Constant voltage circuit with a substitute circuit in case of input voltage lowering
US6465996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2001 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Mar 6, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0063
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A constant voltage circuit robust to the input voltage lowering is disclosed. The invention is applied to a constant voltage circuit fed with an input voltage through first and second power conductors for transferring the input voltage to a load as an output voltage through an output transistor. An inventive constant voltage circuit is provided with a substitute circuit, responsive to a detection of the lowing of the input voltage to a predetermined voltage, for providing a substitute output path that is connected in parallel with the output transistor. Doing this minimize the degree of lowering of the second voltage due to the lowering of said first voltage. The output transistor may be nay of NPN and PNP transistors and P-type and N-type MOS FETs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.