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Method and device for controlling pulse width modulation duty cycle

A control method and pulse width modulation technology, applied to controllers with pulse train output signals, electric controllers, etc., can solve the problems of limited adjustment range, limited, small frequency range, etc., to improve quality, reduce costs, reduce fluctuating effect

Active Publication Date: 2014-01-22
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the method of adjusting the frequency with a fixed on-time, the adjustment range is limited, and the frequency range of the adjustable frequency in the low frequency band is very small, so the ability to improve the accuracy by adjusting the frequency at low frequencies is limited.

Method used

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  • Method and device for controlling pulse width modulation duty cycle
  • Method and device for controlling pulse width modulation duty cycle
  • Method and device for controlling pulse width modulation duty cycle

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Embodiment

[0019] Such as figure 1 As shown, a typical automatic control system is composed of three devices: sensors, controllers, and actuators. The sensors send the collected signals to the controller. To increase or decrease the control amount, the actuator device performs output control according to the control amount sent by the controller. At present, the interface of these three devices has gradually developed from the traditional analog interface to the digital interface.

[0020] Such as figure 2 As shown, the working principle of the PWM actuator is: the PWM signal is a pulse width modulation signal, the PWM controller works at a given frequency, and the duty cycle of the output signal varies according to the given value of the duty cycle in each cycle. ratio will change. In one cycle, the time ratio of high level and low level is equal to the given value of duty cycle. In general, the operating frequency and duty cycle of the PWM are user-adjustable.

[0021] Such as i...

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Abstract

The invention relates to a method and a device for controlling pulse width modulation (PWM) duty cycle. The method comprises the following steps that (1) a data separator automatically separates input data into an integral part and a decimal part according to the judging result that the input data is a floating-point number or a fixed-point decimal; (2) a numerical integrator accumulates and integrates the decimal part separated by the data separator, wherein after being spilled, the integral part which is greater than 1 is input into an adder and is added to the integral part output by the data separator, and the remainder part is continuously left in an integral accumulator for accumulation in the next period; (3) in the current period, the adder outputs the accumulated integral part into a PWM duty cycle generator, and the PWM duty cycle generator adjusts the duty cycle of a PWM waveform according to the data. Compared with the prior art, the method and the device have the advantages that the output precision of a PWM executer can be improved, the cost is reduced, the stability of a control system can be more quickly realized, fluctuation is reduced, steady-state errors are reduced, the quality of the control system is improved, and the like.

Description

technical field [0001] The invention relates to an automatic control system, in particular to a pulse width modulation duty cycle control method and device for the automatic control system. Background technique [0002] With the development of automatic control technology and electronic technology, the controllers of automatic control systems are almost all realized by digital methods. A typical single-loop closed-loop control system is composed of sensors, controllers and actuators, and the data transmission methods are all digital. conduct. For example, a typical application case of a temperature control system based on a single-chip microcomputer is as follows: the temperature sensor converts the temperature signal into a 16-bit digital signal and sends it to the single-chip microcomputer, and the single-chip microcomputer executes the PID control algorithm according to the given value and deviation to calculate the control amount After that, it is sent to the PWM actuat...

Claims

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Application Information

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IPC IPC(8): G05B11/28
Inventor 琚长江杨根科白杰潘常春陈悦袁哲人徐园园
Owner SHANGHAI JIAO TONG UNIV
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