Motor Control Module Power Supply Isolation for Overcurrent Failover
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Solution Overview
Problem
Conventional power supply systems for motor control modules are unable to maintain control and prevent sudden motor stoppages due to excessive current, which can lead to irreversible damage when a power supply loop has an excessively large current, necessitating a solution to ensure continuous power supply and active control of short circuits.
Innovation Solution
A power supply system with a first and second direct current power supply, a current limiting unit, and an isolation unit, where the second power supply loop is disconnected when the first power supply loop's current exceeds a threshold, allowing the second power supply to provide power through a third loop, ensuring continuous operation and preventing motor stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power supply loop is used to supply power to the motor control module, then the circuit configuration is simple, but when the power supply loop has excessively large current, the motor control module cannot operate normally and the motor suddenly stops
Solution Approach 1:
The power supply system is segmented into two independent power supply loops: a first power supply loop connecting the first direct current power supply to the motor control module, and a second power supply loop connecting the second direct current power supply to the motor control module. This segmentation allows the system to switch between loops when one experiences excessive current, preventing sudden motor stoppages while maintaining relatively simple circuit configuration.
2Reliability
If a second power supply loop is added in parallel to ensure continuous power supply when the first loop has excessive current, then the power supply reliability is improved, but the circuit configuration becomes more complex and redundant
Solution Approach 1:
A current detecting device is introduced as an intermediary to monitor the current in the first power supply loop. When excessive current is detected, the detecting device triggers a switching mechanism that activates the second power supply loop. This intermediary approach enables automatic failover without requiring complex manual intervention or redundant circuit design, balancing reliability improvement with circuit simplicity.
3Reliability
If the second power supply loop remains connected in parallel during normal operation, then the system has backup capability, but the second direct current power supply may be affected by the excessive current in the first loop
Solution Approach 1:
The system performs preliminary detection of excessive current in the first power supply loop before it can affect the second power supply loop. When excessive current is detected, the switching mechanism proactively disconnects the first loop and activates the second loop in advance, preventing the harmful effects of excessive current from propagating to the backup power supply. This preliminary action ensures the backup capability remains intact while protecting against current-related damage.
Data Source
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AI summary
This application provides a power supply system of a motor control module and a vehicle. The power supply system includes a first current limiting unit and an isolation unit. An output end of a first direct current power supply is coupled to a first input end of the isolation unit to form a first power supply loop with the isolation unit. A first output end of a second direct current power supply is coupled to one end of the first current limiting unit. The other end of the first current limiting unit is coupled to a second input end of the isolation unit to form a second power supply loop with the isolation unit. The second power supply loop is connected in parallel to the first power supply loop. The first current limiting unit is configured to disconnect the second power supply loop when a loop current of the first power supply loop is greater than a first preset current threshold. A second output end of the second direct current power supply is coupled to the motor control module. When the second power supply loop is disconnected, the second direct current power supply is configured to supply power to the motor control module to form a third power supply loop. In this application, the power supply system may supply power to the motor control module when any power supply loop has an excessively large current.