Driving Circuit for Semiconductor Switch Turn-On Speed
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Solution Overview
Problem
Current driving technologies for semiconductor switch elements, such as nitride-based transistors, have a fixed turn-on speed due to fixed square wave configurations, making it difficult to enhance the turn-on speed of these elements.
Innovation Solution
A driving circuit with a first and second voltage generating circuit, where the first voltage is higher than the second voltage, is used to drive the switch element. The first voltage is applied during a predetermined time interval to accelerate the turn-on speed, and the second voltage, which is lower than the first but higher than the threshold voltage, is applied during the remaining time interval to maintain a stable driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed square wave is used to drive the semiconductor switch element, then the driving circuit is simple, but the turn-on speed of the switch element cannot be enhanced
Solution Approach 1:
The driving circuit is divided into multiple voltage generating circuits (first voltage generating circuit, second voltage generating circuit, third voltage generating circuit) that operate at different stages of the switching period. Each circuit generates a specific voltage level for a predetermined time interval, segmenting the voltage generation function to achieve variable voltage output that enhances turn-on speed while maintaining circuit manageability
Solution Approach 2:
The driving circuit transitions from a fixed square wave to a dynamic voltage output that changes over time. The circuit outputs different voltage levels (first voltage, second voltage, third voltage) during different time intervals of the switching period, making the driving signal adaptive to the switching element's turn-on requirements
2Speed
If a higher voltage is applied continuously to speed up turn-on, then the turn-on speed increases, but the driving voltage becomes unstable after turn-on
Solution Approach 1:
The first voltage generating circuit applies a higher first voltage during an initial predetermined time interval at the beginning of the switching period to accelerate the turn-on process. This preliminary high-voltage action speeds up the transition while the subsequent voltage reduction ensures stability
Solution Approach 2:
The driving circuit changes the voltage parameter dynamically during the switching period. It transitions from a higher first voltage to a lower second voltage, and then to a third voltage, adjusting the voltage parameter according to the switching element's operational stage to achieve both fast turn-on and stable post-turn-on performance
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 approach allows for a faster turn-on speed of the switch element while ensuring a stable driving voltage after turn-on, improving the overall performance of the semiconductor switch element.
Implementation Method 1
The first voltage generating circuit includes a first comparator and a voltage divider circuit electrically coupled with the first comparator. The first voltage generating circuit is configured to generate a first voltage at the main output terminal during a predetermined time interval of a turn-on duration of a switching period.
Implementation Method 2
The first voltage generating circuit includes a first comparator and a voltage divider circuit electrically coupled with the first comparator.
Data Source
AI summary
A driving circuit includes a main output terminal electrically coupled to a switch element, a first voltage generating circuit and a second voltage generating circuit. The first voltage generating circuit is electrically coupled with the main output terminal. The first voltage generating circuit comprises a first comparator and a voltage divider circuit. The first voltage generating circuit is configured to generate a first voltage at the main output terminal during a predetermined time interval of a turn-on duration of a switching period. The second voltage generating circuit is electrically coupled with the main output terminal. The second voltage generating circuit is configured to generate a second voltage at the main output terminal during a remaining time interval of the turn-on duration of the switching period. The predetermined time interval is ahead of the remaining time interval, and the first voltage is higher than the second voltage.