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:
Mar. 03, 2015
Filed:
Dec. 04, 2013
Iwatt Integrated Circuits Technology (Tianjin) Limited, Tianjin, CN;
Xiaogang Zhao, Tianjin, CN;
iWatt Integrated Circuits Technology (Tianjin) Limited, Tianjin, CN;
Abstract
The present invention relates to a square wave generator circuit, an integrated circuit, a DC/DC converter and an AC/DC converter. The square wave generator circuit comprises a first mirror current branch which is connected with ground via a first switching element and a first capacitor in parallel with the first switching element, wherein the first switching element is operable to be opened or closed periodically under control of a first clock signal so as to generate a first sawtooth wave signal at a non-grounded terminal of the first capacitor; a second mirror current branch which is connected with ground via a second switching element and a second capacitor in parallel with the second switching element, wherein the second switching element is operable to be opened or closed periodically under control of a second clock signal synchronous with the first clock signal so as to generate a second sawtooth wave signal at a non-grounded terminal of the second capacitor; and a comparator, one input terminal of which is connected to the non-grounded terminal of the first capacitor and the other input terminal of which is connected to the non-grounded terminal of the second capacitor, so that a square wave signal can be outputted at an output terminal of the comparator, wherein a duty cycle of the square wave signal depends on a ratio of a capacitance of the second capacitor to a capacitance of the first capacitor.