High-Voltage Plug Monitoring Circuit for Wiring Fault Detection
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Solution Overview
Problem
Conventional electrical monitoring devices for high-voltage applications in motor vehicles can incorrectly determine if a plug is inserted into a receptacle due to faults in the electrical wiring, leading to potential safety issues and reduced operational reliability.
Innovation Solution
An additional electrical connection is introduced to allow the microcontroller to verify the integrity of the signal path from the microcontroller to the high-voltage connection unit, enabling the monitoring of both the plug-receptacle connection and the operational status of the monitoring device, using a comparison of signal sequences to differentiate between connection errors and device malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional monitoring device uses a single electrical connection to detect plug insertion status, then the device structure remains simple, but the reliability of monitoring is reduced due to inability to distinguish wiring faults from actual disconnection
Solution Approach 1:
The patent divides the monitoring function into two separate electrical connections: a first electrical connection for detecting plug insertion status and a second electrical connection for monitoring the operational status of the monitoring device itself. This segmentation allows independent verification of each function, enabling the system to distinguish between actual plug disconnection and monitoring device malfunctions, thereby improving monitoring reliability without excessive complexity increase.
Solution Approach 2:
The patent introduces an intermediary monitoring mechanism using the second electrical connection to verify the operational status of the monitoring device. This intermediary connection acts as a self-diagnostic tool that can detect whether the monitoring device is functioning correctly, serving as a mediator between the monitoring device and the high-voltage connection unit to ensure accurate status detection.
2Measurement precision
If the monitoring device lacks an additional electrical connection for self-diagnosis, then the device complexity remains low, but the measurement precision of connection status is reduced due to inability to detect signal path faults
Solution Approach 1:
The monitoring function is segmented into two distinct electrical connections with separate purposes: the first connection monitors plug insertion status while the second connection monitors the operational status of the monitoring device. This segmentation enables precise measurement of connection status by isolating the monitoring of signal path integrity from plug detection, improving measurement precision through functional separation.
Solution Approach 2:
The second electrical connection provides feedback information about the operational status of the monitoring device to the control unit. This feedback mechanism enables the system to detect and distinguish between actual plug disconnection events and monitoring device malfunctions, thereby improving the accuracy of connection status detection through continuous self-diagnosis.
Data Source
Figure 1
AI summary
The invention relates to an electrical monitoring device (1), in particular for a high-voltage application in a motor vehicle, in particular in an electric vehicle, - with an electrical high-voltage connection unit (2), having a plug (20) and a plug receptacle (21), in which the plug (20) can be received, - the high-voltage connection unit (2) having a high-voltage connection (4) which can be electrically connected or is electrically connected to a high-voltage electrical voltage source (3) and also having an electrical signal input connection (5) and an electrical signal output connection (6), the signal input connection (5) and the signal output connection (5) being designed in such a way that they are electrically connected to one another when the plug is accommodated in the plug receptacle and are electrically isolated from one another when the plug is not accommodated in the plug receptacle, - a microcontroller (10) having a signal output (12) electrically connected to the signal input terminal (5) via a first signal processing unit (11a) for providing an electrical output signal sequence generated by the microcontroller (10), and further having a signal input (13) electrically connected to the signal output terminal (6) via a second signal processing unit (11b) for processing an electrical signal sequence provided at the signal output terminal (6), - wherein the device (1) comprises an electrical connection (15) by means of which an electrical signal sequence provided at the signal input terminal (5) can be transmitted to the microcontroller (10).