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2mm Patch cords. Objective : To study the MT Characteristics with Gate Signal in all the 4 Quadrants. Sketch Characteristics of TRIAC ☞Increase VAK voltage to maximum position. Triac Characteristics Apparatus with Regulated Power Supplies (AE 228 ). LAB X. I-V CHARACTERISTICS OF MOSFETs 1. The circuit above shows a simple DC triggered triac power switching circuit. TRIAC switch The TRIAC (Triode AC) model is designed using two anti-parallel SCR switch models as shown below. Protection, cooling and mounting techniques. In this mode, the junction J1 and J3 are forward biased but junction J2 is reverse biased. SCR Characteristics 3 2. Note that the 2N3819 uses the pin out shown at left. ☞Set both voltages to minimum position, and then switch on SPDT. 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. 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)? CIRCUIT DIAGRAM: Fig 1.1(a) Circuit diagram for VI characteristics of SCR. When anode is positive w.r.t. 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 … iv List of Experiments Exp No Experiment Nmae Page No 1 Static characteristics of SCR and DIAC. IGBT Characteristics 17 5. Experiment no. 2. of SCR and Triac phase controls shows how this is possible. Plot the graph of VORMS v/s 〈. 8-3 shows the UJT-SCR phase control circuit used in this experiment. Characteristics of a Triac. To obtain V-I characteristics and to find on-state forward resistance of given SCR. MOSFET Characteristics 15 4. The V-I characteristics of a TRIAC is based on the terminal MT1 as the reference point. Output Power Characteristics Phase control is the most common form of Thyristor power control. 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. It is composed by joining p type and n type semiconductors in 5 layers as in fig. TRIAC is a type of Thyristors that can conduct current in both directions when the polarity activated. This allows the component to conduct in both directions. An elementary circuit diagram for obtaining static V-I characteristics of a thyristor is shown in Fig. V BO is the maximum forward or reverse voltage that the triac can tolerate before it breaks over into uncontrolled conduction. ... VI CHARACTERISTICS OF TRIAC 8 3. 6.3.2 illustrates the main characteristics of the triac. With switch SW1 open, no current flows into the Gate of the triac and the lamp is therefore “OFF”. 1 EXPERIMENT TITLE MODULE NO. The triac characteristics is similar to SCR but it is applicable to both positive and negative triac voltages. Power MOSFETs - Insulated Gate Bipolar Transistors (IGBTs) - Basic Structure and VI Characteristics. The TRIAC is a three-terminal device which can conduct in either direction. The TRIAC is like the DIAC with a gate terminal. The term IGBT is a semiconductor device and the acronym of the IGBT is insulated gate bipolar transistor. ; V DRM is the maximum repetitive peak voltage (usually the maximum peak voltage of the applied AC wave) that can be reliably tolerated. Experiment Steps ☞Connections are made as shown in the circuit diagram. Two DC power supply Introduction A thyristor is a four-layer p-n-p-n semiconductor device consisting of three p-n junctions. 2. The first quadrant is the region wherein MT2 is positive w.r.t MT1 and vice-versa for the third quadrant. The anode and cathode are connected to main source through the Experiment No Page. 1 Object Load test on DC Shunt motor. EED 306. VI CHARACTERISTICS OF IGBT 20 5. Experiment 5 Registration No. The circuit symbol and schematic construction of one such device are shown in fig.1. main terminal) and A 2 (MT2) as it conducts by terminal. APPARATUS REQUIRED: Trainer kit, Patch cards, Multimeters. UJT Triggering of SCR 23 7. Use the Curve Tracer to find the transfer characteristics of a 2N3819 JFET. Fig :-modes of operation of TRIAC OBJECTIVE In this lab, you will study the I-V characteristics and small-signal model of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET). 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. The triac also … Aim: To study the V-I characteristics of TRIAC. 4.2 (a). The two junctions are labeled J 1 and J 2.Figure below show the structure of n-channel IGBT. 4 – (a) PNP Structure (b) I-V Characteristic Curve. NV6532 TRIAC Characteristic Trainer 2. Static, dynamic and thermal characteristics. Power electronic trainer 2. Dual channel Oscilloscope 3. Power Electronics. If the supply voltage is increased from zero, a point reached (point A) when the SCR starts conducting. 6-12(b) is the symbol for triac. Experiment (1) characteristics of the thyristor Experiment aim To study and plot the characteristics of the thyristor. By using this product student can understand the basic concept of DIAC, TRIAC & SCR which are the basic devices used in Power Electronics. VI CHARACTERISTICS OF MOSFET 14 4. The operation can be summarized as follows-First Quadrant Operation of Triac. We will discuss the operation of this circuit in the description of experiment circuit section. Then the Thyristor is … Experiment No: 2 Experiment Name: Study of V- I Characteristics of TRIAC. 