Cell capacity detector
First Claim
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1. A detector for determining the capacity of a cell, said detector comprising:
- (a) load means;
(b) switch means between said cell and said load means for connecting and disconnecting said cell from said load means, the connection of said cell to said load means causing said cell voltage to drop; and
(c) means to measure the time for the voltage of said cell to recover from said dropped cell voltage after said disconnection of said cell from said load means.
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Abstract
A capacity detector of a cell used as a source of power for a watch, camera or any other portable implement, wherein a resistive load is connected in series through a switch; the switch is opened immediately after a prescribed length of time; a speed of the cell voltage restoration is calculated which is required for a cell voltage restored after the opening of the switch to be brought back to a prescribed reference level; and the remaining capacity of the cell is numerically determined from said calculated length of time.
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Citations
10 Claims
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1. A detector for determining the capacity of a cell, said detector comprising:
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(a) load means; (b) switch means between said cell and said load means for connecting and disconnecting said cell from said load means, the connection of said cell to said load means causing said cell voltage to drop; and (c) means to measure the time for the voltage of said cell to recover from said dropped cell voltage after said disconnection of said cell from said load means.
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2. A detector for determining the capacity of a cell, said detector comprising:
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(a) load means; (b) switch means between said cell and said load means for connecting and then disconnecting said cell from said load means, the connection of said load means to said cell causing said cell voltage to drop; (c) means connected to said cell for detecting when said cell voltage equals a preset reference level after said switch means disconnects said cell from said load means; and (d) means connected to said detecting means for determining the restoration time of said cell by measuring the time between the disconnection of said cell from said load means by said switch means and the moment when said detecting means first indicates that said cell voltage equals said preset reference level. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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Specification