Charging Power Supply Fault Detection by Parameter Gradient
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Solution Overview
Problem
Existing power supply devices and energy storage systems, such as those used in electric vehicles, face challenges in preventing damage from excessive charging currents and voltages, and existing fuses react too slowly or require manual replacement, leading to inefficiencies and potential vehicle non-functionality.
Innovation Solution
A method that monitors the temporal gradient of charging parameters to detect faults earlier, allowing for rapid interruption of the power circuit before damage occurs, without needing to know the specific tripping characteristics of the fuse, and can adapt to different energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuses are used to interrupt the power circuit in the event of a malfunction, then the power circuit is protected from damage, but the reaction time is too long causing both the power supply device fuse and the electric vehicle fuse to blow
Solution Approach 1:
The control device performs preliminary monitoring of charging parameters (current, voltage, temperature) and their gradients before a fault develops. By detecting abnormal trends in advance and comparing them against threshold values, the system can trigger a switch-off signal to the power electronics before the fuse is forced to blow, thus preventing the time loss associated with fuse operation.
2Adaptability or versatility
If fuses with different tripping characteristics are used in different electric vehicles, then various vehicles can be charged, but the power supply device does not know the tripping characteristics and cannot protect the fuse
Solution Approach 1:
The control device continuously monitors charging parameters and receives feedback about the state of the energy storage device. By comparing the temporal gradient of charging parameters against threshold values, the system adapts its protection strategy without needing to know the specific fuse characteristics. This feedback mechanism enables universal compatibility while maintaining reliable protection across different electric vehicle types.
3Reliability
If the charging parameter itself is monitored to detect a fault, then a fault can be detected, but it is not possible to detect a fault earlier before the charging parameter reaches the threshold value
Solution Approach 1:
Instead of waiting for the charging parameter to reach a critical threshold, the control device performs preliminary detection by monitoring the temporal gradient of charging parameters. By analyzing how quickly parameters are changing and comparing this rate against threshold values, the system can predict potential faults before they materialize, enabling earlier intervention and preventing damage.
Data Source
AI summary
The invention relates to a method for operating an electrical power supply device for unidirectional or bidirectional charging of an energy storage device, whereina temporal charging parameter gradient of a charging parameter which is characteristic of the charging process is acquired during a charging process, whereinif a fault of the charging process is inferred on the basis of the charging parameter gradient, the emergency measure is carried out to protect the power supply device and/or the energy storage device from damage.The invention also relates to a switch-off control device for carrying out such a method and a power supply device with such a switch-off control device.