Battery charging circuit for an emergency system
Patent 4223232 Issued on September 16, 1980. Estimated Expiration Date: 
May 31, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 31, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3189788 3255398 3278823 3596106 3746877 3808499 Battery charging and discharging system Emergency lamp and solid state switching circuit therefor Battery charging circuit Patent #: 3979656 InventorAssigneeApplicationNo. 05/911233 filed on 05/31/1978US Classes:307/66, Storage battery or accumulator315/86, AUTOMATIC SUBSTITUTION OF THE POWER SUPPLY320/128, With charging340/333, With specific power supply (e.g., power substitution)362/20AUTOMATIC SUBSTITUTION OF POWER SUPPLY OR LIGHT SOURCEExaminersPrimary: Hix, L. T.Assistant: Schreyer, S. D. Attorney, Agent or FirmInternational ClassesH02J 9/00 (20060101)H02H 3/24 (20060101) H02J 9/02 (20060101) AbstractA single active element performs the multiple functions of regulating DC voltage level from an AC source supplied to charge a battery and of coupling the battery to power an emergency system such as an emergency lighting system upon loss of the AC source. Preferably, the single active element also performs a third function of disconnecting the battery from the emergency system in time to prevent over discharge and consequent permanent damage to the battery. | |
