Voltage Controlled Switching Element Driving Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driving devices for voltage-controlled switching elements in vehicles fail to effectively manage electrical surges at conduction control terminals, leading to increased losses and temperature rises due to sustained currents above threshold levels, which existing shutdown functions cannot handle.
Innovation Solution
A driving apparatus with voltage determining means to identify intermediate voltages and forcible switching-off means to promptly switch off switching elements when the voltage at the conduction control terminal is at an intermediate level, preventing excessive current flow and using soft-breaking discharge paths and off-state holding elements to manage transitions safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the voltage applied to the conduction control terminal is set to a high level to reduce switching element loss, then the current in the non-saturated area exceeds the threshold current and loss is reduced, but when some sort of failure occurs in the driving device, loss of the switching elements may become large and drastic temperature rise may be caused
Solution Approach 1:
The patent introduces an intermediate voltage level between the threshold voltage and the high operating voltage. When a failure is detected, the voltage is reduced to this intermediate level rather than completely shutting down, allowing the system to maintain a safe state while preventing the drastic temperature rise that would occur with complete shutdown. This intermediary voltage state acts as a buffer that protects the switching elements from excessive loss and temperature rise during failure conditions.
Solution Approach 2:
The patent dynamically adjusts the voltage applied to the conduction control terminal based on the operational state and detected failures. The voltage can transition between high level (normal operation), intermediate level (failure state), and low level (shutdown). This dynamic voltage adjustment allows the system to optimize performance during normal operation while automatically protecting against excessive loss and temperature rise when failures occur.
2Reliability
If the voltage at the conduction control terminal is maintained at an intermediate level, then the switching element remains in a state where loss is large, but the existing shutdown function cannot handle this condition because the current is maintained at a level equal to or less than the threshold
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors the voltage at the conduction control terminal and the operational state of the driving device. When an intermediate voltage state is detected, the system provides feedback to activate the forcible switching-off function. This feedback loop ensures that the system can detect the problematic intermediate voltage state and automatically respond by forcing the switching element to turn off, preventing sustained high loss conditions.
Solution Approach 2:
The patent prepares the forcible switching-off function in advance, ready to activate when an intermediate voltage state is detected. Rather than waiting for the system to naturally shut down, the preliminary preparation of the switching-off mechanism allows for immediate action when the problematic voltage state is detected, preventing the switching element from remaining in a high-loss state for extended periods.
3Reliability
If a forcible switching-off function is added to handle intermediate voltage states, then the reliability and loss suppression are improved, but the device complexity increases
Solution Approach 1:
The patent designs the driving device with multi-functional components that can operate in different modes. The voltage control mechanism serves both normal operation and failure protection functions. The forcible switching-off function is integrated into the existing driving circuitry rather than being a completely separate system, allowing a single device to handle multiple functions including normal voltage control, intermediate voltage detection, and forced shutdown, thereby minimizing the increase in overall device complexity.
Data Source
AI summary
An apparatus is provided to drive a voltage controlled switching element having a conduction control terminal. In the apparatus, it is determined whether or not voltage at the conduction control terminal is at a first voltage which is lower than a second voltage and which is equal to or more than a threshold voltage. The second voltage is a voltage provided when the switching element is in a normal on-state thereof. The threshold voltage is voltage at which the switching element is switched on. When it is determined that the voltage at the conduction control terminal is at the first voltage, the switching element is forcibly switched off.