Power supplies for electronic device
Patent 5130960 Issued on July 14, 1992. Estimated Expiration Date: 
July 18, 2011. 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.
July 18, 2011. 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 ReferencesElectronic alarm timepiece Illuminated changeable-display sign Self-charging electronic timepiece Power supply for electronic timpiece Electronic wristwatch with generator Patent #: 5001685 InventorAssigneeApplicationNo. 732392 filed on 07/18/1991US Classes:368/204ElectricalExaminersPrimary: Miska, Vit W.Attorney, Agent or FirmForeign Patent References
International ClassesG04B 001/00G04C 003/00 Foreign Application Priority Data1990-07-18 JPAbstractAn electronic device, in a preferred embodiment an electronic watch, including a power generating device, a secondary power source for storing generated electric energy fed from the power generating device and serving as the power source for the electronic device, a first boosting circuit for stepping up the voltage of the secondary power source, a second boosting circuit, and a capacitor connected to the output of the first boosting circuit and charged through the output of the first boosting circuit, for stepping up the voltage of the capacitor. A voltage level converter converts a control signal based on the first boosting circuit output voltage to a control signal based on the second boosting circuit output to at least in part control the operation of the first boosting circuit. In this manner, the boosting circuits control the operation of the device such that when the voltage lever is low or the voltage level reaches a certain point the device does not shut down, but rather maintains normal operation. | |
