Semiconductor Device Gate Voltage Control for Peripheral Overheating
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Solution Overview
Problem
Semiconductor devices face overheating issues due to uneven heat transfer and timing delays in turning on/off, particularly in the peripheral regions, despite existing cooling techniques, as the heat dissipation rate is slow and temperature rises rapidly with excess current flow.
Innovation Solution
A semiconductor device with a gate region extending on its substrate, featuring multiple pads for selective gate voltage application, allowing for timed turn-on and turn-off voltage distribution to manage heat production and dissipation across different regions, thereby preventing overheating by optimizing voltage application points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the semiconductor device is turned off upon detection of excess current to prevent overheating, then current flow is stopped, but heat already produced cannot be dissipated quickly enough and overheating occurs before shutdown
Solution Approach 1:
The system performs preliminary cooling action by applying reduced voltage to the second gate region (peripheral) in advance before excess current detection becomes critical. This preemptive measure reduces heat generation in the vulnerable peripheral region before overheating occurs, buying time for the shutdown mechanism to activate effectively.
Solution Approach 2:
When excess current is detected, the system rapidly shuts down the semiconductor device by removing voltage from both gate regions. This rapid action skips through the intermediate state and quickly transitions to the off state, minimizing the time window during which overheating can occur.
2Productivity
If voltage is applied uniformly to the gate region, then the device operates normally, but regional temperature differences cause uneven heat dissipation and peripheral overheating
Solution Approach 1:
The voltage application timing is made dynamic rather than static. The control system adjusts the voltage application timing for different gate regions based on real-time operational conditions and detected temperature trends. During normal operation, both regions receive voltage simultaneously; during excess current conditions, the second gate region receives delayed voltage to dynamically adapt to thermal conditions.
Solution Approach 2:
The voltage application parameters (timing, duration) are changed based on operational conditions. Under normal conditions, standard voltage timing is applied to both gate regions. When excess current is detected, the voltage application to the second gate region is delayed, and the overall voltage duration is reduced, thereby changing the thermal profile and preventing peripheral 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
This solution effectively manages overheating by creating a time difference in turn-on and turn-off timings between central and peripheral regions, suppressing heat production and preventing overheating in the peripheral region, even with rapid temperature rise due to excess current, thus protecting the semiconductor device.
Implementation Method 1
adjusting voltage applied to the gate region changes resistance between the emitter region and the collector region
Implementation Method 2
heat produced in the semiconductor device to be transferred through the surface electrode to the lead frame
Data Source
AI summary
Two or more pads and are connected to a gate region, so that a pad for applying a gate voltage can be selected. In the case where, for example, the peripheral region is likely to overheat, a turn-on voltage is applied to the first pad to turn on the peripheral region later than the central region, and a turn-off voltage is applied to the second pad to turn off the peripheral region earlier than the central region. The problem that the peripheral region is likely to overheat can be addressed. In the case where the flow of an excess current raises the temperature, the turn-off voltage is applied to the second pad. The problem that the temperature is likely to rise in the peripheral region when an excess current flows can be addressed.