Charging apparatus for car storage batteries
First Claim
1. A charging apparatus for car storage batteries for inserting cigar light plug into cigar jacks in two cars, one is to supply a power source and the other is to be supplied with the power source, and for charging the car to be supplied with the power source, said apparatus comprising:
- a voltage converting means, which includes a power source of low voltage directly insulated from input, for overlapping voltage from a voltage generation circuit to input voltage and for obtaining enough charging current by securing voltage difference from two storage batteries;
a current limiting means which includes a current detecting resistance, for generating voltage drop in both ends of the current detecting resistance when charging current from storage battery exceeds a predetermined value and for lowering output current when voltage drop is higher than voltage from a first dividing resistance which is connected to a predetermined reference voltage; and
a voltage regulating means which is connected to an output terminal and for lowering output voltage when voltage from a second dividing resistance is higher than the predetermined reference voltage.
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Abstract
The present invention is a charging apparatus devised to make it possible with the help of another car to start a failed engine resulted from an old storage battery or from over-charging by inserting cigar jack in a car without opening the bonnet and without the issue of polarity arising. In general, enough current can'"'"'t be attained even if storage batteries in two cars are connected through a cigar jack. This is due to the narrow difference between the voltage of the two storage batteries. Furthermore, sufficient current can not be attained and it takes a long time because the voltage drop caused by internal resistance in the cable is not negligible. To resolve such problems, the present invention includes a small-sized switch mode power supply, generates needed voltage from the power source and outputs the voltage overlapped to the supplying voltage, which creates an effective charging in a short time. In addition, it aims to achieve safer operation by built-in maximum current limiting circuit and voltage regulating circuit.
25 Citations
20 Claims
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1. A charging apparatus for car storage batteries for inserting cigar light plug into cigar jacks in two cars, one is to supply a power source and the other is to be supplied with the power source, and for charging the car to be supplied with the power source, said apparatus comprising:
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a voltage converting means, which includes a power source of low voltage directly insulated from input, for overlapping voltage from a voltage generation circuit to input voltage and for obtaining enough charging current by securing voltage difference from two storage batteries; a current limiting means which includes a current detecting resistance, for generating voltage drop in both ends of the current detecting resistance when charging current from storage battery exceeds a predetermined value and for lowering output current when voltage drop is higher than voltage from a first dividing resistance which is connected to a predetermined reference voltage; and a voltage regulating means which is connected to an output terminal and for lowering output voltage when voltage from a second dividing resistance is higher than the predetermined reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification