Switching frequency control of switched capacitor circuit using output voltage droop
US7612603B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2007 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Jun 14, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/4837
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A frequency control circuit including a controlled oscillator and an amplifier circuit is disclosed for providing a clock signal to a switched capacitor circuit which divides an input voltage to provide an output voltage. The controlled oscillator has a frequency control input receiving a frequency control signal and an output for providing the clock signal at a frequency based on the frequency control signal. The amplifier circuit has an input for receiving the output voltage and an output providing the frequency control signal based on droop of the output voltage. In one embodiment, the amplifier circuit adjusts the frequency control signal to optimize efficiency of the switched capacitor circuit over a voltage range of the output voltage, which changes based on load level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.