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1. 发明授权

US4241372A Power supply protective circuit 失效
标题翻译：电源保护电路
公开(公告)号：US4241372A
公开(公告)日：1980-12-23
申请号：US16411
申请日：1979-03-01
申请人： Kay G. Sears
发明人： Kay G. Sears
IPC分类号： H02H3/07 , H02H3/087 , H02H3/093
CPC分类号： H02H3/07 , H02H3/087
摘要： A protective system interposed between a d-c power supply and an external load to isolate the supply from the load should the current drawn therefrom exceed a predetermined threshold value, the system distinguishing between a transitory overload and a continuous overload condition. The system includes a current-sensing resistor connected in series with the supply and the load and a comparator responsive to the voltage drop developed across the resistor to produce an output signal which activates a relay to cut off the delivery of current to the load only when the current exceeds the threshold value. Also included is a sampling circuit which upon activation of the relay functions after a brief sampling interval to automatically de-activate the relay and thereby reconnect the supply to the load, causing the comparator to again determine whether the existing current drain is still excessive, in which event the relay is again activated and the sampling cycle repeated. A timing-out circuit operates in conjunction with the sampling circuit to permit the sampling cycle to continue repetitively as long as an overcurrent condition is sensed. However, at the conclusion of a timing-out period which is a multiple of the sampling interval, if an overcurrent condition still exists, the timing-out circuit acts to reactivate the relay and cut off the delivery of current to the load and to hold the relay in its activated state.
摘要翻译：其中介于d-c电源和外部负载之间以将电源与负载隔离的保护系统应当从其中抽出的电流超过预定阈值，该系统区分暂时过载和连续过载状况。该系统包括与电源和负载串联的电流检测电阻器和响应于电阻器两端产生的电压降的比较器，产生输出信号，该输出信号激活继电器以仅在当电流超过阈值。还包括采样电路，其在短暂采样间隔之后激活继电器功能以自动停用继电器，从而将电源重新连接到负载，使得比较器再次确定现有的电流消耗是否仍然过大，再次激活继电器并重复采样周期。定时电路与采样电路一起工作，只要检测到过电流条件，允许采样周期重复继续。然而，在采样间隔的倍数的结束时，如果过电流状况仍然存在，则超时电路用于重新激活继电器并切断对负载的电流传递并保持继电器处于其激活状态。

2. 发明授权

US4202023A Overload protector 失效
标题翻译：过载保护器
公开(公告)号：US4202023A
公开(公告)日：1980-05-06
申请号：US858371
申请日：1977-12-07
申请人： Kay G. Sears
发明人： Kay G. Sears
IPC分类号： H02H3/06 , H02H3/087 , H02H3/08
CPC分类号： H02H3/06 , H02H3/087
摘要： A rapid-response overload protector interposed between a voltage source and a load powered thereby, the protector effectively decoupling the load from the source when the current drawn thereby exceeds a predetermined limit indicative of an overload condition. The protector includes an automatic resetting stage that periodically samples the state of the load and acts to restore the normal supply of current thereto when the current drawn by the load during the sampling interval falls below the limit.
摘要翻译：一种插入在电压源和由此供电的负载之间的快速响应过载保护器，当由此引起的电流超过表示过载状况的预定极限时，保护器有效地将负载与源分离。保护器包括自动复位阶段，当在采样间隔期间由负载拉出的电流低于极限时，周期性地对负载状态进行采样并且用于恢复正常的电流供应。

3. 发明授权

US4096540A Protective relay circuit for regulated power supply 失效
标题翻译：用于稳压电源的保护继电器电路
公开(公告)号：US4096540A
公开(公告)日：1978-06-20
申请号：US755011
申请日：1976-12-28
申请人： Kay G. Sears
发明人： Kay G. Sears
IPC分类号： H02H3/087 , H02H7/125 , H02H3/08
CPC分类号： H02H7/1257 , H02H3/087
摘要： A protective relay circuit operating in conjunction with a regulated direct-current power supply in which a rectified A-C voltage having a ripple component is fed to an output terminal coupled to a load through the choke of a filter network. The excitation coil of a relay is connected between the input of the choke and the output terminal whereas the normally-closed relay switching contacts are interposed between the output of the choke and the output terminal. The relay coil has a high impedance relative to that of the chokes so that in normal operation, the coil has virtually no influence on the filter and does not pass the ripple component to the output terminal. In the event of a short effectively grounding the output terminal, the unfiltered rectified voltage is then imposed across the excitation coil to activate the relay and open the switching contacts, thereby disconnecting the supply from the shorting load. When the short is lifted and the current then produced by the load is insufficient to sustain the relay, the relay is automatically de-activated to restore the supply voltage.
摘要翻译：保护继电器电路与调节的直流电源一起工作，其中具有纹波分量的整流A-C电压被馈送到通过滤波器网络的扼流圈耦合到负载的输出端子。继电器的励磁线圈连接在扼流圈的输入端和输出端子之间，而常闭继电器开关触点插在扼流圈的输出端与输出端子之间。继电器线圈相对于扼流圈具有高阻抗，因此在正常工作中，线圈实际上对滤波器没有影响，并且不会将纹波分量通过输出端子。在短路有效接地输出端子的情况下，将过滤后的整流电压施加在励磁线圈上，以激活继电器并打开开关触点，从而将电源与短路负载断开。当短路提升时，由负载产生的电流不足以维持继电器时，继电器自动停用以恢复供电电压。

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