Device for displaying remaining battery capacity
First Claim
1. A device for displaying a remaining capacity of a rechargeable battery, comprising:
- a current sensing resistor connected between an external power source and said rechargeable battery, for sensing a charge current and a discharge current of said rechargeable battery;
a current-to-frequency converter for converting said charge and discharge currents into charge and discharge count signals having charge and discharge frequencies, respectively;
a microprocessor for directly receiving said charge and discharge count signals independently and comparing the respective charge and discharge frequencies with a predetermined frequency, thereby calculating the remaining capacity of the rechargeable battery and generating display data relating thereto; and
a display for displaying the remaining capacity according to said display data.
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Accused Products
Abstract
A device for displaying the remaining capacity of a rechargeable battery is provided. The device includes a current sensing resistor connected between an external power source and the rechargeable battery, for sensing the charge current and the discharge current of the rechargeable battery. A current-to-frequency converter converts the charge and discharge currents into first and second count signals having first and second frequencies. A microprocessor compares the first and second frequencies with a predetermined frequency, to measure the remaining capacity of the rechargeable battery and generate display data accordingly. A display displays the remaining capacity of the battery. Therefore, the device can accurately display the remaining capacity and charging state of the rechargeable battery, without employing an expensive A/D converter.
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Citations
8 Claims
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1. A device for displaying a remaining capacity of a rechargeable battery, comprising:
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a current sensing resistor connected between an external power source and said rechargeable battery, for sensing a charge current and a discharge current of said rechargeable battery; a current-to-frequency converter for converting said charge and discharge currents into charge and discharge count signals having charge and discharge frequencies, respectively; a microprocessor for directly receiving said charge and discharge count signals independently and comparing the respective charge and discharge frequencies with a predetermined frequency, thereby calculating the remaining capacity of the rechargeable battery and generating display data relating thereto; and a display for displaying the remaining capacity according to said display data. - View Dependent Claims (2, 3)
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4. An apparatus for indicating the remaining capacity of a rechargeable battery comprising:
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means for sensing a charge and discharge current of the rechargeable battery; means for converting the charge and discharge currents into charge and discharge count signals having charge and discharge frequencies, respectively; a microprocessor for directly receiving said charge and discharge count signals independently and comparing the respective charge and discharge frequencies with a predetermined frequency, thereby calculating the remaining capacity of the rechargeable battery and generating display data relating thereto; and means for displaying the remaining capacity of the rechargeable battery. - View Dependent Claims (5, 6, 7, 8)
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Specification