Temperature-Adaptive Gate Drive for Semiconductor Switching Loss
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Solution Overview
Problem
Existing semiconductor devices face challenges in efficiently managing switching speed and loss at varying temperatures, often requiring additional circuits that increase circuit mounting scale.
Innovation Solution
A semiconductor device with a switching element, gate drive circuit, voltage output element, and drive capability control circuit that adjusts gate drive voltage based on temperature, using a thermoelectric or thermopile element to detect temperature and control drive capability, thereby reducing switching loss and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional temperature detection and control circuits are added to manage switching speed and loss, then temperature control capability is improved, but circuit mounting scale increases
Solution Approach 1:
The patent combines the temperature detection function and drive capability control function into an integrated circuit structure. The voltage output element detects temperature and directly outputs control signals to adjust gate drive voltage, merging what would traditionally be separate detection and control circuits into a unified system, thereby improving temperature control capability while minimizing circuit mounting scale
Solution Approach 2:
The drive capability control circuit serves multiple functions: it detects temperature through the voltage output element, processes temperature information, and dynamically adjusts gate drive voltage to control both switching speed and switching loss. This multi-functional design eliminates the need for separate dedicated circuits for each function, resolving the contradiction between control capability and circuit complexity
2Speed
If gate drive voltage is increased to maintain switching speed at high temperatures, then switching speed is maintained, but switching loss increases
Solution Approach 1:
The patent implements dynamic adjustment of gate drive voltage based on real-time temperature detection. The drive capability control circuit continuously monitors temperature through the voltage output element and dynamically modifies gate drive voltage to maintain optimal switching speed across varying temperature conditions, preventing the need for excessive voltage that would increase switching loss
Solution Approach 2:
The system changes the gate drive voltage parameter in response to temperature variations. By detecting temperature through the voltage output element and adjusting gate drive voltage accordingly, the system maintains switching speed performance while minimizing switching loss, as the voltage parameter is optimized for each temperature condition rather than using a fixed high voltage
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 reduces switching loss and maintains switching speed at high temperatures while minimizing circuit size by dynamically adjusting gate drive voltage based on temperature, thus simplifying the circuit configuration.
Implementation Method 1
a voltage output element configured to detect a temperature of the switching element when the switching element is driven and output a voltage corresponding to the temperature
Data Source
AI summary
A semiconductor device, including: a switching element having a gate; a gate drive circuit configured to drive the switching element; a voltage output element configured to detect a temperature of the switching element when the switching element is driven and output a voltage corresponding to the temperature; and a drive capability control circuit configured to control a drive capability of the switching element by changing a gate drive voltage to be applied to the gate of the switching element based on the voltage outputted by the voltage output element.