High Voltage Detection Circuit Current Adjustment Module
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Solution Overview
Problem
High voltage circuits in new energy vehicles and battery packs face challenges in accurate failure detection due to increased insulation resistance and capacitance, leading to prolonged detection times and increased safety risks.
Innovation Solution
A high voltage detection circuit comprising a current adjustment module, a detection module, and a processor module that adjusts current in the high voltage circuit and determines switch unit malfunctions by analyzing detection signals, enabling faster failure detection and reducing safety risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the high voltage circuit uses increased insulation resistance and capacitance for safety, then the safety performance is improved, but the failure detection time is prolonged
Solution Approach 1:
The patent introduces a pre-charge switch and pre-charge resistor that activate before the main power switch closes. This preliminary action charges the circuit capacitors in advance through a controlled path, so when the main switch closes, the capacitors are already charged and do not cause prolonged detection delays. The pre-charge mechanism prepares the circuit state beforehand, resolving the contradiction between safety capacitance and detection speed.
Solution Approach 2:
The patent uses a pre-charge resistor as an intermediary component between the power source and the main circuit. This resistor provides a controlled charging path that limits current while charging capacitors, allowing safety capacitance to be maintained without causing excessive detection time. The intermediary resistor mediates between the conflicting requirements of safety (needing capacitance) and speed (needing fast detection).
2Speed
If the current in the high voltage circuit is increased to accelerate capacitor charging and discharging, then the detection speed is improved, but the energy consumption and safety risk increase
Solution Approach 1:
The patent employs dynamic current control through a current adjustment module that can vary the current magnitude based on detection needs. During normal operation, the current is limited to safe levels. During detection phases, the current is temporarily increased to accelerate capacitor charging/discharging for faster detection. This dynamic adjustment resolves the contradiction between speed and energy consumption by applying high current only when necessary.
Solution Approach 2:
The patent implements periodic detection cycles where high current is applied intermittently only during detection phases rather than continuously. The system alternates between normal operation mode (low current) and detection mode (high current), achieving fast detection capability while minimizing overall energy consumption. The periodic application of high current resolves the contradiction by limiting energy use to specific time windows.
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 allows for rapid detection of switch unit malfunctions in high voltage circuits, thereby reducing safety risks and improving detection speed by accelerating the discharging and charging of vehicle capacitors.
Implementation Method 1
a current adjustment module configured to be turned on or off to adjust a current in a high voltage circuit
Implementation Method 2
a first detection module configured to provide a detection signal and transmit the detection signal to a processor module
Data Source
AI summary
The present application provides a high voltage detection circuit and method. The high voltage detection circuit includes a current adjustment module configured to be turned on or off to adjust a current in a high voltage circuit, a first detection module configured to provide a detection signal and transmit the detection signal to a processor module and the processor module configured to determine whether a master positive switch or a master negative switch is in malfunction according to a desired operation state of the master positive switch, a desired operation state of the master negative switch and the detection signal.