Power supply device for communication apparatus
US5834857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1995 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Apr 14, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/00904
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention provides a facsimile apparatus which can reduce the consumption power of main power supply control means, and can suppress the charging frequency of a secondary battery without widening the operating voltage range of the main power supply control means. The facsimile apparatus has a main power supply control unit. The main power supply control unit has a DC--DC converter which receives a power from a secondary battery, a solar battery, or a main power supply, and operates to maintain a constant output voltage, and a microcomputer driven by the output voltage from the DC--DC converter. The output voltage from the DC--DC converter is detected by a voltage detect circuit, and a voltage from the secondary battery is detected by another voltage detect circuit. The microcomputer performs control for supplying a power from the secondary battery or the solar battery to the DC--DC converter, control for charging the secondary battery by the main power supply or the solar battery, and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.