Capacitive touch panel detection circuit and boost circuit thereof
US8493131B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2011 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Mar 19, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.