Switching Apparatus Intra-Inter Path Speed Control
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Solution Overview
Problem
Switching apparatuses face suboptimal performance due to the use of a single switching speed for both intra- and inter-current path commutation operations, leading to increased switching losses and voltage transients caused by differing commutation inductances between switching elements and passive current check elements.
Innovation Solution
A switching controller is implemented to adjust switching speeds independently for intra- and inter-current path operations, allowing for optimized performance by setting intra-current path switching speed to minimize switching losses and inter-current path switching speed to reduce voltage transients, with the option to synchronize speeds at low current levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single switching speed is used for both intra- and inter-current path commutation operations, then the device complexity is reduced, but the switching performance deteriorates due to increased switching losses and voltage transients
Solution Approach 1:
The switching controller is segmented into multiple independent control channels: a first control channel for controlling the first switching element and a second control channel for controlling the second switching element. Each channel can operate at independently adjustable switching speeds, allowing optimization of switching losses for each current path without increasing overall controller complexity through modular design.
Solution Approach 2:
The switching controller implements dynamic switching speed adjustment by providing different switching speeds for intra-current path commutation and inter-current path commutation operations. The controller dynamically selects appropriate switching speeds based on the commutation type, enabling optimization of switching performance under varying operational conditions.
2Ease of operation
If a single switching speed is used for both commutation operations, then the ease of operation is improved, but the switching performance deteriorates due to voltage transients
Solution Approach 1:
The control system is divided into separate control channels for different switching elements and commutation operations. This segmentation allows each channel to be optimized independently for minimizing voltage transients during its specific commutation type, while maintaining overall ease of operation through standardized control interfaces.
Solution Approach 2:
Different switching speeds are applied locally to different commutation operations: a first switching speed is used for intra-current path commutation and a second switching speed for inter-current path commutation. This local quality adjustment allows each operation to use the optimal switching speed for minimizing voltage transients, with the switching controller configured to select appropriate speeds based on the commutation type.
3Reliability
If different switching speeds are used for intra- and inter-current path commutation, then the switching performance is improved, but the device complexity increases
Solution Approach 1:
The switching controller is divided into independent control channels, each capable of operating at different switching speeds. This segmentation allows the controller to achieve optimized switching performance through multiple speed settings while maintaining manageable complexity through modular architecture and independent channel operation.
Data Source
AI summary
A switching apparatus (20) comprises first and second current paths, each current path configured to be capable of conducting an electrical current, the first current path including a first switching element (28) connected in parallel with a first passive current check element (30), the switching apparatus (20) further including a switching controller configured to selectively control the switching of the first switching element (28), wherein the switching controller is configured to selectively switch the first switching element (28) at a first intra-current path switching speed to commutate the electrical current between the first switching element (30) and the first passive current check element (32), the switching controller is configured to selectively switch the first switching element (28) at a first inter-current path switching speed to commutate the electrical current between the first and second current paths, and the first intra-current path switching speed is faster or slower than the first inter-current path switching speed.