Power Converter Load Index Evaluation for EV Charging Overload Prevention
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Solution Overview
Problem
Existing methods for determining the load index of a power converter in charging devices for electric vehicles are limited in their ability to accurately assess the dynamic operating conditions and respond effectively to changing loads.
Innovation Solution
A method and device that utilize a logging device to store multiple characteristics of the charging device and power converter, which are then evaluated by an evaluation device to determine a load index. This load index is used to trigger threshold-based notifications to superordinate decision devices, allowing for reactive adjustments to the power converter's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple characteristics are stored and evaluated to determine load index, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system divides the load assessment function into two separate modules: a logging device that stores multiple characteristics (voltage, current, temperature, etc.) and an evaluation device that processes these characteristics to determine the load index. This segmentation allows the system to maintain high measurement precision through comprehensive data collection while managing device complexity by distributing processing functions across separate components.
2Reliability
If dynamic real-time evaluation is performed, then reliability is improved, but use of energy increases
Solution Approach 1:
The logging device continuously stores operating characteristics in advance, preparing the data foundation before evaluation is needed. This preliminary data collection allows the evaluation device to perform rapid real-time load index determination without requiring intensive continuous computing, thus maintaining reliable thermal overload protection while reducing energy consumption during critical evaluation moments.
3Adaptability or versatility
If threshold-based notifications are implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system uses threshold values as adjustable parameters to trigger reactive adjustments in power converter operation. By monitoring the load index against predefined thresholds and triggering notifications when thresholds are reached, the system achieves adaptable operation without requiring complex control algorithms. The threshold parameters can be adjusted to match different operating conditions and requirements.
Data Source
AI summary
A device and a method for determining a load index of a power converter as part of a charging device for electrically operated vehicles. Included is a power converter which has power electronics switching equipment and a control device for controlling this, wherein a logging device stores a plurality, preferably at least three, particularly at least five, of characteristics of the charging device and in particular of the power converter, having an evaluation device, which evaluates the plurality of characteristics and determines the load index therefrom and, when a first threshold value of the load index is reached, transmits this information about this to a first superordinate decision device.