1. Thyristor Converters or Controlled Converters
The controlled rectifier circuit is divided into three main circuits:-
Power Circuit
Control Circuit
Triggering circuit
The commutation of thyristor is
Natural Commutation
Forced Commutation
Half Wave Single Phase Controlled Rectifier With Resistive Load

3. Example 1 In the rectifier shown in Fig. 3
Example 1 In the rectifier shown in Fig.3.1 it has a load of R=15  and, Vs=220 sin 314 t and unity transformer ratio. If it is required to obtain an average output voltage of 70% of the maximum possible output voltage, calculate:- (a) The firing angle, (b) The efficiency, (c) Ripple factor (d) Peak inverse voltage (PIV) of the thyristor

5. Half Wave Single Phase Controlled Rectifier With RL Load

7. Single-Phase Center Tap Controlled Rectifier With Resistive Load

10. Example 4 The rectifier shown in Fig. 3
Example 4 The rectifier shown in Fig.3.8 has load of R=15  and, Vs=220 sin 314 t and unity transformer ratio. If it is required to obtain an average output voltage of 70 % of the maximum possible output voltage, calculate:- (a) The delay angle, (b) The efficiency, (c) The ripple factor (d) The peak inverse voltage (PIV) of the thyristor.

12. Single-Phase Fully Controlled Rectifier Bridge With Resistive Load

15. Example 5 The rectifier shown in Fig. 3
Example 5 The rectifier shown in Fig.3.11 has load of R=15  and, Vs=220 sin 314 t and unity transformer ratio. If it is required to obtain an average output voltage of 70% of the maximum possible output voltage, calculate:- (a) The delay angle , (b) The efficiency, (c) Ripple factor of output voltage(d) The peak inverse voltage (PIV) of one thyristor.

18. Full Wave Fully Controlled Rectifier With RL Load In Continuous Conduction Mode

21. Full Wave Fully Controlled Rectifier With pure DC Load

23. Example 6 The rectifier shown in Fig. 3
Example 6 The rectifier shown in Fig.3.14 has pure DC load current of 50 A and, Vs=220 sin 314 t and unity transformer ratio. If it is required to obtain an average output voltage of 70% of the maximum possible output voltage, calculate:- (a) The delay angle , (b) The efficiency, (c) Ripple factor (d) The peak inverse voltage (PIV) of the thyristor and (e) Input displacement factor.

24. Input displacement factor.

25. Single Phase Full Wave Fully Controlled Rectifier With Source Inductance

29. Inverter Mode Of Operation

31. Fig.3.27 SCR inverter with a DC voltage source.

32. Three Phase Half Wave Controlled Rectifier with Resistive Load

39. Three Phase Half Wave Controlled Rectifier With DC Load Current

40. t=0

43. Three Phase Full Wave Fully Controlled Rectifier With Resistive Load

49. Solution: From (3.81) the average voltage is :
Example 11 Solve the previous example if the required dc voltage is 150V.
Solution: From (3.81) the average voltage is :
It is not acceptable result because the above equation valid only for
. Then we have to use the (3.85) to get
From (3.88) the rms value of the output voltage is:
Vm=537.4V
The PIV=

50. Three Phase Full Wave Fully Controlled Rectifier With pure DC Load Current

56. Inverter Mode of Operation