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:
Apr. 25, 2017
Filed:
Feb. 05, 2015
The Hong Kong University of Science and Technology, Hong Kong, CN;
The Hong Kong University of Science and Technology, Hong Kong, CN;
Abstract
A charge pump (CP) that operates at low input voltage with high power conversion efficiency is disclosed. A first embodiment provides a negative CP used for controlling load switches of a voltage doubler. Using a negative CP extends the operating region below ground to relieve the power delivery limitation of the CP. A second embodiment provides a low power adaptive dead-time circuit, which has several dead-time signals having different lengths of dead-times and selects one according to the input voltage level. A low input voltage detector in the adaptive dead-time circuit is used to determine which dead-time should be used. A third embodiment provides a switching body bias used for the low input voltage CP. The switching body bias uses both forward and reverse body bias applied to the CP to minimize reverse current and maximize power transfer. The first, second, and third embodiments can be used together or independently.