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Method and device for PWM (pulse width modulation) of three-phase carrier waves

A technology of three-phase carrier wave and modulation method, which is applied in the field of control, can solve the problems of large PWM common-mode voltage, achieve the effects of reducing common-mode voltage, improving anti-electronic interference characteristics, and reducing common-mode leakage current

Inactive Publication Date: 2013-11-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The PWM modulates the three-phase triangular carrier in the same phase, and the output PWM common-mode voltage is relatively large, which is likely to cause adverse effects such as ground leakage current and electromagnetic interference.

Method used

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  • Method and device for PWM (pulse width modulation) of three-phase carrier waves
  • Method and device for PWM (pulse width modulation) of three-phase carrier waves
  • Method and device for PWM (pulse width modulation) of three-phase carrier waves

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Embodiment Construction

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0041] figure 1 It is a flowchart of a three-phase carrier PWM modulation method provided by an embodiment of the present invention. Such as figure 1 As shown, the three-phase carrier PWM modulation method provided in this embodiment can be specifically applied to a PWM modulation process in an inverter. The three-phase carrier PWM modulation m...

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Abstract

The invention provides a method and a device for PWM (pulse width modulation) of three-phase carrier waves. The method for PWM of the three-phase carrier waves comprises the steps of: producing sinusoidal modulation signals and three-wave carrier waves, wherein each phase of carrier waves of the three-phase carrier waves comprises two carrier waves which are stacked in the forward direction, and each two phases of carrier waves are provided with a phase difference with a preset phase angle therebetween; carrying out modulation on the sinusoidal modulation signals through the three-phase carrier waves, generating pulse width modulation (PWM) signals, and outputting the PWM signals to an electronic switch of an inverter so as to control on-off of the electronic switch. The method and the device provided by the embodiment of the invention for PWM of the three-phase carrier waves reduce common-mode voltage and common-mode leakage current outputted by the inverter, and improve the characteristic of electronic interference resistance of the inverter.

Description

technical field [0001] Embodiments of the present invention relate to control technologies, and in particular to a three-phase carrier PWM modulation method and device. Background technique [0002] Pulse Width Modulation (PWM for short) technology is to obtain the required waveform equivalently by modulating the width of a series of pulses. PWM technology is widely used in measurement, communication and power conversion control. [0003] In the prior art, the PWM signal of the three-level inverter is usually realized by the sinusoidal pulse width modulation (Sinusoidal Pulse Width Modulation, referred to as SPWM) method, which usually generates a driving signal by comparing the sinusoidal modulation signal with two triangular carriers. The switching device IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) is turned on and off, and the modulated pulse wave is equivalent to a sinusoidal or other shaped modulation signal. The PWM modulates the three-ph...

Claims

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Application Information

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IPC IPC(8): H02M7/537H02M1/44
Inventor 辛凯刘云峰邓健
Owner HUAWEI TECH CO LTD
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