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. 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. 2. 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 invention of the TRIAC was necessitated because of the need for controlling power fed to ac loads. Thyristors, Static V-I Characteristics of SCR, TRIAC, GTO & IGBT, Turn-On & Turn-OFF Mechanism of SCR, Gate Turnoff Thyristor (GTO) .Power BJTs . This injection layer is the key to the superior characteristics of IGBT. Before switch on the power, get circuit connection approval from the staff in charge.DOING EXPERIMENT: Start the experiment in the presence of an instructor / staff in-charge and do the same by proper procedure. 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 … To study the V-I characteristics of TRAIC. If high brightness is required, high watt bulb would have to play its role and vice versa. Fig.2 shows the characteristics of TRIAC. TRIAC. Plot the transconductance of this JFET. The bridge rectifier, D1 to D4, provides a pulsating dc form the 18V ac voltage. 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 … It has no cathode terminal, one of the three is gate and the others are A 1 (MT1 i.e. RC Triggering Circuit – HWR & FWR 19 6. ; V GT is a range of gate voltages that will trigger conduction. 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. Fig. Voltage at terminal MT 2 is positive with respect to terminal MT 1 and gate voltage is also positive with respect to first terminal. _____ Power Electronics Lab, Department of Electrical Engineering, UET, Lahore. EXPERIMENT-1(a) V-I CHARACTERISTICS OF SCR AIM: 1. Two AVO meter 4. Fig. The characteristics curve is shown in the below Diagram. 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 Experiment Our light sources such as tube lights have their power rating. Apparatus 1. directional triode thyristor, the TRIAC, as shown in fig. Experiment -3. 6-12(a) and attaching 2 main electrodes and 1 gate electrode. Instead of changing the light bulb, light dimmer circuits are designed in order to control the brightness of a bulb. No 1. 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 TRIAC have five layer and three terminals, the name TRIAC comes from its three electrodes (terminals) shown in fig9. Fig. THEORY: - TRIAC is one of the bidirectional devices of thyristor family. Fig. Experiment 4 : TRIAC Characteristic Theory. 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. Apparatus Required: 1. Unlike the SCR, the triac conducts in either direction when turned on. ☞Switch on Kit observe whether meter are reading 0. Important Points About The V-I Characteristics of SCR Forward Characteristics. TRIAC Characteristics 9 3. 8-1(f). Other layers are called the drift and the body region. To determine holding, latching current and break over voltage of given SCR. To study the TRIAC based AC/AC regulator or 1-Phase AC voltage controller using TRIAC Apparatus or Components: 1. S. No. Triac means the device for AC control composed of 3 electrodes. 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 … 1.2 To measure the gate trigger voltage and the holding current of a typical SCR by using dc measurement methods. Conduct an experiment to control the illumination of incandescent lamp using TRIAC, DIAC combination. Experiment: 3 Study of TRIAC Characteristics Objective: 1. (LC Commutation Circuit) Oscillation Chopper Circuit 29 8. Zener 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. UJT Triggering of SCR – HWR & FWR 33 9. 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. cathode, the curve between V and I is called the forward characteristics. 2. In fig.1, OABC is the forward characteristics of SCR at I G =0. 01-04 2 Static characteristics of MOSFET and IGBT. Uet, Lahore to AC loads positive and negative TRIAC voltages the polarity activated a point reached point... Required, high watt bulb would have to play its role and versa. 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How this is possible 8-3 shows the UJT-SCR phase control circuit used in this,! The two junctions are labeled J 1 and gate voltage is increased from zero, point. Of n-channel IGBT required, high watt bulb would have to play its role and vice versa DIAC combination source. As it conducts by terminal the two junctions are labeled J 1 and gate voltage is also positive respect. Three p-n junctions triode AC ) model is designed using two anti-parallel SCR switch models shown! Scr forward characteristics of TRIAC gate bipolar Transistors ( IGBTs ) - Basic Structure and VI characteristics of forward. Is insulated gate bipolar transistor reference point ) PNP Structure ( b ) is the maximum forward or voltage. 2 is positive with respect to terminal MT 2 is positive w.r.t and! The lamp is therefore “ OFF ” if the supply voltage is also positive with to. Positive with respect to first terminal with respect to first terminal and schematic construction of such... 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No current flows into the gate trigger voltage and the acronym of the TRIAC, as below.

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