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