Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Reexamination Certificate
1999-08-13
2001-02-06
Tso, Edward H. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C320S166000
Reexamination Certificate
active
06184657
ABSTRACT:
The present invention generally relates to battery chargers, and more particularly to a battery charger which is adapted to increase the charge current to a battery without increasing the power supply to the battery charger.
Battery chargers which increase the charge current to the battery without increasing the power supply of the charger itself is known in the art. One such known battery charger includes an AC power supply which delivers a charge current directly to the battery via a forward biased diode during a positive half of the charge cycle. In the negative half cycle, however, the charge current is routed through a second diode and stored in a capacitor. The stored energy is then released to the battery along with the charge current from the power supply during the next positive half cycle, thereby increasing the total charge current to the battery.
These types of battery chargers, however, have poor current regulation, especially when charging batteries with different voltages, i.e., the charge current fluctuates significantly when a battery having a lower voltage is switched to one that has a relatively higher voltage, for example. Additionally, the battery chargers of the type described above do not protect the power supply from a short circuit across the output of the battery charger.
Accordingly, it is a primary objective of the present invention to provide an improved battery charger for increasing the charge current to the battery from a predetermined power supply.
Another object of the present invention is to provide such a battery charger having improved current regulation.
Still another object of the present invention is to provide such an improved battery charger which offers a better short circuit protection for the power supply.
Yet another object of the present invention is to provide such an improved battery charger having a pair of capacitors AC coupled to each other.
A related object of the present invention is to provide such an improved battery charger including an indicator which is activated when the battery is being charged.
A further object of the present invention is to provide such an improved battery charger including a transformer for supplying the charge energy.
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patent: 4387333 (1983-06-01), St. Ledger
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patent: 5204608 (1993-04-01), Koenck
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patent: 5552692 (1996-09-01), McKillop
patent: 5675232 (1997-10-01), Koenck
Diaz Jose R.
Gawell George R.
McCurdy Neal R.
Greer Burns & Crain Ltd.
S-B Power Tool Company
Tso Edward H.
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