Control circuit and control method for charge pump circuit
US7737767B2 · kind B2 · utility
5Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2008 |
| Grant date | Jun 15, 2010 |
| Priority date | — |
| Expiry date | Nov 13, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00045
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse frequency modulator generates a pulse signal having a fixed duty ratio and a frequency which is adjusted such that a feedback voltage corresponding to the output voltage of a charge pump circuit is coincident with a predetermined first reference voltage. A driver, on receiving the pulse signal, turns on a first or second group of switches during the time periods corresponding to the high time periods of the pulse signal and turns on the other ones of the first and second group of switches during the time periods corresponding to the low time periods of the pulse signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.