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2. 发明授权

US4996525A R. F. lockout circuit for electronic locking system 失效
标题翻译：电子锁定系统的锁定电路
公开(公告)号：US4996525A
公开(公告)日：1991-02-26
申请号：US440950
申请日：1989-11-24
申请人： Earl M. Becker, Jr. , Allen Miller
发明人： Earl M. Becker, Jr. , Allen Miller
IPC分类号： G07C9/00 , H04B1/16
CPC分类号： G07C9/00182 , H04B1/16 , G07C2009/00793 , G07C2209/63
摘要： An electronics lockout circuit including an antenna adapted to receive ra frequency signals from a transmitter, and a radio frequency detector circuit which converts the radio frequency signals into a first direct current voltage indicative of the relative strength of the field resulting from the radio frequency signals. The first direct current voltage is supplied to a trigger circuit which compares this direct current voltage to an adjustable direct current reference voltage and provides a second direct current voltage at the output thereof whenever the amplitude of the first direct current voltage exceeds the amplitude of the reference voltage. The second direct current voltage provided by the comparator circuit is supplied to a disconnect relay circuit which upon receiving a signal from the electronic control unit of an electronic combination lock during the time period the second direct current voltage is present isolates the door strike coil of a security door from the electronic control unit. This prevents signals falsely generated by the electronic control unit because of radio frequency signals in the vicinity of the electronic control unit from energizing the door strike coil and thereby accidentally opening a security door.
摘要翻译：一种包括适于从发射机接收射频信号的天线的电子锁定电路，以及射频检测器电路，其将射频信号转换为指示由射频信号产生的场的相对强度的第一直流电压。第一直流电压被提供给触发电路，该触发电路将该直流电压与可调节的直流参考电压进行比较，并且每当第一直流电压的幅度超过参考值的幅度时，在其输出端提供第二直流电压电压。由比较器电路提供的第二直流电压被提供给断开继电器电路，其在第二直流电压存在的时间段期间从电子控制单元接收到电子组合锁定的信号将门触击线圈隔离安全门从电子控制单元。这防止了电子控制单元附近的射频信号由电子控制单元错误地产生的信号，从而对门槛线圈通电，从而意外地打开安全门。

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