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28 条记录 (耗时 0.011 秒)

    A control apparatus for rectifying circuits
    3.
    发明公开
    A control apparatus for rectifying circuits 失效
    控制装置，用于整流电路。

    公开(公告)号：EP0199903A2

    公开(公告)日：1986-11-05

    申请号：EP86101424.9

    申请日：1986-02-04

    申请人： HITACHI, LTD.

    发明人： Muto, Nobuyoshi ,  Sakai, Keijiro ,  Suzuki, Toshio ,  Ueda, Akiteru ,  Nando, Kenji ,  Okajima, Ikuo

    IPC分类号： H02M3/10

    CPC分类号： H02M3/157

    摘要： A single phase, full wave diode bridge circuit (20) is connected with a chopper (30) on its DC output side. The output voltage of the chopper (30) is smoothed by a smoothing capacitor (40) and thereafter supplied to a load (50). A current control apparatus (80-100) forms a current reference signal which is synchronized with an AC voltage applied to the bridge circuit (20) and has a magnitude corresponding to the current flowing through the load (50) and produces a deviation signal between the current reference signal and an actual AC input current of the bridge circuit (20). The chopper (30) is controlled in accordance with the deviation signal so that the AC input current follows the current reference signal, whereby the power factor and the waveform of the AC input current is improved.

    Inverter device
    4.
    发明公开
    Inverter device 有权
    Wechselrichtereinrichtung

    公开(公告)号：EP1152520A3

    公开(公告)日：2003-12-03

    申请号：EP01109397.8

    申请日：2001-04-19

    申请人： Hitachi, Ltd.

    发明人： Sakai, Keijiro ,  Okuyama, Toshiaki ,  Nakatsu, Kinya ,  Ishida, Seiji ,  Fujii, Hiroshi ,  Kato, Junji ,  Hiraga, Masahiro

    IPC分类号： H02M7/48

    CPC分类号： H02M7/48 ,  H02M7/53875 ,  H02P27/08

    摘要： An inverter device in the present invention comprises a three-phase inverter (2) for converting DC electric power into AC power for supplement to an AC electric motor (3) and a control device (4 - 11) operatively associated therewith, and said control device includes a phase current detection section (7, 8) for outputting a phase current waveform based on a DC input current and an operational processor section (4 - 6, 10, 11) for performing based on said phase current waveform operational processing for control of said inverter device. Thereby, the inverter device can be constructed to be very compact.

    摘要翻译： 本发明的逆变器装置包括一个三相逆变器（2），用于将直流电功率转换为交流电，以补充交流电动机（3）和与其可操作地相关联的控制装置（4-11），所述控制 装置包括用于基于直流输入电流输出相电流波形的相电流检测部分（7,8）和用于基于所述相电流波形的操作处理进行控制的操作处理器部分（4,6 - 10,11） 的所述逆变器装置。 因此，逆变器装置可以被构造成非常紧凑。

    Method and apparatus for controlling PWM inverters
    6.
    发明公开
    Method and apparatus for controlling PWM inverters 失效
    用于控制脉冲宽度调制的逆变器的方法和装置。

    公开(公告)号：EP0159000A2

    公开(公告)日：1985-10-23

    申请号：EP85104523.7

    申请日：1985-04-15

    申请人： HITACHI, LTD.

    发明人： Mutoh, Nobuyoshi ,  Sakai, Keijiro ,  Ueda, Akiteru ,  Ishibashi, Akira ,  Okajima, Ikuo

    IPC分类号： H02P7/63

    CPC分类号： H02P27/08 ,  H02M7/53875 ,  H02P23/04 ,  H02P25/024 ,  H02P27/047

    摘要： An AC motor (12) such as an induction motor or a synchronous motor is driven by a PWM inverter circuit (11). Power switching elements (Up, U N , Vp, V N , Wp, W N ) of the inverter circuit are ignited by PWM pulses resulting from comparision of a carrier wave signal with a sine wave modulation signal at a frequency proportional to a frequency setting signal (f R ) so as to control the inverter circuit. A current polarity detector (14) detects positive and negative components (I A , I B ) of a DC current I D ) flowing in the input side of the inverter circuit. The frequency setting signal is so corrected as to be decreased when only the positive current component flows in excess of one period of the carrier wave signal or increased when only the negative current component flows in excess of the one period.

    Control system for induction motor using inverter for AC power supply
    7.
    发明公开
    Control system for induction motor using inverter for AC power supply 失效
    对于使用逆变器作为交流发电机的感应电动机的控制系统。

    公开(公告)号：EP0053916A1

    公开(公告)日：1982-06-16

    申请号：EP81305711.4

    申请日：1981-12-03

    申请人： Hitachi, Ltd.

    发明人： Sakai, Keijiro ,  Matsuda, Yasuo ,  Honbu, Mitsuyuki

    IPC分类号： H02P7/62

    CPC分类号： H02P27/06 ,  H02P27/047

    摘要： A control system for an induction motor driven by an AC output of variable frequency and voltage produced from an inverter (4) which converts DC power obtained by a converter (2) through conversion of AC power having constant voltage and constant frequency. The system comprises means (8, 9, 10,11,13; 23, 24) for estimating the power factor of the induction motor from an input current to the inverter, means (8) for controlling the voltage of the AC output from the inverter when the estimated power factor is outside a predetermined range, and means (7, 8) for restricting the control of the AC output voltage to prevent the ratio between the AC output voltage and the AC output frequency from exceeding a predetermined range.

