公开(公告)号：US5412624A

公开(公告)日：1995-05-02

申请号：US135853

申请日：1993-10-13

Applicant: Thomas M. Yocom

Inventor： Thomas M. Yocom

IPC: G04G3/00 ,  G04G7/00 ,  G04B5/00 ,  H03L7/00 ,  G04B17/12 ,  G06F15/20

CPC classification number: G04G7/00 ,  G04G3/00

Abstract: A system and method for controlling time-critical functions by dynamically adjusting the interrupt frequency of a microprocessor. Interrupts are generated at a predetermined frequency. Time-critical functions are then performed in response to the interrupts. The interval is adjusted based on timing data from a substantially accurate source. Where the interval is measured in terms of clock pulses, a non-integer number of pulses per interval is attained by varying the number of pulses per interval so that the average over a number of intervals is equal to the non-integer number of pulses per interval. The interval is further adjusted using a selected damping coefficient to eliminate an underdamped condition.

Abstract translation: 通过动态调整微处理器的中断频率来控制时间关键功能的系统和方法。 以预定频率产生中断。 然后响应中断执行时间关键的功能。 基于来自基本准确的源的定时数据来调整间隔。 在以时钟脉冲测量间隔的情况下，通过改变每个间隔的脉冲数来获得每个间隔的非整数个脉冲，使得多个间隔上的平均值等于每一个的非整数个脉冲 间隔。 使用选定的阻尼系数进一步调整间隔以消除欠阻尼状态。

公开(公告)号：US5031110A

公开(公告)日：1991-07-09

申请号：US396152

申请日：1989-08-21

Applicant: Thomas M. Yocom

Inventor： Thomas M. Yocom

IPC: H01H9/16

CPC classification number: H01H9/167

Abstract: A microcomputer repetitively samples a signal representative of the instantaneous state of an electrical contact and initiates a count in response to the first sample which indicates a contact state different from a stored status of the contact. The microprocessor counts up for samples indicating an active state of the contact and down for inactive samples. If the count increases to a predetermined count representing a certain net count of active samples when the stored status is inactive, the stored status is changed to active. Similarly, the stored status is changed from active to inactive if the count decreases to a predetermined count representing a certain net count of inactive samples. The time of the first sample which indicates a contact state different from the stored status of the contact is stored as a temporary time. If the stored contact status is changed, the stored temporary time is saved as the valid time of the change in status. The microcomputer maintains lists of contacts having an active status and those having an inactive status and keeps track of a separate sample count for each contact monitored.

Abstract translation: 微型计算机重复地对代表电接触的瞬时状态的信号采样，并响应于指示与接触的存储状态不同的接触状态的第一样品启动计数。 微处理器对于指示接触的活动状态的样本进行计数，而对于非活动样本，微处理器向上计数。 如果当存储状态不活动时计数增加到表示活动样本的某个净计数的预定计数，则将存储的状态改变为活动状态。 类似地，如果计数减少到表示非活动样本的某个净计数的预定计数，则将存储状态从活动状态改变为非活动状态。 指示与接触的存储状态不同的接触状态的第一样本的时间被存储为临时时间。 如果存储的联系人状态发生变化，存储的临时时间将保存为状态更改的有效时间。 微型计算机维护具有活动状态的联系人列表和具有不活动状态的联系人列表，并且跟踪所监视的每个联系人的单独的样本计数。

公开(公告)号：US5027297A

公开(公告)日：1991-06-25

申请号：US414999

申请日：1989-09-29

Applicant: James P. Garitty ,  Thomas M. Yocom

Inventor： James P. Garitty ,  Thomas M. Yocom

IPC: G04G99/00 ,  G06F11/34 ,  G06F17/40

CPC classification number: G04G99/00 ,  G06F11/3495 ,  H02H1/0061

Abstract: Events at spaced locations, such as contact activity in the protective relays of an electric power distribution network, are time stamped using a single remote clock by a system which includes one or more slave stations monitoring the events. Each slave station initiates a count of locally generated clocking pulses of fixed duration upon detection of the first event monitored by it. Identification of the first event is stored in a first slot in memory. Additional memory slots each store the identification of a subsequent event and the count at the occurrence of that subsequent event. Upon command from a remote master station, the current count is stored in the first slot and the contents of the first slot and of the additional slots are transmitted over a communications network to the master station. The master station calculates the absolute time of each event using its master clock, the transmitted counts, the fixed duration of the clocking pulses, and the transmission time required to transmit the data from the particular slave station to the master station. The master station then sends a clear command to reset the count and clear the memory slots. If the number of events detected by a slave station before a clear command is received exceeds the number of memory slots available, the information on the first event stored in the first slot is retained, and the additional slots retain data on as many of the most recent events as there are additional slots.

Abstract translation: 间隔位置的事件，例如配电网络的保护继电器中的接触活动，使用包括监视事件的一个或多个从站的系统使用单个远程时钟进行时间戳。 每个从站在检测到由其监控的第一个事件时，启动固定持续时间的本地产生的定时脉冲计数。 第一个事件的识别被存储在存储器的第一个槽中。 附加的存储器插槽每个存储后续事件的标识以及在后续事件发生时的计数。 根据来自远程主站的命令，当前计数被存储在第一时隙中，并且第一时隙和附加时隙的内容通过通信网络发送到主站。 主站使用其主时钟，发送计数，定时脉冲的固定持续时间以及将数据从特定从站发送到主站所需的传输时间来计算每个事件的绝对时间。 然后，主站发送清除命令来重置计数并清除内存插槽。 如果在接收到清除命令之前由从站检测到的事件数量超过可用的存储器插槽的数量，则保留存储在第一时隙中的第一事件的信息，并且附加插槽将数据保留在最多的 最近的事件，因为有额外的插槽。