Apparatus for optimizing the charging of a rechargeable battery
First Claim
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1. An apparatus for trickle charging a rechargeable battery, said rechargeable battery having a fully charged voltage that varies with the ambient temperature;
- said apparatus comprises;
means, in parallel with said rechargeable battery, for providing a current path for a trickle charge current from a battery charger current source, said means having an effective impedance that varies inversely to the charge voltage of said rechargeable battery depending on said ambient temperature whereby when said rechargeable battery reaches said fully charged voltage substantially all current drawn from said current source flows through said current path providing means regardless of said ambient temperature, said current path providing means includinga plurality of PN junctions, said PN junctions connected in parallel with said rechargeable battery, said plurality of PN junctions includes a first PN juntion having an abrupt reverse biased breakdown voltage, said first PN junction being serially connected to the remainder of said plurality of PN junctions and reverse biased with respect to said rechargeable battery.
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Abstract
An apparatus for optimizing the charging of a rechargeable battery includes, in parallel with the rechargeable battery, a series of diodes selected to exhibit an effective impedance that is the inverse of the impedance of the rechargeable battery regardless of the ambient temperature.
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12 Claims
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1. An apparatus for trickle charging a rechargeable battery, said rechargeable battery having a fully charged voltage that varies with the ambient temperature;
- said apparatus comprises;
means, in parallel with said rechargeable battery, for providing a current path for a trickle charge current from a battery charger current source, said means having an effective impedance that varies inversely to the charge voltage of said rechargeable battery depending on said ambient temperature whereby when said rechargeable battery reaches said fully charged voltage substantially all current drawn from said current source flows through said current path providing means regardless of said ambient temperature, said current path providing means including a plurality of PN junctions, said PN junctions connected in parallel with said rechargeable battery, said plurality of PN junctions includes a first PN juntion having an abrupt reverse biased breakdown voltage, said first PN junction being serially connected to the remainder of said plurality of PN junctions and reverse biased with respect to said rechargeable battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- said apparatus comprises;
Specification