TP3:- Output for single lamp load connection (no waveform). 7-15 3 Controlled HWR & FWR using RC Triggering circuit. Operating characteristics of triac in the 1st and 3rd quadrants are similar but for the direction of flow of current and applied voltage. Switch on the TRIAC knob and firing circuit kit. Average output voltage,       Vo = (2*Vm / Π ) *cosα. Once the gate V. For a DIAC, there is a breakover voltage present in either direction. 3. a) Reduce the gate voltage supply to zero. The present system makes use of armature voltage control for speed control of DC motor with direction reversal facility and dynamic braking system. Triac can be triggered by both positive and negative polarity voltages applied at the gate. In this system when the motor is required to be braked, the pulses for the bridge working as converter are blocked and the other bridge is operated in inverter mode. Well-known among them was Ward Leonard system. TRIAC Characteristics 9 3. Vary the voltage applied across Gate and corresponding  V, 5)     The above steps are repeated for different values of I, 6)     Vary the voltage across Collector and Emitter and noted down V, TRANSFER CHARACTERISTICS                                    DRAINCHARACTERISTIC. The value of emf of a cell does not remain constant but varies with the change in specific gravity of electrolyte, temperature and the […] Switch on the power supply to the CRO. 4. The initial set gate current should be taken as the value, for gate current for the consecutive readings. You must not observe the waveforms for triggering circuit & output simultaneously on CRO. At ωt = π + α, SCRs T2 and T4 are triggered, then current flows through the path N – T2 – R load- T4 – L. At ωt = 2π, supply voltage and current goes to zero, SCRs T2 and T4 are turned off. DS1 should light. 5. Vary the firing angle step by step in the range 180° – 0°. 1. What are the different types of Power MOSFET? Current ‘I’, charges capacitor ‘c’ at a rate determined by ‘R’ voltage across capacitor is marked by ‘Vc’ as shown. 5. 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. Keep CHOKE /NO CHOKE mode as per desired mode of operation. Efficiency. d) Look at your circuit and then record in Table 8-1 the triggering mode of Q1 in this configuration. Then throw the switch SW3 in upward position. Because they also demand no input current, they are easier to drive. The advantages of three phase converters over single-phase converters are as under: In 3-phase. Note MT1, MT2 & gate terminals properly. The device can be turned ON at forward voltages less than break over voltage by applying suitable gate current. For each firing angle observe the output waveform through CRO. Why? characteristics by using two transistors analogy. But here the controlling parameter is gate –emitter voltage VGE because IGBT is a voltage –controlled device. VL = 81 volts (RMS), (i.e. 5. Circuit Diagram : Theory: An TRIAC is a device which can be turned on through the gate pulse for both positive and negative values of V AK and turned off using power circuit i.e., turn on is controlled … Explain the working operation of S.C.R. Demonstrate the four triggering modes of a TRIAC. As the name indicates, a dual converter consists of two converters (single phase or three phases), both either fully controlled or half controlled connected to the same load. What is a three phase controlled rectifier? Demonstrate bi-directional conduction of a gated TRIAC. This switch should be normally in downward position. Compare Power MOSFET’s , IGBT with BJT’s. 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. The symbol and pin out of TRIAC is shown below. Zener diode ‘Z’ functions to clip the rectified voltage to a standard level, ‘Vz’ which remains constant except near the Vdc zero. 4. C. Demonstrate bi-directional operation of DIAC. When the anode is more positive  with respect to the cathode. Would you say that TRIAC has four separate and distinct triggering modes? Like a power MOSFET, an IGBT has also thousands of basic structure cells connected appropriately on a single chip of silicon. Define Holding current, Latching current on state resistance, Break down voltage, 3. 4. Characteristic # 1. MOSFET Characteristics 15 4. Yes. 2. Field effect transistors, on the other hand do not normal require any input current and are unipolar devices. 16-19 4 20 AC- voltage controller by using TRIAC-DIAC combination.-22 5 UJT firing circuit for HWR & FWR. It was also initially called insulated gate transistor (. To study Three Phase Converter (Half Wave and Full wave Bridge). Explain the working operation of V-I characteristics of S.C.R. V-I characteristics of TRIAC are obtained. Triac is the word derived by combining the capital letters from the words TRIode and AC. You can observe waveforms TP2 and TP4 with Motor as load. What are the effects of load inductance on the performance of AC voltage controllers? It exhibits negative resistance characteristics. 2 - SCR Gate Characteristics. Connections are made as shown in the circuit diagram. The anode current through the device at this instant is the holding current (I. One particular use of triac circuits is in light dimmers for domestic lighting, and they are also used in many other power control situations including motor control. e) Record the characteristics of this Q1 triggering mode in Table 8-1. f) Open S2 and reduce all voltage sources to zero. Positive or negative potential across the terminals can be triggered by reaching +/- breakover voltage. The firing angle can be controlled up to above 150o. 2. This device combines into it the advantages of both MOSFET and BJT. Objective B. The attenuator o/p can be observed on CRO. 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 diodes D1, D2 and D3 provide merely a return path for the current to the most negative line terminal. 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