WO2003047066A1 - Charging control method and charging controller - Google Patents

Charging control method and charging controller 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
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Prior art keywords
charging
power supply
battery
charging current
external power
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PCT/JP2002/012292
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French (fr)
Japanese (ja)
Inventor
Takafumi Hashimoto
Takayuki Tago
Yoji Fujiwara
Koji Abe
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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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/en

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    • 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.

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

Abstract

A charging controller arranged such that the output power is taken out from between a charging current detecting resistor (3) and an FET (4) and only a charging current flows through a current detecting circuit (5). Since a working current does not flow through the current detecting circuit (5) even if operation takes place on the electronic apparatus body side during charging operation of a battery (1), only the charging current can be detected at all times. When power is supplied only through the battery (1) without using any external power supply (2), opposite ends of the charging current detecting resistor (3) are short-circuited. Power loss through the charging current detecting resistor (3) can thereby be eliminated and shortening of battery life can be avoided. Consequently, only the charging current can be detected at all times in the charging control of the battery.

Description

明 細 書 充電制御方法及び充電制御装置 技術分野  Description Charge control method and charge control device
本発明は、携帯電話機や P H S等の通信端末に用いて好適な充電制御方法及 び充電制御装置に関する。 背景技術  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. Background art
図 1は従来の充電制御装置の構成を示すブロック図である。  FIG. 1 is a block diagram showing a configuration of a conventional charge control device.
この図に示す従来の充電制御装置 5 0は、 ノ、ヅテリ 1と外部電源 2との間の 充放電経路上に介挿された充電電流検出用抵抗 3と、 充電電流検出用抵抗 3と 外部電源 2との間の充放電経路上に介挿された充電電圧制御用の F E T 4と、 充電電流検出用抵抗 3の両端間電圧に基づいて充電電流を検出する電流検出 回路 5と、 電流検出回路 5の検出出力に基づいて充電電圧を検出し、 満充電に 達した時点で F E T 4をオフする充電電圧制御回路 6と、 バヅテリ 1と充鼋電 流検出用抵抗 3との間より出力電力を取り出すための電力出力端子 7と、 から 構成される。  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 And a power output terminal 7 for extracting the
この構成において、 バッテリ 1に供給する充電電流を充電電流検出用抵抗 3 の両端間電圧によって検出し、検出した充電電流が徐々に低下して行って所定 の終止電流になった時点即ちバッテリ 1が満充電になった時点で F E T 4を オフする。本装置の出力電力の取り出しは、 上述したようにバッテリ 1と充電 電流検出用抵抗 3との間から行われる。 なお、 本装置では、 満充電時において F E T をオフする関係から、 電流検出回路 5及び充電電圧制御回路 6の動作 電圧をバッテリ 1から得るようにしている。  In this configuration, 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. In this device, 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.
しかしながら、 従来の充電制御装置においては、 次のような問題がある。 すなわち、 出力電力の取り出しをバッテリ 1と充電電流検出用抵抗 3との間 から行うようにしているため、 バヅテリ 1の充電中に電子機器本体側で動作が 行われた場合、 例えば携帯電話機が送信状態になったり、 表示部や操作部を点 灯した場合に、 その動作電流が流れて （図 2参照） 純粋な充電電流を検出する ことができなくなり、 満充電電圧のばらつきが生じてしまう。 発明の開示 However, 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
本発明の目的は、 バッテリの充電制御において、 常に充電電流のみ検出する ことができる充電制御方法及び充電制御装置を提供することである。  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.
この目的は、 外部電源から電力の供給を受けるバッテリへの充電電流の検出 結果を基にバッテリへの充電電流を制御する充電制御装置において、 充電電流 を検出する回路に充電電流のみ流れるようにすることで、 ノ ッテリ充電時に負 荷が動作しても充電電流のみの検出を可能とすることにより達成できる。 図面の簡単な説明  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. BRIEF DESCRIPTION OF THE FIGURES
