High-Voltage Interlock Circuit for Multi-Fault Detection
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Solution Overview
Problem
Existing high-voltage interlocking devices in new energy vehicles are limited in their ability to detect various faults in high-voltage components, primarily able to identify open-circuit faults, and lack comprehensive diagnosis for short power supply and short-ground faults.
Innovation Solution
A high-voltage interlocking device and method that utilize a combination of resistance modules and switch modules, along with a fault detection module, to determine faults by analyzing detection signals, enabling identification of short power supply, open-circuit, and short-ground faults through distinct voltage readings and signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple voltage application and collection scheme is used, then the device complexity is reduced, but the fault detection capability is limited to only open-circuit faults
Solution Approach 1:
The detection circuit is segmented into multiple independent detection paths: a first detection path with first and second resistance modules for detecting short power supply faults, and a second detection path with third and fourth resistance modules for detecting short ground faults. Each path can independently detect specific fault types, enabling comprehensive fault detection while maintaining clear functional separation in the circuit design.
Solution Approach 2:
The detection circuit achieves multi-functionality by integrating multiple detection capabilities into a single system. The same basic circuit topology (voltage application and collection) is used for detecting different fault types (short power supply, open circuit, short ground) by configuring different resistance modules and switching arrangements, allowing one system to perform multiple detection functions.
2Reliability
If multiple detection paths with different resistance modules are used, then comprehensive fault detection is achieved, but the device complexity increases
Solution Approach 1:
Multiple detection paths are merged into a single integrated detection circuit. The first detection path (with first and second resistance modules) and the second detection path (with third and fourth resistance modules) are combined in one circuit structure, sharing common elements like the voltage collecting module and control logic, thereby achieving comprehensive fault detection without proportionally increasing overall device complexity.
Solution Approach 2:
The circuit employs periodic switching of switch modules to activate different detection paths at different times. The switching module periodically connects different resistance modules to the voltage application and collection circuitry, enabling sequential detection of various fault types through time-multiplexed operation rather than requiring all paths to be simultaneously active.
3Measurement precision
If voltage is applied to detect faults, then fault identification is enabled, but the ability to distinguish between different fault types (short power supply, short ground, open circuit) is insufficient
Solution Approach 1:
Different resistance modules are assigned to different detection paths based on their specific detection requirements. The first and second resistance modules are configured with specific resistance values suitable for detecting short power supply faults, while the third and fourth resistance modules are configured for detecting short ground faults. This localized optimization of resistance values in different circuit regions enables precise differentiation between fault types.
Solution Approach 2:
The voltage collecting module serves as an intermediary that captures voltage signals from different detection paths and transfers them to the processing logic. This intermediary component enables the system to collect and compare voltage readings from multiple detection paths, facilitating accurate fault type identification by providing a centralized point for signal analysis and comparison.
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
Enhances fault detection comprehensiveness by accurately identifying normal, short power supply, open-circuit, and short-ground states in high-voltage components, improving safety and reliability in new energy vehicles.
Implementation Method 1
a first resistance module, an end of the first resistance module being connected to a first connection end of a first switch module, a first connection end of a high-voltage component under detection, and an end of a second resistance module respectively
Data Source
AI summary
The application provides a high-voltage interlocking device and method for detecting the high-voltage interlocking device. The high-voltage interlocking device includes a first resistance module; a first switch module, a second connection end of the first switch module being connected to a first reference potential through a third resistance module, and a control terminal of the first switch module being configured to receive a first driving signal, to enable the first switch module to be turned on or off; a second resistance module, another end of the second resistance module being connected to a second reference potential; a fourth resistance module; a second switch module, a second connection end of the second switch module being connected to a third reference potential through a fifth resistance module; a fault detection module, configured to determine a fault of the high-voltage component underdetection according to a first detection signal.