Convincing Features
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Date
Single Phase Half Controlled Rectifier
EQUIPMENT
1 SCR (10A/600V) with heat sink
2 Diode (10A/600V) with heat sink
3 Potentiometer (50Ω/2A)
4 Oscilloscope
5 Transformer (1-phase) 230V/24V
1. Connect the circuit diagram in Figure 1.
2. Connect the oscilloscope and voltmeter across the load.
3. Keep the potentiometer at the minimum position.
4. Switch on the step down ac source.
5. Check the gate pulses at G1-K1 & G2-K2, respectively.
6. Observe the wave form on the oscilloscope and note the triggering angle ‘α’ and
7. Note the corresponding reading of the voltmeter. Also note the value of Maximum amplitude Vm from the waveform.
8. Set the potentiometer at different positions and follow the step given in (6) for every position.
9. Tabulate the readings in Table 1.
Table 1
1. Plot the waveform of the input and output voltage and current, triggering angle
2. What is the delay angle control of converters?
3. What is natural or line commutation?
4. What is the principle of phase control?
5. What is extinction angle?
6. Can a freewheeling diode be used in this circuit and justify the reason?
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