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Computational and Applied Mathematics Journal

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Double Tangent Sampling Method for Sinusoidal Pulse Width Modulation

Computational and Applied Mathematics Journal
Vol.4 , No. 1, Publication Date: Feb. 27, 2018, Page: 8-14

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Authors

[1]	Ligeng Shao, School of Electrical and Information Engineering, Dalian Jiaotong University, Dalian, China.
[2]	Yanming Wu, School of Electrical and Information Engineering, Dalian Jiaotong University, Dalian, China.

Abstract

The control method of inverter for low power single-phase motor mainly uses pulse width modulation technology. Based upon the traditional natural sampling method, the tangent sampling method and the secant sampling method, the switching time point calculation formulae are derived for the double tangent sampling method. Compared the switching time with above three methods and analyzing the error precision, the SPWM wave generated by the double tangent sampling method are closest to the wave generated by the natural sampling method. The double tangent sampling method can improve the accuracy of SPWM wave. The harmonic analysis indicates that the SPWM wave obtained by the double tangent sampling method has greater fundamental component, and its low order harmonic components are closer to the natural sampling method compared with the SPWM wave obtained by the secant sampling method. The double tangent method realizes easily in digital systems. It is feasible to obtain an ideal SPWM wave by the double tangent method.

Keywords

Sinusoidal Pulse Width Modulation (SPWM), Tangent Sampling Method, Secant Sampling Method, Double Tangent Sampling Method

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