Invention Application
- Patent Title: Modulation methods and apparatus for reducing common mode noise
- Patent Title (中): 用于降低共模噪声的调制方法和装置
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Application No.: US11435651Application Date: 2006-05-17
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Publication No.: US20070268051A1Publication Date: 2007-11-22
- Inventor: Russel J. Kerkman , Qiang Yin , Haihui Lu
- Applicant: Russel J. Kerkman , Qiang Yin , Haihui Lu
- Assignee: Rockwell Automation Tecnhologies, Inc.
- Current Assignee: Rockwell Automation Tecnhologies, Inc.
- Main IPC: H03K3/017
- IPC: H03K3/017

Abstract:
A method and apparatus for reducing common mode noise in a three phase pulse width modulated (PWM) system, the method comprising the steps of receiving the first, second and third modulating waveforms, identifying one of the modulating waveforms that is at least one of instantaneously the maximum and instantaneously the minimum of the modulating waveforms as a first identified waveform, wherein comparison of the first identified waveform to the carrier signal would generate a first on-off pulse sequence associated with a phase corresponding to the first identified waveform, generating switch control signals associated with the phase corresponding to the first identified waveform that cause a modified on-off pulse sequence that is phase shifted from the first pulse sequence, using the second and third modulating waveforms to generate second and third on-off pulse sequences corresponding to the second and third phases and providing the modified pulse sequence and the second and third pulse sequences to the one of the inverter and the converter.
Public/Granted literature
- US07649756B2 Common mode noise reduction in converter systems through modification of single phase switching signal Public/Granted day:2010-01-19
Information query
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