Current sensing circuitry for DC-DC converters
US7151361B2 · kind B2 · utility
11Cited by
7References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 2004 |
| Grant date | Dec 19, 2006 |
| Priority date | — |
| Expiry date | Feb 5, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An inductor based DC-DC converter of the present invention employs two power switches such that only a fraction of inductor current flows through sensing circuitry. The sensing circuitry itself is comprised of sense transistors instead of resistors in order to further reduce power dissipation and temperature variations. The sensing circuitry includes a differential power supply that modifies a sense current employed as feedback to one of its inputs. The sense transistors are selected and configured such that the sense current is a relatively constant fraction of the inductor current of the converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.