The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Isolated DC-DC conversion with high power density is widely achieved by DC to high-frequency AC conversion, followed by isolation and high frequency rectification. Selection of high-performance diodes for such high-frequency rectification is challenging as a trade-off is often required among numerous conflicting parameters. Three high performance diodes, namely, an ultra-fast silicon diode, a super...
In this paper focus is to study various transition sub-intervals of an IGBT during switching events. The relationship of these transition duration with the switching voltage, device current and junction temperature is studied experimentally. This study is further extended to understand the effect of these time duration deciding the dead time between the switching of positive and negative devices in...
In this paper the focus is to study the switching characteristic of antiparallel diode in an IGBT module. The switching characteristic parameters reverse recovery time, peak reverse recovery current and corresponding energy loss during the diode turn-off transition are studied experimentally. The relationship of these characteristic parameters with the operating conditions, namely, switching voltage,...
Neutral point clamped (NPC) multilevel inverter fed high power drives, operating at low switching frequency, are prone to low-order torque pulsations. This paper considers a specific case of four switching angles per quarter cycle of the pole voltage. For such cases, apart from maintaining the fundamental component, three voltage harmonics can be eliminated. Consequently, only one torque harmonic...
Inverter dead-time, which is meant for safe commutation of devices is known to induce sub-harmonic oscillations in lightly-loaded induction motor drives operating in open-loop. This paper presents an experimental procedure to determine whether a given motor drive would exhibit such oscillations, and if yes, the region of such oscillatory behaviour. In particular, this paper presents case studies on...
In traction applications, power electronic converters experience wide variation in DC link voltage during operation. The purpose of this paper is to study the variations in turn-on and turn-off switching energy losses in the IGBTs with the DC link voltage. The IGBT switching characteristics are measured at various operating conditions, and turn-on and turn-off switching energy losses are determined...
Half-wave symmetry (HWS) and quarter-wave symmetry (QWS) are traditionally associated with high waveform quality of the inverter output voltage, particularly when the ratio of switching frequency to the modulating frequency (i.e. pulse number, P) is quite low. This paper investigates and establishes the possibility of high-quality pulse-width modulated waveforms with HWS, but without QWS, for P =...
Usually the top and bottom IGBT devices in an inverter leg are of the same make (i.e. from same manufacturer). At low power level, these two devices even may be contained in the same module. However at high power levels the top and bottom devices are in separate modules. Sometimes, in the event of device failure, device of particular make may be replaced by one of another make, but of same ratings...
Insulated gate bipolar transistors (IGBTs) are used in high-power voltage-source converters rated up to hundreds of kilowatts or even a few megawatts. Knowledge of device switching characteristics is required for reliable design and operation of the converters. Switching characteristics are studied widely at high current levels, and corresponding data are available in datasheets. But the devices in...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.