Abstract
In order to increase the power rating of electric vehicles, insulated gate bipolar translator (IGBT) modules with multiple power terminals are usually adopted. The transient current sharing of the same polarity power terminals is related to the stray inductance in the branches of the bus-bar. Based on the laminated bus-bar of a three-phase inverter in the electric vehicles that consists of asymmetrical parallel branches, this paper investigates the transient current imbalance sharing caused by the asymmetrical stray inductance in the parallel branches of the bus-bar from the view of energy storing and releasing of stray inductance for the first time. Besides, the partial self-inductance and mutual-inductance model of the parallel branches is set up. Finally, a high-precision partial stray inductance measurement method is proposed, and the accuracy of the partial stray inductance model for asymmetrical parallel branches is verified by experimental tests.
Highlights
In recent years, electrical vehicles (EVs) have gained unprecedented evolution in consideration of the current energy crisis and environmental protection [1]
Due to the low stray inductance, the laminated bus-bar has been widely used in power electronics and converter products [5,6,7]
The high di/dt values produced during commutations by these new fast switching devices and diodes are currently the main source of conducted and radiated noise emissions, which usually interferes with nearby equipment through conduction or radiation [9,10]
Summary
Electrical vehicles (EVs) have gained unprecedented evolution in consideration of the current energy crisis and environmental protection [1]. In order to evaluate the stray inductance of the bus-bar and verify the modeling accuracy, many measuring methods have been proposed by scholars and engineers These include gap voltage measurement based on the IGBT turn-on process [18], time domain reflectometry (TDR) method [19], resonant capacitance measurement methods [6], stray inductance integral arithmetic extraction method for bus-bar based on turn-on/off transient process [20], network analyzer measurement [17], etc. All these methods mentioned above focus on the total stray inductance of the current communication loops rather than the partial inductance. Experimental evaluation of partial stray inductance extraction including direct and indirect measurement verifies the proposed model and measuring method
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