Y-Capacitance Energy Monitoring for EV On-Board Voltage Safety
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Solution Overview
Problem
Conventional methods fail to effectively monitor and manage the energy content in Y-capacitances of electrical on-board power supplies in vehicles, potentially leading to user safety risks due to the lack of voltage safety checks, especially in high-voltage systems like those found in 800 Volt vehicles.
Innovation Solution
A method and system for monitoring the Y-capacitance of an electrical on-board power supply, which determines the current energy stored based on capacitance and power supply voltage, compares it to predetermined safety thresholds, and generates signals to prevent exceeding these limits, using existing insulating monitors and software within the power supply or control units to ensure voltage safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Y-capacitances are designed with maximum energy storage capability, then electromagnetic compatibility is improved, but user safety deteriorates due to risk of electric shock
Solution Approach 1:
The system performs preliminary monitoring of the energy stored in Y-capacitances before it reaches dangerous levels. The control unit continuously measures capacitance values and calculates stored energy, enabling preventive action before electric shock risk materializes.
Solution Approach 2:
The system establishes a feedback loop where the control unit continuously monitors Y-capacitance energy storage and provides real-time feedback. When the stored energy approaches or exceeds safety thresholds, the system generates warning signals or activates discharge mechanisms to maintain safety.
2Reliability
If real-time monitoring of Y-capacitance energy is implemented, then voltage safety is improved, but device complexity increases
Solution Approach 1:
The control unit is designed to perform multiple functions: it manages the overall power supply control, monitors Y-capacitance values, calculates stored energy, and triggers safety mechanisms. This multi-functionality avoids the need for separate dedicated monitoring hardware, thereby limiting complexity increase.
Solution Approach 2:
The system uses its own existing control unit and measurement capabilities to monitor Y-capacitance energy, rather than requiring external or separate monitoring systems. The control unit leverages its inherent ability to measure electrical parameters to perform the safety monitoring function.
3Object-affected harmful factors
If Y-capacitance energy thresholds are strictly enforced, then user protection is improved, but productivity decreases due to power supply deactivation
Solution Approach 1:
The system takes preliminary protective measures by monitoring Y-capacitance energy before it reaches dangerous levels. By detecting and addressing potential issues in advance, the system can prevent situations that would require complete power supply shutdown, thereby maintaining productivity while ensuring safety.
Solution Approach 2:
The monitoring system operates periodically or continuously at controlled intervals, checking Y-capacitance energy levels and only triggering safety mechanisms when necessary. This periodic monitoring approach ensures user protection while minimizing disruptions to power supply availability and overall system productivity.
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
This approach enhances voltage safety by providing real-time monitoring and protection against electric shocks, effectively preventing user endangerment by deactivating the power supply or discharging the Y-capacitance when energy thresholds are exceeded, adhering to standards like ISO 6469-3 and SAE J 1772.
Implementation Method 1
at least one Y-capacitance (2, 3) of an electrical on-board power supply (1) is monitored. To this end, a current capacitance value of the at least one Y-capacitance (2, 3) and a current on-board power supply voltage UB of the electrical on-board power supply (1) are ascertained
Data Source
AI summary
A method for monitoring at least one Y-capacitance of an electrical on-board power supply of a vehicle includes ascertaining a current capacitance value of the at least one Y-capacitance and a current on-board power supply voltage of the electrical on-board power supply. The method further includes determining a currently stored amount of energy in the at least one Y-capacitance depending on the current on-board power supply voltage of the electrical on-board power supply and the current capacitance value of the at least one Y-capacitance of the electrical on-board power supply, comparing the currently stored amount of energy in the at least one Y-capacitance to a predetermined threshold value, and generating a control signal when the predetermined threshold value is exceeded in the comparing.