公开(公告)号：US5400206A

公开(公告)日：1995-03-21

申请号：US98484

申请日：1993-07-27

申请人： Kenneth F. Barnes ,  Jimmy Yee

发明人： Kenneth F. Barnes ,  Jimmy Yee

IPC分类号： H02H3/087 ,  H02H3/07

CPC分类号： H02H3/087

摘要： An overcurrent protection circuit is provided with a counter which permits a preselected number of reinitiations of current following the detection of an overcurrent condition. Each stoppage of current in response to the detection of an overcurrent condition is followed by a predetermined time delay and a subsequent reinitiation of current. After the predetermined number of reinitiations, current is permanently stopped from flowing between first and second circuit points until a manual reset occurs.

摘要翻译： 过电流保护电路设有一个计数器，该计数器允许在检测到过电流状态之后预先选择数量的电流。 响应于过电流状况的检测，电流的每个停止都遵循预定的时间延迟和随后的电流重新启动。 在预定次数的重新启动之后，电流永久地停止在第一和第二电路点之间流动，直到发生手动复位。

公开(公告)号：US5962845A

公开(公告)日：1999-10-05

申请号：US48372

申请日：1998-03-26

申请人： Jimmy Yee

发明人： Jimmy Yee

IPC分类号： G01J1/44 ,  G05F1/00

CPC分类号： G01J1/44 ,  G01J2001/444

摘要： A drive circuit for a photoelectric sensor which automatically adjusts the sensor response time with adjustments in the drive current to the light source based on a desired sensing distance. The drive circuit includes an oscillator for establishing an output signal having an output frequency. An output of the oscillator is provided as an input to an adjustable current source. The current source is connected to the light source for providing the drive current to the light source at the output frequency. A peak detector is connected to a lead of the light source for detecting a feedback voltage proportional to the drive current through the light source. The feedback voltage is provided as an input to the oscillator, and the output frequency of the oscillator is variable depending on the feedback voltage so that variations in the drive current result in corresponding variations in the output frequency and, therefore, the frequency of the drive current. With the sensor of the present invention, a single sensor can provide a continuously variable response time based on the application.

摘要翻译： 一种用于光电传感器的驱动电路，其基于期望的感测距离调整到光源的驱动电流来自动调节传感器响应时间。 驱动电路包括用于建立具有输出频率的输出信号的振荡器。 提供振荡器的输出作为可调电流源的输入。 电流源连接到光源，用于以输出频率向光源提供驱动电流。 峰值检测器连接到光源的引线，用于检测与通过光源的驱动电流成比例的反馈电压。 反馈电压被提供给振荡器的输入，并且振荡器的输出频率根据反馈电压而变化，使得驱动电流的变化导致输出频率和因此的驱动频率的相应变化 当前。 利用本发明的传感器，单个传感器可以基于该应用提供连续可变的响应时间。

公开(公告)号：US4689499A

公开(公告)日：1987-08-25

申请号：US759613

申请日：1985-07-25

申请人： Jimmy Yee

发明人： Jimmy Yee

IPC分类号： G01R19/165 ,  H03K17/795 ,  H03K17/95 ,  H03K5/153

CPC分类号： H03K17/7955 ,  G01R19/1659 ,  H03K17/95

摘要： An electronic circuit for interfacing a sensor of either current sourcing or current sinking type to a data bus requiring signals of predetermined characteristics, the circuit including first and second level comparators set to different reference levels so as to define a window between the reference levels at which neither comparator is actuated. A sensor input terminal is biased to a level between the reference levels of the comparators, but varies to a level outside the window in response to current flowing from or into the sensor terminal. The comparator output terminals are connected to an output circuit which produces a signal suitable for transmission on the data bus in response to actuation of either comparator.

摘要翻译： 一种用于将电流源或电流吸收型的传感器与需要预定特性的信号的数据总线接口的电子电路，所述电路包括设置为不同参考电平的第一和第二电平比较器，以便在参考电平 两个比较器都不启动。 传感器输入端子被偏置到比较器的参考电平之间的电平，但是响应于从传感器端子流入或流入传感器端子的电流而变化到窗口外部的电平。 比较器输出端子连接到输出电路，该输出电路响应于任一个比较器的驱动而产生适于在数据总线上传输的信号。

公开(公告)号：US5151591A

公开(公告)日：1992-09-29

申请号：US702566

申请日：1991-03-20

申请人： Donald D. Johnson ,  Jimmy Yee

发明人： Donald D. Johnson ,  Jimmy Yee

IPC分类号： G08B13/183 ,  H03K5/1252 ,  H03K5/19

CPC分类号： G08B13/183 ,  H03K5/1252 ,  H03K5/19

摘要： An asynchronous photodetector circuit is provided to interrogate incoming signals and determine whether the frequency of those incoming signal pulses is acceptable. The circuitry of the present invention permits a series of incoming pulses to be interrogated to determine whether the frequency of those pulses is acceptable and can be assumed with confidence to be emanating from an appropriate light source. Upon the receipt of a first input signal pulse, a time window is created by the present invention to define a period to time during which a subsequent input signal pulse is to be expected. Other than during the duration of the time window, the present invention will not accept an input signal pulse and will not count that pulse as having been received. Each properly received pulse creates a subsequent time window until a predetermined number of consecutive pulses is received during their time windows. When that predetermined number is received, a signal is provided. In a particularly preferred embodiment of the present invention, the signal that the predetermined number of consecutive pulses have been received is used to lower the threshold voltage of a comparator for the purpose of facilitating receipt of subsequent signals once the appropriateness of the incoming stream of pulses is determined.

摘要翻译： 提供异步光电检测器电路来询问输入信号并确定这些输入信号脉冲的频率是否可接受。 本发明的电路允许询问一系列进入脉冲以确定这些脉冲的频率是否可接受，并且可以假定从适当的光源发出。 在接收到第一输入信号脉冲时，通过本发明创建时间窗，以定义期望随后的输入信号脉冲的时间段。 除了在时间窗口的持续时间之外，本发明将不接受输入信号脉冲，并且不会将该脉冲计数为已经被接收。 每个适当接收的脉冲产生后续时间窗口，直到在其时间窗口期间接收到预定数量的连续脉冲。 当接收到该预定数量时，提供信号。 在本发明的一个特别优选的实施例中，一旦接收到输入的脉冲流的适当性，就使用已经接收了预定数量的连续脉冲的信号来降低比较器的阈值电压，以便于接收后续信号 决心，决意，决定。