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Multi-frequency uniformization carrier slope random distribution pulse width modulation method

A pulse width modulation, random distribution technology, applied in pulse generation with predetermined statistical distribution of parameters, output power conversion device, conversion of AC power input to DC power output, etc., to reduce electromagnetic interference, expand distribution range, reduce Effects of mechanical vibration and noise

Active Publication Date: 2019-04-05
NAVAL UNIV OF ENG PLA
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the output harmonic of the random pulse width modulation technology has a prominent maximum single harmonic spectrum amplitude and dense distribution of harmonic spectral lines near the low multiple carrier frequency, and proposes a multiple Frequency equalization carrier slope random distribution pulse width modulation method; this method combines the principle of "equivalent carrier frequency doubling" in carrier phase shift pulse width modulation and carrier slope random distribution pulse width modulation technology, which can be used without changing the random carrier Under the premise of sequence mean and variance, the frequency domain distribution bandwidth of harmonics is greatly improved, and multiple harmonic peaks near the carrier and its multiplier are evenly distributed in a wider frequency domain

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  • Multi-frequency uniformization carrier slope random distribution pulse width modulation method
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  • Multi-frequency uniformization carrier slope random distribution pulse width modulation method

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The present invention is a multi-frequency multiplier homogenization carrier slope random distribution pulse width modulation method, which can increase the carrier frequency equivalently by carrier phase-shifting pulse width modulation, and at the same time, combine the carrier slope random distribution pulse width modulation technology to disperse the carrier and its surrounding frequency multiplication Harmonic peak value, that is: use multi-octave homogenization carrier slope random distribution pulse width modulation method to increase the equivalent bandwidth of symmetrically distributed harmonics centered on each multiple carrier frequency, to achieve uniform distribution of harmonics in the frequency domain the goal of.

[0032] When using the multi-frequency multiplier homogenization carrier slope random distribution p...

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Abstract

The invention discloses a multi-frequency equalization carrier slope random distribution pulse width modulation method to increase the equivalent bandwidth of symmetrically distributed harmonics centered on multiple carrier frequencies to realize the increase of the uniform distribution of the harmonics in a frequency domain. The method comprises steps of (1) selecting a required random carrier sequence and a modulated wave and comparing the two to generate a switching device driving signal for pulse width modulation; (2) determining a multiple n of an equivalent carrier frequency f of the random carrier sequence and selecting a main circuit topology; and (3) inputting the switching device driving signal generated in the step (1) to the main circuit topology in the step (2) and performingmulti-frequency equalization carrier slope random distribution pulse width modulation. The method of the invention can greatly improve the frequency domain distribution bandwidth of the harmonics without changing the mean and variance of the random carrier sequence, and realize the more uniform distribution of a plurality of harmonic peaks near the carrier and the multiplier thereof in a wider frequency domain.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and specifically refers to a multi-frequency multiplier uniform carrier slope random distribution pulse width modulation method. Background technique [0002] In power electronics technology, pulse width modulation technology with fixed switching frequency has been widely used, but its output harmonics have a large number of peaks near the switching frequency and its multiplier, and these harmonics are the main cause of noise and mechanical vibration. [0003] Researchers often achieve the purpose of suppressing electromagnetic interference, vibration and noise reduction by adding filters and vibration and noise reduction equipment. The disadvantages of these methods are obvious, such as the high cost of the active filter, the complexity of harmonic detection and compensation; the slow dynamic response of the passive filter, and the poor filtering effect on the fast changing process; th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M7/483
CPCH02M1/08H02M7/483H03K3/84H02M1/12H02M7/5387
Inventor 许杰聂子玲朱俊杰吴廷好叶伟伟韩一孙兴法徐文凯原景鑫
Owner NAVAL UNIV OF ENG PLA
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