SPD Module Thermal Disconnector for Overheat Bypass Protection
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Solution Overview
Problem
Existing surge protective devices (SPDs) do not effectively manage overvoltage conditions by providing an alternate current path when the overvoltage protection component overheats, leading to potential damage or failure.
Innovation Solution
A thermal disconnector mechanism in the SPD module transitions from a ready configuration to an actuated configuration upon overheating of the overvoltage protection component, forming an alternate current path that bypasses the protection component, ensuring continued operation and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overvoltage protection component is used to protect against voltage spikes, then protection capability is improved, but the component is vulnerable to overheating and potential failure
Solution Approach 1:
A thermal disconnector mechanism acts as an intermediary between the overvoltage protection component and the circuit. When the protection component overheats, the thermal disconnector detects the temperature rise and automatically opens the circuit, preventing further heat accumulation and potential failure. This intermediary mechanism protects the original protection component from thermal damage.
2Reliability
If the overvoltage protection component fails due to overheating, then protection is lost, but the device should continue to operate
Solution Approach 1:
The system automatically discards the failed overvoltage protection component by opening the circuit through the thermal disconnector when overheating occurs. The circuit is designed to allow replacement of the protection component while maintaining overall system operation. After the protection component is replaced, the system recovers its full protective capability.
3Reliability
If a thermal disconnector mechanism is added to provide alternate current path, then reliability under overheat conditions is improved, but device complexity increases
Solution Approach 1:
The thermal disconnector mechanism is designed to automatically detect temperature rise and open the circuit without requiring external control or intervention. The mechanism serves itself by using the thermal energy from the overheated component to trigger its own activation, thereby adding reliability without requiring complex control systems.
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 thermal disconnector mechanism effectively redirects current away from overheated components, preventing damage and ensuring continuous protection against voltage spikes.
Implementation Method 1
The thermal disconnector mechanism is operative to transition from the ready configuration to an actuated configuration responsive to sufficient overheating of the overvoltage protection component
Implementation Method 2
the switch member is held in the ready position by solder, and the solder is configured to be melted by heat from the overvoltage protection component to thereby release the switch member into the displaced position
Data Source
AI summary
A surge protective device (SPD) assembly includes a base and an SPD module configured to be mounted on the base. The SPD module includes an SPD module PCB, an SPD module circuit, and a thermal disconnector mechanism. The SPD module circuit is at least partly embodied in the SPD module PCB and includes an overvoltage protection component mounted on the SPD module PCB. The thermal disconnector mechanism is mounted on the SPD module PCB in a ready configuration. The thermal disconnector mechanism is operative to transition from the ready configuration to an actuated configuration responsive to sufficient overheating of the overvoltage protection component. When the thermal disconnector mechanism is positioned in the ready configuration, the SPD circuit forms a first current path through the overvoltage protection component. When the thermal disconnector mechanism is positioned in the actuated configuration, the thermal disconnector mechanism forms an alternate second current path that bypasses the overvoltage protection component.