Insulated Gate Bipolar Transistor (IGBT): An Insulated Gate Bipolar Transistor (IGBT) is basically a hybrid MOS-gated turn on/off bipolar transistor that combines the features of MOSFET (voltage control features), BJT (fast acting features and high power capability) and thyristor. The device is also known as MOSIGT, COMFET (conductively modulated FET), or GEMFET (gain modulated FET), […]
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What is Power MOSFET?: What is Power MOSFET? – The power metal oxide semiconductor field-effect transistor (MOSFET) is a device derived from the field effect transistor (FET) for use as a fast-acting switch at power levels. Unlike the bipolar transistor which is current controlled, the MOSFET is a voltage controlled device. The main terminals are
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Darlington Transistor Working: Darlington Transistors Working – A Darlington-connected transistor pair is shown in Fig. 11.6. The current gain of the power transistor can be considerably improved if the base drive current is obtained from another transistor. This is called a Darlington arrangement. The driver transistor can be incorporated on the same silicon chip, with
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What is Power Transistor? | Definition | Working | Applications: What is Power Transistor? – Power Transistors are now available in ratings suitable for motor control. This device is a 3-layer p-n-p (or n-p-n) structure, as shown in Fig. 11.5. This type of transistor is known as a bipolar junction transistor (BJT). Working: In normal
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What is Silicon Controlled Rectifier (SCR)? | Construction and Working of SCR: What is Silicon Controlled Rectifier (SCR)? – This semiconductor switching device is also known as a thyristor. It is a 4-layer, 3-junction, bistable (ON and OFF) semiconductor switch. The terminal to the outer p-layer is the anode, the terminal to the outer n-layer
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What is Semiconductor Diode?: The Semiconductor Diode (Silicon Rectifier) described here in Fig 11.2(a) are based on the property of p-type and n-type materials in conjunction. An ideal diode presents zero impedance to current flow in one direction and infinite impedance in the opposite direction. A practical diode has a very low forward resistance and
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Motor Control by Static Power Converters: Motor Control by Static Power Converters – Power electronics is a multidisciplinary technology that encompasses power semiconductor devices, converter circuits, electric machines, signal electronics, control theory, microcomputers, very-large scale integration (VLSI) circuits, computer-aided design techniques, etc. Electrical power is processed by power electronics to make it suitable for various
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AC Series Motor: A series motor can be run from either dc or ac (single-phase) supply provided that both stator and rotor cores are laminated to limit the iron-loss. Figure 10.43 is the cross-sectional view of a AC Series Motor connected to ac supply. As the armature current alternates, the field polarity alternates in phase
Hybrid Stepper Motor Construction and Working: This is in fact a PM stepper motor with constructional features of toothed and stacked rotor adopted from the variable-reluctance motor. The stator has only one set of winding-excited poles which interact with the two rotor stacks. The permanent magnet is placed axially along the rotor in form of
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2 Phase 4 Pole Permanent Magnet Stepper Motor: Figure 10.39 shows the phases (stacks) of a 2 Phase 4 Pole Permanent Magnet Stepper Motor. The rotor is made of ferrite or rare-earth material which is permanently magnetized. The stator stack of phase b is staggered from that of phase a by an angle of 90°
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