Battery Simulator Compensation Impedance for High-Frequency Testing
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Solution Overview
Problem
High-frequency testing of electrical machines and converters is unreliable due to significant deviations in voltage provided to the test item from the specified voltage by the simulation model, caused by the impedance of the connecting line, leading to potential damage or shutdown of the test item.
Innovation Solution
A compensation impedance is introduced to counteract the effects of line inductance in the connecting line, allowing adjustment of the source impedance visible to the test item to match the impedance specified by the simulation model, thereby eliminating deviations and ensuring reliable testing at high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible connecting line is used to connect the test item to the simulation unit, then the simulation unit can be positioned flexibly and does not need to be repositioned for each test, but the line inductance of the connecting line causes significant voltage deviations at high frequencies
Solution Approach 1:
The patent introduces a compensation impedance as an intermediary element in the connecting line to counteract the harmful inductive effects. This compensation impedance, consisting of a compensating resistor and compensating capacitor, acts as a mediator that cancels out the voltage deviations caused by the line inductance, thereby maintaining voltage accuracy while preserving the flexibility of the connecting line setup
Solution Approach 2:
The patent modifies the electrical parameters of the connecting line by adding compensation elements with specific resistance and capacitance values. These parameter changes are designed to counterbalance the inductive reactance of the connecting line at high frequencies, transforming the overall impedance characteristics to eliminate voltage deviations without changing the physical flexibility of the connecting line
2Productivity
If the simulation unit operates at high switching frequencies for fast-switching converter units, then testing efficiency is improved, but voltage fluctuations and deviations occur causing test item damage or shutdown
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the compensation impedance to counteract the harmful effects of high-frequency operation before they occur. The compensating elements are designed with specific values that anticipate and neutralize the voltage deviations and fluctuations that would otherwise cause test item damage or shutdown during high-speed testing
Solution Approach 2:
The compensation impedance serves as a protective intermediary between the simulation unit and the test item during high-frequency operation. It mediates the high-frequency signals, filtering out harmful voltage fluctuations while allowing the beneficial high-speed testing to proceed, thus protecting the test item from damage
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 compensation impedance effectively minimizes the influence of line inductance, allowing reliable testing of test items at frequencies above 300 Hz by adjusting the source impedance to match the original impedance of the simulation unit, thus simulating a direct connection without the connecting line.
Implementation Method 1
a compensation impedance for the compensation of an impedance as a consequence of a line inductance of the connecting line
Data Source
AI summary
The invention relates to a device for testing, in particular high-frequency testing, a test item, for example an electrical machine or a converter, comprising:a simulation unit for simulating an electrical energy accumulator using a simulation model; andan electrical connection line, via which the test item can be connected to the simulation unit; wherein the device comprises compensation impedance for compensating for an impedance in accordance with a line inductance of the connection line.