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1. 发明授权

US5990577A Hub for local area network with backup power supply system 失效
标题翻译：配有备用电源系统的局域网集线器
公开(公告)号：US5990577A
公开(公告)日：1999-11-23
申请号：US047150
申请日：1998-03-24
申请人： Hideo Kamioka , Minoru Dendou , Yoshimi Kohda , Koji Kobayashi
发明人： Hideo Kamioka , Minoru Dendou , Yoshimi Kohda , Koji Kobayashi
IPC分类号： H02J7/00 , H02J9/06 , H04L12/10 , H04L12/44 , H02J3/02
CPC分类号： H04L12/10 , H02J7/0052 , H02J9/061 , H04L12/44 , Y10T307/367 , Y10T307/516 , Y10T307/625
摘要： A hub for a local area network according to one embodiment of the present invention includes a plurality of communication ports connected to each of nodes in the network, through which a signal is transmitted among the nodes, a signal processing circuit having at least the functions of repeating the signal among the nodes and reshaping a waveform thereof, and a power supply circuit for supplying a dc current for driving the signal processing circuit. The power supply circuit further comprises an ac/dc converter for converting an ac current applied from an external ac power supply without passing through a power switch thereto into a predetermined dc current and supplying the dc current to a load circuit including the signal processing circuit without passing through a power switch, a backup secondary battery, a charging circuit for trickle charging the dc current output from the ac/dc converter into the backup secondary battery, and a control circuit for opening and closing a current path for supplying an output current of the backup secondary battery to the load circuit.
摘要翻译：根据本发明的一个实施例的用于局域网的集线器包括连接到网络中的每个节点的多个通信端口，通过它们在节点之间传输信号，信号处理电路至少具有以下功能：在节点之间重复信号并重新形成其波形，以及用于提供用于驱动信号处理电路的直流电流的电源电路。电源电路还包括用于将从外部交流电源施加的交流电流转换而不通过其中的电源开关到达预定直流电流并将直流电流提供给包括信号处理电路的负载电路的交流/直流转换器，而没有通过电源开关，备用二次电池，用于将从AC / DC转换器输出的直流电流涓流充电到备用二次电池的充电电路，以及控制电路，用于打开和关闭用于提供输出电流的电流路径备用二次电池到负载电路。

2. 发明授权

US06420906B1 FET-OR circuit and power supply circuit using the same 有权
公开(公告)号：US06420906B1
公开(公告)日：2002-07-16
申请号：US09813878
申请日：2001-03-22
申请人： Yoshimi Kohda
发明人： Yoshimi Kohda
IPC分类号： H03K19094
CPC分类号： H03K17/302 , H02J9/061 , H02J2009/068 , H03K17/693 , H03K2017/307 , Y10T307/414 , Y10T307/549
摘要： An OR circuit allowing one stable output voltage from a plurality of input voltages is disclosed. A first FET is connected between a corresponding input terminal and an output terminal in such a manner that an inherent diode of the FET is connected in a forward direction. A second FET is connected between a corresponding input terminal and the output terminal in the same manner as the first FET. Each of the input voltages is compared with the output voltage. The conduction/non-conduction states of each of the first and second FETs are independently controlled depending on the comparison result.

3. 发明授权

US06839872B2 Media converter and failure detection technique 失效
标题翻译：介质转换器和故障检测技术
公开(公告)号：US06839872B2
公开(公告)日：2005-01-04
申请号：US09947565
申请日：2001-09-07
申请人： Yoshimi Kohda
发明人： Yoshimi Kohda
IPC分类号： H04B3/46 , H04L12/26 , G01R31/28
CPC分类号： H04L69/323 , H04L43/50 , H04L69/08
摘要： A media converter allowing a test mode to be activated from cable side and allowing easy detection of a failure and failure location is disclosed. A media converter includes first and second physical-layer interfaces and a memory connected between the first and second physical-layer interfaces to temporarily storing received data. When a trigger signal has been received at one of the first and second physical-layer interfaces, a response signal to the trigger signal is sent from a corresponding physical-layer interface back to a source that transmitted the trigger signal. The trigger signal is one of a specified modulation link signal and a packet having an illegal length that is not permitted in a network to which the media converter belongs.

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