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12 条记录 (耗时 0.012 秒)

    Method and apparatus for controlling PWM inverter
    1.
    发明公开
    Method and apparatus for controlling PWM inverter 失效
    Verfahren und Vorrichtung zum Steuern eines Pulsdauermodulationswechselrichters。

    公开(公告)号：EP0140348A1

    公开(公告)日：1985-05-08

    申请号：EP84112921.6

    申请日：1984-10-26

    申请人： HITACHI, LTD.

    发明人： Mutoh, Nobuyoshi ,  Sakai, Keijiro ,  Hattori, Motonobu ,  Nagato, Yuichiro

    IPC分类号： H02M7/5387

    CPC分类号： H02M7/53873

    摘要： A method and an apparatus for producing a pulse width modulating signal to be used for operation of a PWM inverter wherein a modulating wave (U) of a sinusoidal waveform corresponding to the desired AC output voltage of the inverter is sampled at selected periodical time intervals (τ c ) to obtain a level of the modulating wave at each sampling point and the interval (Tu, Tv, Tw) is arithmetically determined between each sampling time point (A or C) and a time point (C or D) which appears between that sampling point and the next sampling point and at which time point a virtual triangular waveform (X) which has positive and negative peaks of a predetermined amplitude occurring alternately at the selected periodical time interval (τ c ), takes the same level as the sampled level of the modulating wave. On the basis of the time interval (Tu, Tv, Tw), the PWM signal (Eu, Ev, Ew) is produced.

    摘要翻译： 一种用于产生用于PWM逆变器的操作的脉宽调制信号的方法和装置，其中对应于逆变器的期望AC输出电压的正弦波形的调制波（U）以选定的周期时间间隔进行采样（ τc）以获得每个采样点处的调制波的电平，并且在每个采样时间点（A或C）与时间点（C或D）之间算术确定间隔（Tu，Tv，Tw） 该采样点和下一个采样点，并且在该时间点，具有以选定周期时间间隔（τc）交替出现的预定幅度的正和负峰值的虚拟三角波形（X）采取与采样相同的电平 调制波的电平。 基于时间间隔（Tu，Tv，Tw），产生PWM信号（Eu，Ev，Ew）。

    Inverter apparatus
    3.
    发明公开
    Inverter apparatus 失效
    Wechselrichtergerät。

    公开(公告)号：EP0130484A2

    公开(公告)日：1985-01-09

    申请号：EP84107109.5

    申请日：1984-06-20

    申请人： HITACHI, LTD.

    发明人： Murasaki, Shigeru ,  Hattori, Motonobu ,  Ishibashi, Akira ,  Nandoh, Kenji

    IPC分类号： H02M7/537

    CPC分类号： H02M7/53873

    摘要： @ This invention relates to an inverter comprising a frequency converter (2) for converting DC power to AC power, an oscillation control circuit (19) for stepwise generating a command value concerning the conversion condition of the frequency converter, and operation control means (13, 14) which, when the command value from the oscillation control circuit changes, controls the oscillation control circuit (19) to repetitively generate a plurality of times alternate new and old command values before and after change of command value. Particularly, this invention is to provide an inverter capable of continuing smooth operation even when the control system has a limited resolution.

    摘要翻译： 本发明涉及一种逆变器，包括用于将DC电力转换成AC电力的变频器（2），用于逐步产生与变频器的转换条件相关的指令值的振荡控制电路（19），以及操作控制装置（13， 14）当振荡控制电路的指令值变化时，控制振荡控制电路（19）在指令值变更前后重复产生多次交替的新旧指令值。 特别地，本发明是提供即使在控制系统具有有限分辨率的情况下能够继续平稳运行的逆变器。

    Control system for PWM inverter
    5.
    发明公开
    Control system for PWM inverter 失效
    Regelsystemfüreinen pulsweiten modulierten Wechselrichter。

    公开(公告)号：EP0241920A2

    公开(公告)日：1987-10-21

    申请号：EP87105543.0

    申请日：1987-04-14

    申请人： HITACHI, LTD.

    发明人： Mutoh, Nobuyoshi ,  Ueda, Akiteru ,  Hattori, Motonobu ,  Ibori, Satoshi ,  Shimonabe, Hideyuki ,  Nandoh, Kenji

    IPC分类号： H02P7/628

    CPC分类号： H02P27/08 ,  H02P27/047

    摘要： A control system for controlling a PWM inverter (4) so that the inverter drives an induction motor (6) at a variable voltage and a variable frequency while keeping constant a ratio of the output voltage of the inverter to the output frequency thereof, is disclosed which includes current component detecting means (51, 52, 7, 8, 9) for detecting an effective current (it) corresponding to a load, from the input current of the induction motor, frequency setting means (113, 11) for setting the output frequency of the PWM inverter, flux setting means (112) for setting the amount of magnetic flux generated in the induction motor, correcting frequency calculating means (13, 14, 164) for calculating a frequency correcting quantity (ω s ) proportional to the effective current, and correcting-flux calculating means (102) for calculating a flux correcting quantity proportional to the effective current. In a case where the detected effective current is judged to be less than a predetermined value, the frequency correcting quantity is added to the set output frequency to obtain an output frequency command, and the sum of the flux correcting quantity and the set amount of magnetic flux is multiplied by the value of the output frequency command to obtain an output voltage command, for the purpose of controlling the operation of the PWM inverter on the basis of the output frequency command and the output voltage command.

