Switching regulator capable of efficient control at control mode change
US7576530B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 2007 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Feb 6, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching regulator includes a switching transistor to switch, an inductor to store charge from an input voltage, a comparator to compare a voltage at a connecting node of the switching transistor and the inductor with a predetermined voltage and generate a binary signal, a detector to detect a voltage difference between an output voltage and a predetermined reference voltage, a pulse generator to generate a pulse signal having a predetermined pulse width to switch the switching transistor on/off in VFM control mode, and a controller to determine the output voltage and select VFM or PWM control mode to make the output voltage a predetermined constant voltage. The controller changes the control mode from the VFM to the PWM control mode when the controller determines that the output voltage does not change while the pulse generator is outputting the pulse signal in the VFM control mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.