Power switching unit of a portable telephone capable of monitoring and controlling a battery supply voltage thereof
US6643527B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1997 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Nov 3, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A power switching unit of a portable telephone which has a function of storing data such as telephone numbers and operates with a battery. The unit comprises a battery for supplying power to a radio unit and a control unit which contains a data storage function and controls operation of the radio unit, first voltage monitor means for monitoring a supply voltage of the battery to output a first voltage drop signal when the supply voltage falls below a first predetermined value, and communication disconnection means for stopping power supply to the radio unit upon reception of the first voltage drop signal. The power switching unit of the portable telephone further includes voltage adjustment means for adjusting voltage suppled to the control unit from the battery to a predetermined operating voltage of the control unit for supplying it to the control unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.