Invention Grant
- Patent Title: Circuit arrangement for combined protection of a load from temporary and transient overvoltages
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Application No.: US16761389Application Date: 2018-10-17
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Publication No.: US11431164B2Publication Date: 2022-08-30
- Inventor: Franz Schork , Ralph Brocke
- Applicant: DEHN SE + CO KG
- Applicant Address: DE Neumarkt/Opf.
- Assignee: DEHN SE + CO KG
- Current Assignee: DEHN SE + CO KG
- Current Assignee Address: DE Neumarkt/Opf.
- Agency: Bodner & O'Rourke, LLP
- Agent Gerald T. Bodner; Christian P. Bodner
- Priority: DE102017125894.9 20171106,DE102018103012.6 20180209
- International Application: PCT/EP2018/078416 WO 20181017
- International Announcement: WO2019/086249 WO 20190509
- Main IPC: H02H9/04
- IPC: H02H9/04 ; G01R19/145 ; G01R19/175 ; H01C7/10 ; H01F19/08 ; H02H3/02 ; H02H3/08 ; H02H3/20 ; H03K17/08

Abstract:
The invention relates to a circuit arrangement for combined protection of a load from temporary and transient overvoltages with emergency operation of the load in the presence of a temporary overvoltage and with integrated follow current limitation, wherein a first surge arrester, in particular a spark gap or a varistor, is provided between network-side input terminals and a second surge arrester, in particular a varistor, is provided between load-side output terminals for follow current limitation. According to the invention, at least one controlled semiconductor switch is provided in each case in the series branch between the input terminal and the output terminal and in the output-side parallel branch, wherein a mechanical switch and a series capacitance are connected in parallel with the semiconductor switch in the series branch. Furthermore, the semiconductor switch in the parallel branch is part of a series circuit comprising a parallel circuit comprising a second surge arrester and a parallel capacitance. A series inductance is provided in the series branch between the input terminal and the parallel circuit comprising the series capacitance, the controlled semiconductor switch and the mechanical switch. A microcontroller for controlling the semiconductor switches is also present, wherein the microcontroller is connected to a current detector in the series branch.
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