Low voltage cutoff circuit for an electrochemical cell
First Claim
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1. A low voltage cutoff circuitry comprising:
- a) at least one primary electrochemical cell generating an electrical current powering a load;
b) a first switch in a closed position between the load and the at least one primary electrochemical cell so that the primary cell powers the load;
c) a sensing device that measures the at least one primary cell'"'"'s voltage, transmits a close signal to the first switch in order to maintain the connection between the at least one primary cell and the load when the at least one cell'"'"'s voltage is above a predetermined minimum threshold, and transmits an open signal to the first switch to disconnect the at least one primary cell from the load when the voltage is below the predetermined minimum threshold; and
d) a manually operable reset switch that prevents re-connection of the at least one primary cell through the first switch to the load even if the at least one primary cell'"'"'s open circuit voltage recovers to a value above the predetermined minimum threshold until the reset switch is manually reset.
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Abstract
The present invention is an electrical circuit that disconnects an electrochemical cell from a load when the cell'"'"'s voltage descends to a predetermined value. The present invention is also applicable to a battery configuration and its corresponding electrochemical cells. The predetermined value is designed to decrease the chance that the cell or battery will become unstable while connected to the load.
34 Citations
19 Claims
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1. A low voltage cutoff circuitry comprising:
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a) at least one primary electrochemical cell generating an electrical current powering a load; b) a first switch in a closed position between the load and the at least one primary electrochemical cell so that the primary cell powers the load; c) a sensing device that measures the at least one primary cell'"'"'s voltage, transmits a close signal to the first switch in order to maintain the connection between the at least one primary cell and the load when the at least one cell'"'"'s voltage is above a predetermined minimum threshold, and transmits an open signal to the first switch to disconnect the at least one primary cell from the load when the voltage is below the predetermined minimum threshold; and d) a manually operable reset switch that prevents re-connection of the at least one primary cell through the first switch to the load even if the at least one primary cell'"'"'s open circuit voltage recovers to a value above the predetermined minimum threshold until the reset switch is manually reset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A low voltage cutoff circuitry comprising:
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a) a battery comprised of at least a first primary electrochemical cell and a second primary electrochemical cell; b) the first electrochemical cell generating an electrical current having a first cell voltage; c) the second primary electrochemical cell generating an electrical current having a second cell voltage; d) the first electrical current and the second electrical current forming a battery electrical current having a battery voltage powering a load; e) a first switch positioned between the load and the primary battery so that the battery powers the load; f) a first sensing device that measures the battery voltage and transmits a first close signal to the first switch to maintain connection between the primary battery and the load when the battery'"'"'s voltage is above a predetermined minimum threshold voltage, and transmits an open signal to the first switch to disconnect the primary battery from the load when the battery'"'"'s voltage falls below the predetermined minimum threshold; and g) a manually operable reset switch that prevents re-connection of the battery to the load even if the battery'"'"'s voltage recovers to a value above the predetermined minimum threshold until the reset switch is manually reset. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification