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. The turn-off for the GTO is accomplished by the application of a large Such thyristors have been named gate turn-off (GTO) thyristors. On state voltage is 3.4V for 550A, 1200V GTO. The Gate Turn-Off Thyristor (GTO) 51. Turned on by applying positive gate signal. 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. • It is a bistable device. Thyristors are generally off by line commutation due to the natural behavior of the input ac line supply. Simply, SCR is a kind of Thyristor. 13 13 14 Advantages over SCRs. 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. 6. 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 . Controllable peak on-state current ITGQ is the peak value of on-state current which can be turned-off by gate control. GTO Symbol. 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). 5 THYRISTOR APPLICATIONS INFORMATION Gate control will be normally lost once switching occurs . 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. These gate turn-off thyristors are useful in a number of areas, particularly within variable speed motor drives, high power, inverters and similar areas. 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. Gate Turn-off Thyristors. Turned off by applying negative gate signal. Power MOSFETs - Insulated Gate Bipolar Transistors (IGBTs) - Basic Structure and VI Characteristics. GTO Turn-on and Turn-off Pulses 53. Protection, cooling and mounting techniques. GTOs Schematic representation 52. GATE-TURN-OFF THYRISTOR (GTO) Gerbang ini dapat dihidupkan dengan memberikan sinyal gerbang positif dan dapat dimatikan dengan memberikan gerbang sinyal negative. • The 3 terminals of a thyristor is known as Anode, Cathode and Gate. If positive pulse applied between the cathode and gate terminals, then the device will be turned ON. 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. 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