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1 | 2 | 3 | Next1 Citation With anode positive with respect to cathode, a thyristor can be turned on by any one of the following techniques : (a) Forward voltage triggering (b) gate triggering (c) dv/dt triggering (d)Temperature triggering (e)Light triggering. These methods of turning-on a thyristor are now discussed one after the other. (a) Forward Voltage Triggering : When anode to cathode forward voltage is increased with gate circuit open, the reverse biased junction J 2 will break. T, technorati.com
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Static V-I Characteristics of a Thyristor 1 Citation An elementary circuit diagram for obtaining static V-I characteristics of a thyristor is shown in Fig. 4.2 (a). The anode and cathode are connected to main source through the load. The gate and cathode are fed from a source E s which provides positive gate current from gate to cathode. Fig. 4.2 (b) shows static V-I characteristics of a thyristor. Here V a is the anode voltage across thyristor terminals A, K and I a is the anode current. Typical SCR V-I characteristic shown in Fig. 4.2 (b) r, technorati.com
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TERMINAL CHARACTERISTICS OF THYRISTORS 1 Citation Thyristor is a four layer, three-junction, p-n-p-n semiconductor switching device. It has three terminals ; anode, cathode and gate. Fig. 4.1 (a) gives constructional details of a typical thyristor. Basically, a thyristor consists of four layers of alternate p-type and n-type silicon semiconductors forming three junctions J1, J2 and J3 as shown in Fig. 4.1 (a). The threaded portion is for the purpose of tightening the thyristor to the frame or heat sink with the help of a nut. Gate terminal is u, technorati.com
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SWITCHING CHARACTERISTICS OF THYRISTORS DURING TURN-ON 1 Citation Static and switching characteristics of thyristors are always taken into consideration for economical and reliable design of converter equipment. Static characteristics of a thyristor have already been examined. In this part of the section; switching, dynamic or transient, characteristics of thyristors are discussed. During turn-on and turn-off processes, a thyristor is subjected to different voltages across it and different currents through it. The time variations of the voltage across a thyr, technorati.com
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SWITCHING CHARACTERISTICS OF THYRISTORS DURING TURN OFF 1 Citation Static and switching characteristics of thyristors are always taken into consideration for economical and reliable design of converter equipment. Static characteristics of a thyristor have already been examined. In this part of the section; switching, dynamic or transient, characteristics of thyristors are discussed. During turn-on and turn-off processes, a thyristor is subjected to different voltages across it and different currents through it. The time variations of the voltage across a thyr, technorati.com
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TWO-TRANSISTOR MODEL OF A THYRISTOR 1 Citation The principle of thyristor operation can be explained with the use of its two-transistor model (or two-transistor analogy). Fig. 4.15 (a) shows schematic diagram of a thyristor. From this figure, two-transistor model is obtained by bisecting the two middle layers, along the dotted line, in two separate halves as shown in Fig. 4.15 (b). In this figure, junctions J 1 - J 2 and J 2 -J3 can be considered to constitute pnp and npn transistors separately. The circuit representation of the two-, technorati.com
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THYRISTOR GATE CHARACTERISTICS 1 Citation The forward gate characteristics of a thyristor are shown in Fig. 4.9 in the form of a graph between gate voltage and gate current. Here positive gate to cathode voltage Vg and positive gate to cathode current Ig represent dc values. As gate-cathode circuit of a thyristor is a p-n junction, gate characteristics of the device are similar to that of a diode. For a particular type of SCRs, Vg-Ig characteristic has a spread between two curves 1 and 2 as shown in Fig. 4.9. This spread, or scatter, of, technorati.com
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1 Citation As stated before, Bell Laboratories were the first to fabricate a silicon-based semiconductor device called thyristor . Its first prototype was introduced by GEC (USA) in 1957. This company did a great deal of pioneering work about the utility of thyristors in industrial applications. Later on, many other devices having characteristics similar to that of a thyristor were developed. These semiconductor devices, with their characteristics identical with that of a thyristor, are triac, diac, silic, technorati.com
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1 Citation An MCT is a new device in the field of semiconductor-controlled devices. It is basically a thyristor with two MOSFETs built into the gate structure. One MOSFET is used for turning on the MCT and the other for turning off the device. An MCT is a high-frequency, high : power, low-conduction drop switching device. An MCT combines into it the features of both conventional four-layer thyristor having regenerative action and MOS-gate structure. However, in MCT, anode is the reference with respect t, technorati.com
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Latest Original and Free Ubuntu CD Available in Varanasi Uttar Pradesh 1 Citation Latest Original and Free Ubuntu Linux Software on 700 MB CD Available in Varanasi Uttar Pradesh - for your LATEST Laptop or Desktop or Server. Do you need to run the latest, original and best softwares in the world on your computer ? Is somebody telling you that white horses which keep stopping half way are the best WAY to go ? LokVidya IT Karyashala Evam Manthan - 2 - If you do not already have Ubuntu operating system and BSNL Broadband Internet Connection running on your com, technorati.com
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