WO2004053511A1 - Detecteur de courant et systeme de detection de la puissance restante d'une batterie - Google Patents

Detecteur de courant et systeme de detection de la puissance restante d'une batterie Download PDF

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Publication number
WO2004053511A1
WO2004053511A1 PCT/JP2003/015847 JP0315847W WO2004053511A1 WO 2004053511 A1 WO2004053511 A1 WO 2004053511A1 JP 0315847 W JP0315847 W JP 0315847W WO 2004053511 A1 WO2004053511 A1 WO 2004053511A1
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WO
WIPO (PCT)
Prior art keywords
voltage
reference voltage
current
battery
current detection
Prior art date
Application number
PCT/JP2003/015847
Other languages
English (en)
Japanese (ja)
Inventor
Kenichi Ohkubo
Original Assignee
Sanyo Electric Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co., Ltd. filed Critical Sanyo Electric Co., Ltd.
Publication of WO2004053511A1 publication Critical patent/WO2004053511A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables

Definitions

  • the present invention is directed to a remaining amount detection system that calculates a discharge current flowing through a power supply line based on a voltage between terminals of a current detection resistance element, and calculates a remaining amount of a battery from the calculated current value, and a current used in the system. It relates to a detection device. Background art
  • Batteries are often used as power sources for portable electronic devices such as mobile phones and digital cameras. Since these batteries are storage batteries,
  • the battery capacity that can be used once is limited and must be charged before it is exhausted.
  • the remaining battery level is displayed on a display device installed in the device.
  • a method of detecting the remaining amount of the battery for performing such display a method of detecting the amount of discharge current flowing through a power supply line connected to the battery and calculating the remaining amount of the battery from the detected amount of current has been used. It is known (for example, Japanese Patent Application Laid-Open No. Hei 4-332580).
  • FIG. 1 is a block diagram of a conventional battery remaining power detection system.
  • the device body 1 is, for example, a mobile phone or a digital camera. Inside the main unit 1, there are a main unit load 27 that performs the original functions of the mobile phone and digital camera, a control microcomputer 22 that controls the overall operation of the main unit 1, and a standby screen for the mobile phone.
  • a display device 23 for displaying an image captured by the camera is provided.
  • the battery pack 2 is detachable from the device body 1. Inside the battery pack 2, a battery 11, a current detecting resistor 24, a current detecting circuit 21, and a remaining amount calculating microcomputer 12 are provided.
  • the current detection resistance element 24 is a minute resistance provided in the middle of the power supply line 28, and the voltage V i between the terminals of the minute resistance is extracted by the current detection circuit 21.
  • the current detection circuit 21 includes an amplifier 25 and an AZD converter 26.
  • the amplifier 25 is connected to the current detecting resistance element 24, amplifies the voltage V i extracted from the current detection resistance element 24, and generates an amplified voltage V i '. Is output.
  • the octano converter 26 receives the amplified voltage V i ′ from the amplifier 25, normalizes the amplification voltage V i ′, converts it into digital data, and generates voltage data D (V i).
  • the remaining amount calculation microcomputer 12 receives the voltage data D (V i) from the current detection circuit 21 and calculates a discharge current I flowing through the power supply line 28 based on the voltage data D (V i). Calculate the remaining battery capacity of battery 11 from discharge current I. The calculated remaining battery level is transferred to the control microphone port computer 22 via the communication line 29, and the control microphone port computer 22 displays the remaining battery level on the display device 23.
  • the present invention provides a remaining amount detection system and a current detection device that can accurately calculate the value of a current flowing through a power supply line without being affected by a gain error of an amplifier or an output error of an AZD converter. With the goal.
  • the present invention relates to a remaining amount detecting device that calculates the remaining amount of a battery.
  • a current detection device that supplies data representing the amount of discharge current flowing through a power supply line having a current detection resistance element disposed in the power line.
  • the current detection device includes: a reference voltage generation circuit that generates a reference voltage; first data corresponding to a terminal-to-terminal voltage of a current detection resistance element arranged in the power supply line; and a reference voltage corresponding to the reference voltage.
  • the present invention further discloses a system for detecting a remaining battery level.
  • the system includes a current detection device that is connected to the battery and generates data representing a discharge current amount flowing through a power supply line having a current detection resistance element disposed in the middle thereof, and a remaining device that calculates a remaining amount of the battery.
  • An amount detection device The current detection device generates a reference voltage generation circuit that generates a reference voltage, first data corresponding to a voltage between terminals of the current detection resistance element, and second data corresponding to the reference voltage.
  • an AD conversion circuit The remaining amount detection device calculates the amount of discharge current based on the first and second data, and integrates the calculated amount of current to calculate the remaining amount of the battery.
  • FIG. 1 is a block diagram of a conventional battery remaining power detection system.
  • FIG. 2 is a block diagram of a battery remaining amount detection system according to a preferred embodiment of the present invention.
  • FIG. 3 is a flowchart for explaining the operation of the battery remaining amount detection system in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 2 is a block diagram of the battery remaining power detection system according to the preferred embodiment of the present invention. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.
  • Device body 1 a is, for example, an electronic device such as a mobile phone or a digital camera, in addition to the main body load 2 7 control microcomputer Ichita 2 2, for detecting the current flowing amount of the power supply line 2 8 As components, a current detecting resistor element 24 and a current detecting circuit 30 are provided.
  • the current detecting resistance element 24 is a minute resistance provided in the middle of the power supply line 28.
  • the voltage V i between the terminals of the current detection resistance element 24 is taken out by the current detection circuit 30.
  • the current detection circuit 30 includes a reference voltage generator 31, a selector 32, an amplifier 25, an AZD converter 26, and an output unit 33.
  • the reference voltage generator 31 generates a reference voltage Vb from the power supply voltage of the device body 1a.
  • the reference voltage generator 31 is, for example, This is a gap-type reference voltage source, and can stably output the reference voltage Vb in response to temperature changes, power supply voltage fluctuations, and manufacturing variations.
  • the band gap type reference voltage generation source is a voltage source for the reference voltage Vr for the AZD converter 26.
  • the bandgap-type reference voltage source has a characteristic that unless the output voltage is about 1.2 V, a stable output voltage cannot be output with respect to a temperature change or the like. For this reason, for an AZD converter that requires a voltage higher than 1.2 V as a reference voltage, a non-gap-type reference voltage source cannot be used as a reference voltage Vr.
  • the selector 32 connects the first input terminal S a connected to one terminal of the current detecting resistance element 24 and the second input terminal S b connected to the output terminal of the reference voltage generator 31. Have.
  • the selector 32 operates, for example, in response to a selection signal SEL supplied from the control microcomputer 22 and selects one of the two input terminals Sa and Sb (V i, V b). And output.
  • the selector 32 selects the inter-terminal voltage Vi and the reference voltage Vb in a time-division manner according to the selection signal SEL.
  • the amplifier 25 is connected to the output terminal of the selector 32, amplifies the inter-terminal voltage Vi and the reference voltage Vb of the current detecting resistance element 24, and generates the first amplified voltage Vi ′ and the second amplified voltage V Generate b 'respectively.
  • the AZD converter 26 operates by receiving the reference voltage Vr generated from the voltage of the power supply line 28, and converts the first and second amplified voltages V i ′, Vb ′ output from the amplifier 25 into digital data. The conversion generates first and second voltage data D (V i) and D (Vb), and outputs the first and second voltage data D (V i) and D (Vb).
  • the output unit 33 is connected to the output terminal of the AZD converter 26, receives the first and second voltage data D (Vi) and D (Vb), and converts the data into a format such as a parallel / serial conversion. The data is converted and output to the communication line 29.
  • the battery pack 2a is attachable to and detachable from the device body 1a, and includes a battery 11 and a computer 34 for calculating the remaining capacity of microphone.
  • Microcomputer for calculating remaining amount The computer 34 receives the two data D (Vi) and D (Vb) transferred via the communication line 29, calculates a ratio D (Vi) / D (Vb), and based on the calculated ratio. Then, the discharge current I flowing through the power supply line 28 is calculated, the remaining battery level is calculated from the current I, and the remaining battery level is supplied to the control microcomputer 22 of the device body 1a via the communication line 29. .
  • the computer 34 for calculating the remaining amount of microphone and the current detection circuit 30 are separately mounted, and the current detection circuit 30 is mounted on the main body of the device.
  • the microcomputer is mounted on the battery pack 2a.
  • FIG. 3 is a flowchart illustrating the operation of FIG. The processing of steps S1 to S4 is performed on the device body 1a side, and the processing of steps S5 to S7 is performed on the battery pack 2a side.
  • step S1 the selector 32 selects the first input terminal Sa, and supplies the first voltage Vi to the amplifier 25.
  • step S2 the amplifier 25 amplifies the first voltage V i to generate a first amplified voltage V i ′, and supplies the first amplified voltage V i ′ to the AZD converter 26.
  • the AZD converter 26 converts the first amplified voltage V i ′ into digital data (first voltage data D (V i)), and the output unit 33 converts the first voltage data D (V i) into a communication line. 2 Output to 9.
  • step S3 the selector 32 selects the second input terminal Sb, and supplies the second voltage Vb to the amplifier 25.
  • step S4 the amplifier 25 amplifies the second voltage Vb to generate a second amplified voltage Vb ', and supplies the second amplified voltage Vb' to the AZD converter 26.
  • the A / D converter 26 converts the second amplified voltage Vb 'into digital data, and the output unit 33 outputs the second voltage data D (Vb) to the communication line 29.
  • step S5 the remaining amount calculation microcomputer 34 performs an operation on the received first and second voltage data D (V i) and D (Vb) to obtain the first voltage data D (V i) and The ratio D (V i) / ⁇ (Vb) to the second voltage data D (Vb) is calculated.
  • the microcomputer 34 calculates the first voltage obtained in step S2.
  • the data D (V i) is retained by dividing the retained data D (V i) by the second voltage data D (V b) obtained in step S4. Calculate D (V b).
  • step S6 a discharge current I flowing through the power supply line 28 is calculated. For example, in step S6, first, based on the ratio D (V i) / ⁇ (V b) of the two voltage data calculated in step S5, the voltage V i between the terminals of the current detecting resistance element 24 is determined. Is calculated.
  • the value of the second voltage data D (V i) in step S2 is expressed by equation (1).
  • Ga is the gain of the amplifier
  • N is the number of bits of digital data output from the A / D converter 26.
  • Equation 3 (Vr / 2 N )
  • the inter-terminal voltage Vi can be calculated according to Equation 3.
  • the reference voltage Vb is the output voltage of the reference voltage generator 31, it is a voltage that always shows a constant value. By storing it, the operation of Equation 3 can be performed.
  • a current flowing through the current detecting resistance element 24, that is, a discharge current I flowing through the power supply line 28 is calculated using the following equation.
  • R is the resistance value of the current detection resistance element 24.
  • step S7 the remaining amount of the battery 11 is calculated using the current I.
  • the current I The time interval at which the first and second voltage data D (V i) and D (V b) are transmitted from the detection circuit 30 is defined as the first and second voltages transmitted by the ⁇ and ⁇ -th current detections.
  • Voltage data is D (V in), D (V bn), and the current value calculated from these two voltage data is I (n), ⁇ from the n-th current detection to the ( n + 1) -th current detection
  • I ( ⁇ ) ⁇ ⁇ 1 The integrated current discharged during t is represented by I ( ⁇ ) ⁇ ⁇ 1: Then, the accumulated amount of discharge current I ( ⁇ ) ⁇ ⁇ t is measured in advance when the battery 11 is charged, and is subtracted from the accumulated remaining battery amount, so that the remaining battery amount of the battery 11 is reduced. Is calculated.
  • the current detection circuit 30 including the reference voltage generation unit 31 outputs the first and second voltage data D (V i) and D (V b).
  • the remaining amount calculation microcomputer 34 calculates the inter-terminal voltage Vi using the ratio D (Vi) / V (Vb) of the first and second voltage data.
  • the discharge current I can be obtained without being affected by the gain error of the amplifier 25 or the output error due to the fluctuation of the reference voltage Vr with respect to the A / D converter 26.
  • the first and second voltage data D (V i) and D (V b) include the gain error of the amplifier 25 and the output error of the A / D converter 26 by substantially the same amount.
  • the ratio D (V i) / ⁇ (V b) of the two voltage data the errors included in the two voltage data cancel each other out.
  • the terminal voltage V i is calculated by multiplying this ratio by the reference voltage V b stored in the remaining capacity calculation microcomputer 34. Therefore, the terminal voltage V i is a true value that does not include an error. Therefore, the discharge current I flowing through the power supply line 28 can be accurately derived, and the battery remaining amount can be accurately calculated.
  • the current detection circuit 30 is mounted on the device body 1a, but is not limited to this. That is, as shown in FIG. 1, the current detection circuit 30 may be mounted on the battery pack 2a. Further, instead of performing the process of obtaining the ratio of the first and second voltage data D (V i) and D (V b) by the remaining amount calculation microcomputer 34, the current detection circuit 30 may perform the process. In this case, a circuit for calculating the remaining amount is provided in the current detection circuit 30.
  • the value of the discharge current flowing through the power supply line can be accurately calculated without being affected by the gain error of the amplifier or the output error of the AZD converter, The remaining battery capacity of the battery connected to the power line can always be accurately calculated.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Secondary Cells (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un système de détection de la puissance restante d'une batterie destiné à détecter de manière stable la puissance restante d'une batterie avec précision et comprenant un circuit de détection (30) de courant installé dans un corps (1a) d'un dispositif, et un micro-ordinateur (34) de calcul de la puissance restante installé dans un bloc-batterie (2a). Le circuit de détection du courant comprend une partie (31) générant une tension de référence destinée à générer une tension de référence (Vb) et un convertisseur A/N (26) destiné à convertir la tension de référence (Vb) et la tension aux bornes (Vi) de l'élément résistif (24) détectant le courant en deux pièces (D(Vi), D(Vb)) de données numériques. Le micro-ordinateur de calcul de puissance restante calcule le courant de décharge (I) passant dans une ligne d'alimentation en courant (28) par utilisation du rapport entre les deux pièces de données numériques.
PCT/JP2003/015847 2002-12-12 2003-12-11 Detecteur de courant et systeme de detection de la puissance restante d'une batterie WO2004053511A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002360923A JP2004191241A (ja) 2002-12-12 2002-12-12 電流検出装置及び残量検出システム
JP2002-360923 2002-12-12

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WO2004053511A1 true WO2004053511A1 (fr) 2004-06-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102064567A (zh) * 2010-09-07 2011-05-18 无敌科技(西安)有限公司 一种解决电池低电后虚电的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101793946A (zh) * 2010-04-12 2010-08-04 无敌科技(西安)有限公司 一种使电池电量单调变化的方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02146936A (ja) * 1988-11-28 1990-06-06 Olympus Optical Co Ltd 電源システム
JPH04323580A (ja) * 1991-04-23 1992-11-12 Matsushita Electric Works Ltd 電池容量表示装置
JPH05203459A (ja) * 1992-01-24 1993-08-10 Mitsubishi Electric Corp 計測装置
JPH07191110A (ja) * 1993-12-27 1995-07-28 Toshiba Battery Co Ltd 二次電池の容量表示装置
JPH08149707A (ja) * 1994-11-18 1996-06-07 Canon Inc 電池の充電方法及び電源装置
JPH08189940A (ja) * 1995-01-09 1996-07-23 Yokogawa Electric Corp ディジタル測定器
JPH09311147A (ja) * 1996-05-24 1997-12-02 Matsushita Electric Ind Co Ltd 充放電電流測定装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02146936A (ja) * 1988-11-28 1990-06-06 Olympus Optical Co Ltd 電源システム
JPH04323580A (ja) * 1991-04-23 1992-11-12 Matsushita Electric Works Ltd 電池容量表示装置
JPH05203459A (ja) * 1992-01-24 1993-08-10 Mitsubishi Electric Corp 計測装置
JPH07191110A (ja) * 1993-12-27 1995-07-28 Toshiba Battery Co Ltd 二次電池の容量表示装置
JPH08149707A (ja) * 1994-11-18 1996-06-07 Canon Inc 電池の充電方法及び電源装置
JPH08189940A (ja) * 1995-01-09 1996-07-23 Yokogawa Electric Corp ディジタル測定器
JPH09311147A (ja) * 1996-05-24 1997-12-02 Matsushita Electric Ind Co Ltd 充放電電流測定装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102064567A (zh) * 2010-09-07 2011-05-18 无敌科技(西安)有限公司 一种解决电池低电后虚电的方法

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JP2004191241A (ja) 2004-07-08
TW200420897A (en) 2004-10-16
TWI229742B (en) 2005-03-21

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