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1. 发明授权

US11329481B2 Current limiting circuit arrangement 有权
公开(公告)号：US11329481B2
公开(公告)日：2022-05-10
申请号：US16876692
申请日：2020-05-18
申请人： Littelfuse, Inc.
发明人： Kristophor Ray Jensen
IPC分类号： H02H9/02 , H02H1/00
摘要： A floating two-terminal unipolar current limiting circuit arrangement implemented with enhancement mode devices and bipolar devices with a unique voltage-current operation curve. This operation curve makes this device particularly advantageous to instrumentation systems that are intended to experience large voltage transients and long-term exposure to voltages that would normally damage measurement equipment. The present current limiting device is designed to have a large impedance value prior to a “turn-on” voltage, then quickly transitions to a low-impedance state. When the conducted current exceeds a setpoint or a high-voltage event occurs, the current limiting device further transitions to the “cutoff” region, which transition resumes the initial high-impedance state. In one embodiment the threshold current may be set with internal components, while a further embodiment allows the current setpoint to be set by external components. The current limiting device designs according to the present embodiments allow for series scaling and parallel scaling.

2. 发明申请

US20210359510A1 CURRENT LIMITING CIRCUIT ARRANGEMENT 有权
公开(公告)号：US20210359510A1
公开(公告)日：2021-11-18
申请号：US16876692
申请日：2020-05-18
申请人： Littelfuse, Inc.
发明人： Kristophor Ray Jensen
IPC分类号： H02H9/02 , H02H1/00
摘要： A floating two-terminal unipolar current limiting circuit arrangement implemented with enhancement mode devices and bipolar devices with a unique voltage-current operation curve. This operation curve makes this device particularly advantageous to instrumentation systems that are intended to experience large voltage transients and long-term exposure to voltages that would normally damage measurement equipment. The present current limiting device is designed to have a large impedance value prior to a “turn-on” voltage, then quickly transitions to a low-impedance state. When the conducted current exceeds a setpoint or a high-voltage event occurs, the current limiting device further transitions to the “cutoff” region, which transition resumes the initial high-impedance state. In one embodiment the threshold current may be set with internal components, while a further embodiment allows the current setpoint to be set by external components. The current limiting device designs according to the present embodiments allow for series scaling and parallel scaling.

3. 发明授权

US11368014B2 Ground fault protection circuit and techniques 有权
公开(公告)号：US11368014B2
公开(公告)日：2022-06-21
申请号：US16876705
申请日：2020-05-18
申请人： Littelfuse, Inc.
发明人： Kristophor Ray Jensen
IPC分类号： H02H5/10 , H02H3/16 , H02H3/05 , H02H3/02 , G01R31/52
摘要： A fault protection arrangement. The fault protection arrangement may include a neutral grounding resistor including a first non-ground end, connected to a neutralizing point, and a second non-ground end. The fault protection arrangement may include a neutral grounding resistance monitor assembly, directly coupled to the second non-ground end of the neutral grounding resistor. The neutral grounding resistance monitor assembly may include comprising a signal source coupled to the neutralizing-point; a first current sense circuit coupled between the signal source and the neutralizing-point; a first voltage sense circuit coupled between the signal source and the neutralizing-point; a second current sense circuit, comprising a current sensor, coupled between the second non-ground end of the neutral grounding resistor and a protective earth connection.

4. 发明申请

US20210359507A1 GROUND FAULT PROTECTION CIRCUIT AND TECHNIQUES 有权
公开(公告)号：US20210359507A1
公开(公告)日：2021-11-18
申请号：US16876705
申请日：2020-05-18
申请人： Littelfuse, Inc.
发明人： Kristophor Ray Jensen
IPC分类号： H02H5/10 , H02H3/16 , G01R31/52 , H02H3/02
摘要： A fault protection arrangement. The fault protection arrangement may include a neutral grounding resistor including a first non-ground end, connected to a neutralizing point, and a second non-ground end. The fault protection arrangement may include a neutral grounding resistance monitor assembly, directly coupled to the second non-ground end of the neutral grounding resistor. The neutral grounding resistance monitor assembly may include comprising a signal source coupled to the neutralizing-point; a first current sense circuit coupled between the signal source and the neutralizing-point; a first voltage sense circuit coupled between the signal source and the neutralizing-point; a second current sense circuit, comprising a current sensor, coupled between the second non-ground end of the neutral grounding resistor and a protective earth connection.

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