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A New Sampling Method for Generating Spwm Control Signal

A technology of controlling signals and sampling points, which is applied in the new sampling field of generating SPWM control signals, 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: 2016-04-27
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.

Method used

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  • A New Sampling Method for Generating Spwm Control Signal

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Embodiment Construction

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] refer to figure 1 Shown, a kind of novel sampling method that produces SPWM control signal, comprises the following steps:

[0026] 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 );

[0027] 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 register co...

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Abstract

The invention discloses a new sampling method for generating SPWM control signals. Virtual sampling points are constructed according to the mathematical linear combination to reduce the number of sampling points in reality; The approximate value of the natural intersection point of the modulated wave is used to obtain higher pulse width control accuracy; the control of the on and off states of each power tube in the rectifier (inverter) is completed according to the law of sine. The number of sampling points of this sampling method is consistent with that of the traditional symmetrical regular sampling method, but the precision of its pulse width control is higher than the traditional regular sampling method and the common polarity-variable regular sampling, two-point regular sampling, and four-point sampling. Regular sampling, linear combination sampling and linear extrapolation sampling methods, etc., the harmonic content of the output voltage is small, and the hardware design based on DSP is easy to program, the human-computer interaction is good, and the program can be modified flexibly. Meet the needs of various occasions, mainly used in 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-phase motor control, In systems such as frequency converters, rectifiers and inverters. Among various PWM control methods, Sinusoidal PWM (SPWM for short) technology has been widely used because of its advantages of simple algorithm, easy hardware implementation, small harmonic content, and the ability to dynamically modify amplitude and frequency. . [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 bas...

Claims

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Application Information

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Patent Type & Authority Patents(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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