EV Charging System Motor Power Cutoff Circuit
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Solution Overview
Problem
Current electric vehicle charging systems lack a power management design to safely disconnect the motor from its power source during charging, posing safety risks due to the absence of a power cutting-off circuit, which is essential for preventing hard acceleration.
Innovation Solution
A charging system comprising a rechargeable battery module, a motor driver, a power switch, and a control circuit that generates a control signal to stop motor power output when the battery is charging, ensuring safe disconnection by controlling electric power conduction between the battery and external power source based on potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a general charger is used for charging the battery module, then the charging function is simple and cost-effective, but the motor cannot be safely disconnected from its power source during charging
Solution Approach 1:
The patent combines the charging function and motor power cutoff function into a single integrated charger device. The charger includes both a charging circuit for charging the battery module and a power cutoff circuit for disconnecting the motor during charging, thereby eliminating the need for separate control systems and reducing overall system complexity while improving safety
Solution Approach 2:
The charger is designed as a multi-functional device that performs both charging and motor power cutoff operations. By incorporating multiple functions into a single device, the system achieves reliable motor disconnection during charging without proportionally increasing device complexity
2Object-affected harmful factors
If the motor remains connected to power source during charging, then the system structure is simple, but hard acceleration can occur causing safety hazards
Solution Approach 1:
The patent introduces a power cutoff circuit as an intermediary component between the battery module and the motor. This circuit includes a cutoff switch that is controlled to open during charging, thereby mediating the power flow to prevent the motor from receiving power and causing hard acceleration, while maintaining system safety
3Reliability
If a power cutting-off circuit is added to the charger, then motor safety during charging is improved, but the charger structure becomes more complex
Solution Approach 1:
The power cutoff circuit is merged with the charging circuit into a single integrated charger device. The cutoff switch is controlled by the charger's control unit, allowing safety functions to be incorporated without creating entirely separate control systems, thereby minimizing the increase in overall device complexity
Data Source
AI summary
A charging system for an electric vehicle is disclosed in the present invention. It includes a rechargeable battery module, a motor driver, a power switch, and a control circuit. The motor driver stops outputting electric power from the rechargeable battery when the control signal from the control circuit is received and keeps outputting electric power from the rechargeable battery when the control signal doesn't exit. The design of the present invention is in a series connection. It can not only be charged simultaneously, but also control the drive motor to stop running. Danger of hard acceleration of the motor due to charge can be avoided.