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The model based temperature control system examined in this paper increases the expected lifetime of IGBT power modules by decreasing the magnitude of temperature swings occurring during operation. In order to achieve this goal additional power losses are produced during low load conditions. This is carried out by presetting a reactive current. The three level neutral point diode clamped three phase...
This paper presents a broad bandwidth (DC to ∼50MHz) current sensor. It is inserted in the current conducting path and it has a low insertion inductance of about 1 nH due to a coaxial housing. The measurement procedure is based on HOKA principle using TMR sensors for the low frequency capture and a Rogowski coil for the high frequency capture. The HOKA principle combines both by analog signal processing.
For drive train efficiency optimization, an accurate but simple loss model of an interior permanent magnet synchronous machine (IPMSM) is proposed. In order to analyze different inverter topologies, switching frequencies and modulation techniques it is necessary that the loss model of the machine takes losses caused by harmonics into account. Considering harmonics and saturation effects, loss characteristics...
Z-source inverter (ZSI) combines the electrical function of a DC/DC converter and a three-phase inverter. This study deals with a three-level neutral-point-clamped (NPC) ZSI which brings an additional electrical potential. The benefit is the lower output current ripple of each phase. Due to the non-linear behaviour of the Z-source control path, designing an accurate and especially a dynamic control...
This paper presents a junction temperature controller which increases the reliability of IGBT power modules in power electronic applications without affecting the demanded output power. Power electronic applications have to deal with varying load conditions. These varying load conditions lead to temperature swings which lead to mechanical stress of common IGBT power modules. At low load conditions...
In automotive applications system reliability is of major importance. The Voltage Source Inverter (VSI) of a traction system is a reliability and lifetime limiting factor due to the limited temperature cycle capability of its switching devices, commonly IGBT-modules. Temperature swings caused by varying load conditions on the motor cause mechanical stress in the switching modules due to change in...
This paper presents investigations on the control block diagram of a multi-phase interleaved-switched inverter. Disturbing influences caused by the interleaved switching affect the desired simplicity of the block diagram. A possibility to eliminate these disturbances by a novel discrete-time decoupling network is presented and its functionality and advantage are approved by measurements.
Energy flow and consumption are critical in modern electric drive applications within the transportation industry. Reducing losses and hardware requirements ultimately lowers a vehicles overall cost while improving performance. This paper presents an optimal control solution to reduce energy losses by limiting the peak power demands on the battery by using the power electronic converter and bus capacitor...
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