図 1は、 従来の充電制御装置の構成を示すブロック図、  FIG. 1 is a block diagram showing a configuration of a conventional charge control device,
図 2は、 従来の充電制御装置の問題点を説明するための図  Fig. 2 is a diagram for explaining the problems of the conventional charge control device.
図 3は、 本発明の実施の形態に係る充電制御装置の構成を示すプロック図、 及び  FIG. 3 is a block diagram showing a configuration of the charging control device according to the embodiment of the present invention, and
図 4は、 本発明の実施の形態に係る充電制御装置の回路構成を示す図である。 発明を実施するための最良の形態  FIG. 4 is a diagram showing a circuit configuration of the charge control device according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
以下、 本発明の実施の形態について、 図面を参照して詳細に説明する。  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
図 3は、 本発明の実施の形態に係る充電制御装置の構成を示すプロック図で ある。 なお、 この図において前述した図 1と共通する部分には同一の符号を付 けている。  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.
この図において、 本実施の形態の充電制御装置 1 0 0は、 バヅテリ 1と外部 電源 2との間の充放電経路上に介挿された充電電流検出用抵抗 3と、 充電電流 検出用抵抗 3と外部電源 2との間の充放電経路上に介挿された充電電圧制御 用の F E T 4と、 充電電流検出用抵抗 3の両端間電圧に基づいてバヅテリ 1に 流入する充電電流を検出する電流検出回路 5と、 電流検出回路 5で検出された 充電電流に基づいて外部電源 2からの電力供給を制御する充電電圧制御回路 6と、 充電電流検出用抵抗 3と充電電圧制御回路 6との間より出力電力を取り 出すための電力出力端子 7と、 充電電流検出用抵抗 3の両端間に介揷されたバ ィパス用の F E T 8と、 外部電源 2の出力を判定し、 電力供給が途絶えると F E T 8をオンして充電電流検出用抵抗 3の両端間を短絡し、 外部電源 2からの 電力供給が復旧すると短絡を解除する外部電源検出回路 9と、 を具備して構成 される。 In this figure, a charge control device 100 according to the present embodiment 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. Current detection circuit 5, a charge voltage control circuit 6 for controlling power supply from an external power supply 2 based on the charge current detected by the current detection circuit 5, a charge current detection resistor 3, and a charge voltage control circuit. 6 to determine the output of the external power supply 2 and the power output terminal 7 for taking out the output power from the output power supply 7, the bypass FET 8 inserted between both ends of the charging current detection resistor 3, An external power supply detection circuit 9 that turns on the FET 8 when supply is interrupted, short-circuits both ends of the charging current detection resistor 3, and releases the short-circuit when power supply from the external power supply 2 is restored. You.
この構成において、 バッテリ 1に供給する充電電流を充電電流検出用抵抗 3 の両端間電圧によつて検出し、 検出した充電電流が徐々に低下して行って所定 の終止電流になつた時点即ちバッテリ 1が満充電電圧になつた時点で F E T 4をオフする。 本装置の出力電力の取り出しは、 従来の充電制御装置 3 0 0と 違い、 充電電流検出用抵抗 3と F E T 4との間 （即ち、 充電電流検出用抵抗 3 から外部電源 2までの充放電経路上） から行われる。 出力電力の取り出しをこ のようにすることで、 バッテリ 1の充電中に電子機器本体側で動作が行われた 場合でも、 そのときの動作電流が電流検出回路 5を流れることがないので、 常 に充電電流のみ検出することができ、 満充電電圧がばらつくような事態を回避 することができる。  In this configuration, 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. Unlike the conventional charge control device 300, 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). By taking out the output power in this way, even if the electronic device itself operates while the battery 1 is being charged, the operating current at that time does not flow through the current detection circuit 5, so that Only the charging current can be detected at a time, and the situation where the full charging voltage varies can be avoided.
また、 本装置によれば、 外部電源 2からの電力供給が途絶えると F E T 8を オンして充電電流検出用抵抗 3の両端間を短絡させ、 外部電源 2からの電力供 給が復旧すると短絡を解除するので、 外部電源 2を使用せずバッテリ 1のみに よる電力供給時において、 充電電流検出用抵抗 3による電力損失を無くすこと ができ、 バヅテリ寿命の減少を回避することができる。  Further, according to this device, 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.
