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:
Jul. 23, 2013
Filed:
Feb. 28, 2011
Lianghua MO, Shenzhen, CN;
Wenping Liu, Shenzhen, CN;
Lianghua Mo, Shenzhen, CN;
Wenping Liu, Shenzhen, CN;
Focaltech Systems Ltd., Grand Cayman, KY;
Abstract
The invention discloses a capacitive touch panel detection circuit and a boost circuit thereof, wherein the boost circuit comprises a plurality of charge pumps in series, a sequence circuit and a voltage-stabilizing circuit. The charge pump comprises a first switch, a second switch, a third switch, a fourth switch, a first capacitor and a second capacitor. The switches are controlled by the sequence circuit. During the first half of the working cycle of the charge pump, the first capacitor is charged. During the second half of the working cycle of the charge pump, the second capacitor is charged so that the voltage is two times of the power voltage, after the first capacitor is connected with the power supply in sequence. The boost circuit of the invention does not need an induction and a Schottky diode. All of the capacitors except a voltage-stabilizing capacitor can be integrated into a chip. Therefore, the number of off-chip ancillary components can be reduced. Furthermore, the problem of electromagnetic interference in an inductive boost circuit can be solved.