Semiconductor Electrode Thermal Management via Dynamic Gate Control
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Solution Overview
Problem
In semiconductor devices, especially those used in high-voltage large-current switching or in automobiles, heat dissipation from electrodes without a heat sink is challenging due to resin coverage, leading to potential temperature increases and the need for larger electrode sizes to manage heat.
Innovation Solution
A semiconductor device with a temperature sensing part that generates control signals to manage the gate voltage of the semiconductor element, ensuring the electrode temperature remains below a specified value, thereby allowing for a reduced electrode size without compromising temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electrode size is increased to dissipate heat, then the temperature control is improved, but the device size and complexity increase
Solution Approach 1:
The patent implements dynamic control of the semiconductor element's operation based on real-time temperature monitoring. The control unit adjusts the operating parameters of the semiconductor element dynamically to maintain electrode temperature within specified limits, replacing the static approach of oversizing electrodes with a dynamic adaptive control system.
Solution Approach 2:
The patent employs a feedback mechanism where temperature sensors continuously monitor the electrode temperature and feed this information back to the control unit. The control unit processes this feedback and adjusts the semiconductor element's operation accordingly, creating a closed-loop control system that maintains temperature within limits without requiring larger electrodes.
2Device complexity
If the electrode size is reduced, then the device complexity is decreased, but the temperature control becomes difficult to maintain
Solution Approach 1:
The patent replaces the mechanical/physical solution of increasing electrode size for heat dissipation with an electronic control solution. The control unit electronically regulates the semiconductor element's operation to control heat generation, substituting the need for large physical electrodes with intelligent electronic management.
Solution Approach 2:
The patent changes the operational parameters of the semiconductor element (such as current limits, duty cycles, or switching frequencies) based on temperature conditions. By dynamically adjusting these parameters, the system maintains temperature control with smaller electrodes, transforming the problem from a structural issue to a parameter management issue.
3Temperature
If heat dissipation structures are added to electrodes, then the temperature control is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the heat dissipation function from the electrode structure itself and relocates it to the control system. Instead of modifying the electrode's physical structure to enhance heat dissipation, the system extracts thermal management functionality to the control unit, which regulates heat generation at its source by controlling the semiconductor element's operation.
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
The solution effectively maintains electrode temperature within limits, enabling the reduction of electrode size while ensuring reliable heat management and performance.
Implementation Method 1
a temperature sensing part which senses the temperature of the electrode
Implementation Method 2
the temperatures of the semiconductor element and the component parts are measured with thermocouples
Data Source
AI summary
A semiconductor device includes a semiconductor element having a gate and controlled with a gate voltage, a gate drive circuit which controls the gate voltage, an electrode connected to the semiconductor element, a principal current in the semiconductor element flowing through the electrode, a temperature sensing part which senses the temperature of the electrode, a generation section which generates, on the basis of the temperature sensed by the temperature sensing part, a first control signal for giving a maximum amount of energization to the semiconductor element in such a range that the temperature of the electrode does not exceed a predetermined temperature, and a comparison section which compares the first control signal and a second control signal transmitted from the outside for the purpose of controlling the gate voltage, and selects a selective control signal which is one of the control signals with which the temperature of the electrode can be limited. The gate drive circuit controls the gate voltage according to the selective control signal.