Variable charge pump circuit with dynamic load
US6724241B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2003 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Jan 27, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable charge pump circuit uses a plurality of selectable loads to minimize the voltage ripples of the pumped output by selecting the appropriate load for a preselected pump voltage. The charge pump circuit also compares the pump voltage to a reference voltage to shut down the variable charge pump circuit if the pump voltage is larger than the reference voltage. The charge pump circuit also compares the maximum voltage output to the reference voltage to monitor whether the maximum ripple on voltage output is larger than the reference voltage. The charge pump circuit comprises one or more stages operable to receive a supply voltage and generate one or more pump voltages, a plurality of loads each associated with a specific pump voltage, and a load selector means coupled to the output pump and the plurality of loads for selecting a load associated with a specific pump voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.