Thesis About Power Electronics

Thesis About Power Electronics-57
Samer Shisha, and my supervisor in Chalmers, professor Torbjörn Thiringer, for their support and guidance during the project.Furthermore I would like to thank the employees at Scania who have given me advices and ideas during the work.Environmental tests that can affect the power electronics, for example vibrations and chemicals, will not be included within the scope of this thesis.

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Since it seems that the failure were caused by the bond wires, longer time periods are needed if the test should be done to find when the modules fails because of solder delamination.

Also passive cycling should be investigated together with other types of tests such as vibration and chemical tests to investigate if the modules are suitable for operation in a heavy hybrid vehicle.

However, it would be possible to have smaller temperature swings but then the test would take too long time. Theory This chapter will give the necessary introduction to insulated gate bipolar transistor (IGBT) modules.

An IGBT is a semiconductor which can be explained as a combination of bipolar junction transistor (BJT), metal-oxide-semiconductor field effect transistor (MOSFET) and gate turn off thyristor (GTO).

Except from greenhouse gases, fossil fuel emissions have other effects on human health, which may lead to cancer and heart- and lung-dieses [2]. Hybrid and/or electric vehicles are a way to reduce these negative factors on human health, for example a bus which charge the batteries when breaking for a bus stop reduces the noise pollution as well as the air pollution Challange description Also truck and bus companies are now looking into hybridisation and electrification of their vehicles.

Since this is a relatively new technology for the industry, the electrical components needs to be tested in order to ensure reliability.

Keywords: Power electronics, IGBT, Diode, Active power cycling, Vehicle, Hybrid Acknowledgement The work of this thesis has been performed at Scania in Södertälje.

First, I want to thank my supervisor at Scania, Dr.

Since fossil fuels produce greenhouse gases, many companies within the transportation industry focus on introducing electric motors in their vehicles, either as hybrid or as fully electric vehicles.

Electric motors are in general more efficient than combustion engines and the electricity could be produced from sources with very low CO 2 -pollution.


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