Three Phase Semi Converter feeding Separately Excited DC Motor: Large-kW motors are fed from 3-phase supply through three Phase Converters. In a three Phase Semi Converter, the ripple frequency of the motor terminal voltage is higher than that in the single-phase converter, as a result the filtering requirements for smoothing out the motor current are […]
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DC Motor Control through Converters: DC motor control is conveniently and efficiently achieved by phase-controlled converters wherein the ac input voltage is converted to a controlled dc output. The commutation process, the transfer of current from one thyristor to the other, in these converters is the inexpensive natural or line commutation. As, an incoming thyristor is
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Thyristor Control of Motors: Thyristor Control of Motors – A variety of thyristor control circuitry has been devised for use in motor control depending upon the type of supply (ac/dc) and the type and size of the motor. For dc motor control, controlled dc power from a constant voltage ac supply is obtained by means
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Types of Converters in Power Electronics: The different types of converters in power electronics are AC/DC Converters AC/AC Converters The Matrix Converter DC/DC Converters DC/AC Converters Control VSI Current Source Inverters (CSI) AC/DC Converters: AC DC Converters – The naturally commutated phase-controlled converter is a common type of controlled power electronic converter which has reigned
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What is Power Electronic Converter?: What is Power Electronic Converter? – Since the introduction of the thyristor, the Power Electronic Converter technology has progressed through intense technological evolution for the last four decades and has emerged into a multidisciplinary technology. With basic thyristors, the converters can be naturally commutated or force commutated type. In a
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Block Diagram of Electrical Drives | Advantages | Applications: Block Diagram of Electrical Drives – Invention of thyristor led to emergence of semiconductor drives in early sixties. The improvements in converters and development of new drive-control strategies, such as field oriented (or vector) control of ac drives, sliding-mode control, energy saving strategies, etc. brought about
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Recent Trends in Power Semiconductors: The recent trends in Power Semiconductors from application point of view show that MOSFETs and IGBTs are replacing BJTs almost completely while GTOs are currently being used for high V and power ratings (> 0.5 MVA), these are expected to be replaced by IGBTs and recently introduced IGCTs (integrated Gate
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MOS Controlled Thyristor (MCT) | Symbol | Equivalent Circuit: An MOS Controlled Thyristor (MCT) is a thyristor-like trigger-into-conduction device that can be turned on or off by a short pulse on the MOS gate. It is a high power, high frequency, low conduction drop switching device and shows a tremendous promise for next generation power
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Static Induction Thyristor (SITH) – Symbol and its Workings: An Static Induction Thyristor (SITH) or SI-thyristor is a self-controlled GTO-like on-off device commercially introduced in Japan in 1988. Similar device, known as field-controlled thyristors (FCT) or field-controlled diode (FCD), were developed in USA. The device symbol is shown in Fig. 11.10. It is essentially a
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Static Induction Transistor (SIT) | Symbol | Features: An Static Induction Transistor (SIT) is a high-power high-frequency device and is essentially the solid state version of triode vacuum tube. It was commercially introduced by Tokin Corp, Japan, in 1987. The device symbol is shown in Fig. 11.9. The triode-like characteristics make the device suitable, both
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