Design and Application SCR Trigger Circuit for Three-phase Half-wave Controlled Rectifier with Resistive Load

  • Effendi Politeknik Aceh
  • Fitriady Politeknik Aceh
Keywords: Theree-phase half wave controlled rectifier, SCR, Comparator, Triggering delay angle, Everage output voltage


Power electronics is a field of science that studies and discusses electronics applications related to large-power electrical equipment, one of the sub-subject studied is the AC to DC converter such as a three-phase half-wave controlled rectifier with a resistive load in which output voltage can be controlled by adjusting the triggering delay angle of gate SCR. The components used include a three-phase step-down transformer where the output is used as a reference signal to determine the starting point (30o) and the endpoint (150o) of triggering delay angle, it is also used as a power source for the system, LM393 is used as a comparator between three-phase rectifier (Vd) with DC voltage (Vreference), likewise to compare triangular waves with DC voltages that resulting from changes in the voltage on the potentiometer in order to control the triggering delay angle (α) of SCR. The first step that must be taken to make measurements using an oscilloscope is to determine the ton and toff values for each angle by rotating the potentiometer on the comparator circuit and then measuring the average output voltage (Vo),  determination the triggering angle in this research is still done manually so that the measurement results compared to the calculation has a difference this is due to the level of accuracy in observing the oscilloscope, on the other hand, the three-phase transformer and sources used are not in ideal conditions.


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M. H. Rashid, POWER ELECTRONICS HANDBOOK Device, Circuits, and Application, Second Edi. Academic press is an imprint of elsevier, 2007.

K. K. Singh, M D, Power Electronics, Second Edi., vol. 21, no. 1. New Delhi: Tata McGraw-Hill publisihing companya limited New Delhi, 1998. doi: 10.1080/09557579808400206.

M. Aslam and G. Noida, “SCR based Triggering Method for Single Phase Induction Motor,” J. Emerg. Technol. Innov. Res., vol. 3, no. 5, pp. 104–107, 2016.

Effendi, “DISAIN DAN APLIKASI PENGATUR TEGANGAN AC SATU FASA ( Design and Aplication AC Voltage Controller Single Phase ),” J-Innovation, vol. 8, no. 2, pp. 1–6, 2019.

M. Satpute Akshaykumar, M. Tambe Sagar, M. Shinde Vijay, and P. Mone, “Soft Starting of Three Phase Induction Motor,” Int. J. Res. Trends Innov., vol. 2, no. 04, p. 1, 2017, [Online]. Available:

T. K. Chakraborty and S. H. Rakib, “A SIMPLE DIGITAL TRIGGERING CIRCUIT FOR THREE-PHASE,” Int. J. Ind. Electron. Electr. Eng., vol. 6, no. 2, pp. 2347–2350, 2018.

M. H. Rashid, Power electronics and applications, Fourth Edi. Edinburgh Gate: Pearson, 2014. doi: 10.1109/pedstc.2014.6799390.

S. A. S. Alkadhim, “Three Phase Transformer: Connection and Configuration,” SSRN Electron. J., no. July, 2020, doi: 10.2139/ssrn.3647143.

Z. Zhang, M. Mo, and C. Wu, “Three-phase distribution transformer connections modeling based on matrix operation method by phase-coordinates,” Eurasip J. Wirel. Commun. Netw., vol. 2021, no. 1, 2021, doi: 10.1186/s13638-021-01945-z.

How to Cite
Effendi and Fitriady, “Design and Application SCR Trigger Circuit for Three-phase Half-wave Controlled Rectifier with Resistive Load ”, JI, vol. 8, no. 2, pp. 246-256, Jul. 2023.