Battery charger for a backup power circuit
Patent
·
OSTI ID:6137244
A battery pack-containing solid state circuit, normally in a standby condition, automatically applies battery-generated power to a multi-power requirement load a predetermined time period subsequent to detection of a malfunction in the load's normal power source. In switching to its power-applying state, the circuit disconnects the load from its malfunctioning power source and energizes the load at a level consistent with the battery pack capabilities. The circuit includes a unique fold-backcharacterized, overcurrent-protected inverter and a temperaturecompensated battery charger. A low battery voltage sensor exhibiting hysteresis characteristics inhibits operation of the circuit when the battery voltage drops below a predetermined level indicative of a discharge condition, the low voltage sensor continuing to inhibit operation of the circuit until a battery voltage charging input regains a level in excess of the predetermined level at which the discharge battery initially inhibited circuit operation. Restoration of normal power resets the circuit to a standby condition after a predetermined time period. The circuit finds particular application as an emergency power unit to effect lowering of an hydraulic elevator car and release of passengers therefrom.
- Assignee:
- EDB-83-140154
- Patent Number(s):
- US 4382221
- OSTI ID:
- 6137244
- Country of Publication:
- United States
- Language:
- English
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