Analysis of the influence of load inductance on nonlinear distortions of a class D amplifier caused by «dead time»

Authors

DOI:

https://doi.org/10.20998/2074-272X.2021.3.05

Keywords:

GaN transistors, Class-D amplifier, nonlinear distortion, dead time, THD

Abstract

Goal. Analysis of the effect of load inductance at the output of the class D amplifier for different values of the duration of «dead time» and assessment of the adequacy of existing mathematical models for calculating the THD at the output of the amplifier depending on the duration of «dead time». Methodology. The study of the effect of «dead time» on the THD was performed using a computer model of the half-bridge converter board EPC9035 from Efficient Power Conversion. This board contains GaN transistors EPC2022 eGaN®, the corresponding control driver and other necessary elements for operation. The use of GaN transistors has made it possible to investigate the operation in a wide range of frequent switching, both to control the motor and to amplify the audio signal. Results. It is established that the value of load inductance affects the level of nonlinear distortions caused by «dead time». At inductance values that provide a constant sign of the output current, a difference arises between the duration of the input and output pulses, which increases the THD. At inductance values, when the choke current changes sign during a pulse, there is no error between the duration of the input and output pulses. Changing the inductance changes the relationship between the error signal and the non-error signal. THD changes accordingly. At high conversion frequencies, the voltage spikes caused by the choke current through the built-in diodes during the dead time are partially compensated by overcharging the output capacitance of the transistors, which also reduces harmonic distortion. Originality. For the first time, the value of the THD at the outlets in the fallowness of the different indices of the inductance of the choke and the theoretical calculation of the value in the results of the computer model was obtained. Practical significance. The dependence of the THD values on the inductance of the choke for converters with a switching frequency range from 1 kHz to 400 kHz, which allows them to be used both to control the motor and to amplify the audio signal.

Author Biographies

S. A. Naida, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Ukraine

Doctor of Technical Science, Professor

Y. O. Onykienko, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Ukraine

PhD, Associate Professor

O. I. Drozdenko, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Ukraine

PhD, Associate Professor

O. I. Smolenska, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Ukraine

Postgraduate Student

V. S. Baran, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Ukraine

Postgraduate Student

N. O. Iakunina, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Ukraine

PhD, Associate Professor

References

Koeslag F., du T. Mouton H., Beukes H. J., Midya P. A detailed analysis of the effect of dead time on harmonic distortion in a class D audio amplifier. AFRICON 2007, 2007, pp. 1-7. doi: https://doi.org/10.1109/afrcon.2007.4401640.

Wu C. M., Lau Wing-Hong, Shu-Hung Chung H. Analytical technique for calculating the output harmonics of an H-bridge inverter with dead time. IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 1999, vol. 46, no. 5, pp. 617-627. doi: https://doi.org/10.1109/81.762927.

Li C., Gu Y., Li W., He X., Dong Z., Chen G., Ma C., Zhang L. Analysis and compensation of dead-time effect considering parasitic capacitance and ripple current. 2015 IEEE Applied Power Electronics Conference and Exposition (APEC), 2015, pp. 1501-1506. doi: https://doi.org/10.1109/apec.2015.7104546.

Mauerer M., Tüysüz A., Kolar J. W. Distortion analysis of low-THD/high-bandwidth GaN/SiC class-D amplifier power stages. 2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015, pp. 2563-2571. doi: https://doi.org/10.1109/ecce.2015.7310020.

Mauerer M., Kolar J. W. Distortion minimization for ultra-low THD class-D power amplifiers. CPSS Transactions on Power Electronics and Applications, 2018, vol. 3, no. 4, pp. 324-338. doi: https://doi.org/10.24295/cpsstpea.2018.00032.

Chierchie F., Paolini E. E. Analytical and numerical analysis of dead-time distortion in power inverters. 2010 Argentine School of Micro-Nanoelectronics, Technology and Applications (EAMTA), 2010, pp. 6-11. Available at: https://ieeexplore.ieee.org/document/5606373 (accessed 22 June 2020).

Chierchie F., Paolini E. E. Quasi-analytical spectrum of PWM signals with dead-time for multiple sinusoidal input. 2011 IEEE International Symposium of Circuits and Systems (ISCAS), 2011, pp. 1033-1036. doi: https://doi.org/10.1109/iscas.2011.5937745.

Chierchie F., Stefanazzi L., Paolini E. E., Oliva A. R. Frequency analysis of PWM inverters with dead-time for arbitrary modulating signals. IEEE Transactions on Power Electronics, 2014, vol. 29, no. 6, pp. 2850-2860. doi: https://doi.org/10.1109/tpel.2013.2276098.

Onikienko Y.O., Pilinsky V.V., Popovych P.V., Lazebnyi V.S., Smolenska O.I., Baran V.S. Modelling of operation modes and electromagnetic interferences of GaN-transistor converters. Electrical Engineering & Electromechanics, 2020, no. 3, pp. 37-42. doi: https://doi.org/10.20998/2074-272X.2020.3.06.

Gedz O., Lazebnyi V., Onikienko Y., Vlasjuk A. EMI simulation of GaN power stage for audio class D amplifiers. 2018 14th International Conference on Advanced Trends in Radioelecrtronics, Telecommunications and Computer Engineering (TCSET), 2018, pp. 204-207. doi: https://doi.org/10.1109/tcset.2018.8336187.

Published

2021-06-23

How to Cite

Naida, S. A., Onykienko, Y. O., Drozdenko, O. I., Smolenska, O. I., Baran, V. S., & Iakunina, N. O. (2021). Analysis of the influence of load inductance on nonlinear distortions of a class D amplifier caused by «dead time». Electrical Engineering & Electromechanics, (3), 32–37. https://doi.org/10.20998/2074-272X.2021.3.05

Issue

Section

Industrial Electronics