Electric power conversion systems – Current conversion – Including automatic or integral protection means
Reexamination Certificate
1999-05-07
2001-06-05
Wong, Peter (Department: 2838)
Electric power conversion systems
Current conversion
Including automatic or integral protection means
C363S050000, C323S907000, C323S901000
Reexamination Certificate
active
06243276
ABSTRACT:
The present invention generally relates to power supplies for battery operated devices, and more particularly to an AC power supply system which is adapted to supply DC power to battery operated devices.
It is common for power devices or tools such as drills, circular saws, sanders, etc., to be battery powered. Battery power supplies come in the form of cordless power packs which are adapted to lock directly onto the tools. One disadvantage associated with the battery power supplies, however, is that the batteries discharge with use, and have to be recharged periodically. The batteries could be recharged during the interim when the tool is not being used so that the batteries would be fully charged when the tool is ready for use. However, such opportune time for recharging the batteries is not always available. Further, even if the batteries are fully charged, they may still discharge on their own if they are stored for an extended period of time.
Many power tool users carry an alternate set of batteries for replacing the main batteries when they are discharged. However, this does not completely eliminate the problems associated with battery power supplies, because the backup batteries are also subject to the same disadvantages described above. Another known solution involves employing a power transformer device for converting AC power to DC power and supplying the converted DC power to the tool. A disadvantage of this solution is that the transformer contained in the device tends to heat-up and damage the electronics of the transformer device. Increasing the size of the transformer would prevent or at least alleviate the over-heating problem. However, a power supply having a large transformer would not be desirable because the size and the weight of the power supply would make it difficult to use the tool.
Accordingly, it is a primary objective of the present invention to provide an improved system for supplying power to a battery operated power device.
Another object of the present invention to provide an improved power supply system which does not require being recharged and does not discharge during the operation of the power device.
Still another object of the present invention is to provide such an improved power supply system which is constructed and adapted to replace an existing battery supply.
Yet another object of the present invention is to provide such an improved power supply system including a protection circuit which automatically prevents the temperature of the supply system from reaching an undesirable point which may damage the supply system.
A related object of the present invention is to provide such an improved power supply system having a relatively small power transforming component.
A further object of the present invention is to provide such an improved power supply system including indicating devices which operate correspondingly with the protection device to inform the user of the operating condition of the power supply system.
It is also an object of the present invention to provide such an improved power supply system which is adapted to be the original power supply for a tool or a replacement or a substitute power supply for an existing battery-operated tool.
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Greer, Burns & Crain, LT
S-B Power Tool Company
Vu Bao Q.
Wong Peter
LandOfFree
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