Charge pump DC/DC converters with reduced input noise
US6411531B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2000 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Nov 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/073
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charge pump DC/DC converter with reduced noise at the input voltage source is provided. The present invention includes buck and boost DC/DC converters with added circuitry coupled between the input voltage and the switches which maintains a substantially constant input current on both phases of the charge pump clock. The added circuitry reduces input current variations to provide reduced noise at the input voltage source. Feedback loop circuitry coupled between the output node and the added circuitry varies the current through the switches to control the output current of the DC/DC converter in order to maintain the output voltage at the regulated value. The added circuitry may comprise a variable resistor, current mirror, or current mirrors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.