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:
Nov. 19, 2013
Filed:
Apr. 20, 2011
Guoming Wu, Shanghai, CN;
Guoming Wu, Shanghai, CN;
Analog Devices, Inc., Norwood, MA (US);
Abstract
DC-DC voltage converter systems are provided in which a switching voltage converter is arranged with an inductor to switch first and second currents with duty cycles D and D' determined by an error voltage Vto thereby maintain an output voltage V. A transconductance amplifier having an amplifier output provides the error voltage Vin response to the output voltage and a reference voltage V. A ripple current Iis provided to the amplifier output in response to the difference between the error voltage Vand a clamp voltage V. Finally, a current comparator generates a skip signal to turn off the first and second currents in response to a selected threshold of the ripple current. In this process, the ripple current Isubstantially clamps the error voltage Vto the clamp voltage V. Preferably, the current comparator is arranged to provide the skip signal in response to the selected first threshold of the ripple current Iand retract the skip signal in response to a selected second threshold of the ripple current I.