Method for calculating and generating SPWM (Sinusoidal Pulse Width Modulation) for thread spinner frequency converter by using real-time sine values

Abstract

The invention relates to a method for calculating and generating an SPWM (Sinusoidal Pulse Width Modulation) for a thread spinner frequency converter by using real-time sine values. A sinusoidal pulse width modulation wave needs to be generated in the frequency converter to control a motor, according to the conventional method, a sine table is adopted for table look-up, a relatively large chip FLASH space is needed, if the required accuracy on a sine value is relatively high, or the frequency change is relatively large, the required space can be increased by geometric times. The method disclosed by the invention combines a table look-up method and a Taylor formula developing method, the sinusoidal pulse width modulation wave is calculated and generated in real time, the sine wave is taken as the original signal and is generated by overlapping triangular wave with the frequency being 4k-16k in a carrier modulation way, after an angle of the sine wave is obtained, firstly, the angle is mapped into a first quartile, and then is subjected to interpolation by adopting an integer angle sine value nearest to the angle and by combining with Taylor series expansion, and the calculation on the sine value of any angle can be fast finished by adopting fixed-point calculation. The method has the advantages of being high in speed and accuracy, and small in occupied and store spaced.

Description

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AI Technical Summary

Benefits of technology

This patented technology uses an algorithm called Quaternary Format that performs certain calculations with very few memory spaces compared to traditional methods like Fourier or Hanning techniques for calculating values accurately without taking up too much room on their own computer system. It also improves efficiency by performing multiple computations simultaneously instead of sequentially each other. Overall this results in better performance and reduction of noise during operation while reducing power consumption.

Problems solved by technology

This patented technical problem addressed in this patents relates to calculating an accurate sinevalue for AC motors that have various types of controllers such as proportional valve controlled hydraulic systems. Traditional methods require expensive hardware components like RAM memory chips, processors, etc., making them difficult to use outside specialized equipment without sacrificing their effectiveness over longer periods of operation.