The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2014
Filed:
Aug. 24, 2011
Wolfgang Hofheinz, Gruenberg, DE;
Wolfgang Hofheinz, Gruenberg, DE;
Bender GmbH & Co. KG, Gruenberg, DE;
Abstract
The invention relates to an insulation monitoring device (IMD) in a non-grounded electrical DC grid (DC-IT System), particularly an electrical photovoltaic system (PV). Said device has a power supply unit (B), which is supplied with electrical energy from the electrical DC grid (DC-IT System). According to the invention a rechargeable energy store (C) is present, in particular a capacitor with a charging diode (D) connected upstream. This is supplied with electrical energy (U) via the electrical DC grid and supplies the power supply unit (B) in the event of a temporary failure of the electrical DC grid, so that continued operation of the insulation monitoring device (IMD) is possible until the non-grounded electrical DC grid is re-established. Advantageously, for continued operation of the insulation monitoring in the event of failure of the electrical DC grid the power supply unit (B) provides a preferably pulsed measurement voltage (U), which is used in order to feed electrical energy into the electrical DC grid (DC-IT) via a coupling circuit (AS).