Digital sinusoidal signal calculation method, system and device and readable storage medium

Abstract

The invention discloses a digital sinusoidal signal calculation method, system and device and a readable storage medium. The method comprises the following steps: establishing a sinusoidal table of atarget sector; acquiring a current sinusoidal phase pointer, and judging whether the current sinusoidal phase pointer is in the target sector; if yes, searching a sine value corresponding to the current sine phase pointer in a sine table; if not, obtaining a target sine phase pointer corresponding to the current sine phase pointer in the target sector according to a preset corresponding relation,searching a sine table for a target sine value corresponding to the target sine phase pointer, and obtaining a sine value corresponding to the current sine phase pointer according to a quadrant wherethe current sine phase pointer is located and the target sine value; and obtaining a digital sinusoidal signal through all sinusoidal values. Under the same precision condition, the program storage space is saved, a table lookup method is optimized by utilizing the characteristics of the sine four-quadrant, so that the calculation process of sine calculation is accelerated, and the application requirement of SPWM on an MCU with relatively small resources is conveniently met.

Description

Technical field [0001] The present invention relates to the field of SPWM modulation, in particular to a digital sine signal calculation method, system, device and readable storage medium. Background technique [0002] In the BMS (Battery Management System) internal resistance detection application, the battery internal resistance sampling module needs to use a sinusoidal constant current source to excite the battery. In the digital application field, in order to produce a sinusoidal constant current power supply, a single-chip microcomputer is required to perform a digital sinusoidal pulse Wide modulation forms SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation) pulse waveform, and then filters to obtain the reference reference signal source of the sinusoidal constant current source. When forming SPWM sine pulse width modulation, the system scheme usually adopts high-frequency DDS (Direct Digital Frequency Synthesis, direct digital frequency synthesis) al...

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Problems solved by technology

When forming SPWM sinusoidal pulse width modulation, the system scheme usually adopts high frequency DDS (Direct Digital Frequency Synthesis, direct digital frequency synthesis) algorithm to realize SPWM output, need to calculate current sinusoidal signal value in the algorithm calculation process, prior art The fast calculation of the sinusoidal signal value is usually using the look-up table method. In order to obtain a high-precision sinusoidal signal value, a large sinusoidal table needs to be established. However, considering the MCU (Microcontroller Unit, micro control unit) of BMS and other applications The program storage space resources are limited, and the sine table should not occupy too much storage resources, resulting in the limitation of the accuracy of the sine signal value

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