Experiment No. 1 Half Wave Rectifier using R-Triggering

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1 Experiment No. 1 Half Wave Rectifier using R-Triggering Pre-Lab Reading: Power Electronics: Circuits, Devices and Applications, by M. H. Rashid, 3e. Objectives: To analyze resistive firing/triggering of silicon controlled rectifier (SCR) Equipment: AC-supply, SCR (MCR 100-6), a diode, load resistor of designed value, variable gate resistance (0 750 kω) and capacitors of designed value. Half Wave Rectifier using R-Triggering Figure 1 Design Procedure: Minimum Resistance (R min ): The minimum resistance R min should be such that when R G = 0, the gate current does not exceed the maximum allowable value, 1 (It is equal to the maximum voltage supplied by the AC supply)

2 (This maximum gate current is usually given by in the datasheet.) Using Equation (1): (choose the nearest standard resistor) The value of the selected standard resistor = Gate Resistance (R G ): The minimum value of gate triggering current is selected as specified in the datasheet (80µA in case of MCR 100-6). The SCR will turn on when instantaneous value of supply voltage V S becomes equal to (It is equal to the forward voltage drop across the diode). (It is the minimum value of gate current at which SCR fires). = (It is the gate-cathode voltage corresponding to Using Equation (2): (choose the nearest standard resistor) The value of the selected standard resistor = $ Selection of load resistance: Maximum value of anode to cathode current from data sheet = A Latching current from data sheet = A Holding current from data sheet = A

3 Choose a value of load resistance such that anode to cathode current does not exceed the rated current and is not less than the latching current when SCR is conducting. It is recommended to select load resistance of 820 ohm. Procedure: 1. Adjust the supply voltage as used in design procedure. Recommended is 10 V peak at frequency of Arrange the circuit as shown in Figure Keep the potentiometer resistance R G to its maximum value so I G is very small and SCR is not triggered. Measure and observe the voltage across load and SCR. 4. Decrease the resistance of potentiometer R G such that SCR is now fired and almost all the input voltage appears across the load. Measure and observe the change in voltage across load and SCR 5. Record your observations for at least ten different firing angles over the entire range of observation. 6. Record your observations and calculations in tabular form and also plot the waveforms observed on oscilloscope. 7. Compare the practical output voltage with theoretical output voltage.

4 Observation Set: No. Firing Angle α Vo (dc) (Practically using DMM) Vo (dc) (Theoretically using calculations) Sketch voltage waveform across load resistance for firing angle in reading 2

5 Sketch voltage waveform across Thyristor for firing angle used above Sketch voltage waveform across load resistance for firing angle in reading 4 Sketch voltage waveform across thyristor for firing angle used above

6 Sketch voltage waveform across load resistance for firing angle in reading 6 Sketch voltage waveform across thyristor for firing angle used above Sketch voltage waveform across load resistance for firing angle in reading 8

7 Sketch voltage waveform across thyristor for firing angle used above Sketch voltage waveform across load resistance for firing angle in reading 10 Sketch voltage waveform across thyristor for firing angle used above

8 Show your calculations of voltage with firing angle in reading 3 Show your calculations of voltage with firing angle in reading 7 Sketch variation of output voltage with firing angle

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