PCB-Mountable Surge Protective Device Modules With Remote Signal Contacts
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Solution Overview
Problem
Existing surge protective devices (SPDs) face challenges in providing effective overvoltage protection and monitoring for electrical power circuits, particularly in sensitive facilities like telecommunications and hospitals, where equipment damage from transient overvoltages and surge currents can be costly and downtime is not acceptable.
Innovation Solution
A surge protective device (SPD) circuit system comprising a printed circuit board (PCB) assembly, an SPD module with an overvoltage clamping element, and an SPD monitoring system, which includes remote signal contacts and a thermal disconnector mechanism to provide persistent electrical connections and detect module conditions, ensuring reliable overvoltage protection and monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional SPDs are used with internal thermal disconnectors and external fuses, then overcurrent protection is provided, but device complexity increases and reliability decreases due to multiple failure points
Solution Approach 1:
The SPD is divided into modular components: a replaceable SPD module containing the overvoltage clamping element, and a permanent PCB assembly containing the monitoring circuitry and remote signal contacts. This segmentation allows the complex protective functions to be separated from the monitoring functions, improving reliability by isolating failure points to the replaceable module while maintaining system intelligence through the permanent PCB assembly.
Solution Approach 2:
The patent introduces remote signal PCB contacts and RS spring contacts as intermediary elements that provide persistent electrical connections between the SPD module and the monitoring system. These intermediary contacts enable the monitoring system to detect module presence and condition without adding complexity to the module itself, thereby improving reliability through better monitoring capability while maintaining simplicity in the SPD module design.
2Measurement precision
If SPDs lack persistent electrical connections for monitoring, then device complexity is reduced, but measurement precision and reliability of surge protection status deteriorate
Solution Approach 1:
The remote signal PCB contacts are pre-configured on the PCB assembly before the SPD module is installed. This preliminary preparation ensures that monitoring connections are already in place and properly positioned, enabling immediate and accurate detection of surge protection status upon module installation without requiring complex connection procedures or additional components.
Solution Approach 2:
The RS spring contacts serve as intermediary elements that bridge the SPD module and the monitoring system through persistent electrical connections. These spring contacts maintain reliable electrical contact through elastic deflection and persistent loading, ensuring accurate measurement of surge protection status while keeping the connection mechanism simple and robust.
3Ease of repair
If SPD modules use soldered connections, then electrical connectivity is reliable, but ease of repair and maintenance deteriorates due to permanent attachment
Solution Approach 1:
The patent employs dynamic spring contacts instead of static soldered connections. The RS spring contacts utilize elastic deflection to maintain persistent electrical loading against the remote signal PCB contacts. This dynamic connection mechanism provides reliable electrical connectivity through continuous elastic force while enabling easy module replacement by simply disengaging the spring contacts, thereby improving ease of repair without sacrificing connection reliability.
4Loss of information
If SPDs do not include monitoring systems, then device complexity is reduced, but loss of information regarding protection status and timing increases
Solution Approach 1:
The patent implements a monitoring system that provides feedback about SPD module presence, surge protection status, and operational conditions through the remote signal contacts. The PCB assembly continuously monitors the electrical connections and can detect when surges occur or when the module needs replacement. This feedback mechanism reduces information loss by providing real-time status information while keeping the monitoring system integrated into the existing PCB structure, minimizing additional complexity.
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 SPD circuit system effectively provides overvoltage protection and monitoring, allowing for timely detection of module failures and preventing equipment damage by persistently loading remote signal contacts and disconnecting power terminals in case of thermal events, thus reducing downtime and maintenance costs.
Implementation Method 1
the RS spring contact is elastically deflected and persistently loads the RS contact portion against the RS PCB contact
Implementation Method 2
the overvoltage clamping element provides overvoltage protection to the electrical power circuit
Implementation Method 3
disconnecting power terminals in case of thermal events
Data Source
AI summary
A surge protective device (SPD) circuit system for providing overvoltage protection to an electrical power circuit includes a PCB assembly, an SPD module, and an SPD monitoring system. The PCB assembly selectively mountable on the PCB includes a PCB and a remote signal (RS) PCB contact on the PCB. The SPD module includes an overvoltage clamping element and an RS spring contact including an RS contact portion. When the SPD module is mounted on the PCB and the electrical power circuit is connected to the PCB: the PCB electrically connects the SPD module to the circuit and the overvoltage clamping element provides overvoltage protection to the circuit; the RS contact portion engages the RS PCB contact; the RS spring contact is elastically deflected and persistently loads the RS contact portion against the RS PCB contact; and the RS spring contact is electrically connected to the SPD monitoring system via the RS PCB contact.