Conductor Overtemperature Detection Circuit With Adaptive Current Counting
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Solution Overview
Problem
Existing technologies face challenges in quickly and precisely estimating when the temperature of a conductor will exceed its limit, especially when the current intensity varies over time.
Innovation Solution
A method and circuit that measure the current flowing through a conductor, estimate differences between current levels and a current limit, and increment or decrement a counter based on these differences to generate an alert signal when a count limit is exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the current level is continuously monitored and a simple threshold comparison is used, then the device complexity is low, but the temperature estimation precision and response speed are insufficient when current varies over time
Solution Approach 1:
The patent applies dynamics by making the counter increment step size variable rather than fixed. The step size adapts dynamically based on the measured current level, allowing the system to respond more precisely to varying current conditions. When current exceeds the limit, larger step sizes enable faster temperature estimation, while smaller step sizes provide finer resolution when current is closer to the limit, thus improving measurement precision without requiring proportionally higher device complexity
Solution Approach 2:
The patent changes the parameter of counter increment step size based on the current level. By adjusting this parameter dynamically according to whether the current is significantly above or only slightly above the limit, the system achieves adaptive temperature estimation precision. This parameter change allows the same hardware to provide different levels of measurement detail based on operating conditions, resolving the contradiction between precision and complexity
2Speed
If a fixed counter increment step size is used, then the device complexity is low, but the response speed to detect potential overheating is insufficient when current varies over time
Solution Approach 1:
The system implements dynamic response by adjusting the counter increment step size based on the magnitude of current exceedance. When the current is significantly above the limit, the system uses larger step sizes to rapidly estimate temperature buildup, achieving faster response speed. This dynamic adjustment is implemented through programmable logic that modifies the increment value based on measured current levels, providing accelerated response when needed without permanently increasing device complexity
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple counter increment step sizes that correspond to different current exceedance levels. These step sizes are prepared in advance and selected based on the measured current, allowing the system to immediately respond with the appropriate speed without requiring complex real-time calculations. This preliminary preparation of response options enables fast reaction to overheating conditions while keeping the control logic relatively simple
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 allows for quick and precise detection of potential overheating in conductors, enabling timely intervention to prevent damage.
Implementation Method 1
As an electric current flows through a conductor, power dissipates according to the joule effect, which leads to an increase in temperature of the conductor
Data Source
AI summary
The present disclosure provides a method of detecting an excess temperature of a conductor. An example method includes measuring the level of current flowing through the conductor. The level is a first value during a first time period and a second value during a second time period. The first value being larger than a current limit and the second value being lower than the current limit. During the first period, estimating a first difference between the first value and the current limit, and incrementing a counter with a first step size selected as a function of the first difference. During the second period, estimating a second difference between the second value and the current limit, and decrementing the counter with a second step size selected as a function of the second difference. Generating an alert signal if a count value of the counter exceeds a count limit.