Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1979-12-14
1982-02-16
Franklin, Lawrence R.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
187 29R, B66B 502
Patent
active
043160972
ABSTRACT:
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 foldback-characterized, overcurrent-protected inverter and a temperature-compensated 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 discharged 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.
REFERENCES:
patent: 2606217 (1952-08-01), Raine et al.
patent: 3348118 (1967-10-01), Watrous
patent: 3469657 (1969-09-01), Sgroi
patent: 3532186 (1970-10-01), Swartzell
patent: 3706357 (1972-12-01), Simpson
patent: 3902573 (1975-09-01), Grove et al.
Dwyer James L.
Franklin Lawrence R.
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