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Production method of phase-based pulse width modulated sinusoidal voltage waveform data

A pulse width modulation, waveform data technology, applied in electrical components, output power conversion devices, conversion of AC power input to DC power output, etc., can solve the complex sinusoidal voltage pulse width modulation wave, reduce reliability, wrong waveform, etc. problems, to achieve the effect of intuitive and simple control, complete control functions and good performance

Inactive Publication Date: 2003-10-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, it is very complicated to use software design to realize the generation of sinusoidal voltage PWM wave, and if the structure level is not clear enough and the program priority is not properly arranged in the design, it will generate wrong waveforms and reduce reliability.

Method used

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  • Production method of phase-based pulse width modulated sinusoidal voltage waveform data
  • Production method of phase-based pulse width modulated sinusoidal voltage waveform data
  • Production method of phase-based pulse width modulated sinusoidal voltage waveform data

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Embodiment Construction

[0025] figure 1 The principle block diagram of the generation method of the sinusoidal voltage pulse width modulation waveform data based on the phase of the present invention is provided, and further in conjunction with the principle block diagram, each step of the method of the present invention is described in detail as follows:

[0026]1. The signal sig input to the frequency measurement part is a square wave pulse signal whose frequency is K times the frequency F of the fundamental wave component of the sinusoidal voltage pulse width modulation wave. Take K=(0.01~10)×N S , where N S is the number of phase sampling points in each fundamental cycle of the sinusoidal voltage PWM wave, or N S is the number of calculation and judgment of PWM wave data in each fundamental wave cycle, N S is a positive integer, and N S The larger the value, the higher the precision of the pulse data. There is a fixed clock signal clk in the frequency measurement part, and its frequency is F...

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Abstract

The invention relates to a method for producing waveform data with pulse-duration modulation of sine voltage. First is obtain the frequency measurement parameter Nf and the product XxNf. With waveform parameter of modulating wave and the parameter of constant amplitude ratio being selected, the variance of modulating wave of calculated. Under the control of clock pulse signal calculated, the waveform data of modulating wave is calculated based on the waveform parameter and the variance of modulating wave. The phase digital value can be obtained from counting the clock pulse signal calculated. Based on phase parameter of reference wave, the waveform data of reference wave is produced. The pulse level data can be gotten from comparing the waveform data of modulating wave with the waveform data of reference wave. Combining the pulse level data and phase counting value forms the waveform data with pulse-duration modulation. The waveform data with pulse-duration modulation of sine voltage produced by the invention provides good performances in harmonic wave and symmetry of each phase, and it provides convenient digital means for regulation and control.

Description

Technical field: [0001] The invention relates to a method for generating waveform data of sinusoidal voltage pulse width modulation based on phase, and belongs to the technical field of power electronics in power system control. Background technique: [0002] The sinusoidal voltage pulse width modulated wave is a rectangular pulse signal with a certain amplitude but variable pulse width, which contains a main sinusoidal voltage fundamental component. The sinusoidal voltage pulse width modulation wave is widely used in the inverter device of the power system. Under the control of this signal, the power electronic device can be turned on and off to realize the conversion of electric energy from DC to AC. Referring to the book "Power Electronics Technology" with the international standard number 7111056175, the basic method of generating a sinusoidal voltage pulse width modulation wave is to compare the amplitude of the modulation wave and the reference wave, and output high an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00
Inventor 庞浩王赞基
Owner TSINGHUA UNIV
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