Power Distribution Unit Fuse Triggering for High-Current Shutdown
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Solution Overview
Problem
Existing high-voltage DC switching devices in electric vehicles and energy storage applications lack the necessary switching and current carry capabilities to effectively manage overcurrent and short circuit events, posing risks to components and occupants.
Innovation Solution
Implementing a power distribution unit with contactors and active fuses, controlled by a microcontroller, that employs a dual-trigger mechanism: indirect triggering by the microcontroller at low current and direct triggering by a shunt current sensor amplifier at high current to ensure safe shutdown within an I2t limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single triggering mechanism is used for fuses, then the device complexity is reduced, but the response speed and reliability are insufficient to handle both low and high current events effectively
Solution Approach 1:
The triggering mechanism is segmented into two independent paths: a microcontroller-based indirect triggering path for low current events, and a shunt current sensor amplifier-based direct triggering path for high current events. This segmentation allows each path to be optimized for its specific operating range, improving overall reliability without requiring a single complex universal mechanism.
Solution Approach 2:
The microcontroller serves as an intermediary for low current events, processing signals and making intelligent decisions before triggering the fuse. For high current events, the system bypasses the microcontroller and uses the shunt current sensor amplifier as a direct intermediary, enabling ultra-fast response. This dual-intermediary approach resolves the contradiction by providing appropriate mediation speed for each event type.
2Measurement precision
If indirect triggering from microcontroller is used, then the control flexibility and current threshold determination accuracy are improved, but the response speed is too slow for high current events
Solution Approach 1:
The system dynamically selects the triggering path based on current magnitude. For low current events where precision is critical, the microcontroller's indirect triggering is used. For high current events where speed is critical, the system automatically switches to the direct triggering path through the shunt current sensor amplifier. This dynamic adaptation resolves the speed-precision contradiction.
Solution Approach 2:
The system changes the triggering parameter (response time threshold) based on the current event characteristics. Low current events allow longer response times for accurate microcontroller processing, while high current events trigger immediate action through the faster amplifier path. This parameter change strategy enables both precision and speed where appropriate.
3Speed
If direct triggering from shunt current sensor amplifier is used, then the response speed for high current events is improved, but the control flexibility and adaptability are reduced
Solution Approach 1:
The dual-triggering system provides multi-functionality: the microcontroller path handles low current events with intelligent control and adaptability, while the shunt amplifier path handles high current events with ultra-fast response. Both paths converge on the same fuse triggering mechanism, creating a universal system that adapts to different event types and charging scenarios (no charging, CCS charging, MCS charging).
Solution Approach 2:
The system applies partial action through the microcontroller for routine low current events where full speed is not critical, and excessive action (overkill speed) through the direct amplifier path for high current events where maximum speed is necessary. This partial-excessive strategy optimizes resource usage while ensuring safety.
Data Source
AI summary
Apparatuses and methods for implementing contactor opening and fusing strategies in a power distribution unit are disclosed, including a power distribution unit comprising: one or more contactors coupled to one or more charging systems; one or more active fuses in a circuit connecting the one or more contactors to a battery system; and a microcontroller configured to: receive one or more current values; determine whether the one or more current values meet a first set of predetermined current thresholds; in response to determining that the one or more current values meet the first set of predetermined current thresholds, trigger the one or more active fuses; determine whether the one or more current values meet a second set of predetermined current thresholds; and in response to determining that the one or more current values meet the second set of predetermined current thresholds, signal the one or more contactors to open.