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Electrical and Wave

Energy-conserving-multiple-power-source-and-method-for-battery-operated-products

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Energy-conserving multiple power source and method for battery-operated products

Details

Inventors: Bender, Edward D.; Stratton, W. David;
Assignee: Academy of Applied Science (Concord, NH)
Primary Examiner: Stephan; Steven L.
Assistant Examiner: Nappi; Robert
Attorney, Agent or Firm: Rines & Rines

An energy-conserving photvoltaic- or solar-rechargeable power source for commercial or industrial battery-operated products is provided, enabling a high degree of reliability of continued operation through a method involving the use of a backup battery or other backup d.c. voltage source which is automatically and instantaneously selected when the rechargeable cell falls below a predetermined lower threshold voltage. As the rechargeable cell receives charge from the solar cell, the circuit automatically switches back to it as the primary power source when an upper threshold voltage is reached. Moreover, the initial connecting of the rechargeable cell to power the product is ensured upon the turn-on of the product, even if not fully charged (though above the lower threshold voltage), conserving the backup source. More general applications are also disclosed.

DETAILED DESCRIPTION What is claimed is: 1.
A multiple D.
C.
power source for electrical and electronic products having, in combination, a rechargeable primary D.
C.
voltage source having chargeable means and comprising photovoltaic cell means and in which the voltage value thereof is controlled in response to charging induced by light received by the photovoltaic cell means; a backup D.
C.
voltage source; oppositely alternately operative switching means for connecting the primary D.
C.
voltage source to the product while disconnecting the backup D.
C.
voltage source from the product; and sense and control means connected to monitor the state of the said voltage value of the primary D.
C.
voltage source and for establishing predetermined upper and lower threshold voltages therefor, and for controlling the switching means in response to the monitoring, automatically and instantaneously to connect the backup D.
C.
voltage source to the product while disconnecting the primary D.
C.
voltage source therefrom when said voltage value thereof drops to said lower threshold voltage; and means for automatically and instantaneously reconnecting the primary D.
C.
voltage source to the product while disconnecting the backup D.
C.
voltage source from the product when the voltage value of the primary D.
C.
voltage source has recharged sufficiently to reach said upper threshold value, whereby in the absence of the backup D.
C.
voltage source the switching means is powered from the primary D.
C.
voltage source.
2.
A multiple D.
C.
power source as claimed in claim 1 and in which said primary D.
C.
voltage source comprises rechargeable battery cell means connected to be charged by said photovoltaic cell means.
3.
A multiple D.
C.
power source as claimed in claim 2 and in which said backup D.
C.
voltage source comprises non-rechargeable battery cell means.
4.
A multiple D.
C.
power source as claimed in claim 1 and in which said backup D.
C.
voltage source comprises non-rechargeable battery cell means.
5.
A method of conserving energy in a multiple power source for powering electrical and electronic products and in which a primary D

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