be designed to turn on and turn off the current flow under control by a gate signalin a DC circuit was motivated by this need. On state voltage is 3.4V for 550A, 1200V GTO. The gate terminal controls the switches to be turned ON and OFF. Thyristors, Static V-I Characteristics of SCR, TRIAC, GTO & IGBT, Turn-On & Turn-OFF Mechanism of SCR, Gate Turnoff Thyristor (GTO) .Power BJTs . GATE-TURN-OFF THYRISTOR (GTO) Gerbang ini dapat dihidupkan dengan memberikan sinyal gerbang positif dan dapat dimatikan dengan memberikan gerbang sinyal negative. GTOs Schematic representation 52. Controllable peak on-state current ITGQ is the peak value of on-state current which can be turned-off by gate control. But SCR is the most widely used device, so the word Thyristor become synonymous to SCR. If positive pulse applied between the cathode and gate terminals, then the device will be turned ON. 12. Simply, SCR is a kind of Thyristor. Power MOSFETs - Insulated Gate Bipolar Transistors (IGBTs) - Basic Structure and VI Characteristics. GATE C TR1 R TR2 OFF STATE ON STATE BREAKOVER VOLTAGE, CURRENT REVERSE-BLOCKING STATE REVERSE BREAKDOWN THIRD QUADRANT ANODE-FIRST QUADRANT ANODE+ V I HOLDING CURRENT +V 1 b a CATHODE TERMINAL. Thyristors are generally off by line commutation due to the natural behavior of the input ac line supply. 6. Tegangan keadaan on dari thyristor 2200 A, 1800 V, dan waktu turn off sangat cepat, sekitar 3 sampai 5 µs, biasa dikenal sebagai asymmetrical thyristor (ASCRT). Gate Turn-Off Thyristors - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Thyristor includes many types of switches, some of them are SCR (Silicon Controlled Rectifier), GTO (Gate Turn OFF), and IGBT (Insulated Gate Controlled Bipolar Transistor) etc. Turned off by applying negative gate signal. The turn-off for the GTO is accomplished by the application of a large Protection, cooling and mounting techniques. gate metallization J 3 J 2 J anode 1 cathode gate GTO (Gate Turn-off Thyristor) Construction GTO circuit symbol • Unique features of the GTO. The GTO is turned on in the same manner as the thyristor structures described early. Turned on by applying positive gate signal. • The 3 terminals of a thyristor is known as Anode, Cathode and Gate. Gate turn off Thyristors (GTOs) One of the special types of high power semiconductor devices is GTO (gate turn-off thyristor). 5 THYRISTOR APPLICATIONS INFORMATION Gate control will be normally lost once switching occurs . GTO Symbol. Types of Thyristors • There are four major types of thyristors: Silicon Controlled Rectifier Gate Turn-off Thyristor (GTO) &Integrated Gate Commutated Thyristor (IGCT) MOS Controlled Thyristor (MCT) Static Induction type Thyristor 7. The Gate Turn-Off Thyristor (GTO) 51. GTO working vi characteristics Static, dynamic and thermal characteristics. These gate turn-off thyristors are useful in a number of areas, particularly within variable speed motor drives, high power, inverters and similar areas. GTO Turn-on and Turn-off Pulses 53. It is similar to the gate turn-off (GTO) thyristor, but much less drive power is needed to turn off the MCT because little current flows into the gate. Gate Turn-off Thyristors. • It is a bistable device. 13 13 14 Advantages over SCRs. Such thyristors have been named gate turn-off (GTO) thyristors. Thyristor Summary • • • A thyristor is a latching device and it can be turned on with a small gate pulse, typically 100μs . Structures described early controllable peak on-state current ITGQ is the peak value of on-state current which can turned-off! - Insulated gate Bipolar Transistors ( IGBTs ) - Basic Structure and characteristics. 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