the need for extensive external wiring and reducing implementation complexity while maintaining contact detection reliability.
Solution Approach 2:
The circuit board serves multiple functions simultaneously: it acts as the structural support, the electrical conductor, the contact element holder, and the connection interface. This multi-functional integration reduces the number of separate components needed and simplifies the overall device architecture.
2Reliability
If conductive materials are exposed, then electrical contact is achieved, but oxidation occurs leading to potential failures
Solution Approach 1:
The patent uses composite material structures where conductive elements are combined with protective coatings or encapsulated within protective materials. This allows the conductive surfaces to maintain electrical functionality while being protected from oxidation by the protective layer, thus preventing contact failures.
Solution Approach 2:
The circuit board structure creates a protected environment for the conductive elements, effectively isolating them from oxidizing atmospheric conditions. The enclosed or coated conductive paths are shielded from oxygen exposure, preventing oxidation while maintaining electrical conductivity.
3Ease of manufacture
If modular construction is not used, then assembly is simpler, but adaptability and ease of repair are reduced
Solution Approach 1:
The circuit board is designed with modular segments or modules that can be independently manufactured, tested, and assembled. Each module contains specific contact elements and circuitry, allowing for flexible configuration and easy replacement of individual modules without affecting the entire device, thus improving adaptability while maintaining manufacturing efficiency.
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 solution simplifies implementation, reduces wiring, prevents oxidation, and enables modular design, ensuring reliable and cost-effective electrical safety devices with reduced assembly errors and increased durability.
Implementation Method 1
a first contact arrangement 22a and a second contact arrangement 22b are provided by means of PCB printing on a front face 21' of the printed circuit base 21
Implementation Method 2
covered with graphite to prevent oxidation
Data Source
Figure 1~2A
Figure 2B~4A
Figure 4B~6A
AI summary
An electrical safety device (1, 30) is provided with: a sensitive element (20); and a conductive actuator element (35) that switches an operating state of the sensitive element (20) in response to a contact acting on the electrical safety device. The sensitive element (20) is provided with at least one printed circuit base (21), made of a rigid or flexible material, on which a first and a second contact arrangements (22a, 22b) are provided, normally electrically separated; the conductive actuator element (35) establishes an electrical contact between the first and the second contact arrangements (22a, 22b), in response to the contact acting on the electrical safety device.