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1. 发明授权

US5099177A Lamp circuit with disconnected lamp detecting device 失效
标题翻译：灯电路断线检测装置
公开(公告)号：US5099177A
公开(公告)日：1992-03-24
申请号：US664749
申请日：1991-03-05
申请人： Shozo Taniguchi , Tomonori Okabe , Ryoji Doya , Kazutoyo Narita , Kiyoshi Noda , Katsuyuki Ueda
发明人： Shozo Taniguchi , Tomonori Okabe , Ryoji Doya , Kazutoyo Narita , Kiyoshi Noda , Katsuyuki Ueda
IPC分类号： H05B37/03
CPC分类号： H05B37/038
摘要： A plurality of current transformers connected in series provide secondary winding sides respectively connected to lamps. A constant-current source is provided to supply constant current to these lamps. Each lamp is connected to the corresponding terminal unit including a short-circuit switch for short-circuiting the secondary winding side of the transformer when the lamp is disconnected. A master station issues a request for detecting a disconnected lamp or checking whether or not failure occurs in the terminal unit to each terminal unit in the form of an instant power interruption. Each terminal unit has a proper identification time assigned thereto. In response to the request issued by the master station in the form of an instant power interruption, after the proper identification time for each terminal unit, the relevant terminal unit serves to turn off a short-circuit switch for opening the secondary winding side of the transformer for a predetermined time or, during the proper identification time, the terminal unit serves to control the short-circuit switch on and off according to a predetermined code to respond to the request issued by the master station. In the master station, the constant-current source reads the information from each terminal unit based on the waveform change of an output current and output voltage of the constant-current source so as to determine whether or not each lamp is disconnected, where the disconnected lamp is located, whether or not each terminal unit fails, and where the failed terminal unit is located.
摘要翻译：串联连接的多个电流互感器提供分别连接到灯的次级绕组侧。提供恒流源以向这些灯提供恒定电流。每个灯连接到相应的终端单元，包括短路开关，用于当灯断开时使变压器的次级绕组侧短路。主站发出检测断线灯的请求，或者以即时电源中断的形式检查终端单元到每个终端单元是否发生故障。每个终端单元具有适当的识别时间。响应于主站以瞬时电源中断的形式发出的请求，在每个终端单元的适当的识别时间之后，相关的终端单元用于关闭用于打开第二绕组侧的短路开关变压器预定时间，或者在适当的识别时间期间，终端单元用于根据预定代码来控制短路开关的接通和断开，以响应主站发出的请求。在主站中，恒流源基于恒定电流源的输出电流和输出电压的波形变化从每个终端单元读取信息，以便确定每个灯是否断开，其中断开无论每个终端单元是否发生故障，以及故障终端单元所在的位置。

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