Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1981-06-12
1983-05-03
Shoop, William M.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
H02J 704
Patent
active
043822215
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 fold-back-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 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.
REFERENCES:
patent: 3736489 (1973-05-01), Mullersman
patent: 4065712 (1977-12-01), Godard et al.
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