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1. 发明授权

US5956523A Method and apparatus for reducing the number of RS232/RS485 transmission converters required for communicating between a PC and a plurality of instruments 失效
标题翻译：用于减少PC与多个仪器之间通信所需的RS232 / RS485传输转换器数量的方法和装置
公开(公告)号：US5956523A
公开(公告)日：1999-09-21
申请号：US694969
申请日：1996-08-09
申请人： Cheng-jen Chen
发明人： Cheng-jen Chen
IPC分类号： G06F13/40 , G06F13/00
CPC分类号： G06F13/4022
摘要： A communication system and method that reduces the number of converters required for communication between a personal computer and a plurality of instruments includes a master data transmission converter coupled to the personal computer and adapted to communicate with the personal computer and a plurality of branch data transmission converters. Each of the branch data converters being coupled to the master data transmission converter through an RS485 interface and one of the instruments through an RS232 interface. Each of the branch data transmission converters having a unique individual identity address code such that only one communication path is built between the master data transmission converter and a branch data transmission converter that has been addressed by an information signal from the personal computer via the master data transmission converter. Each of the branch data transmission converters controls the direction of data flow between the RS485 interface and the RS232 interface responsive to an interrupt activated by a respective one of the RS485 or RS232 interfaces.
摘要翻译：减少个人计算机和多个仪器之间通信所需的转换器数量的通信系统和方法包括耦合到个人计算机并适于与个人计算机通信的主数据传输转换器和多个分支数据传输转换器。每个分支数据转换器通过RS485接口和其中一个仪器通过RS232接口耦合到主数据传输转换器。每个分支数据传输转换器具有唯一的个人身份地址代码，使得仅在主数据传输转换器和分支数据传输转换器之间仅建立一条通信路径，分支数据传输转换器已经通过主数据从个人计算机的信息信号寻址传输转换器。每个分支数据传输转换器响应于由相应的一个RS485或RS232接口激活的中断，控制RS485接口和RS232接口之间的数据流动方向。

2. 发明授权

US4786854A Alternating current voltage regulator using a feedback loop with step filtering 失效
标题翻译：交流电压调节器使用带步进滤波的反馈回路
公开(公告)号：US4786854A
公开(公告)日：1988-11-22
申请号：US100487
申请日：1987-09-24
申请人： Kosuke Harada , Takazi Nakamizo , Cheng-Jen Chen
发明人： Kosuke Harada , Takazi Nakamizo , Cheng-Jen Chen
IPC分类号： G05F1/44 , G05F1/12
CPC分类号： G05F1/44
摘要： An AC voltage regulator includes an output voltage sensing and regulating device having a suitable filter characteristic to attenuate AC components therein occurring in the frequency ranges corresponding to the almost periodic oscillations or abnormal oscillations, or high frequency components of distorted waves which appear in the AC output voltage and are causes for such abnormal oscillations. The AC voltage regulator does not need to use a dummy load to suppress almost periodic oscillations even when the load is extremely small. The output voltage of the AC voltage regulator is free from abnormal oscillation components such as almost periodic oscillations and low frequency oscillations.
摘要翻译： AC电压调节器包括具有合适的滤波器特性的输出电压感测和调节装置，用于衰减出现在对应于几乎周期性振荡或异常振荡的频率范围内的AC分量，或出现在AC输出端的失真波的高频分量是这种异常振荡的原因。即使负载极小，交流电压调节器也不需要使用虚拟负载来抑制几乎周期性的振荡。交流电压调节器的输出电压无异常振荡分量，如几乎周期性振荡和低频振荡。

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