Safety Circuit For Charging Devices
First Claim
1. A method comprising:
- a closing a latch to stop delivery of a charging current to a battery when voltage produced by the battery indicates that the battery is non-rechargeable;
dropping a threshold from an initial value for the voltage produced by the battery to a baseline value so that the latch remains closed even if the voltage produced by the non-rechargeable battery drops below the initial value of the threshold; and
resetting the latch each time a battery is connected to the charging device.
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Abstract
Systems and methods for implementing a safety circuit in charging devices are disclosed. In an exemplary embodiment, a method may include closing a latch to stop delivery of a charging current to a battery when voltage produced by the battery indicates that the battery is non-rechargeable. The method may also include dropping a threshold from an initial value for the voltage produced by the battery to a baseline value so that the latch remains closed even if the voltage produced by the non-rechargeable battery drops below the initial value of the threshold. The method may also include resetting the latch each time a battery is connected to the charging device.
27 Citations
20 Claims
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1. A method comprising:
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a closing a latch to stop delivery of a charging current to a battery when voltage produced by the battery indicates that the battery is non-rechargeable; dropping a threshold from an initial value for the voltage produced by the battery to a baseline value so that the latch remains closed even if the voltage produced by the non-rechargeable battery drops below the initial value of the threshold; and resetting the latch each time a battery is connected to the charging device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A safety circuit for a charging device comprising:
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a first comparator configured to compare voltage produced by a battery to a threshold, output from the first comparator indicating if a battery is a rechargeable battery or a non-rechargeable battery; a second comparator receiving the output from the first comparator, the second comparator latching closed to stop delivery of a charging current to the battery if the battery is non-rechargeable; and a reset circuit coupled the first comparator and the second comparator, the reset circuit issuing a reset signal to the first comparator and the second comparator each time a battery is connected to the charging device. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system comprising:
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latch means for stopping delivery of a charge from a charging device to a battery connected to the charging device when the battery is a non-rechargeable battery; means for holding the latch means closed until a reset event; and means for activating the reset event each time a battery is connected to the charging device. - View Dependent Claims (19, 20)
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Specification