Power Module Gate Current Control for Voltage Jump Mitigation
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Solution Overview
Problem
Voltage jumps in power modules due to large leakage inductances can exceed the overvoltage limits of semiconductor components, particularly under extreme operating conditions like high temperatures and currents, leading to potential damage.
Innovation Solution
The power module incorporates control electronics that monitor and adjust the gate current for semiconductor components based on status parameters such as temperature, current, and voltage, using pulse-width modulation to prevent overvoltage by reducing switching speed when necessary, and employs wide bandgap semiconductors like SiC and GaN for the semiconductor components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wide bandgap semiconductors are used to achieve short switching times, then switching speed is improved, but voltage jumps occur that exceed overvoltage limits of semiconductor components
Solution Approach 1:
The patent applies dynamics by making the gate resistance variable rather than fixed. The control electronics dynamically adjust the gate resistance value based on real-time monitoring of voltage, current, and temperature parameters. This allows the switching speed to be optimized under normal conditions while preventing voltage jumps under extreme conditions, thus resolving the contradiction between switching speed and voltage jump prevention.
Solution Approach 2:
The patent changes the parameter of gate resistance dynamically based on operating conditions. By monitoring status parameters (voltage, current, temperature) and adjusting the gate resistance accordingly, the system can adapt the switching characteristics to prevent voltage jumps while maintaining efficient operation. This parameter change approach directly addresses the contradiction by allowing the system to shift between different operating states.
2Loss of time
If gate current is increased to improve switching speed, then switching time is reduced, but voltage jumps become more frequent under extreme operating conditions
Solution Approach 1:
The patent implements feedback control by continuously monitoring voltage, current, and temperature parameters during operation. Based on this feedback, the control electronics dynamically adjust the gate resistance to prevent voltage jumps. The system uses the monitored status parameters to determine when to modify switching behavior, creating a closed-loop control system that balances switching speed with reliability.
Solution Approach 2:
The system performs self-protection by autonomously adjusting its own switching parameters based on monitored conditions. When extreme operating conditions are detected (high temperature, high current), the control electronics automatically modify the gate resistance to prevent damage, without requiring external intervention. This self-service mechanism ensures reliability while maintaining optimal performance under normal conditions.
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 prevents voltage jumps by controlling the gate current in response to operating conditions, thereby protecting semiconductor components and ensuring reliable operation of the power module.
Implementation Method 1
Due to the progress made in the field of power semiconductors, short switching times can be obtained using so-called wide bandgap semiconductors (semiconductors with large bandgaps), such as SiC and GaN.
Implementation Method 2
using pulse-width modulation to prevent overvoltage by reducing switching speed when necessary
Data Source
AI summary
A power module for operating a vehicle, in particular an electric vehicle and/or a hybrid vehicle, comprising numerous semiconductor components, which form at least one topological switch; an input contact for supplying an input current to the semiconductor components; a control electronics for controlling the semiconductor components, to generate an output current based on the input current; an output contact for outputting the output current; wherein the control electronics is configured to set a gate current for one of the semiconductor components based on one or more status parameters for the semiconductor component.