Control of operation of switching regulator to select PWM control or PFM control based on phase comparison
US7804285B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 2007 |
| Grant date | Sep 28, 2010 |
| Priority date | — |
| Expiry date | Jan 22, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching regulator is disclosed that includes a switching transistor; an inductor; a voltage comparator circuit part comparing a voltage at the connection of the switching transistor and the inductor and a predetermined voltage and outputting a first signal; a phase comparator circuit part comparing the phases of a control signal input to the switching transistor and the output first signal and outputting a second signal; and a control circuit part performing PWM control or PFM/VFM control on the switching transistor in accordance with the output second signal so that a predetermined constant voltage is output from the switching regulator. The control circuit part performs PWM control if the output second signal indicates that the control signal and the output first signal are in phase, and performs PFM/VFM control if the output second signal indicates that the control signal and the output first signal are out of phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.