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:
Jan. 29, 1991
Filed:
Aug. 12, 1988
Manfred Gruner, Ulm, DE;
Franz Riedl, Gunzburg, DE;
Mannesmann Aktiengesellschaft, Du, DE;
Abstract
A chopper circuit is provided for driving of electromagnets and/or step motor coils (8;26) in particular for a matrix printer, where the inductivity of the coil generates in connection with the applied voltage a maximum current, which current, however, is set lower by desired factor, whereby the current ripples (7a) are generated by chopping. These current ripples (7a) can be changed, that is, set to an optimum value depending on frequency inductivity and resistance of an electromagnetic coil (8) or, respectively, of a magnet coil winding (26). A driver circuit (9) for the electromagnetic coil (8) or, respectively, bridge circuit (27) for the step motor coil (26) have coordinated current data acquistion (10) with a current shut-off (11) in each case and that a digital control logic (12) is provided, which control logic generates a control signal (2) in the cycle of a shunted frequency generator, where the control signal (2) is present as an input and output signal at the input (13) of the driver circuit (9) or, respectively, of the bridge circuit, alternating with the current shut-off (11).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile