Computer-attached uninterruptable DC power supply
US4595872A · kind A · utility
Inventor
Key dates
| Filing date | Mar 28, 1985 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Mar 28, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S320/21
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A DC power supply comprising a sealed lead-acid battery, a charging regulator, a discharge pass element, an output power switch for disconnected the power supply from the computer and four light-emitting diode indicators which display the condition and trend of the battery charge state. The power supply may be permanently attached to an Apple IIc brand computer without marring the computer's plastic housing by means of tabs on upper and lower projections of the power supply housing which interlock with slots on the upper and lower surfaces of the computer's housing. The power supply also features an electronic "sleep" switch which not only prevents battery drain when the power output switch is turned off, but also prevents deep discharge of the battery and possible damage to the powered equipment when battery voltage drops below a preset value while the output switch is turned on and adequate voltage from the power line is unavailable. The sleep switch disables all of the power supply's circuitry save an input-deactivated driver transistor and a CMOS logic circuit required for both disabling and reawakening the circuitry. A one-shot awakening feature is triggered for approximately …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.