Power supply voltage control apparatus
US7501868B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 2006 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Jan 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/157
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power supply voltage control apparatus capable of freely setting a clock period setting margin according to a system clock frequency, and capable of converging power supply voltage to minimum power supply voltage where normal operation is possible in a short period of time without errors in operation of internal circuits in response to changes in the system clock frequency is provided. Power supply voltage control apparatus 100 is provided with frequency-dividing circuit 121 that frequency-divides the system clock at frequency-dividing ratio 1, frequency-dividing circuit 122 that frequency-divides the output of voltage control oscillator circuit 110 at frequency-dividing ratio 2, phase comparator/frequency comparator 130 that carries out phase comparison/frequency comparison on the respective output signals of frequency-dividing circuits 121 and 122, and controller 145. Frequency-dividing ratios of frequency-dividing circuits 121 and 122 are set by control circuit 141 according to an operation mode signal corresponding to the system clock frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.