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:
May. 21, 2013
Filed:
May. 17, 2011
Claude Froidevaux, La Chaux-de-Fonds, CH;
Jean-marc Vaucher, Couvet, CH;
Claude Froidevaux, La Chaux-de-Fonds, CH;
Jean-Marc Vaucher, Couvet, CH;
ETEL S.A., Motiers, SE;
Abstract
An electronic circuit includes a linear amplifier unit having a first current feedback loop, assisted by a switched-mode amplification unit having a second current feedback loop. The inputs of the two units are connected so that they receive, at the same time, a current setpoint in an operating mode in order to generate a fixed current across a load connected to the output of the units. The first feedback loop includes a first sensor to measure the current in the load, a first subtractor element to subtract the first measured current from the current setpoint, a first controller connected to the output of the first subtractor element and controlling a linear amplifier, which supplies the first output current to the load. The second feedback loop includes a second current sensor to measure a second current supplied to the load, between a connecting node of two switches connected in series to a supply voltage source and an inductor whose output is connected to the load. The second loop further includes a second subtractor element to subtract the second measured current from the current setpoint, a second controller connected to the output of the second subtractor element and controlling a pulse-width modulator that controls the activation of the switches to alternately connect the inductor either to the high potential or to the low potential of the supply voltage source.