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公开(公告)号：US4516185A
公开(公告)日：1985-05-07
申请号：US537705
申请日：1983-09-30
CPC分类号： H03K17/731 , H01H47/04 , H01H47/325
摘要： A system for controlling current flow to the actuating coil of a contactor or the like. A solid state switch is provided for gating current flow to the coil, and operated by an oscillator stage. A time delay causes the oscillator to operate at a high duty cycle when power is initially applied, allowing a relatively high current to flow to the contactor coil to operate the contacts. Subsequently the control causes the oscillator to operate at a low duty cycle, wherein the solid state switch passes a significantly lower current flow to the coil to maintain the contacts in position.
摘要翻译： 用于控制到接触器等的致动线圈的电流的系统。 提供固态开关，用于门控流向线圈的电流，并由振荡器级操作。 时间延迟使振荡器在最初施加功率时以高占空比工作，允许相对高的电流流向接触器线圈以操作触点。 随后，该控制使得振荡器在低占空比下工作，其中固态开关将明显更低的电流流向线圈以将触点维持在适当位置。
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2.发明授权
公开(公告)号：US4612617A
公开(公告)日：1986-09-16
申请号：US471302
申请日：1983-03-02
CPC分类号： G01R21/133
摘要： A method and a device for monitoring instantaneous electrical parameters of a power distribution system under load utilizing digital control means. An analog signal equivalent to such a parameter is sensed and rated down for processing by solid state components. This signal is converted into a binary coded digital signal having n digits. A plurality of digital signals is sampled and squared values with a format of 2n digits are derived from each sample. The squared values of one sampling period are accumulated to a sum value composed of 2n+m digits and the square root comprising n+k digits of the sum is taken. This value is rescaled to a true root mean square value by performing k left shifts as an accurate measurement result. The core of such device is represented by a microcomputer with built-in analog-to-digital converter.
摘要翻译： 一种利用数字控制装置在负载下监视配电系统的瞬时电气参数的方法和装置。 感测和等同于这样一个参数的模拟信号，并将其定为固态组件进行处理。 该信号被转换成具有n位数的二进制编码数字信号。 对多个数字信号进行采样，并从每个样本导出格数为2n位的平方值。 一个采样周期的平方值被累加到由2n + m位数组成的和值，并且采用包括和的n + k个数字的平方根。 通过执行k左偏移作为精确的测量结果，将该值重新缩放到真正的均方根值。 这种器件的核心由具有内置模数转换器的微型计算机表示。
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公开(公告)号：US4423459A
公开(公告)日：1983-12-27
申请号：US365554
申请日：1982-04-05
CPC分类号： H02H3/44 , H02H3/0935
摘要： A control for an AC circuit protection system which is capable of monitoring either single phase or polyphase current flow. The composite current envelope is periodically sampled and the sample values converted into digital form. Succeeding current signals are tested to determine whether they deviate from previous samples by a given amount. Non-deviant samples increment a first counter, while deviant samples increment a second counter. The ratio of the counts is used to recognize current imbalance and control system parameters are adjusted to compensate for the imbalance.
摘要翻译： 一种能够监测单相或多相电流的交流电路保护系统的控制。 复合电流包络被周期性地采样，并将样本值转换为数字形式。 测试成功的电流信号，以确定它们是否偏离先前的样品一定量。 非偏差样本增加第一个计数器，而异常样本增加第二个计数器。 计数的比例用于识别当前的不平衡，并且调整控制系统参数以补偿不平衡。
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