Electricity: battery or capacitor charging or discharging – Battery or cell charging – With current sensing to detect proper battery connection
Reexamination Certificate
2003-05-06
2004-07-06
Tso, Edward H. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell charging
With current sensing to detect proper battery connection
C320S105000
Reexamination Certificate
active
06759833
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a charger capable of switching polarity.
BACKGROUND OF INVENTION
A battery is a very important component for starting up a vehicle. When the battery contains too little power to start up the vehicle, it may be connected with another battery in parallel by means of two wires in order to start up the vehicle. However, attention must be paid to the polarity of the electrodes of the batteries. The positive electrode of the battery must be connected with the positive electrode of the other battery, and the negative electrode with the negative electrode. This causes trouble for a driver who is not at telling the positive electrode from the negative electrode or operates in the dark. If the positive electrode of the battery is connected with the negative electrode of the other battery, there will be sparks or explosion.
Taiwanese Patent Publication 521922 discloses a charger for a battery of a vehicle. This apparatus includes a circuit
55
for detecting a positive electrode and a circuit
56
for detecting a negative electrode. If a positive voltage is detected, a closed circuit is formed. If a negative voltage is detected, a beeper B is actuated in order to warn of wrong connection. Sound produced by means of the beeper B might make the driver tense. When learning of the wrong connection, the driver has to reconnect the charger with the battery.
U.S. Pat. No. 6130519 discloses a portable battery charger including an auto-polarity switch
50
. The auto-polarity switch
50
includes a coil assembly
51
and a switching assembly
53
. With three solenoids
60
,
62
and
64
and two springs
70
and
72
, applying the principle of repulsiveness of same polarity and attraction of different polarity, polarity is switched automatically. Malfunction is however quite possible because of residual magnetism and/or fatigue in electricity. Thus, the battery will be damaged.
The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.
SUMMARY OF INVENTION
It is the primary objective of the present invention to provide a charger for charging a battery from a source and capable of switching polarity. According to the present invention, a charger includes a first detection block for connection with a source of energy, a second detection block for connection with the source, a first switch connected with the first detection block, a second switch connected with the second detection block and a switch actuation block connected with the switches and for connection with a battery. The switch actuation block includes a first relay and a second relay. The first relay is turned on for sending power from the source to the battery when circuit flows through the first detection block and the first switch. The second relay is turned on for sending power from the source to the battery when circuit flows through the second detection block and the second switch.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the attached drawings.
REFERENCES:
patent: 5541495 (1996-07-01), Gali
patent: 6130519 (2000-10-01), Whiting et al.
patent: 6262492 (2001-07-01), Sheng
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