Plug Blade Temperature Sensing in Leakage Protection Plugs
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Solution Overview
Problem
Existing leakage protection devices suffer from local overheating due to poor contact and line overload, leading to potential fires and safety hazards.
Innovation Solution
A leakage protection device with temperature sensors near plug blades, over-temperature protection modules, and a driving module to disconnect power when temperature or leakage thresholds are exceeded, along with self-test modules to ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If leakage protection devices are used to improve safety, then personal safety is protected, but local overheating occurs due to poor contact and line overload
Solution Approach 1:
The patent applies preliminary action by placing temperature sensors adjacent to plug blades before overheating causes damage. The sensors detect temperature changes in advance and trigger the driving module to disconnect power proactively, preventing the overheating from escalating into fires or shell melting.
Solution Approach 2:
The patent uses temperature sensors as intermediaries between the plug blades and the control system. These sensors act as mediators that convert thermal information into electrical signals, enabling the driving module to respond to temperature changes without direct contact with the heated components.
2Reliability
If temperature sensors are added to detect overheating, then over-temperature protection is improved, but device complexity increases
Solution Approach 1:
The patent merges the temperature detection function with the existing leakage protection structure. The temperature sensors, over-temperature protection module, and driving module are integrated into the same device housing, combining multiple protection functions (leakage detection and over-temperature protection) into a single unified system rather than separate devices.
Solution Approach 2:
The driving module serves multiple functions: it controls the switch module for power disconnection in response to both leakage fault signals and over-temperature fault signals. This multi-functional design reduces the need for separate control mechanisms for each protection function.
3Measurement precision
If independent temperature detection near plug blades is implemented, then detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by placing temperature sensors specifically adjacent to plug blades where overheating is most likely to occur. This localized detection approach focuses measurement precision on the critical areas rather than uniformly distributing sensors throughout the entire device, optimizing detection accuracy where it is most needed.
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
Accurately detects and prevents overheating, reducing safety hazards by quickly disconnecting power and ensuring reliable operation through independent temperature detection and self-testing.
Implementation Method 1
the first temperature sensor is arranged adjacent to the first plug blade and is configured to detect a temperature near the first plug blade, and the second temperature sensor is arranged adjacent to the second plug blade and is configured to detect a temperature near the second plug blade
Implementation Method 2
a leakage detection module, which is configured to detect a leakage current signal on the current-carrying lines and generate a leakage fault signal when the leakage current signal is detected or when the leakage current signal exceeds a preset threshold
Implementation Method 3
the first voltage divider element, which is coupled in series with the first temperature sensor; a second voltage divider element, which is coupled in series with the second temperature sensor
Data Source
AI summary
A leakage protection device includes: a switch module for controlling power connection between input and output ends of current-carrying lines; a leakage detection module for detecting a leakage current signal on the current-carrying lines and generating a leakage fault signal when the leakage current signal is detected or exceeds a preset threshold; an over-temperature protection module, including first and second temperature sensors, respectively located close to first and second plug blades to detect temperatures near them, to generate over-temperature fault signals when the detected temperature exceeds a preset threshold; a driving module for receiving the leakage fault signal and driving the switch module to disconnect the power connection in response thereto. The device can disconnect the power connection quickly when the temperature of a plug blade is too high to avoid danger, and has a high over-temperature protection accuracy.