Leakage Current Detection Circuit for EV Charging Safety
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Solution Overview
Problem
Existing technologies lack effective methods to detect and respond to leakage current during the charging process of electric vehicles, posing safety hazards.
Innovation Solution
A current detection circuit that includes an excitation module and comparison module to determine leakage current in a magnetic induction coil, using feedback signals and reference signals to control the charging device's energy supply, thereby cutting off the loop and preventing hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no current detection circuit is installed, then the charging system operates without additional safety components, but leakage current cannot be detected and safety hazards cannot be prevented
Solution Approach 1:
The patent introduces a magnetic induction coil as an intermediary component that detects leakage current through magnetic field induction. The coil generates a feedback signal proportional to the leakage current, which is then processed by the comparison module to trigger safety responses, thereby enabling indirect but effective detection without direct contact with high-voltage circuits
Solution Approach 2:
The patent replaces complex electronic detection mechanisms with a magnetic induction-based detection system. By using the magnetic induction coil to convert leakage current into a detectable feedback signal, the system achieves reliable leakage detection through electromagnetic principles rather than direct electrical measurement, simplifying the overall detection architecture
2Speed
If traditional detection methods are used, then the system structure remains simple, but the response speed to leakage current is insufficient and safety cannot be ensured in real-time
Solution Approach 1:
The patent implements a feedback mechanism where the magnetic induction coil continuously monitors the charging circuit and generates a feedback signal that reflects the instantaneous leakage current status. This feedback signal is immediately compared against a reference signal by the comparison module, enabling real-time detection and rapid response to leakage conditions
Solution Approach 2:
The patent employs a comparison module that pre-establishes a reference signal representing safe operating conditions. By continuously comparing the feedback signal against this predetermined reference, the system is prepared to immediately identify and respond to leakage conditions the moment they occur, rather than requiring post-detection analysis
3Measurement precision
If a magnetic induction coil with feedback signal is used, then leakage current can be accurately detected, but the device complexity increases due to additional components
Solution Approach 1:
The patent combines the magnetic induction coil, feedback signal generation, and comparison functionality into an integrated detection circuit. By merging these components into a unified system where the coil's feedback signal directly feeds into the comparison module, the patent achieves accurate leakage detection while minimizing the overall component count and circuit complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables rapid detection and response to leakage current, enhancing safety and reliability by promptly stopping energy supply, with wide applicability across various geographical and climatic conditions.
Implementation Method 1
a magnetic induction coil; outputting an excitation signal to a first winding wound in the magnetic induction coil; and determining whether there is leakage current in a lead passing through the magnetic induction coil according to a feedback signal induced by the first winding
Data Source
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AI summary
A current detection circuit (20), a current leakage detection method and a charging system. The current detection circuit (20) is capable of outputting an excitation signal to a first winding (u1) wound in a magnetic induction coil (10), and then determining whether there is leakage current in a first lead (L0) passing through the magnetic induction coil (10) based on a feedback signal induced by the first winding (u1) and a reference signal, thereby determining whether there is an electric leakage while a charging device (101) supplies electric energy to the outside, and providing a determination result to a control circuit (103). When there is an electric leakage, the control circuit (103) can cut off a loop of the charging device (101) for supplying electric energy to the outside in time, so that the charging device (101) can stop supplying electric energy to the outside, thereby reducing the occurrence of hazards and improving the safety and reliability of the charging process. Meanwhile, the reaction speed for controlling the charging process can be increased to improve the timeliness. In addition, the application range of the current detection circuit (20) is greatly widened because it is not limited by geography or climate.