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1. 发明授权

US5896263A Output circuit having electronic overload protection activated by voltage drop across output transistor 失效
标题翻译：具有通过输出晶体管两端的压降激活的电子过载保护的输出电路
公开(公告)号：US5896263A
公开(公告)日：1999-04-20
申请号：US884305
申请日：1997-06-27
申请人： Dale R. Terdan , John R. O'Connell
发明人： Dale R. Terdan , John R. O'Connell
IPC分类号： H03K17/082 , H02H3/00
CPC分类号： H03K17/0822
摘要： An output circuit has multi-stage protection circuitry for protecting against different fault current conditions. The protection circuitry operates by detecting voltage changes across the output transistor of the output circuit. The output circuit comprises first, second and third switching devices. The first switching device is connected to the output device and power conditions the output signal. The second and third switching devices override the output signal and turn off the first switching device when a magnitude of current through the first switching device exceeds predetermined magnitudes for predetermined amounts of time. A protection circuit is also disclosed which has a sensing device that senses a current flow condition by sensing a voltage drop produced across two terminals of the first power conditioning transistor, the two terminals being the terminals through which the current flows. Advantageously, the output circuit utilizes highly flexible two-stage protection circuitry. The protection circuitry separately identifies surge current and overcurrent conditions. In addition to the flexibility provided by the use of two-stage protection circuitry, flexibility is also provided by the fact that component values may be easily varied to vary the magnitudes/durations of current within each stage which activate the protection circuitry. Moreover, the protection circuitry has a very fast response time. As a result, an output transistor which is protected by the protection circuitry of the present invention suffers much less stress in the event of a short circuit condition.
摘要翻译：输出电路具有多级保护电路，用于防止不同的故障电流状况。保护电路通过检测输出电路的输出晶体管上的电压变化而工作。输出电路包括第一，第二和第三开关器件。第一个开关装置连接到输出装置，并对输出信号进行功率调节。当经过第一开关器件的电流的大小超过预定量值预定的时间量时，第二和第三开关器件覆盖输出信号并关断第一开关器件。还公开了一种保护电路，其具有感测装置，其通过感测在第一功率调节晶体管的两个端子上产生的电压降来感测电流流动状态，两个端子是电流流过的端子。有利地，输出电路使用高度柔性的两级保护电路。保护电路分别标识浪涌电流和过流条件。除了通过使用两级保护电路提供的灵活性之外，还可以通过以下事实来提供灵活性：组件值可以容易地改变以改变激活保护电路的每个级内的电流的大小/持续时间。此外，保护电路具有非常快的响应时间。结果，由本发明的保护电路保护的输出晶体管在短路状态下受到的应力要小得多。

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