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    • 2. 发明授权
    • Over-speed preventing apparatus for DC motor
    • 直流电机超速防止装置
    • US4031439A
    • 1977-06-21
    • US595365
    • 1975-07-11
    • Yoshio SakaiToshiaki Kurosawa
    • Yoshio SakaiToshiaki Kurosawa
    • B66B1/24B66B1/30B66B5/02B66B5/06H02P3/08H02P7/34H02P7/06
    • B66B5/06B66B1/30H02P7/347Y10S388/902Y10S388/903Y10S388/917
    • An over-speed preventing apparatus for the DC motor comprises a DC motor the speed of which is controlled by the adjustment of the armature voltage thereof, controlled-rectifier means for supplying power to the separately excited field winding of the motor, means for generating a predetermined field current command, means for detecting the field current, and a constant current control system for controlling the rectifier means in accordance with the error between the field current command and the detected value of the field current. The apparatus further comprises a unidirectional element connected in parallel to the field winding in the direction in which the field current is made to flow back, current decrease detector means inserted between the rectifier circuit and the parallel circuit including the field winding and the unidirectional element, and protecting means energized by the current decrease detector means.
    • 用于直流电动机的超速防止装置包括直流电动机,其速度通过其电枢电压的调节来控制,用于向电动机的分别激励的励磁绕组供电的受控整流装置, 预定励磁电流指令,用于检测励磁电流的装置;以及恒流控制系统,用于根据励磁电流指令与励磁电流的检测值之间的误差来控制整流装置。 该装置还包括一个与励磁绕组并联连接的励磁电流使其流回的方向的单向元件,插入在整流电路和包括励磁绕组和单向元件的并联电路之间的电流减小检测装置, 以及由电流降低检测器装置通电的保护装置。
    • 10. 发明授权
    • Passive optical network system and method of data transmission in the passive optical network
    • 无源光网络中的无源光网络系统和数据传输方法
    • US07920791B2
    • 2011-04-05
    • US12073037
    • 2008-02-28
    • Yoshio SakaiKazuyuki Mori
    • Yoshio SakaiKazuyuki Mori
    • H04J14/00
    • H04L1/0041H04B10/272H04L1/0063H04L1/0078H04Q11/0067H04Q2011/0086
    • Regarding the passive optical network (PON) system of the present invention, in an OLT, data of different bit rates is framed, and framed data rows are subjected to FEC encoding processing without changing the line up of the data, and a check bit is added to the end of the frame, and an optical signal that has been modulated in accordance with the data row to which the check bit has been added is transmitted to the optical transmission line. Then in an ONU that corresponds to a high speed bit rate to which an optical signal from the OLT has been applied via a power splitter, forward error correction of the reception data is performed. As a result in a PON system in which data of different bit rates coexist, the minimum reception rate of a high speed ONU can be improved without having an influence on a low speed ONU.
    • 关于本发明的无源光网络(PON)系统,在OLT中,不同比特率的数据被成帧,并且成帧的数据行经受FEC编码处理而不改变数据的排队,并且校验位 加到帧的结尾,并且已经根据添加有校验位的数据行调制的光信号被发送到光传输线。 然后,在对应于通过功率分配器施加了来自OLT的光信号的高速比特率的ONU中,执行接收数据的前向纠错。 结果,在不同比特率的数据共存的PON系统中,可以提高高速ONU的最小接收速率,而不会对低速ONU产生影响。