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

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

Half Wave Single Phase Controlled Rectifier With RL Load

Single-Phase Center Tap Controlled Rectifier With Resistive Load

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.

Single-Phase Fully Controlled Rectifier Bridge With Resistive Load

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.

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

Full Wave Fully Controlled Rectifier With pure DC Load

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.

Input displacement factor.

Single Phase Full Wave Fully Controlled Rectifier With Source Inductance

Inverter Mode Of Operation

Fig.3.27 SCR inverter with a DC voltage source.

Three Phase Half Wave Controlled Rectifier with Resistive Load

Three Phase Half Wave Controlled Rectifier With DC Load Current

t=0

Three Phase Full Wave Fully Controlled Rectifier With Resistive Load

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=

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

Inverter Mode of Operation