Tyumen Industrial University
Department of Electricity and Electronics
Laboratory work on discipline: "Physical fundamentals of electronics"
Lab number 5 Study of the thyristor
The study of the structure, the operating principle of the thyristor, its main parameters and characteristics.
3. Targets and performance of laboratory work
3.1. Explore CVC thyristor.
To investigate the current-voltage characteristics of the thyristor via EWB should:
0 assemble the circuit shown in Fig. 5.4;
0 to remove the dependence of the thyristor of I = f (U) of the anode current for three current control values, since Iupr = 0.
Fig. 5.4. Study Design straight branches thyristor CVC
Coordinates CVC points removed using voltmeters and ammeters. The measurement results are recorded in Table 5.1.
Іupr = 0 U
Іupr = U
3.2. According to the data obtained to build the CVC thyristor.
Fig. 5.5. Family CVC thyristor
CVC thyristor can be obtained in the mode of variation of voltage and current - DC Sweep.
Play the schematic diagram (Fig. 5.6) in the computer environment EWB, denoting the number of nodes along the path of the circuit (Circuit \ Schematic Options \ Show Nodes \ OK).
Fig. 5.6. Driving simulation forward branch CVC thyristor
3.3. Identify the basic parameters of the thyristor:
switching voltage UON - the lowest forward voltage, which switches the thyristor from the closed to the open state;
inrush current Іvkl - minimum forward current of the thyristor after switching on;
holding current Іud - minimum forward current, which is flowing through the thyristor at the open-loop control circuit, not off it.
The results are recorded in the Table. 5. 2.
Іupr = 0 = Іupr Іupr =
3.4. To analyze the results of experiments and draw conclusions.
4. Contents of the report
4.1. The name and the purpose of the laboratory work.
4.2. thyristor research schemes.
4.3. Tables with measurements.
4.4. CVC thyristor.
5. The criteria for evaluation of laboratory work
The results of laboratory works are estimated in the amount of up to 5 points according to the system set out in Table 5.3.