    摘要翻译： 公开了一种用于控制PWM逆变器（4）的控制系统，使得变频器以可变电压和可变频率驱动感应电动机（6），同时保持变频器的输出电压与其输出频率的比例恒定。 所述电流分量检测装置用于根据所述感应电动机的输入电流来检测与负载对应的有效电流（It），所述频率设定装置用于设定所述电流分量检测装置， PWM逆变器的输出频率，用于设定感应电动机中产生的磁通量的磁通量设定装置（112），用于计算与该正弦电压成比例的频率校正量（ω）的校正频率计算装置（13,14,164） 有效电流和校正通量计算装置（102），用于计算与有效电流成比例的磁通校正量。 在检测到的有效电流被判断为小于预定值的情况下，将频率校正量与设定的输出频率相加以获得输出频率指令，并且磁通校正量和设定的磁场量之和 为了根据输出频率指令和输出电压指令控制PWM逆变器的工作，磁通量乘以输出频率指令的值，得到输出电压指令。

    Control system for PWM inverter
    8.
    发明公开
    Control system for PWM inverter 失效
    PWM逆变器控制系统

    公开(公告)号：EP0241920A3

    公开(公告)日：1989-06-28

    申请号：EP87105543.0

    申请日：1987-04-14

    申请人： HITACHI, LTD.

    发明人： Mutoh, Nobuyoshi ,  Ueda, Akiteru ,  Hattori, Motonobu ,  Ibori, Satoshi ,  Shimonabe, Hideyuki ,  Nandoh, Kenji

    IPC分类号： H02P7/628

    CPC分类号： H02P27/08 ,  H02P27/047

    摘要： A control system for controlling a PWM inverter (4) so that the inverter drives an induction motor (6) at a variable voltage and a variable frequency while keeping constant a ratio of the output voltage of the inverter to the output frequency thereof, is disclosed which includes current component detecting means (51, 52, 7, 8, 9) for detecting an effective current (it) corresponding to a load, from the input current of the induction motor, frequency setting means (113, 11) for setting the output frequency of the PWM inverter, flux setting means (112) for setting the amount of magnetic flux generated in the induction motor, correcting frequency calculating means (13, 14, 164) for calculating a frequency correcting quantity (ω s ) proportional to the effective current, and correcting-flux calculating means (102) for calculating a flux correcting quantity proportional to the effective current. In a case where the detected effective current is judged to be less than a predetermined value, the frequency correcting quantity is added to the set output frequency to obtain an output frequency command, and the sum of the flux correcting quantity and the set amount of magnetic flux is multiplied by the value of the output frequency command to obtain an output voltage command, for the purpose of controlling the operation of the PWM inverter on the basis of the output frequency command and the output voltage command.

    Method and apparatus for controlling a PWM inverter
    10.
    发明公开
    Method and apparatus for controlling a PWM inverter 失效
    的方法和装置用于控制脉冲宽度调制的逆变器。

    公开(公告)号：EP0254290A2

    公开(公告)日：1988-01-27

    申请号：EP87110605.0

    申请日：1987-07-22

    申请人： HITACHI, LTD.

    发明人： Mutoh, Nobuyoshi ,  Ueda, Akiteru ,  Shimonabe, Hideyuki ,  Ibori, Satoshi ,  Hattori, Motonobu ,  Nandoh, Kenji ,  Yamasawa, Yuuzi

    IPC分类号： H02M7/5387 ,  H02M7/527

    CPC分类号： H02M7/5395 ,  H02M7/529

    摘要： A method and apparatus are disclosed for controlling a pulse width modulating (PWM) inverter controlled for ignition by a PWM pulse (E U , E V , E W ) produced with a carrier wave (g) and a modulation wave (e). The method comprises sampling an amplitude of the modulation wave (e) at a cycle rate related to the frequency of the carrier wave. The modulation wave and the carrier wave are synchronized when the sample modulation wave amplitude has a peak value (V R ) greater than an amplitude (H) of the carrier wave. The modulation wave and the carrier wave are asynchronized when the sampled modulation wave has a peak value less than the amplitude of the carrier wave.

    摘要翻译： 一种方法和装置游离缺失盘用于控制与载波（g）和一个调制波（e）中产生的脉冲宽度调制（PWM）逆变器通过PWM脉冲点火控制（EU，EV，EW）。 所述方法包括在与所述载波的频率的周期速率的调制波（e）中的振幅的采样。 调制波和载波同步当样品调制波振幅具有峰值（VR）比在载波的振幅（H）大。 调制波和载波的异步当采样调制波具有峰值小于所述载波的振幅。