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Load control system and method for disconnecting sub-bus from main-bus
| Details |
Inventors: Minagawa, Yoshiji; Shirakawa, Hiroshi; Yamazaki, Hiroshi; Ito, Yoshiaki;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo-to, JP)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Ip; Paul
Attorney, Agent or Firm: Lowe, Price, Leblanc, Becker & Shur
Load control system is for disconnecting abnormal sub-bus from main-bus; The load control system has switching circuit (50+51) for connecting the sub-bus (1A, 1B . . . 1N) to the main-bus (2) or disconnecting sub-bus (1A, 1B, . . . 1N) from the main-bus (2) and bus watch device (30A, 30B . . . 30N) for detecting abnormal state of the sub-bus and for operating the switching means to disconnect the abnormal sub-bus from the main-bus (2). |
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DETAILED DESCRIPTION It is an object of the present invention to provide simple structured load control system and method for disconnecting abnormal sub-bus thereby.
A load control system in accordance with present invention comprises: plural sub-buses whereto at least one of the controllers is connected, a main-bus for commonly connecting the plural sub-buses, the main-bus and the plural sub-buses together constituting the bus, plural switching means provided in the plural sub-buses for connecting the each sub-bus to the main-bus or disconnecting the each sub-bus from the main bus, bus watch means for operating the switching means in a manner to disconnect the sub-bus from the main-bus when an abnormal signal is detected on the sub-bus and the main-bus, and to connect the sub-bus to the main-bus when a normal signal is detected on the sub-bus and the main-bus.
A load control system in accordance with present invention comprises: plural sub-buses whereto at least one of the controllers is connected, a main-bus for commonly connecting the plural sub-buses, the main-bus and the plural sub-bus together constituting the bus, main-bus watch means for watching the main-bus, comprising plural switching circuits for controlling feeding of power to the controllers connected respectively to sub-buses, and a control circuit for detecting abnormal sub-bus by opening and closing the switch circuits in a predetermined order when an abnormal signal on the main-bus is detected.
A method for disconnecting abnormal sub-bus in accordance with present invention comprises: first step for disconnecting sub-bus from main-bus by operating a switching circuit when abnormal detection signal is issued in detecting circuit for detecting abnormal signal sent to sub-bus, second step for discriminating whether sub-bus is abnormal or not by receiving signal from controller connected to the sub-bus when the sub-bus is disconnected, third step for connecting the sub-bus to the main-bus by operating the switching circuit when the sub-bus is not abnormal, and fourth step for maintaining the switching circuit open when the sub-bus is abnormal
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