Chopper-amplifier for the voltage of a photovoltaic power source, in particular for a timepiece
February 13, 2018. 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 ReferencesRegulating digital power supply Device for charging an accumulator from an electrical energy source more particularly for an electronic watch Maximum power tracker Power supply for electronic timpiece Apparatus and method for maximizing power delivered by a photovoltaic array Self-excited power minimizer/maximizer for switching power converters and switching motor drive applications Electronic timepiece and method of charging the same Patent #: 5822278 InventorsAssigneeApplicationNo. 023124 filed on 02/13/1998US Classes:323/222, Using choke and switch across source323/285With plural condition sensingExaminersPrimary: Tso, Edward H.Assistant: Patel, Rajnikant B. Attorney, Agent or FirmForeign Patent References
International ClassesG05F 001/10G05F 001/40 Foreign Application Priority Data1997-02-17 EPAbstractIn this booster, the voltage across the terminals of the photovoltaic power source (1) is regulated as a function of a reference voltage (Vref) which is chosen to be substantially equal to the voltage corresponding to the maximum value of the voltage-power curve of this source. The reference voltage generated in the reference generator (9) is compared to the voltage (Vsc) of the source (1), the result is sampled and influences the duty cycle of a control signal (Fc) applied to the switching transistor (7). The latter is responsible for chopping the current flowing from the source to the load (accumulator 6) through an inductor coil (4) and a diode (5).Other References
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