It has no cathode terminal, one of the three is gate and the others are A 1 (MT1 i.e. ; V DRM is the maximum repetitive peak voltage (usually the maximum peak voltage of the applied AC wave) that can be reliably tolerated. Experiment 5 Registration No. Fig. Note that the 2N3819 uses the pin out shown at left. Triac Characteristics Apparatus with Regulated Power Supplies Objective:- To study the MT Characteristics with Gate Signal in all the 4 Quadrants.Features:- Instrument comprises of Two DC Regulated Power Supplies 0-15VDC/150mA & 0-5VDC/150mA, three round meters for voltage & current measurement Triac mounted behind the panel, connections of Supplies & Triac brought out at 4mm … 2. SCR Characteristics 3 2. IGBT Characteristics 17 5. The triac also … NV6532 TRIAC Characteristic Trainer 2. Aim: To study the V-I characteristics of TRIAC. Fig. iv List of Experiments Exp No Experiment Nmae Page No 1 Static characteristics of SCR and DIAC. S. No. 8-1(f). The circuit above shows a simple DC triggered triac power switching circuit. 4 – (a) PNP Structure (b) I-V Characteristic Curve. Other layers are called the drift and the body region. Experiment (1) characteristics of the thyristor Experiment aim To study and plot the characteristics of the thyristor. TRIAC switch The TRIAC (Triode AC) model is designed using two anti-parallel SCR switch models as shown below. MOSFET Characteristics 15 4. 6-12(a) and attaching 2 main electrodes and 1 gate electrode. Use the Curve Tracer to find the transfer characteristics of a 2N3819 JFET. (LC Commutation Circuit) Oscillation Chopper Circuit 29 8. TRIAC Characteristics 9 3. 6.3.2 illustrates the main characteristics of the triac. An elementary circuit diagram for obtaining static V-I characteristics of a thyristor is shown in Fig. The two junctions are labeled J 1 and J 2.Figure below show the structure of n-channel IGBT. Voltage at terminal MT 2 is positive with respect to terminal MT 1 and gate voltage is also positive with respect to first terminal. The circuit symbol and schematic construction of one such device are shown in fig.1. To obtain V-I characteristics and to find on-state forward resistance of given SCR. Let us consider PNP structure where terminals MT1 and MT2 are connected to P1 and P2 outer layers respectively and are separated by N layer. Apparatus 1. With switch SW1 open, no current flows into the Gate of the triac and the lamp is therefore “OFF”. Introduction to Triac-Its construction and Operation The triac is another three-terminal ac switch that is triggered into conduction when a low-energy signal is applied to its gate terminal. Protection, cooling and mounting techniques. Two DC power supply Introduction A thyristor is a four-layer p-n-p-n semiconductor device consisting of three p-n junctions. Plot the transconductance of this JFET. 1 Thyristors DC Characteristics PREPARED BY: J.B. G. Ibarra 1.0 OBJECTIVES 1.1 To become familiar with the characteristics of the (SCR) silicon controlled rectifier and its operation. Experiment: 3 Study of TRIAC Characteristics Objective: 1. ; V GT is a range of gate voltages that will trigger conduction. Show your calculations for voltage with firing angle in reading 3 Show your calculations for voltage with firing angle in reading 7 Sketch the variation of output voltage with firing angle. Experiment 4 : TRIAC Characteristic Theory. Plot the graph of VORMS v/s 〈. VI CHARACTERISTICS OF MOSFET 14 4. We will discuss the operation of this circuit in the description of experiment circuit section. RC Triggering Circuit – HWR & FWR 19 6. Apparatus Required: 1. Two AVO meter 4. Output Power Characteristics Phase control is the most common form of Thyristor power control. This allows the component to conduct in both directions. ☞Set both voltages to minimum position, and then switch on SPDT. The anode and cathode are connected to main source through the To study the V-I characteristics of TRAIC. The first quadrant is the region wherein MT2 is positive w.r.t MT1 and vice-versa for the third quadrant. Experiment no. Thyristors, Static V-I Characteristics of SCR, TRIAC, GTO & IGBT, Turn-On & Turn-OFF Mechanism of SCR, Gate Turnoff Thyristor (GTO) .Power BJTs . The characteristics of a TRIAC are similar to those of an SCR, both in blocking and conducting states, except for the fact that SCR conducts only in the forward direction, whereas the TRIAC conducts in both the directions. The triac characteristics is similar to SCR but it is applicable to both positive and negative triac voltages. The bridge rectifier, D1 to D4, provides a pulsating dc form the 18V ac voltage. OBJECTIVE In this lab, you will study the I-V characteristics and small-signal model of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET). EED 306. Zener 2. The Thyristor is held in the off condition -- that is, all current flow in the circuit is blocked by the Thyristor except a minute leakage current. 10.Conduct an experiment to produce variable DC o/p voltage (chopper), plot o/p voltage v/s duty cycle for Variable frequency & Fixed Frequency. Triac Characteristics Apparatus with Regulated Power Supplies Objective:- To study the MT Characteristics with Gate Signal in all the 4 Quadrants.Features:- Instrument comprises of Two DC Regulated Power Supplies 0-15VDC/150mA & 0-5VDC/150mA, three round meters for voltage & current measurement Triac mounted behind the panel, connections of Supplies & Triac brought out at 4mm … 05-09 3 Controlled HWR and FWR using RC triggering circuit 10-14 4 UJT firing circuit for HWR and FWR circuits 15-20 5 Generation of firing signals for thyristors/ trials using digital circuits / microprocessor. 