초록 ▼

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 curren

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.

대표청구항 ▼

[ What is claimed is:] [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 curr

[ What is claimed is:] [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; anda display for displaying the remaining capacity according to said display data.