公开(公告)号：US20090161392A1

公开(公告)日：2009-06-25

申请号：US11960430

申请日：2007-12-19

Applicant: HONG ZHANG ,  Jeremy Eng

Inventor： HONG ZHANG ,  Jeremy Eng

IPC: H02M7/537

CPC classification number: H02M7/5387 ,  H02M2007/4803

Abstract: A control system for a PWM inverter may reduce a DC component of an output of the inverter. An output voltage signal may be attenuated with a low-pass filter to produce a signal with a high DC content. A duty cycle of an output of the low pass filter may be determined with a zero-crossing detector. A calculation may be performed to determine a magnitude of a DC offsetting voltage that may offset the DC component of the inverter output. The inverter may be commanded to produce a DC offsetting voltage with an opposite polarity from the DC component of the inverter output. The opposite polarity DC offsetting voltage may effectively cancel the DC component of the inverter output. A monitoring system may employ an alternate system for determining the level of the DC component, thus providing a desirable redundancy to the system.

Abstract translation: 用于PWM逆变器的控制系统可以减小逆变器的输出的直流分量。 输出电压信号可以用低通滤波器衰减，以产生具有高DC含量的信号。 低通滤波器的输出的占空比可以用过零检测器来确定。 可以执行计算以确定可抵消逆变器输出的DC分量的DC抵消电压的幅度。 可以命令逆变器产生与逆变器输出的直流分量相反极性的直流偏移电压。 相反极性的直流偏移电压可以有效地抵消逆变器输出的直流分量。 监视系统可以采用用于确定DC分量的级别的替代系统，从而为系统提供期望的冗余。

公开(公告)号：US07830682B2

公开(公告)日：2010-11-09

申请号：US11960430

申请日：2007-12-19

Applicant: Hong Zhang ,  Jeremy Eng

Inventor： Hong Zhang ,  Jeremy Eng

IPC: H02M1/12

CPC classification number: H02M7/5387 ,  H02M2007/4803

Abstract: A control system for a PWM inverter may reduce a DC component of an output of the inverter. An output voltage signal may be attenuated with a low-pass filter to produce a signal with a high DC content. A duty cycle of an output of the low pass filter may be determined with a zero-crossing detector. A calculation may be performed to determine a magnitude of a DC offsetting voltage that may offset the DC component of the inverter output. The inverter may be commanded to produce a DC offsetting voltage with an opposite polarity from the DC component of the inverter output. The opposite polarity DC offsetting voltage may effectively cancel the DC component of the inverter output. A monitoring system may employ an alternate system for determining the level of the DC component, thus providing a desirable redundancy to the system.

Abstract translation: 用于PWM逆变器的控制系统可以减小逆变器的输出的直流分量。 输出电压信号可以用低通滤波器衰减，以产生具有高DC含量的信号。 低通滤波器的输出的占空比可以用过零检测器来确定。 可以执行计算以确定可抵消逆变器输出的DC分量的DC抵消电压的幅度。 可以命令逆变器产生与逆变器输出的直流分量相反极性的直流偏移电压。 相反极性的直流偏移电压可以有效地抵消逆变器输出的直流分量。 监视系统可以采用用于确定DC分量的级别的替代系统，从而为系统提供期望的冗余。