The Gate Turn-Off Thyristor (GTO) 51. Static, dynamic and thermal characteristics. 5 THYRISTOR APPLICATIONS INFORMATION Gate control will be normally lost once switching occurs . But SCR is the most widely used device, so the word Thyristor become synonymous to SCR. 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 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. Simply, SCR is a kind of Thyristor. GTO Symbol. • It is a bistable device. 6. The gate terminal controls the switches to be turned ON and OFF. 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. Turned on by applying positive gate signal. Power MOSFETs - Insulated Gate Bipolar Transistors (IGBTs) - Basic Structure and VI Characteristics. If positive pulse applied between the cathode and gate terminals, then the device will be turned ON. GTO working vi characteristics On state voltage is 3.4V for 550A, 1200V GTO. Controllable peak on-state current ITGQ is the peak value of on-state current which can be turned-off by gate control. The GTO is turned on in the same manner as the thyristor structures described early. Gate Turn-off Thyristors. The turn-off for the GTO is accomplished by the application of a large GTO Turn-on and Turn-off Pulses 53. Turned off by applying negative gate signal. 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. 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. Such thyristors have been named gate turn-off (GTO) thyristors. 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. Gate turn off Thyristors (GTOs) One of the special types of high power semiconductor devices is GTO (gate turn-off thyristor). These gate turn-off thyristors are useful in a number of areas, particularly within variable speed motor drives, high power, inverters and similar areas. Gate Turn-Off Thyristors - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Protection, cooling and mounting techniques. Thyristors, Static V-I Characteristics of SCR, TRIAC, GTO & IGBT, Turn-On & Turn-OFF Mechanism of SCR, Gate Turnoff Thyristor (GTO) .Power BJTs . 12. Thyristors are generally off by line commutation due to the natural behavior of the input ac line supply. 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). 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. 13 13 14 Advantages over SCRs. Thyristor Summary • • • A thyristor is a latching device and it can be turned on with a small gate pulse, typically 100μs . • The 3 terminals of a thyristor is known as Anode, Cathode and Gate. 550A, 1200V GTO controls the switches to be turned on in the same manner as the thyristor described. Peak on-state current which can be turned-off by gate control will be normally lost once switching occurs and off gerbang. 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