Novel sampling method for generating SPWM (sinusoidal pulse width modulation) control signals

A control signal and a new type of technology, applied in the direction of analog-to-digital converters, etc., can solve the problems of small number of sampling points and low accuracy, and achieve the effect of convenient frequency conversion, high precision, and improved real-time performance

Inactive Publication Date: 2013-06-26
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology

This sampling method has a small number of sampling points and is numerically equal to the value N of the carrier ratio. The algorithm is simple, but the accuracy is not high.

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  • Novel sampling method for generating SPWM (sinusoidal pulse width modulation) control signals

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Embodiment Construction

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] refer to figure 1 Shown, a kind of novel sampling method that produces SPWM control signal, comprises the following steps:

[0027] Step 1) Detect the input signal and obtain the modulation wave frequency f through external input s , modulation degree m a , carrier ratio N and dead time t s parameters, and save the values ​​sin(ω·t) of two adjacent "carrier peak sampling points" a ) and sin(ω·t b );

[0028] Step 2) According to the two adjacent sampling values ​​sin(ω t a ) and sin(ω·t b ), through the mathematical linear combination method, construct a virtual "carrier valley value sampling point" value sin(ω·t c ), sin(ω·t c )=A sin(ω·t a )+B sin(ω·t b ), t b =t c +T c / 2=t a +T c ,T c is the carrier cycle value, and the solution is A=B= , and use these three "sampling points" to calculate the re...

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Abstract

The invention discloses a novel sampling method for generating SPWM (sinusoidal pulse width modulation) control signals. The method includes: constructing virtual sampling points according to the linear combination mode in mathematics to reduce the number of sampling points in reality; getting an appropriate value of a natural intersection time of a carrier wave and a modulated wave by the linear extrapolation operation method to obtain higher pulse width control accuracy; and completing control on opening and closing of each power tube in a rectifier (inverter). The number of the sampling points in the sampling method is consistent with that in conventional symmetric regular sampling methods, but pulse width accuracy of the sampling method is higher than that of conventional regular sampling methods, variable-polarity regular sampling, two-point-type regular sampling, four-point-type regular sampling, linear combination sampling, linear extrapolation sampling and the like which are commonly used, and harmonic content of output voltage in the sampling method is small; on the basis of a DSP (digital signal processor), hardware designing is easy to program and good in man-machine interactivity, a program can be flexibly modified to meet requirements under various occasions, and the novel sampling method is mainly applied to rectifiers and inverters.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a novel sampling method for generating SPWM control signals. Background technique [0002] In recent years, with the development of microprocessor technology, computer technology and power electronics technology, Pulse Width Modulation (PWM) technology based on Digital Signal Processor (DSP) has been widely used in three In systems such as phase motor control, frequency converters, rectifiers and inverters. Among various PWM control methods, Sinusoidal PWM (SPWM for short) technology has been widely used because of its simple algorithm, easy hardware implementation, small harmonic content, and the ability to dynamically modify amplitude and frequency. application. [0003] The basic modulation principle of SPWM modulation technology is based on the principle that "when narrow pulses with equal impulse but different shapes are added to the link with inertia, the effect is basica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 朱其新陈健亨刘红俐
Owner SUZHOU UNIV OF SCI & TECH
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