Inverter Intermediate-Circuit Discharge for Component Aging Detection
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Solution Overview
Problem
Existing inverter units for electrically driven vehicles lack effective methods for determining aging, which is crucial for maintaining efficiency and reliability amidst increasing demand for cost-effective and efficient components.
Innovation Solution
The proposed inverter unit utilizes a predetermined switching sequence to create a short circuit in the intermediate circuit, generating thermal energy that is used to determine the aging of components by comparing temperature increases over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intermediate circuit is discharged using conventional methods, then the energy is dissipated without useful purpose, but the inverter unit cannot determine component aging
Solution Approach 1:
The patent converts the harmful thermal energy that would normally be dissipated during intermediate circuit discharge into a beneficial diagnostic tool. By intentionally generating controlled short-circuit currents that produce measurable thermal effects, the system transforms wasted energy into useful information about component aging and thermal path characteristics.
Solution Approach 2:
The inverter unit uses its own operational processes (intermediate circuit discharge) to generate the thermal energy needed for aging determination. The system serves dual purposes: discharging the intermediate circuit while simultaneously performing self-diagnostics on component aging without requiring external test equipment or separate measurement systems.
2Reliability
If thermal energy is introduced to determine aging, then component aging can be tracked, but temperature increase may affect safe operation
Solution Approach 1:
The patent applies partial action by introducing thermal energy in controlled, limited amounts through specific switching sequences rather than continuous operation. The short-circuit duration and frequency are carefully regulated to generate sufficient thermal signal for aging determination while staying within safe temperature limits for normal operation.
Solution Approach 2:
The system uses periodic switching sequences to generate thermal energy at specific intervals rather than continuously. This allows the inverter unit to perform aging measurements at predetermined moments while maintaining normal operational temperatures during intermediate periods, thus tracking aging without compromising safe operation.
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 method allows for continuous tracking of component aging, enhancing the reliability and efficiency of the inverter unit by identifying thermal path aging and ensuring safe operation through controlled discharging.
Implementation Method 1
the predetermined switching sequence is configured to generate a current drop in the intermediate circuit at a substantially constant change in order to introduce thermal energy, generated by a short circuit, into the inverter unit
Implementation Method 2
the introduced thermal energy can be deduced on the basis of the precise knowledge of the converted energy from the intermediate circuit
Data Source
AI summary
An inverter unit. The inverter unit includes: a switch; an intermediate circuit; and a component. The inverter unit is configured to switch the switch on the basis of a predetermined switching sequence in order to drain the intermediate circuit. The predetermined switching sequence is configured to generate a current drop in the intermediate circuit at a substantially constant change in order to introduce a thermal energy, generated by a short circuit, into the inverter unit in order to determine an aging of the component.