Charge/discharge control circuit and chargeable electric power source apparatus
Patent 5742148 Issued on April 21, 1998. Estimated Expiration Date: 
April 21, 2015. 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.
April 21, 2015. 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 3543043 Low impedance regulator for a battery with reverse overcharge protection Patent #: 5142215 InventorsAssigneeApplicationNo. 154463 filed on 11/17/1993US Classes:320/134, With battery or cell condition monitoring (e.g., for protection from overcharging, heating, etc.)320/118, With discharge of cells or batteries320/128, With charging320/136, With battery or cell condition monitoring (e.g., for protection from overcharging, heating, etc.)320/155Time controlExaminersPrimary: Tso, Edward H.Attorney, Agent or FirmForeign Patent References
International ClassH01M 010/46Foreign Application Priority Data1992-11-24 JPAbstractA chargeable power supply which has a charge/discharge control circuit is provided in which the service life of a secondary cell is prolonged. A voltage dividing circuit, an overcharge voltage detection circuit, an overdischarge detection circuit and a control circuit are connected in parallel to the secondary cell. The control circuit receives signals indicating the condition of the secondary cell from the overcharge/overdischarge voltage detection circuits and outputs a signal for controlling a switch circuit for disconnecting the secondary cell from external equipment, or to stop a charging operation by an external power source. The control circuit also controls a switching element provided in series with the voltage dividing circuit and reduces a current which flows through the dividing circuit. A current limiting means is provided to limit the current consumption of the charge/discharge control circuit. In one embodiment, a the current limiting device is a switching element provided in series with the voltage dividing circuit. In another embodiment, the current limiting device is an error amplifier with a latching function provided in an overcharge detecting circuit.Other References
| |
