Patents by Inventor Ernst Kulzer

Ernst Kulzer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Circuit arrangement for charging rectifiers for DC energy storage devices in telecommunications systems, particularly telephone switching systems
    Patent number: 5051730
    Abstract: Monitoring equipment is provided in a charging rectifier for operational monitoring of a converter supplied by the AC voltage supply network and is provided with DC voltage feed via two rectifiers serving the purpose of decoupling, in particular, via one of the two rectifiers from an auxiliary converter likewise supplied from the AC voltage supply network, on the one hand, and via another of the two rectifiers from a DC converter supplied by the DC energy storage device, on the other hand. The DC voltage offered by the DC converter is higher than the DC voltage offered by the auxiliary converter. The monitoring equipment distinguishes between these DC voltages with reference to magnitude and, when receiving a lower DC voltage, checks for the presence of the DC voltage supplied to the DC converter by the DC energy storage device.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: September 24, 1991
    Assignee: Siemens Aktiengesellschaft
    Inventor: Ernst Kulzer