Motor Control Module Power Supply Isolation for Short-Circuit Continuity
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Solution Overview
Problem
Conventional power supply systems for motor control modules in vehicles fail to maintain power delivery when a power supply loop experiences excessively large currents, leading to uncontrollable motor stops and potential irreversible damage.
Innovation Solution
A power supply system with a first and second direct current power supply, including a current limiting unit and an isolation unit, which disconnects the second power supply loop when the first power supply loop's current exceeds a threshold, allowing the second power supply to maintain power delivery through a third loop, enabling the motor control module to actively control short circuits and prevent sudden stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single power supply loop is used to supply power to the motor control module, then the system structure is simple, but when the power supply loop has excessively large current, the power supply system cannot normally supply power to the motor control module, causing the motor to become uncontrollable
Solution Approach 1:
The power supply system is segmented into multiple independent power supply loops (first power supply loop with first DC power supply, second power supply loop with second DC power supply). Each loop can independently supply power to the motor control module through the isolation unit, ensuring that if one loop fails due to excessive current, the other loop can take over to maintain power supply reliability.
Solution Approach 2:
The system prepares backup power supply capability in advance by configuring multiple power supply loops and current limiting units. When excessive current is detected in one loop, the current limiting unit disconnects that loop, and the isolation unit automatically switches to the other power supply loop, providing prior cushioning against power supply failures and preventing motor uncontrollability.
2Reliability
If the second power supply loop remains connected when the first power supply loop has excessively large current, then the system structure is simple, but the second direct current power supply is affected by the loop current of the first power supply loop, potentially causing system failure
Solution Approach 1:
The isolation unit acts as an intermediary between the first and second power supply loops. It electrically isolates the two loops while allowing automatic switching of power supply sources. When the first loop has excessive current, the isolation unit disconnects the first loop from the motor control module and switches to the second loop, preventing the excessive current from affecting the second power supply while maintaining continuous power supply.
Solution Approach 2:
The current limiting unit continuously monitors the current in the first power supply loop and provides feedback control. When the loop current exceeds the preset threshold, the current limiting unit triggers disconnection of the first power supply loop through the isolation unit, preventing the excessive current from affecting the second power supply loop and ensuring power supply stability.
Data Source
AI summary
This application provides a power supply system for 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. Another 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.