SPD Module Thermal Bypass Circuit for Overheat Protection
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Solution Overview
Problem
Existing surge protective devices (SPDs) do not effectively manage the transition from overvoltage protection to bypass mode when components overheat, leading to potential damage from continued exposure to voltage spikes.
Innovation Solution
Incorporation of a thermal disconnector mechanism in the SPD module that 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.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overvoltage protection component continues to operate after overheating, then the device structure remains simple, but the component may be damaged leading to loss of protection function
Solution Approach 1:
The thermal disconnector mechanism is pre-configured in the circuit before overheating occurs. When the overvoltage protection component overheats, the thermal disconnector automatically activates to form a bypass current path, diverting current away from the overheated component and preventing damage while maintaining circuit continuity and protection function.
2Reliability
If a thermal disconnector mechanism is added to bypass overheated components, then component damage is prevented, but the device complexity increases
Solution Approach 1:
The thermal disconnector mechanism acts as an intermediary component between the overvoltage protection component and the rest of the circuit. It monitors the thermal state of the protection component and automatically activates to create a bypass path when overheating is detected, thereby protecting the component 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
Enables safe and efficient operation by diverting 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 electrically conductive portion contacts and electrically connects the first and second bypass contacts to form the alternate second current path through the electrically conductive portion and the first and second bypass contacts
Implementation Method 3
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.