Parallel IPM Synchronization via Inter-Module Communication
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Solution Overview
Problem
Existing power semiconductor apparatuses with parallel-connected IPMs or switching devices face issues where protection circuits can inadvertently shut down one device while allowing another to continue operating, leading to potential damage and reduced lifetime.
Innovation Solution
A power semiconductor apparatus with transmission and reception circuits between IPMs, where a protection alarm signal generated by one module can transmit a communication signal to another module to stop its driving control operations, ensuring synchronized shutdown of both modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If IPMs are connected in parallel to increase power capacity, then the overall power capability is improved, but switching over unbalance between IPMs causes misdetection of overcurrent and heat concentration
Solution Approach 1:
The patent applies preliminary action by introducing delay circuits that pre-adjust the switching timing of each IPM based on their individual characteristics. The delay circuits compensate for switching speed differences before the actual switching occurs, ensuring synchronized operation of parallel IPMs and preventing switching over unbalance that would otherwise cause current distribution issues and heat concentration.
2Reliability
If delay circuits are used to synchronize switching between IPMs, then switching over unbalance is reduced, but the system complexity increases
Solution Approach 1:
The patent uses communication circuits as intermediaries to coordinate between IPMs and their protection circuits. Instead of complex direct coupling between all delay circuits, the communication circuits serve as mediators that transmit shutdown signals and synchronization information, simplifying the overall system architecture while maintaining switching synchronization and reducing the complexity of direct circuit interconnections.
Data Source
AI summary
A power semiconductor apparatus is provided with power controlling semiconductor modules connected in parallel to each other. Each power controlling semiconductor module controls driving of a power semiconductor device. The power semiconductor apparatus includes a transmission circuit and a reception circuit provided in one and another power controlling semiconductor modules, respectively. The transmission circuit transmits a predetermined communication signal to another power controlling semiconductor module based on a predetermined activation signal generated by one power controlling semiconductor module. The reception circuit receives the transmitted communication signal, and controls driving control operation of another power controlling semiconductor module based on the received communication signal.