Integrated Adjustable Gate Resistor for Lower Switching Loss
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Solution Overview
Problem
Semiconductor devices face challenges in reducing switching loss while maintaining a simple configuration, as increasing carrier frequency reduces passive component size but increases switching loss, and high switching speed increases surge voltage, requiring complex configurations with external resistors and measurement circuits.
Innovation Solution
Incorporating a built-in gate resistor with an adjustable resistance value on the semiconductor substrate, connected between the gate electrode and gate pad, allowing for resistance adjustments based on element characteristics to optimize switching speed and reduce switching loss without adding complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the carrier frequency is increased to reduce passive component size, then the device size is reduced, but the switching loss increases
Solution Approach 1:
The gate resistor value is made dynamically adjustable during device operation. A controller selectively connects different resistor values (first gate resistor value and second gate resistor value) based on operating conditions, allowing the gate resistance to be optimized for both high-frequency operation and switching loss reduction, thereby resolving the contradiction between component size reduction and switching loss increase
2Loss of energy
If the switching speed is increased to reduce switching loss, then the switching loss is reduced, but the surge voltage increases
Solution Approach 1:
The gate resistor value is changed as a controllable parameter to manage the trade-off between switching speed and surge voltage. By selectively applying different gate resistor values, the system can optimize switching performance while keeping surge voltage within acceptable limits, thus resolving the contradiction between reducing switching loss and controlling surge voltage
3Object-affected harmful factors
If an external gate resistor and measurement circuit are added to manage surge voltage, then the surge voltage is controlled, but the device complexity increases
Solution Approach 1:
The gate resistor function is merged into the semiconductor device itself rather than being an external component. The controller integrated within the device selectively connects different gate resistor values, eliminating the need for separate external measurement circuits and resistors, thus controlling surge voltage while maintaining a simple configuration
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 adjustable gate resistor enables reduced switching loss with a simplified configuration, managing surge voltage within the semiconductor device's withstand limits, thereby improving efficiency and reducing manufacturing costs.
Implementation Method 1
a gate resistor having an adjustable resistance value... connected between the gate electrode and the gate pad
Data Source
AI summary
A semiconductor element includes an element having a gate electrode provided in a semiconductor substrate. The semiconductor substrate has an emitter electrode arranged on an upper surface and a collector electrode arranged on a lower surface. A gate pad is arranged at a different position from the emitter electrode on the upper surface. A gate resistor arranged on the upper surface has an adjustable resistance value, and is connected between the gate electrode and the gate pad.