Inverter Semiconductor Switches for Emergency Capacitor Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inverter systems in electric and hybrid vehicles require additional components for emergency discharge, which increases costs and installation space, and may lead to overheating during capacitor discharge.
Innovation Solution
A control device for semiconductor switches that amplifies switching signals and regulates current, allowing semiconductor switches to operate in both switching and linear modes for emergency discharge without additional components, utilizing existing switches to rapidly and reliably discharge the intermediate-circuit capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components are used for emergency discharge, then discharge reliability is improved, but device complexity and cost increase
Solution Approach 1:
The semiconductor switches are designed to perform multiple functions: normal inverter operation in switching mode and emergency discharge in linear mode. The control device enables this dual functionality by selecting between switching signal amplification (for normal operation) and current regulation (for emergency discharge), eliminating the need for separate discharge components while maintaining reliability
Solution Approach 2:
The inverter's existing semiconductor switches serve the emergency discharge function without requiring external dedicated discharge circuits. By utilizing the inherent capabilities of the existing switches and controlling them in linear mode, the system performs self-service for emergency discharge, reducing device complexity while ensuring reliable discharge within five seconds
2Reliability
If additional components are used for emergency discharge, then discharge reliability is improved, but installation space increases
Solution Approach 1:
The semiconductor switches are designed to perform multiple functions: normal inverter operation in switching mode and emergency discharge in linear mode. The control device enables this dual functionality by selecting between switching signal amplification (for normal operation) and current regulation (for emergency discharge), eliminating the need for separate discharge components while maintaining reliability
Solution Approach 2:
The emergency discharge function is merged with the existing inverter structure by utilizing the same semiconductor switches and control circuitry. The control device integrates both switching signal amplification and current regulation capabilities, combining multiple functions into a single unified system that reduces installation space while ensuring reliable discharge
3Speed
If semiconductor switches operate in linear mode for discharge, then discharge speed is improved, but overheating risk increases
Solution Approach 1:
The control device monitors the discharge process and manages the linear mode operation periodically or in controlled intervals. By activating linear mode only when needed for emergency discharge and switching back to switching mode when appropriate, the system achieves rapid discharge while managing thermal accumulation through controlled operation cycles
Solution Approach 2:
The control device incorporates feedback mechanisms to monitor the discharge process and adjust the operation of semiconductor switches accordingly. By detecting current levels and thermal conditions, the control device can modulate the linear mode operation to achieve rapid discharge while preventing excessive temperature rise through real-time adjustments
4Device complexity
If existing semiconductor switches are used for emergency discharge, then device complexity is reduced, but discharge capability may be insufficient
Solution Approach 1:
The control device dynamically adjusts the operating mode of semiconductor switches based on system conditions. During emergency discharge, it transitions from standard switching mode to linear mode, enabling the existing switches to provide enhanced discharge capability without requiring additional components. The dynamic control ensures optimal power delivery while maintaining system simplicity
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
Enables emergency discharge within five seconds, eliminating the need for dedicated circuits, reducing costs and space requirements, and preventing overheating by leveraging existing semiconductor switches as current regulators.
Implementation Method 1
a current regulation means which is coupled with a current sensor output of the semiconductor switch and which is designed to generate a second switching control signal which drives the semiconductor switch in a linear mode
Implementation Method 2
a switching signal amplification means which is designed to amplify a switching signal generated by a control of the inverter and to generate a first switching control signal which drives the semiconductor switch in a switching mode
Data Source
AI summary
The invention relates to a control device for triggering a semi-conductor switch of an inverter, the control device comprising: a switching signal amplification device, which is designed to amplify a switching signal generated by a control regulation of the inverter, and to generate a first switching control signal that triggers the semi-conductor switch in a switching mode; a current regulation device, which is coupled to a current sensor output of the semiconductor switch and is designed to generate a second switching control signal that triggers the semi-conductor switch in a linear mode; and a selection device, which is coupled to the switching signal amplification device and the current regulation device and is designed to output, on the basis of at least one mode selection signal, either the first switching control signal or the second switching control signal in order to trigger a control terminal of the semi-conductor switch.