Apparatus for detecting a remaining capacity of a battery in a portable data transmission/reception device
First Claim
1. A signal processing system for detecting a remaining capacity of a battery, comprising:
- measuring means for measuring a battery voltage;
first detecting means for detecting a first time for said battery voltage to reach a predetermined level based on a pre-stored battery characteristic curve;
second detecting means for detecting a second time for said battery voltage to reach a predetermined threshold voltage based on said pre-stored battery characteristic curve;
estimating means for estimating a remaining time of a battery life of said battery based on said first time and said second time.
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Accused Products
Abstract
A controller of a card radio modem connectable to a data terminal measures two kinds of a battery voltage under a different load condition of the card radio modem. The controller determines the kind of battery and detects the remaining time of accuracy, based on the kind of the battery. In addition, the controller calculates an available capacity of a file data to be transmitted and received during the remaining time. When the available capacity is smaller than a capacity which is necessary to transmit and receive, the controller generates an alarm to inform an operator. The controller displays the available capacity or remaining time on a display.
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Citations
17 Claims
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1. A signal processing system for detecting a remaining capacity of a battery, comprising:
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measuring means for measuring a battery voltage; first detecting means for detecting a first time for said battery voltage to reach a predetermined level based on a pre-stored battery characteristic curve; second detecting means for detecting a second time for said battery voltage to reach a predetermined threshold voltage based on said pre-stored battery characteristic curve; estimating means for estimating a remaining time of a battery life of said battery based on said first time and said second time. - View Dependent Claims (2, 3, 4)
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5. A signal processing system having a radio modem connectable to a data terminal, said radio modem comprising:
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a radio section for transmitting a transmission data signal from said data terminal to a remote radio station and for receiving a reception data signal from said remote radio station; a battery for supplying a battery voltage to said radio section; and a first controller for measuring a battery voltage, detecting a first time for said battery voltage to reach a predetermined level based on a pre-stored battery characteristic curve, detecting a second time for said battery voltage to reach a predetermined threshold voltage based on said pre-stored battery characteristic curve, estimating a remaining time of a battery life of said battery based on said first time and said second time, and determining a data capacity of said data signal which is transmitted and received. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method for detecting a remaining capacity of a battery, the method comprising the steps of:
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measuring first and second battery voltages of said battery when the battery is under at least two load conditions respectively; identifying a kind of said battery based on a comparison of said first and second battery voltages; determining said remaining capacity by measuring a battery voltage, detecting a first time for said battery voltage to reach a predetermined level based on a pre-stored characteristic curve for said kind of said battery, detecting a second time for said battery voltage to reach a predetermined threshold voltage based on said characteristic curve; and calculating a remaining time of said battery based on said remaining capacity. - View Dependent Claims (12, 13)
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14. A method for controlling a detection of a remaining power of a battery, said battery supplying a battery power to a radio modem connectable to a data terminal, said radio modem transmitting and receiving a data signal, the method comprising the steps of:
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setting said radio modem into first and second load conditions; measuring first and second battery voltages of said battery when the battery is under said first and second load conditions respectively; identifying a kind of said battery based on a comparison of said first and second battery voltages; determining a remaining capacity by measuring a battery voltage, detecting a first time for said battery voltage to reach a predetermined level based on a pre-stored characteristic curve for said kind of said battery, detecting a second time for said battery voltage to reach a predetermined threshold voltage based on said characteristic curve; and calculating a remaining time of said battery based on said remaining capacity. - View Dependent Claims (15, 16, 17)
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Specification