To determine holding, latching current and break over voltage of given SCR. 1 Object Load test on DC Shunt motor. 4.2 (a). 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 … Fig. ; V DRM is the maximum repetitive peak voltage (usually the maximum peak voltage of the applied AC wave) that can be reliably tolerated. In this mode, the junction J1 and J3 are forward biased but junction J2 is reverse biased. 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. This allows the component to conduct in both directions. of SCR and Triac phase controls shows how this is possible. 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. main terminal) and A 2 (MT2) as it conducts by terminal. RC Triggering Circuit – HWR & FWR 19 6. UJT Triggering of SCR 23 7. TRIAC Characteristics 9 3. 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. 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 V-I characteristics of a TRIAC is based on the terminal MT1 as the reference point. The TRIAC is like the DIAC with a gate terminal. Use the Curve Tracer to find the transfer characteristics of a 2N3819 JFET. 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 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. It has no cathode terminal, one of the three is gate and the others are A 1 (MT1 i.e. Two AVO meter 4. ... VI CHARACTERISTICS OF TRIAC 8 3. If high brightness is required, high watt bulb would have to play its role and vice versa. 1 EXPERIMENT TITLE MODULE NO. 6-12(b) is the symbol for triac. To study the TRIAC based AC/AC regulator or 1-Phase AC voltage controller using TRIAC Apparatus or Components: 1. Fig :-modes of operation of TRIAC SCR Characteristics 3 2. The characteristics curve is shown in the below Diagram. The anode and cathode are connected to main source through the VI CHARACTERISTICS OF MOSFET 14 4. 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 … Triac means the device for AC control composed of 3 electrodes. Instead of changing the light bulb, light dimmer circuits are designed in order to control the brightness of a bulb. When anode is positive w.r.t. 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)? 2. cathode, the curve between V and I is called the forward characteristics. ☞Switch on Kit observe whether meter are reading 0. Experiment -3. The circuit above shows a simple DC triggered triac power switching circuit. OBJECTIVE In this lab, you will study the I-V characteristics and small-signal model of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET). Zener 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. The two junctions are labeled J 1 and J 2.Figure below show the structure of n-channel IGBT. 2. Power Electronics. 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. Triac Characteristics Apparatus with Regulated Power Supplies (AE 228 ). MOSFET Characteristics 15 4. Characteristics of a Triac. The bridge rectifier, D1 to D4, provides a pulsating dc form the 18V ac voltage. CIRCUIT DIAGRAM: Fig 1.1(a) Circuit diagram for VI characteristics of SCR. 2. 8-3 shows the UJT-SCR phase control circuit used in this experiment. Other layers are called the drift and the body region. With switch SW1 open, no current flows into the Gate of the triac and the lamp is therefore “OFF”. Important Points About The V-I Characteristics of SCR Forward Characteristics. Fig. Plot the transconductance of this JFET. 8-1(f). 6.3.2 illustrates the main characteristics of the triac. Experiment 4 : TRIAC Characteristic Theory. UJT Triggering of SCR – HWR & FWR 33 9. 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 … Experiment No: 2 Experiment Name: Study of V- I Characteristics of TRIAC. The term IGBT is a semiconductor device and the acronym of the IGBT is insulated gate bipolar transistor. TRIAC have five layer and three terminals, the name TRIAC comes from its three electrodes (terminals) shown in fig9. The circuit symbol and schematic construction of one such device are shown in fig.1. If the supply voltage is increased from zero, a point reached (point A) when the SCR starts conducting. Fig.2 shows the characteristics of TRIAC. Note that the 2N3819 uses the pin out shown at left. In fig.1, OABC is the forward characteristics of SCR at I G =0. V BO is the maximum forward or reverse voltage that the triac can tolerate before it breaks over into uncontrolled 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. The triac characteristics is similar to SCR but it is applicable to both positive and negative triac voltages. S. No. EED 306. Output Power Characteristics Phase control is the most common form of Thyristor power control. TRIAC. 4 – (a) PNP Structure (b) I-V Characteristic Curve. iv List of Experiments Exp No Experiment Nmae Page No 1 Static characteristics of SCR and DIAC. 01-04 2 Static characteristics of MOSFET and IGBT. Aim: To study the V-I characteristics of TRIAC. NV6532 TRIAC Characteristic Trainer 2. Experiment: 3 Study of TRIAC Characteristics Objective: 1. (LC Commutation Circuit) Oscillation Chopper Circuit 29 8. directional triode thyristor, the TRIAC, as shown in fig. EXPERIMENT-1(a) V-I CHARACTERISTICS OF SCR AIM: 1. 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