Practical Realization of Three Phase Buck AC Converter Feeding Three Phase Star Connected RL Load using FPGA Real Time Controller
Venkatesha K1, Vidya H A2

1Venkatesha K, Dept. of Electrical and Electronics Engineering, Visvesvaraya Technological University/ BNM Institute of Technology/ Bengaluru, India. Email ID:
2Vidya H A, Dept. of Electrical and Electronics Engineering, Visvesvaraya Technological University / Global Academy of Technology/ Bengaluru, India. Email ID: 

Manuscript received on 02 June 2019 | Revised Manuscript received on 10 June 2019 | Manuscript published on 30 June 2019 | PP: 2985-2990 | Volume-8 Issue-8, June 2019 | Retrieval Number: H7469068819/19©BEIESP
Open Access | Ethics and Policies | Cite | Mendeley | Indexing and Abstracting
© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (

Abstract: A three phase bidirectional AC to AC buck converter circuit using power MOSFET is designed, rigged up and analyzed with three phase star connected RL load for electrical parameters such as output voltage, input current, input power factor, harmonic profile and efficiency using FPGA real time controller. The various PWM techniques such as ramp-DC symmetrical PWM (RDSPWM), ramp-triangular asymmetrical PWM (RTAPWM), sinusoidal asymmetrical PWM type-1 [SAPWM1] and sinusoidal asymmetrical PWM type-2 [SAPWM2] techniques are generated using FPGA real time controller in order to analyze the harmonic profile, input power factor and efficiency of the converter It is required to consider both harmonic profile and input power factor in order to increase the efficiency of power electronic converter. It is observed from experimental results that the RDSPWM technique gives lesser total harmonic distortion [THD] of output voltage and input current than other techniques. It is also observed that the SAPWM1 switching strategy gives high input power factor, more output voltage, high efficiency and moderate improvement of harmonic profile for the entire range of modulation index MI compared to other PWM techniques. Hence SAPWM1 technique is preferred for AC-to-AC converter than other techniques that renders easy filtration at lower cost.
Keyword: AC Chopper, RDSPWM, SAPWM1, SAPWM2, RTAPWM techniques, input power factor, THD, efficiency, FPGA real time controller.
Scope of the Article: Knowledge Engineering Tools and Techniques.