Method and device for generating PWM modulation signal

Abstract

The invention discloses a method and device for generating a PWM modulation signal, comprising steps of setting an output cycle of a PWM modulation signal to be generated, obtaining a duty ratio parameter of the PWM modulation signal, and distributing high level signals and low level signals into N unit intervals in the output cycle according to the duty ratio parameter in order to generate the PWM modulation signal. The invention also discloses a device for generating the PWM modulation signal. The method and the device for generating the PWM modulation signal can effectively improve the stability of the circuit.

Description

technical field [0001] The invention relates to the field of signal modulation, in particular to a method and device for generating a PWM modulation signal. Background technique [0002] PWM modulation (Pulse Width Modulation, Pulse Width Modulation) is a very effective technology that uses the digital output of a microprocessor to control an analog circuit, and is widely used in the fields of measurement, communication, and power control and conversion. [0003] PWM modulation is to control the size of the output by controlling the size of the duty ratio parameter, and then control the speed of the motor, the brightness of the lamp and the size of the output current, etc. Specifically, in one output cycle, the PWM modulation signal is composed of a continuous high The level is composed of a continuous low level, and the ratio of the duration of the high level to the cycle time is the duty cycle parameter. In addition, a cycle is divided into N units, each unit occupies a c...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and device for generating PWM modulation signals, which can solve the problem of reduced circuit stability caused by continuously outputting high-level signals or low-level signals for a long time

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