WO2003047066A1 - Procede de regulation de charge et regulateur de charge - Google Patents

Procede de regulation de charge et regulateur de charge Download PDF

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Publication number
WO2003047066A1
WO2003047066A1 PCT/JP2002/012292 JP0212292W WO03047066A1 WO 2003047066 A1 WO2003047066 A1 WO 2003047066A1 JP 0212292 W JP0212292 W JP 0212292W WO 03047066 A1 WO03047066 A1 WO 03047066A1
Authority
WO
WIPO (PCT)
Prior art keywords
charging
power supply
battery
charging current
external power
Prior art date
Application number
PCT/JP2002/012292
Other languages
English (en)
Japanese (ja)
Inventor
Takafumi Hashimoto
Takayuki Tago
Yoji Fujiwara
Koji Abe
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to AU2002365524A priority Critical patent/AU2002365524A1/en
Publication of WO2003047066A1 publication Critical patent/WO2003047066A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current

Definitions

  • the present invention relates to a charge control method and a charge control device suitable for use in a communication terminal such as a mobile phone or a PHS.
  • a communication terminal such as a mobile phone or a PHS.
  • FIG. 1 is a block diagram showing a configuration of a conventional charge control device.
  • the conventional charge control device 50 shown in FIG. 1 includes a charge current detection resistor 3 inserted on the charge / discharge path between the battery 1 and the external power supply 2, a charge current detection resistor 3 and an external FET 4 for controlling the charging voltage inserted on the charge / discharge path between the power supply 2 and the current detection circuit 5 for detecting the charging current based on the voltage between both ends of the resistor 3 for detecting the charging current, and current detection
  • a charge voltage control circuit 6 that detects the charging voltage based on the detection output of the circuit 5 and turns off the FET 4 when it reaches full charge, and the output power between the battery 1 and the charging current detection resistor 3
  • a power output terminal 7 for extracting the
  • the charging current supplied to the battery 1 is detected by the voltage between both ends of the charging current detecting resistor 3, and when the detected charging current gradually decreases and reaches a predetermined end current, that is, the battery 1 is discharged. Turn off FET 4 when fully charged.
  • the output power of the present device is extracted from between the battery 1 and the charging current detecting resistor 3 as described above.
  • the operating voltages of the current detection circuit 5 and the charging voltage control circuit 6 are obtained from the battery 1 because FET is turned off at the time of full charge.
  • the conventional charge control device has the following problems. That is, the output power is extracted between the battery 1 and the charging current detection resistor 3. If the operation is performed on the electronic device while the battery 1 is being charged, for example, if the mobile phone enters the transmission state or the display unit or the operation unit is turned on, the operation is performed. The current flows (see Fig. 2), making it impossible to detect the pure charging current and causing variations in the full charging voltage. Disclosure of the invention
  • An object of the present invention is to provide a charge control method and a charge control device that can always detect only a charge current in battery charge control.
  • the purpose of the present invention is to allow a charging control device to control a charging current to a battery based on a detection result of a charging current to a battery which is supplied with power from an external power supply, so that only the charging current flows to a circuit for detecting the charging current This can be achieved by enabling detection of only the charging current even when the load operates during battery charging.
  • FIG. 1 is a block diagram showing a configuration of a conventional charge control device
  • Fig. 2 is a diagram for explaining the problems of the conventional charge control device.
  • FIG. 3 is a block diagram showing a configuration of the charging control device according to the embodiment of the present invention.
  • FIG. 4 is a diagram showing a circuit configuration of the charge control device according to the embodiment of the present invention.
  • FIG. 3 is a block diagram showing a configuration of the charge control device according to the embodiment of the present invention. Note that, in this figure, the same parts as those in FIG. 1 described above are denoted by the same reference numerals.
  • a charge control device 100 comprises: a charge current detection resistor 3 inserted on a charge / discharge path between a battery 1 and an external power supply 2; Charge voltage control FET 4 inserted on the charge / discharge path between detection resistor 3 and external power supply 2, and charge current flowing into battery 1 based on the voltage across charge current detection resistor 3.
  • the charging current supplied to the battery 1 is detected by the voltage between both ends of the charging current detecting resistor 3, and when the detected charging current gradually decreases and reaches a predetermined end current, that is, the battery Turn off FET 4 when 1 reaches full charge voltage.
  • the output power of this device is different between the charge current detection resistor 3 and the FET 4 (that is, the charge / discharge path from the charge current detection resistor 3 to the external power supply 2). Above).
  • the FET 8 when the power supply from the external power supply 2 is interrupted, the FET 8 is turned on to short-circuit both ends of the charging current detection resistor 3, and when the power supply from the external power supply 2 is restored, the short circuit is performed. Since the power is released, the power loss due to the charging current detection resistor 3 can be eliminated when the power is supplied only from the battery 1 without using the external power supply 2, and a reduction in the battery life can be avoided.
  • the operation current of the current detection circuit 5 and the charge voltage control circuit 6 is determined because the FET 4 is turned off when the battery is fully charged. Pressure is obtained from battery 1.
  • the FET 8 and the external power supply detection circuit 9 correspond to the bypass means in the claims. Further, the charging current detection resistor 3 and the current detection circuit 5 correspond to the current detection circuit of the present invention.
  • FIG. 2 is a circuit diagram of charge control device 100 according to the present embodiment.
  • a current detection circuit 5 includes an amplifier 5F composed of resistors 5A and 5B for voltage division, resistors 5C and 5D and an operational amplifier 5E, and an output of the amplifier 5F. It consists of an A / D converter 5G that performs digital conversion. That is, the current detection circuit 3 detects and amplifies the voltage between both ends of the charging current detection resistor 3, and outputs the result as a digitized signal.
  • the charging voltage control circuit 6 includes resistors 6A and 6B for dividing the battery voltage VBATT, a DZA converter 6C for converting the charging voltage control value from the CPU 10 to analog, resistors 6D and 6E, and operational amplification. 6F, a signal output circuit 6G that outputs a signal corresponding to the level difference between the divided battery voltage VBATT and the charging voltage control value from the DZA converter 6C, and resistors 6H, 6K, And a gate voltage adjusting circuit 6M for adjusting the gate voltage of the EFT 4 according to the output level of the signal output circuit 6G. That is, in the charge voltage control circuit 6, the gate voltage of the EFT 4 decreases as the voltage of the battery 1 increases to the charge voltage set by the CPU 10, and finally reaches the set voltage (ie, the termination current). EFT 4 is turned off at that point.
  • the external power supply detection circuit 9 includes resistors 9 A and 9 B for dividing the output voltage of the external power supply 2, a comparator 9 C for comparing the divided external power supply output voltage with the reference voltage VREF, and a comparator 9 C. It is composed of an inverter 9D that inverts the polarity of the C output, and a NOR gate 9E that performs a logical OR operation on the output of the inverter 9D and a control signal (a signal for turning on and off the FET 8) from the CPU 10. Is done. That is, in the external power supply detection circuit 9, When the output voltage of the external power supply 2 falls below the reference voltage VREF and when the CPU 10
  • F E T 8 When a signal to turn on E T 8 is output, F E T 8 is turned on.
  • the case where the FET 8 is turned on by the CPU 10 is, for example, a case where the external power supply 2 is not removed after charging is completed.
  • diodes 11 and 12 for preventing backflow are interposed between the external power supply 2 and the FET 4 and between the external power supply 2 and the external power supply detection circuit 9.
  • the charging current to the battery flows only to the current detection circuit 5, so that the electronic device main body operates during the charging of the battery 1. Even if the charging is performed, the operating current at that time does not flow through the current detection circuit 5, and only the charging current can be always detected. Thus, it is possible to avoid a situation where the full charge voltage varies.
  • both ends of the charging current detection resistor 3 are short-circuited, so that power loss due to the charging current detection resistor 3 can be eliminated, and the battery life can be reduced. Can be avoided.
  • the battery 1 is detected to be attached or detached, and when the battery 1 is removed, the FET 8 is turned on to connect both ends of the charging current detecting resistor 3. You may make it short-circuit.
  • the charging control apparatus 100 of the present embodiment is applicable to all kinds of electronic devices using a rechargeable battery, in addition to communication terminals such as mobile phones and PHSs and base stations.
  • the charging current to the battery flows only through the current detection circuit, so that only the charging current can be always detected, and the load operates during battery charging.
  • the full charge voltage does not vary.
  • the present specification is based on Japanese Patent Application No. 2001-3696728, filed on Jan. 30, 2001. This content is included here.
  • Industrial applicability The present invention is suitable for use in communication terminals such as mobile phones and PHS.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention concerne un régulateur de charge conçu pour que la puissance de sortie soit prélevée entre un résistance de détection de courant de charge (3) et un TEC (4) et que seulement un courant de charge s'écoule à travers un circuit de détection de courant (5). Etant donné qu'un courant de travail ne s'écoule pas à travers le circuit de détection de courant (5) même si l'opération a lieu du côté corps de l'appareil électronique pendant l'opération de charge d'une batterie (1), seul le courant de charge peut être détecté en permanence. Lorsque de l'énergie est fournie seulement par la batterie (1) sans recours à une alimentation externe (2), quelle qu'elle soit, les extrémités opposées de la résistance de détection de courant de charge (3) sont court-circuitées. La perte de puissance dans la résistance de détection de courant de charge (3) peut être ainsi éliminée et la réduction de la durée de vie de la batterie peut être empêchée. En conséquence, seul le courant de charge peut être détecté en permanence dans la régulation de charge de la batterie.
PCT/JP2002/012292 2001-11-30 2002-11-26 Procede de regulation de charge et regulateur de charge WO2003047066A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002365524A AU2002365524A1 (en) 2001-11-30 2002-11-26 Charging control method and charging controller

