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:
Feb. 12, 1991
Filed:
Aug. 01, 1989
Karlheinz Hammelsbacher, Schwabach, DE;
Diehl GmbH & Co., Nuremberg, DE;
Abstract
A digitally-operating electrical appliance or equipment which is adapted to automatically handle power-supply or line frequencies of 50 Hz or 60 Hz. A full wave of the power-supply frequency is utilized for the generating of a waveform having a pulse referenced thereto. A pulse sequence which is generated independently of the power-supply frequency and is of an essentially higher frequency than the former is counted into a counter, and the content of the counter is thereafter discriminated at a threshold value of about 55 Hz. Depending upon the obtained result, a first signal is generated which is associated with the frequency of 50 Hz, or a second signal is generated which is associated with the frequency of 60 Hz, wherein the signals correspondingly switch a frequency divider to either a dividing ratio of 50:1 or 60:1 such that at the output of the frequency divider, independently of the power-supply frequency, there are generated pulses of a constant frequency for the synchronized power supply of the appliance.