US4849700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detecting residual capacity of battery
Assignee: Toshiba Corp
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Filing: 1988-03-15
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Granted: 1989-07-18
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Expires: 2008-03-15
Abstract
Abstract A device for detecting the residual capacity of a battery comprises a battery current measuring circuit for measuring battery current, a battery voltage measuring circuit for measuring battery voltage, a converting circuit for converting the measured current into a voltage value, based on the internal impedance of the battery, and a comparator circuit for comparing the conversion voltage value with the measured voltage. When the measured voltage is smaller than the conversion voltage value, the comparator circuit operates a battery residual-capacity detect signal indicating that the residual capacity of the battery is small.
Inventors
- 👤 Shizuo Morioka
- 👤 Yuichi Saitoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:20
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/36; G01R31/389
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A device for detecting the residual capacity of a battery, comprising: current measuring means for measuring a discharge current of the battery; voltage measuring means for measuring a voltage of the battery; converting means for converting one of the measured discharge current of the battery and the measured battery voltage into a value conforming to discharge characteristics of the battery; and comparing means for comparing the conversion value with the other of the measured discharge current of the battery and the measured battery voltage, to output the result of comparison in the form of a residual capacity detect signal.
Claim 2
Independent Claim
99 words
A device for detecting the residual capacity of a battery, comprising: current measuring means for measuring a discharge current of the battery; voltage measuring means for measuring a voltage of the battery; converting means for converting one of the measured discharge current of the battery and the measured battery voltage into a value conforming to discharge characteristics of the battery; and comparing means for comparing the conversion value with the other of the measured discharge current of the battery and the measured battery voltage, to output the result of comparison in the form of a residual capacity detect signal.
Claim 3
Independent Claim
82 words
A device for detecting the residual capacity of a battery, comprising: current measuring means for measuring a discharge current of the battery; voltage measuring means for measuring a voltage of the battery; converting means for converting the measured discharge current of the battery into a value, based on an internal impedance of the battery; and comparing means for comparing the conversion value with the measured battery voltage, to output the result of comparison in the form of a residual capacity detect signal.
Claim 4
Independent Claim
82 words
A device for detecting the residual capacity of a battery, comprising: current measuring means for measuring a discharge current of the battery; voltage measuring means for measuring a voltage of the battery; converting means for converting the measured discharge current of the battery into a value, based on an internal impedance of the battery; and comparing means for comparing the conversion value with the measured battery voltage, to output the result of comparison in the form of a residual capacity detect signal.
Claim 5
Dependent Claim
37 words
The device according to claim 2, wherein said comparing means outputs an alarm signal indicating that the residual capacity of the battery is small when the measured voltage is detected to be smaller than the conversion value.
Claim 6
Dependent Claim
48 words
The device according to claim 2, wherein the value obtained by said converting means is a voltage value based on a compensating function V LOW=f (I) where V LOW is a detection level voltage used for detecting Low Battery, and I is a discharge current of the battery.
Claim 7
Independent Claim
81 words
A device for detecting the residual capacity of a battery, comprising: current measuring means for measuring a discharge current of the battery; voltage measuring means for measuring a voltage of the battery; converting means for converting the measured battery voltage into a value, based on an internal admittance of the battery; and means for comparing the conversion value with the measured discharge current of the battery, to output the result of comparison in the form of a residual capacity detect signal.
Claim 8
Independent Claim
81 words
A device for detecting the residual capacity of a battery, comprising: current measuring means for measuring a discharge current of the battery; voltage measuring means for measuring a voltage of the battery; converting means for converting the measured battery voltage into a value, based on an internal admittance of the battery; and means for comparing the conversion value with the measured discharge current of the battery, to output the result of comparison in the form of a residual capacity detect signal.
Claim 9
Dependent Claim
41 words
The device according to claim 5, wherein said comparing means outputs an alarm signal indicating that the residual capacity of the battery is small when the measured discharge current of the battery is detected to be smaller than the conversion value.
Claim 10
Dependent Claim
51 words
The device according to claim 5, wherein the value obtained by said converting means is a current value based on a compensating function I LOW =g(V T ) where I LOW is a detection level current adapted for detecting low battery, and V T is the measured voltage of the battery.
Claim 11
Independent Claim
99 words
A device for detecting the residual capacity of a battery, comprising: current measuring means for measuring a discharge current of the battery; voltage measuring means for measuring a voltage of the battery; converting means for converting the measured discharge current of the battery into a first value, based on an internal impedance of the battery, and the measured battery voltage into a second value, based on an internal admittance of the battery; and means for making a comparison between the first and second values, to output the result of comparison in the form of a residual capacity detect signal.
Claim 12
Independent Claim
99 words
A device for detecting the residual capacity of a battery, comprising: current measuring means for measuring a discharge current of the battery; voltage measuring means for measuring a voltage of the battery; converting means for converting the measured discharge current of the battery into a first value, based on an internal impedance of the battery, and the measured battery voltage into a second value, based on an internal admittance of the battery; and means for making a comparison between the first and second values, to output the result of comparison in the form of a residual capacity detect signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |