Battery Pack Switch Retention Circuit for Fault Reset Hold
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Solution Overview
Problem
Existing battery packs may unintentionally disconnect electrical connections due to control device faults, leading to potential accidents, especially in high-speed operations.
Innovation Solution
A switch control device with a retention circuit that generates a trigger signal based on fault detection, producing a retention signal to maintain the switch state for a predetermined time, using components like capacitors, diodes, and transistors to stabilize the switch operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control device that controls the switch is reset due to a fault of the control device, then the control device can be restarted, but the electrical connection between the battery pack and the vehicle body may be unintentionally disconnected
Solution Approach 1:
The retention circuit is configured to maintain the driving signal at its previous level for a predetermined time period after a fault is detected. This preliminary action ensures that the switch control signal remains stable during the reset process, preventing unintentional disconnection before the control device fully restarts
Solution Approach 2:
The retention circuit acts as a cushioning mechanism by preserving the original driving signal state during fault conditions. This cushioning effect prevents sudden signal changes that could cause harmful disconnections, providing a buffer period while the control device recovers
2Reliability
If the battery pack is designed to include a retention circuit for maintaining the operating state of the switch, then safety is improved, but the device complexity increases
Solution Approach 1:
The retention circuit is integrated into the existing control device structure, merging the fault detection, signal retention, and switch control functions into a unified circuit architecture. This reduces overall system complexity compared to adding a separate standalone retention system
Solution Approach 2:
The retention circuit serves multiple functions: it detects faults, maintains the driving signal at previous levels, generates appropriate switch control signals, and provides timing control. This multi-functionality reduces the need for separate dedicated circuits for each function
Data Source
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AI summary
The switch control device may be provided. The switch control device includes: a retention circuit configured to generate a trigger signal based on a fault signal indicating whether a fault in a power signal occurred, generate a reset signal based on the trigger signal, pick a driving signal at an active edge of the trigger signal, and output the picked driving signal as a retention signal during a time set by the reset signal; and a driving circuit configured to generate a switch control signal based on the retention signal and the driving signal and output the switch control signal to a switch.