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:
Oct. 15, 2019
Filed:
Aug. 14, 2018
Littelfuse, Inc., Chicago, IL (US);
Anatoliy V. Tsyrganovich, Woodside, CA (US);
LITTELFUSE, INC., Chicago, IL (US);
Abstract
A sense resistor is placed in series with an output capacitor of a buck converter. The buck converter operates in a discontinuous mode such that there is a dead time in each switching cycle. A control circuit senses a voltage across the sense resistor and thereby generates a first signal I. The control circuit detects an offset voltage in I, where the offset voltage is the voltage of Iduring the dead time in a first switching cycle. The control circuit level shifts the entire Iby the offset voltage, thereby generating a second signal I. Ihas the same waveform as the waveform of the inductor current. In a second cycle, Iis used to determine when to turn off the main switch and when the start of the dead time occurs. Iand the offset voltage are used together to determine when to turn the main switch on.