Semiconductor Thermal Control via Dual-Spot Temperature Monitoring
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Solution Overview
Problem
Semiconductor devices face overheating issues due to inrush currents and short-circuit scenarios, leading to potential damage as conventional temperature control methods fail to instantly cut off current flow in loads with inductive characteristics, causing further heating.
Innovation Solution
An electronic semiconductor device with temperature sensors at the hottest and coldest spots, a ΔT-detection block, and a logic and drive circuit that compares temperature differences and absolute temperatures to control current flow, dynamically adjusting a reference signal to prevent overheating by cutting off or reducing current flow when thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temperature control methods are used to shut down current flow when temperature limits are exceeded, then thermal damage can be prevented, but current flow cannot be instantly cut off in loads with inductive characteristics, causing further heating
Solution Approach 1:
The patent applies preliminary action by monitoring the temperature difference (ΔT) between hottest and coldest spots and predicting thermal stress before critical temperatures are reached. The control means compares ΔT to a predefined maximum value and proactively reduces or shuts off current flow before thermal damage occurs, rather than waiting for temperature limits to be exceeded. This predictive approach allows faster response to inductive load characteristics.
Solution Approach 2:
The patent implements feedback by continuously measuring temperatures at multiple spots, calculating the temperature difference, and using this information to dynamically control current flow. The control means receives temperature data, determines whether ΔT exceeds the maximum value, and adjusts current flow accordingly. This closed-loop feedback system enables rapid response to changing thermal conditions in inductive loads.
2Device complexity
If temperature monitoring is performed only at estimated hottest and coldest spots, then device complexity is reduced, but measurement precision of actual thermal stress is insufficient
Solution Approach 1:
The patent applies local quality by placing temperature sensors at specific locations (estimated hottest and coldest spots) where thermal extremes are most likely to occur. Rather than uniformly distributing sensors throughout the device, the invention focuses measurement capability on critical locations, achieving adequate thermal stress monitoring with minimal sensors while maintaining reasonable measurement precision.
Solution Approach 2:
The patent uses the temperature difference (ΔT) as an intermediary parameter to represent overall thermal stress. Instead of directly measuring complex thermal distributions throughout the device, the invention calculates ΔT from measurements at two strategic points, using this difference as a surrogate indicator of thermal stress that triggers appropriate control actions.
3Reliability
If current flow is reduced or shut off based on temperature difference and absolute temperature thresholds, then overheating is prevented, but productivity of the semiconductor device decreases
Solution Approach 1:
The patent applies dynamics by making current flow control adaptive rather than static. The control means dynamically adjusts current flow based on real-time temperature difference measurements and absolute temperature readings. When ΔT exceeds the maximum value or absolute temperature exceeds the threshold, current flow is reduced or shut off; when conditions improve, normal operation resumes. This dynamic control optimizes the balance between reliability and productivity.
Solution Approach 2:
The patent uses parameter changes by monitoring both the temperature difference (ΔT) and absolute temperature parameters. The control means compares these parameters against predefined thresholds (maximum ΔT value and absolute temperature threshold) and adjusts current flow accordingly. This multi-parameter monitoring enables nuanced control decisions that maintain productivity while preventing overheating.
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
Effectively prevents thermal damage by accurately monitoring and controlling temperature differences and absolute temperatures across semiconductor structures, reducing the risk of overheating and extending the lifespan of semiconductor devices.
Implementation Method 1
means for determining the temperature at the coldest and at the hottest spot of a semiconductor device
Implementation Method 2
each semiconductor device exhibits an ohmic resistance that burns some electrical power into heat
Data Source
AI summary
An electronic device includes a semiconductor structure. A first temperature sensor is located at a hot spot of the semiconductor structure and a second temperature sensor is located at a cold spot of the semiconductor structure. A control block is configured to control current flow through the semiconductor structure. For example, the control block is configured to cut off the current flow through the semiconductor structure when a temperature at the hot spot exceeds a first predefined threshold or when a temperature difference between the temperature at the hot spot and a temperature at the cold spot exceeds a second predefined threshold.