なお、 本装置でも従来の充電制御装置 3 0 0と同様に、 満充電時において F E T 4をオフする関係から、 電流検出回路 5及び充電電圧制御回路 6の動作電 圧をバッテリ 1から得るようにしている。 In this device, as in the conventional charge control device 300, 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.
また、 上記 F ET8と外部電源検出回路 9は請求項のバイパス手段に対応す る。 また、 充電電流検出用抵抗 3と電流検出回路 5は請求項の電流検出回路に 対応する。  Further, 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.
次に、 本実施の形態に係る充電制御装置 100の詳細な構成について説明す o  Next, a detailed configuration of the charge control device 100 according to the present embodiment will be described.
図 2は本実施の形態に係る充電制御装置 100の回路図である。 この図にお いて、 電流検出回路 5は、 分圧用の抵抗 5 A、 5Bと、 抵抗 5C、 5D及び演 算増幅器 5 Eで構成された増幅回路 5 Fと、 この増幅回路 5 Fの出力をディジ タル変換する A/Dコンバータ 5 Gとから構成される。 すなわち、 この電流検 出回路 3では、 充電電流検出用抵抗 3の両端間電圧を検出して増幅し、 その結 果をディジ夕ル出力する。  FIG. 2 is a circuit diagram of charge control device 100 according to the present embodiment. In this figure, 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.
充電電圧制御回路 6は、バヅテリ電圧 VBATTを分圧する抵抗 6 A、 6 Bと、 CPU 10からの充電電圧制御値をアナログ変換する DZAコンパ'一夕 6 C と、 抵抗 6D、 6 E及び演算増幅 6 Fで構成され、 分圧されたバヅテリ電圧 V BATTと DZAコンバータ 6 Cからの充電電圧制御値とのレベル差に応じた信 号を出力する信号出力回路 6 Gと、 抵抗 6 H、 6K、 6Μ及びトランジスタ 6 Jで構成され、 信号出力回路 6 Gの出力レベルに応じて E F T 4のゲ一ト電圧 を調整するゲート電圧調整回路 6Mとから構成される。 すなわち、 充電電圧制 御回路 6では、 CPU10で設定された充電電圧にバヅテリ 1の電圧が上昇し て行くに従って EFT 4のゲート電圧を下げて行き、 最終的に設定電圧 （即ち 終止電流） になった時点で EFT 4をオフする。  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.
外部電源検出回路 9は、外部電源 2の出力電圧を分圧する抵抗 9 A、 9 Bと、 分圧された外部電源出力電圧と基準電圧 VREFとを比較する比較器 9 Cと、比 較器 9 Cの出力を極性反転するインバ一夕 9 Dと、 インバ一夕 9 Dの出力と C PU10からの制御信号 （FET 8をオンオフさせる信号） との否定的論理和 をとるノァゲート 9 Eとから構成される。すなわち、外部電源検出回路 9では、 外部電源 2の出力電圧が基準電圧 VREFを下回つた場合と、 C P U 1 0から FThe 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
E T 8をオンする信号が出力された場合に F E T 8をオンする。 C P U 1 0に て F E T 8をオンする場合とは、 例えば充電完了後、 外部電源 2を外されてい ない場合などである。 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.
なお、 外部電源 2と F E T 4との間及び外部電源 2と外部電源検出回路 9と の間には逆流防止用のダイオード 1 1、 1 2が介挿されている。  Note that 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.
このように、 本実施の形態の充電制御装置 1 0 0によれば、 バッテリへの充 電電流が電流検出回路 5にのみ流れるようにしたので、 バッテリ 1の充電中に 電子機器本体側で動作が行われた場合でも、 そのときの動作電流が電流検出回 路 5を流れることがなく常に充電電流のみ検出することができる。 これにより、 満充電電圧がばらつくような事態を回避することができる。  As described above, according to the charging control device 100 of the present embodiment, 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.
また、 外部電源 2を使用せずバッテリ 1のみによる電力供給時において、 充 電電流検出用抵抗 3の両端間を短絡させるので、 充電電流検出用抵抗 3による 電力損失を無くすことができ、 バッテリ寿命の減少を回避することができる。 なお、 本実施の形態の充電制御装置 1 0 0において、 バヅテリ 1の脱着を検 出するようにして、 バヅテリ 1が取り外された時に F E T 8をオンして充電電 流検出用抵抗 3の両端を短絡させるようにしても良い。  In addition, when power is supplied only from the battery 1 without using the external power supply 2, 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. In the charging control apparatus 100 of the present embodiment, 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.
また、 本実施の形態の充電制御装置 1 0 0は、 携帯電話機や P H S等の通信 端末や基地局の他に、 充電式のバヅテリを使用する各種電子機器の全てに適用 可能である。  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.
以上説明したように、 本発明によれば、 バッテリへの充電電流が電流検出回 路にのみ流れるようにしたので、 常に充電電流のみ検出することができ、 バヅ テリ充電中に負荷が動作しても満充電電圧がばらつくようなことがない。  As described above, according to the present invention, 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. However, the full charge voltage does not vary.
本明細書は、 2 0 0 1年 1 1月 3 0日出願の特願 2 0 0 1—3 6 7 8 2 8に 基づくものである。 この内容をここに含めておく。 産業上の利用可能性 本発明は、 携帯電話機や P H S等の通信端末に用いるに好適である。 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.

