发明名称 |
Method and apparatus for monitoring battery capacity |
摘要 |
A battery detect circuit (32) is connected to the battery with the current input to the battery and extracted from the battery measured with a sense resistor (50) and then converted to charge and discharge pulses with a V/F converter (52). A microcontroller (64) is operable to increment a Nominal Available Charge (NAC) register (180) during a charge operation, and to increment a Discharge Count Register (DCR) (184) during a discharge operation. The NAC register (180) indicates the available charge, which value is output to a display (34). The maximum value to which the NAC value can rise is limited by a value stored in the last measured discharge register (182). This value represents the value stored in the DCR (184) whenever the battery is discharged from an apparent full state to a fully discharged state. This results in a qualified transfer to the LMD register (182) such that no knowledge of the actual battery charge is necessary.
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申请公布号 |
US5284719(A) |
申请公布日期 |
1994.02.08 |
申请号 |
US19920910687 |
申请日期 |
1992.07.08 |
申请人 |
BENCHMARQ MICROELECTRONICS, INC. |
发明人 |
LANDAU, JOHN E.;MATTHEWS, WALLACE E.;FREEMAN, DAVID L. |
分类号 |
G01R31/36;H01M10/48;(IPC1-7):H01M10/48 |
主分类号 |
G01R31/36 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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