Pulse width modulation (PWM) wave processing method and system, signal processing device, and medium

Abstract

The invention provides a pulse width modulation (PWM) wave processing method and system, a signal processing device, and a medium. The method and system, the signal processing device and the medium provided by the invention have the advantages that a cycle of a theoretical PWM signal is calculated according to a working main frequency and a signal resolution required by a microprocessor system generating PWM signals; duty ratios of the PWM signals are calculated according to an output voltage and a PWM signal full amplitude voltage that are required; the pulse width time of the theoretical PWMsignal and a corresponding count are then calculated; the cycle is then divided into a plurality of small cycles; the pulse width times of the adjusted PWM signals corresponding to the small cycles are adjusted, so that each width time is smaller than the maximum high level time that can be output by a timer or a PWM controller, the sum of the pulse width times of the adjusted PWM signals is identical to the pulse width time of the theoretical PWM signal, and a count sum is further identical to the original count; a corresponding number of the adjusted PWM signals with the small cycles are continuously output to replace the theoretical PWM signal; and therefore, the system resolution is improved, and the response time is shortened.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a processing method, system, signal processing device and medium of a pulse width modulated wave. Background technique [0002] Pulse Width Modulation (PWM) is a method of digitally encoding the level of an analog signal. Generally, a microprocessor (MPU) timer or PWM controller is used to generate stable high and low level pulses. By modulating the square wave The duty cycle is used to encode the level of a specific analog signal. The PWM signal is still digital because at any given moment, full-scale DC power is either completely on (ON) or not at all (OFF). [0003] The equivalent output voltage V within one PWM wave cycle O for: [0004] [0005] Among them, t H is the pulse width time of the PWM wave, T is the period of the PWM wave, V is the full amplitude voltage of the PWM wave, and α is the duty cycle of the PWM wave. [0006] and have: [0007...

AI Technical Summary

Problems solved by technology

[0018] In some industrial applications, there are many situations involving precise output control and fast response, which require short PWM cycles and high resolution. The most common method is to increase the main frequency of the MCU, but high main frequency means that the circuit needs to be solved Increased cost, serious radio frequency interference, increased MCU power consumption and many other difficulties, which are difficult to balance in industrial applications

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