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001367828A JP2003169425A (ja) 2001-11-30 2001-11-30 充電制御方法及び充電制御装置
JP2001-367828 2001-11-30

Publications (1)

Publication Number Publication Date
WO2003047066A1 true WO2003047066A1 (fr) 2003-06-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/012292 WO2003047066A1 (fr) 2001-11-30 2002-11-26 Procede de regulation de charge et regulateur de charge

Country Status (3)

Country Link
JP (1) JP2003169425A (fr)
AU (1) AU2002365524A1 (fr)
WO (1) WO2003047066A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8872471B2 (en) 2011-10-13 2014-10-28 Ford Global Technologies, Llc Variable output current battery charger and method of operating same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313721A (en) * 1996-05-31 1997-12-03 Fujitsu Ltd Battery charging; backup power supply
JPH11102731A (ja) * 1997-09-25 1999-04-13 Mitsubishi Electric Corp 電池パック

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2313721A (en) * 1996-05-31 1997-12-03 Fujitsu Ltd Battery charging; backup power supply
JPH11102731A (ja) * 1997-09-25 1999-04-13 Mitsubishi Electric Corp 電池パック

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8872471B2 (en) 2011-10-13 2014-10-28 Ford Global Technologies, Llc Variable output current battery charger and method of operating same

Also Published As

Publication number Publication date
JP2003169425A (ja) 2003-06-13
AU2002365524A1 (en) 2003-06-10

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