Claims

請求の範囲 The scope of the claims
1 . 外部電源から電力の供給を受けるバッテリへの充電電流の検出結果を基に 前記バッテリへの充電電流を制御する充電制御方法であって、 充電電流を検出 する回路に充電電流のみ流れるようにした充電制御方法。  1. A charging control method for controlling a charging current to a battery based on a detection result of a charging current to a battery which receives power supply from an external power supply, wherein only a charging current flows to a circuit for detecting a charging current. Charge control method.
2 . 前記外部電源からの電力供給が途絶えると前記充電電流を検出する回路を 回路本体から外し、 前記外部電源からの電力供給が復旧すると戻す請求の範囲 1に記載の充電制御方法。 2. The charging control method according to claim 1, wherein a circuit for detecting the charging current is disconnected from a circuit main body when the power supply from the external power supply is interrupted, and is returned when the power supply from the external power supply is restored.
3 . 外部電源と、 前記外部電源から電力の供給を受けるバッテリと、 前記バヅ テリへの充電電流を検出する電流検出回路と、 前記電流検出回路の検出結果を 基に前記バッテリへの充電電流を制御する充電電圧制御回路とを具備し、 前記 電流検出回路に充電電流のみ流れるようにした充電制御装置。  3. An external power supply, a battery supplied with power from the external power supply, a current detection circuit for detecting a charging current to the battery, and a charging current to the battery based on a detection result of the current detection circuit And a charging voltage control circuit for controlling the current detection circuit, wherein only the charging current flows through the current detection circuit.
4 . 前記外部電源からの電力供給の有無を検出し、 前記外部電源からの電力供 給が途絶えたことを検出すると前記バッテリからの出力電流が前記電流検出 回路を通過しないようにバイパスさせ、 前記外部電源からの電力供給が復旧し たことを検出するとバイパスを解除するバイパス手段を具備する請求の範囲 3に記載の充電制御装置。  4. Detecting the presence or absence of power supply from the external power supply, and when detecting that the power supply from the external power supply is interrupted, bypasses the output current from the battery so as not to pass through the current detection circuit; 4. The charge control device according to claim 3, further comprising a bypass unit configured to release the bypass when detecting that the power supply from the external power supply has been restored.
5 . 充電制御装置を具備する通信端末であって、 前記充電制御装置は、 外部電 源と、 前記外部電源から電力の供給を受けるバッテリと、 前記バッテリへの充 電電流を検出する電流検出回路と、 前記電流検出回路の検出結果を基に前記バ ッテリへの充電電流を制御する充電電圧制御回路とを具備し、 前記電流検出回 路に充電電流のみ流れるようにした。  5. A communication terminal including a charge control device, wherein the charge control device includes: an external power source; a battery receiving power supply from the external power source; and a current detection circuit detecting a charging current to the battery. And a charging voltage control circuit for controlling a charging current to the battery based on a detection result of the current detection circuit, wherein only the charging current flows through the current detection circuit.
PCT/JP2002/012292 2001-11-30 2002-11-26 Charging control method and charging controller WO2003047066A1 (en)

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US8872471B2 (en) 2011-10-13 2014-10-28 Ford Global Technologies, Llc Variable output current battery charger and method of operating same

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GB2313721A (en) * 1996-05-31 1997-12-03 Fujitsu Ltd Battery charging; backup power supply
JPH11102731A (en) * 1997-09-25 1999-04-13 Mitsubishi Electric Corp Battery pack

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Publication number Priority date Publication date Assignee Title
GB2313721A (en) * 1996-05-31 1997-12-03 Fujitsu Ltd Battery charging; backup power supply
JPH11102731A (en) * 1997-09-25 1999-04-13 Mitsubishi Electric Corp Battery pack

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* 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

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