Electromagnetically coupled battery charger
Patent 4031449 Issued on June 21, 1977. Estimated Expiration Date: 
June 21, 1994. 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.
June 21, 1994. 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 2502398 3188562 3280363 3641336 3736480 3885211 InventorApplicationNo. 05/633987 filed on 11/20/1975US Classes:320/108, Charger inductively coupled to cell or battery320/139, Pulsed320/162, With detection of current or voltage amplitude336/211CONCENTRIC OR NESTED CORE ELEMENTSExaminersPrimary: Hickey, Robert J.Attorney, Agent or FirmInternational ClassH02J 7/02 (20060101)AbstractA solid state electronic battery charger which is electromagnetically coupled to one or more batteries. A charging circuit energizes a drive winding to produce an alternating field received by an associated coupler and operative to convey charging current to a battery connected thereto. A sense winding monitors the level of the alternating field to derive a signal representative of the battery charge level and which causes a tapered charge to be supplied to the battery and an indication of a sensed fully charged state. A proximity sensor can be provided to denote the presence of a coupled battery and by which charging operation is commenced. | |
