Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1985-03-28
1986-06-17
Hickey, R. J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
307 66, 320 48, H02J 700, H02J 900
Patent
active
045958726
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 one second whenever the output power switch is closed. If the battery is adequately charged, the power supply remains awake; if not, it reverts to sleep. When connected to an adequate DC source, the unit functions as an on-line uninterruptible power supply; when disconnected, the computer becomes a battery-powered portable.
REFERENCES:
patent: 4237385 (1980-12-01), Jurgens et al.
patent: 4315162 (1982-02-01), Ferguson
patent: 4354118 (1982-10-01), Spencer
patent: 4400661 (1983-08-01), Duley
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