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1. 发明授权

US4819117A Method and apparatus for detecting excessive current draw in an electrical load 失效
标题翻译：用于检测电负载中过大电流消耗的方法和装置
公开(公告)号：US4819117A
公开(公告)日：1989-04-04
申请号：US89218
申请日：1987-08-25
申请人： Daniel G. Brennan , Mark J. Gutwald , Leonard J. Miller
发明人： Daniel G. Brennan , Mark J. Gutwald , Leonard J. Miller
IPC分类号： H02H1/04 , H02H3/087 , H02H3/05
CPC分类号： H02H1/043 , H02H3/087 , Y10S323/901 , Y10S323/908
摘要： A method and apparatus are disclosed for detecting excessive current draw in an electrical load particularly of the type having an in-rush current when first energized. The electrical load is connectable to an energy source through a current sensing circuit and an actuatable switch. The current sensing circuit provides a load sense signal that varies in response to current draw by the load. A control signal is provided to actuate the switch. A coupling network temporarily couples the control signal to the load sense signal to offset the change in the load sense signal resulting from current in-rush. The load sense signal is compared against a reference signal. The comparator outputs a signal indicative of whether the load sense signal is greater or less than the reference signal. One signal from the comparator is indicative of excessive current draw. The temporary coupling of the control signal with the load sense signal prevents the comparator from indicating an excessive current draw during current in-rush as long as the current draw does not reach a very large value, such as would occur during a short circuit. The output of the comparator is ANDed with the control signal for control of the switch.
摘要翻译：公开了一种用于检测电负载中的过度电流消耗的方法和装置，特别是在第一次通电时具有浪涌电流的类型。电负载可通过电流检测电路和可启动开关连接到能量源。电流感测电路提供负载感测信号，该负载感测信号随着负载的电流消耗而变化。提供控制信号以致动开关。耦合网络将控制信号临时耦合到负载感测信号，以抵消由电流涌入引起的负载感测信号的变化。将负载感测信号与参考信号进行比较。比较器输出指示负载感测信号是否大于或小于参考信号的信号。比较器的一个信号表示过度的电流消耗。控制信号与负载检测信号的临时耦合可防止比较器在电流涌入期间指示过大的电流消耗，只要电流消耗不会达到非常大的值，例如在短路期间会发生。比较器的输出与用于控制开关的控制信号进行“与”运算。

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