    摘要翻译： 在感应电动机的控制系统，通过从在逆变器（4）产生的可变频率和电压的交流输出哪通过具有恒定电压和恒定频率AC电力的转换由转换器（2）中得到的直流电源转换驱动。 该系统包括装置（8，9，10，11，13; 23，24），用于在输入电流从估计所述感应电机的功率因数给逆变器的装置（8），用于控制所述AC输出的从所述电压 逆变器当估计的功率因数是在预定范围之外，以及装置（7,8），用于限制所述AC输出电压的控制，以防止所述AC输出电压和超过预定范围的交流输出的频率之间的比率。

    Control method of pulse width modulation inverter and pulse width modulation inverter system
    8.
    发明公开
    Control method of pulse width modulation inverter and pulse width modulation inverter system 失效
    用于使用脉冲宽度调制和逆变器系统与脉冲宽度调制逆变器控制方法。

    公开(公告)号：EP0371442A1

    公开(公告)日：1990-06-06

    申请号：EP89121902.4

    申请日：1989-11-28

    申请人： HITACHI, LTD.

    发明人： Mutoh, Nobuyoshi ,  Sakai, Keijiro ,  Fujii, Hiroshi ,  Nantoh, Kenji

    IPC分类号： H02P7/628

    CPC分类号： H02P27/08 ,  H02M7/53873 ,  H02M2007/53876 ,  H02P23/0077

    摘要： In spatial vector control of a pulse width modulation (PWM) inverter (40) adapted for variable speed drive of an induction motor (50), a difference vector ( ẽ(n)) between magnetic flux vectors (φ̃ (n), φ̃ (n-1 ))occurring during adjacent sampling periods is generated by synthesizing a zero vector (V 0 , Ṽ 7 ) and voltage vectors ( Ṽ 1 - Ṽ 6 ) in such a manner that a resultant voltage vector always includes as component a minimum unit of zero vector or voltage vector, whereby even when the angular speed of rotation of the magnetic flux changes, the switching frequency of the PWM inverter is prevented from decreasing and the current ripple is reduced.

    摘要翻译： 在脉冲宽度调制（PWM）逆变器的空间矢量控制（40），适于（磁通矢量之间的感应电动机（50），的差矢量（@（n））的@（n）的变速驱动器@（ N-1））中的相邻采样周期发生的是由寻找的方式合成一个零矢量（@ 0，@ 7）和电压矢量（@ 1相似@ 6）产生做所得的电压矢量总是作为组分包括最小单元 的零矢量或矢量电压，从而即使当的磁通量的变化的旋转的角速度，所述PWM逆变器的开关频率从降低和电流波动减小防止。

    PWM inverter apparatus
    9.
    发明公开
    PWM inverter apparatus 失效
    Pulsbreitenmodulierte Wechselrichter-Einrichtung。

    公开(公告)号：EP0351783A2

    公开(公告)日：1990-01-24

    申请号：EP89113159.1

    申请日：1989-07-18

    申请人： HITACHI, LTD.

    发明人： Mutoh, Nobuyoshi ,  Sakai, Keijiro ,  Ueda, Akiteru ,  Fujii, Hiroshi

    IPC分类号： H02M7/529

    CPC分类号： H02M7/529 ,  H02P21/141

    摘要： Disclosed is a PWM inverter apparatus used for driving an a.c. motor, comprising: an inverter including an output part connected to the a.c. motor and switching elements on-off controlled by a PWM signal; a part (10) for receiving, at an interval of a given sampling period, status command information specifying a desired status of a vector of a rotating magnetic flux in the a.c. motor; a part (10) for predicting, on the basis of at least the status command information received at each sampling time, the status of the vector of the rotating magnetic flux which will be produced at next sampling time; a part (22) for calculating the difference between the status of the vector of the rotating magnetic flux specified by the status command information received at current sampling time and the predicted status of the vector of the rotating magnetic flux which will be produced at next sampling time; a part (21, 23, 24) for synthesizing the difference vector using ones selected from among a plurality of predetermined reference voltage vectors; and a part (30) for generating a PWM signal for controlling the switching elements of the inverter so as to produce the selected reference voltage vectors.

    摘要翻译： 公开了用于驱动交流电的PWM逆变器装置。 电动机，包括：逆变器，包括连接到所述交流电的输出部分。 电机和开关元件通断由PWM信号控制; 用于以给定采样周期的间隔接收指定所述a.c.中旋转磁通的向量的期望状态的状态命令信息的部分（10）。 发动机; 至少基于每个采样时刻接收到的状态命令信息来预测在下一个采样时刻产生的旋转磁通矢量的状态的部分（10） 用于计算由当前采样时间接收到的状态指令信息指定的旋转磁通矢量的状态与将在下一次采样时产生的旋转磁通矢量的预测状态之间的差的部分（22） 时间; 用于使用从多个预定参考电压矢量中选择的一个来选择差矢量的部分（21,23,24）; 以及用于产生用于控制逆变器的开关元件以产生所选择的参考电压矢量的PWM信号的部分（30）。