IGBT Drive Current and Switching Time Control for Stable Responsiveness
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Solution Overview
Problem
The variation in driving capability of switching elements based on load current leads to unstable operation due to varying responsiveness, which is exacerbated by high voltage variation ratios during turn-on and turn-off.
Innovation Solution
A semiconductor device with a state detection section, switching time adjustment section, and drive current adjustment section to detect and adjust the operation state and switching time of the switching element, ensuring consistent responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the driving capability of the switching element is increased to handle larger load currents, then the load current capability is improved, but the voltage variation ratio (dv/dt) increases causing unstable operation
Solution Approach 1:
The patent applies dynamics by making the drive current adjustable based on operation state. The drive current adjustment section dynamically changes the drive current magnitude according to the detected operation state, allowing the switching element to operate stably across different load conditions without fixed driving capability
Solution Approach 2:
The patent changes the drive current parameter based on operation state to control the voltage variation ratio. By adjusting the drive current magnitude, the system controls the dv/dt characteristics of the switching element, preventing excessive voltage variations that would cause unstable operation
2Productivity
If the driving capability is changed according to load current, then the responsiveness varies, but this causes instability in device operation
Solution Approach 1:
The patent implements feedback by using the state detection section to monitor the operation state and feed this information back to the drive current adjustment section. This closed-loop control allows the system to maintain stable operation by continuously adjusting the drive current based on actual switching element performance
Solution Approach 2:
The system dynamically adjusts the drive current based on operation state to maintain consistent responsiveness. Rather than allowing responsiveness to vary with load current, the dynamic adjustment compensates for these variations, keeping the switching element's responsiveness stable across different operating conditions
Data Source
AI summary
A semiconductor device capable of suppressing variations in responsiveness of a switching element even when the driving capability to drive the switching element is changed. The semiconductor device includes: an IGBT; a state detection section configured to detect the operation state of the IGBT; a switching time adjustment section configured to adjust a switching time of the IGBT according to the operation state detected in the state detection section; and a drive current adjustment section configured to adjust a drive current driving the IGBT according to the operation state detected in the state detection section.