Parallel Switching Element Temperature Control
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Solution Overview
Problem
In semiconductor devices with power switching elements connected in parallel, temperature differences between elements lead to uneven current distribution and heat generation, limiting the use range of power switching elements and complicating circuit configurations for temperature adjustments.
Innovation Solution
A semiconductor device with a control unit and temperature estimation unit that stops the operation of the switching element with a higher temperature when a predetermined temperature difference is reached, simplifying the circuit configuration and reducing processing complexity by using discrete current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power switching elements are connected in parallel to drive larger current, then the current driving capability is improved, but temperature difference between elements increases causing uneven current distribution
Solution Approach 1:
The patent implements a feedback mechanism where temperature sensors monitor the temperature of each power switching element, and the control unit adjusts the drive signals based on detected temperature differences. When a temperature difference exceeds a predetermined threshold, the control unit reduces the drive signal to the higher-temperature element, creating a closed-loop feedback system that dynamically balances temperature and current distribution across parallel elements.
2Temperature
If temperature adjustment circuits are added to balance temperature between parallel elements, then temperature uniformity is improved, but circuit configuration becomes complicated
Solution Approach 1:
The patent merges the temperature control function with the existing drive circuitry by integrating temperature sensors and control logic into the current drive signal generation path. Instead of adding separate temperature adjustment circuits, the control unit combines temperature monitoring and drive signal modulation in a unified control architecture, reducing overall system complexity while achieving temperature balance.
3Temperature
If analog current adjustment is used to balance temperature, then temperature distribution is improved, but processing complexity and circuit scale increase
Solution Approach 1:
The patent changes the control parameter from continuous analog current adjustment to discrete drive signal modulation based on temperature threshold comparison. By converting the control approach to parameter-based discrete adjustment (reducing drive signal when threshold exceeded), the system achieves temperature balance with simpler processing logic and reduced circuit scale compared to continuous analog adjustment.
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 approach prevents overheating of individual switching elements, maximizes output currents, and simplifies the circuit configuration by reducing the need for complex analog current adjustments, thereby suppressing circuit scale increases and processing complexity.
Implementation Method 1
A semiconductor device with a control unit and temperature estimation unit that stops the operation of the switching element with a higher temperature when a predetermined temperature difference is reached
Data Source
AI summary
A semiconductor device includes a plurality of switching elements electrically connected in parallel with each other, a control unit that outputs a control signal for controlling a current supplied to each of the switching elements, and a temperature estimation unit that estimates a temperature difference between the switching elements. When an estimated temperature difference becomes equal to or higher than a predetermined threshold temperature, the control unit shifts an operation mode to a stop mode for stopping driving of a switching element having a temperature higher than the other.