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1. 发明申请

US20150171627A1 HOT SWITCH PROTECTION CIRCUIT 有权
标题翻译：热开关保护电路
公开(公告)号：US20150171627A1
公开(公告)日：2015-06-18
申请号：US14258916
申请日：2014-04-22
申请人： Keithley Instruments, Inc.
发明人： Matthew A. Holtz , Gregory Sobolewski , Jerold A. Williamson
IPC分类号： H02H9/04
CPC分类号： H02H9/041 , H01H9/542
摘要： A switch protection circuit includes a discharging circuit and, optionally, a clamping circuit. The discharge circuit operates prior to the switch completing the switching action to discharge capacitance from a signal line of a cable connected to a device under test to a ground voltage. When not discharging, the discharge circuit presents low leakage to a measurement circuit so as not to interfere with such measurement. If present, the clamping circuit clamps a signal line of the cable to a guard structure of the cable so that the discharge circuit can couple both the signal line and the guard structure to ground. The protection circuit operates without significantly worsening low current performance of the measurement instrument.
摘要翻译：开关保护电路包括放电电路和可选的钳位电路。放电电路在开关完成切换动作之前操作，以将电容从连接到被测器件的电缆的信号线放电至接地电压。放电电路不放电时，对测量电路的泄漏量低，不会影响测量。如果存在，钳位电路将电缆的信号线夹紧到电缆的保护结构，使得放电电路可以将信号线和保护结构耦合到地。保护电路在测量仪器的低电流性能没有显着恶化的情况下运行。

2. 发明授权

US09680300B2 Hot switch protection circuit 有权
公开(公告)号：US09680300B2
公开(公告)日：2017-06-13
申请号：US14258916
申请日：2014-04-22
申请人： Keithley Instruments, Inc.
发明人： Matthew A. Holtz , Gregory Sobolewski , Jerold A. Williamson
IPC分类号： H02H9/04 , H01H9/54
CPC分类号： H02H9/041 , H01H9/542
摘要： A switch protection circuit includes a discharging circuit and, optionally, a clamping circuit. The discharge circuit operates prior to the switch completing the switching action to discharge capacitance from a signal line of a cable connected to a device under test to a ground voltage. When not discharging, the discharge circuit presents low leakage to a measurement circuit so as not to interfere with such measurement. If present, the clamping circuit clamps a signal line of the cable to a guard structure of the cable so that the discharge circuit can couple both the signal line and the guard structure to ground. The protection circuit operates without significantly worsening low current performance of the measurement instrument.

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