6-12(b) is the symbol for triac. TRIAC Characteristics Experiment Our light sources such as tube lights have their power rating. If the supply voltage is increased from zero, a point reached (point A) when the SCR starts conducting. If high brightness is required, high watt bulb would have to play its role and vice versa. To study the TRIAC based AC/AC regulator or 1-Phase AC voltage controller using TRIAC Apparatus or Components: 1. Experiment No: 2 Experiment Name: Study of V- I Characteristics of TRIAC. 2. UJT Triggering of SCR – HWR & FWR 33 9. The characteristics curve is shown in the below Diagram. Power Electronics. Power MOSFETs - Insulated Gate Bipolar Transistors (IGBTs) - Basic Structure and VI Characteristics. TRIAC have five layer and three terminals, the name TRIAC comes from its three electrodes (terminals) shown in fig9. 1.2 To measure the gate trigger voltage and the holding current of a typical SCR by using dc measurement methods. To determine holding, latching current and break over voltage of given SCR. A small leakage current, called the forward leakage current, flows as shown by OM in the V-I characteristics of SCR in this mode.As the forward leakage current is small, SCR offers high impedance. The term IGBT is a semiconductor device and the acronym of the IGBT is insulated gate bipolar transistor. Experiment -3. cathode, the curve between V and I is called the forward characteristics. Objective : To study the MT Characteristics with Gate Signal in all the 4 Quadrants. The invention of the TRIAC was necessitated because of the need for controlling power fed to ac loads. THEORY: - TRIAC is one of the bidirectional devices of thyristor family. Nvis 6530A Understanding Characteristics of DIAC, TRIAC & SCR is remarkable and frequently used laboratory equipment which is designed to explain fundamentals and working of DIAC, TRIAC & SCR. Fig. 1 EXPERIMENT TITLE MODULE NO. The operation can be summarized as follows-First Quadrant Operation of Triac. The V-I characteristics of a TRIAC is based on the terminal MT1 as the reference point. Fig. By using this product student can understand the basic concept of DIAC, TRIAC & SCR which are the basic devices used in Power Electronics. directional triode thyristor, the TRIAC, as shown in fig. Experiment No Page. Characteristics of a Triac. CIRCUIT DIAGRAM: Fig 1.1(a) Circuit diagram for VI characteristics of SCR. It is composed by joining p type and n type semiconductors in 5 layers as in fig. The TRIAC is like the DIAC with a gate terminal. LAB X. I-V CHARACTERISTICS OF MOSFETs 1. 8-3 shows the UJT-SCR phase control circuit used in this experiment. Triac Characteristics Apparatus with Regulated Power Supplies (AE 228 ). UJT Triggering of SCR 23 7. ☞Increase VAK voltage to maximum position. _____ Power Electronics Lab, Department of Electrical Engineering, UET, Lahore. The TRIAC is a three-terminal device which can conduct in either direction. 2. Fig.2 shows the characteristics of TRIAC. Features :Instrument comprises of two DC Regulated Power Supplies 0-30VDC/150mA & 0-5 VDC/150mA, three round meters for voltage & current measurement, Triac mounted behind the panel, connections of Supplies & Triac brought out at 4mm … Conduct an experiment to control the illumination of incandescent lamp using TRIAC, DIAC combination. of SCR and Triac phase controls shows how this is possible. Dual channel Oscilloscope 3. This injection layer is the key to the superior characteristics of IGBT. No 1. APPARATUS REQUIRED: Trainer kit, Patch cards, Multimeters. ... VI CHARACTERISTICS OF TRIAC 8 3. The 2N3819 is a more typical and ideal JFET than the 2N4392; is its transfer characteristic closer to a parabola (that is, is its transconductance closer to linear)? Power electronic trainer 2. In fig.1, OABC is the forward characteristics of SCR at I G =0. It consists of three terminals with a vast range of bipolar current carrying capacity.The designers of the IGBT think that it is a voltage controlled bipolar device with … main terminal) and A 2 (MT2) as it conducts by terminal. Instead of changing the light bulb, light dimmer circuits are designed in order to control the brightness of a bulb. 4.2 (a). Sketch Characteristics of TRIAC Then the Thyristor is … 01-04 2 Static characteristics of MOSFET and IGBT. EXPERIMENT-1(a) V-I CHARACTERISTICS OF SCR AIM: 1. Unlike the SCR, the triac conducts in either direction when turned on. 1 Object Load test on DC Shunt motor. In this mode, the junction J1 and J3 are forward biased but junction J2 is reverse biased. Triac means the device for AC control composed of 3 electrodes. V BO is the maximum forward or reverse voltage that the triac can tolerate before it breaks over into uncontrolled conduction. Static, dynamic and thermal characteristics. Fig :-modes of operation of TRIAC When anode is positive w.r.t. TRIAC. TRIAC is a type of Thyristors that can conduct current in both directions when the polarity activated. The structure of IGBT is very much similar to that of PMOSFET, except one layer known as injection layer which is p + unlike n + substrate in PMOSFET. DATE NAME OF THE EXPERIMENT SIGNATURE REMARKS 1 Gate Pulse Generation using R, RC and UJT 2 Characteristics of SCR 3 Characteristics of Triac 4 Characteristics of MOSFET and IGBT 5 AC to DC half controlled converter 6 AC to DC fully controlled Converter 7 Step down and step up MOSFET based choppers 8 IGBT based single phase PWM inverter 2mm Patch cords. Important Points About The V-I Characteristics of SCR Forward Characteristics. ☞Switch on Kit observe whether meter are reading 0. VI CHARACTERISTICS OF IGBT 20 5. Experiment Steps ☞Connections are made as shown in the circuit diagram. 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