Over-sampling signal processing method for PWM (pulse width modulation) sampling control system

A signal processing and control system technology, applied to electric controllers, controllers with pulse train output signals, etc., can solve the problems that affect the transient response speed of the control system, high-frequency signal tracking ability, signal bandwidth limitation, etc.

Inactive Publication Date: 2017-06-13
GUANGXI UNIV
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  • Application Information

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Problems solved by technology

The signal bandwidth is limited, which affects the transient response speed of the control system and the ability to track high-frequency signals

Method used

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  • Over-sampling signal processing method for PWM (pulse width modulation) sampling control system
  • Over-sampling signal processing method for PWM (pulse width modulation) sampling control system
  • Over-sampling signal processing method for PWM (pulse width modulation) sampling control system

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Embodiment Construction

[0022] figure 1 It is a structural schematic diagram of an embodiment of the present invention. This is a typical PWM oversampling feedback control system, including PWM circuit, controller, oversampling signal processing unit, anti-aliasing filter, carrier frequency setting unit and sampling frequency setting unit. The controller, the oversampling signal processing unit, the carrier frequency setting unit and the sampling frequency setting unit are realized by a DSP chip through programs and corresponding hardware circuits. The oversampling signal processing unit is actually a piece of computer program, which implements the oversampling signal processing method proposed by the present invention. Carrier frequency and sampling frequency can run autonomously, also can keep synchronous relation by certain method (such as PLL or frequency divider), in the present embodiment, PWM carrier frequency is 10kHz, and sampling frequency is 80kHz, is controlled by the internal of same ch...

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Abstract

The invention relates to the field of sampling control signal processing, in particular to an over-sampling signal processing method for PWM (pulse width modulation) sampling control. Along with the development of the electron technology, the computer information processing speed is greatly accelerated, and the result shows that the control signal sampling frequency can be greatly improved. The optimal switch frequency of a power switch device in a high-powder PWM circuit is much smaller than the signal sampling frequency allowed by a computer. In one PWM control period, a control signal can be subjected to multiple sampling and operation, i.e. over-sampling. Therefore more system information can be obtained; the performance of a sampling control system is improved. The over-sampling signal processing method has the advantages that the defects of single sampling are overcome; the advantages of an over-sampling average method are combined; a novel over-sampling signal processing method is provided; the signal frequency bandwidth can be improved; the inherent carrier wave interference of the PWM circuit is inhibited; the control precision is improved; the transient response speed of the PWM sampling control system is accelerated; the high-frequency signal tracking capability of the PWM sampling control system is improved.

Description

technical field [0001] The invention relates to the field of signal processing of a sampling control system, in particular to an over-sampling signal processing method for a PWM sampling control system. Background technique [0002] Generally speaking, sampling control is mainly realized by means of a digital computer. In the initial stage of the development of computer control technology, the speed of computer processing data was low, and the theory and application of computer control systems were basically based on single sampling control technology, that is, the three steps of signal sampling, control law calculation and control quantity output They are completed successively within the same sampling period, that is, the signal sampling period is equal to the control period. With the development of electronic technology, the processing speed of signal conditioning circuits such as computers and A / D converters has been greatly improved, and the sampling frequency can be g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/28
CPCG05B11/28
Inventor 黄洪全潘玥夏雨
Owner GUANGXI UNIV
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