JP4144336B2 - Mobile phone and charging method used therefor - Google Patents

Mobile phone and charging method used therefor Download PDF

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JP4144336B2
JP4144336B2 JP2002335907A JP2002335907A JP4144336B2 JP 4144336 B2 JP4144336 B2 JP 4144336B2 JP 2002335907 A JP2002335907 A JP 2002335907A JP 2002335907 A JP2002335907 A JP 2002335907A JP 4144336 B2 JP4144336 B2 JP 4144336B2
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charging
battery
mobile phone
constant voltage
current
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JP2004173408A (en
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秀夫 並木
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NEC Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Description

【０００１】
【発明の属する技術分野】
本発明は携帯電話機及びそれに用いる充電方法に関し、特に携帯電話機に用いられる電池の充電方法に関する。
【０００２】
【従来の技術】
従来、携帯電話機においては、図４に示すように、携帯電話の通信を行う携帯電話回路（通信回路）４１と、充電動作を行う充電制御回路４２と、定電流充電を行うための定電流源４３と、定電圧充電を行うための定電圧源４４と、定電流充電と定電圧充電とを切替えるためのスイッチ４５と、充電電流及び電圧を検出するための電流電圧検出回路４６と、ダイオード４７とから構成され、充電器２及び電池３に接続されている。
【０００３】
この携帯電話機４における正常動作時に充電を行う際の電池電圧と充電電流との関係を図５に示し、充電完了直前に通信状態になった場合の電池電圧と充電電流との関係を図６に示す。
【０００４】
一般に、携帯電話機４の充電器２では、初期充電として低電流Ａ０（Ａ）にて定電流充電を開始し、電圧がＶ０（Ｖ）からＶ１（Ｖ）に上昇することを確認し、Ｖ３（Ｖ）での定電圧充電へ移行する。
【０００５】
上記の携帯電話機に用いられる電池の充電方法としては、卓上充電器を使用することで、外部インタフェースを使用したデータ通信を行いながらの充電を可能とする方法（例えば、特許文献１参照）、充電中に受信動作を頻繁に行い、非充電中には電力が供給されていないので、消費電流を低減するために、受信処理の頻度を下げる方法（例えば、特許文献２参照）、充電中に着信があった場合に、充電器から携帯電話を外すと着信応答する方法（例えば、特許文献３参照）、充電中に消費電流の多い動作をした時に充電完了しないうちにタイムアウトしないように、過充電防止タイマを停止させて、タイムアウトしないように制御し、消費電流が多い場合に充電を継続しつづける方法（例えば、特許文献４参照）、二次電池パックと接続され、二次電池を充電する充電器において、二次電池パックに充電電流たる定電流を供給する定電流発生回路と、二次電池パックに定電圧を供給する定電圧発生回路と、定電流発生回路と定電圧発生回路とを切替える切替手段と、二次電池パックの電圧を検出する電圧検出回路とを有する充電器（例えば、特許文献５参照）等がある。
【０００６】
【特許文献１】
特開平８−１３０７７３号公報（第３〜５頁、図１，２）
【特許文献２】
特開平８−１８１７５０号公報（第２，３頁、図１）
【特許文献３】
特開平８−２０４７９０号公報（第３，４頁、図１）
【特許文献４】
特開平１１−２５２８１３号公報（第３〜５頁、図１）
【特許文献５】
特開平８−３２９９９２号公報（請求項第３項）
【０００７】
【発明が解決しようとする課題】
上述した従来の携帯電話機に用いられる電池の充電方法では、図５に示すように、Ｖ３（ｖ）での定電圧充電中に充電電流量が減少し、Ａ２（Ａ）以下になったことによって充電完了かどうかを判定している。
【０００８】
しかしながら、従来の携帯電話機では、通信中における消費電流が非通信中の消費電流に対して極めて多く、非通信中に検出可能であった充電電流量のＡ２（Ａ）を検出することが非常に困難である。
【０００９】
この場合には、図６に示すのように、充電電流がＡ２（Ａ）になることなく、Ａ３（Ａ）で収束してしまうため、充電が完了せずに継続され、充電電圧Ｖ２（Ｖ）を印加し続けてしまう。結果として、従来の携帯電話機では、電池に対して負荷をかけることになり、電池の老朽化を加速してしまうという問題がある。この問題は上記の特許文献１〜４の技術では解決することができない。
【００１０】
そこで、本発明の目的は上記の問題点を解消し、正しく充電動作を検出することができ、電池への過充電という負荷を低減しかつ電池からの電力消費をなくして通信を継続することができる携帯電話機及びそれに用いる充電方法を提供することにある。
【００１１】
【課題を解決するための手段】
本発明による携帯電話機は、通信を行うための携帯電話回路の電源に用いる電池を充電器で充電可能な携帯電話機であって、
前記充電器から前記電池への定電流充電を行うための定電流源と、前記充電器から前記電池への定電圧充電を行うための定電圧源と、前記定電流源と前記定電圧源とを切替えて前記電池に接続する第１の切替手段と、前記定電圧源と前記電池とを切替えて前記携帯電話回路に接続する第２の切替手段と、前記携帯電話回路からの通信開始の通知の有無に基づいて前記第１及び第２の切替手段を制御して前記電池の充電動作と前記携帯電話回路への電力供給動作とを分けて行うように制御する制御手段とを備え、
前記制御手段は、充電開始時に前記第１の切替手段を前記定電流源側に切替えて定電流での充電を実施し、前記電池の電圧が所定電圧に上昇した時に前記第１の切替手段を前記定電圧源側に切替えて定電圧での充電に切替えるとともに、前記定電圧にて充電中に充電電流が所定電流以下になった時に充電完了として前記第１の切替手段をＯＦＦ設定にし、前記定電圧での充電中に前記通信開始の通知がきた時に前記第２の切替手段を前記電池側から前記定電圧源側に切替えて前記定電圧源側から前記携帯電話回路への電力供給を行っている。
【００１２】
本発明による充電方法は、通信を行うための携帯電話回路の電源に用いる電池を充電器で充電可能な携帯電話機に用いる充電方法であって、
前記携帯電話機が、前記電池への定電流充電を行うための定電流源と、前記電池への定電圧充電を行うための定電圧源とを第１の切替手段で切替えて前記電池に接続する第１のステップと、第２の切替手段で前記定電圧源と前記電池とを切替えて前記携帯電話回路に接続する第２のステップと、前記電池の電流電圧を検出する第３のステップと、その検出結果と前記携帯電話回路からの通信開始の通知の有無とに応じて前記第１及び第２の切替手段を制御して前記電池の充電動作と前記携帯電話回路への電力供給動作とを分けて行うように制御する第４のステップとを実行し、
前記携帯電話機が、充電開始時に前記第１の切替手段を前記定電流源側に切替えて定電流での充電を実施し、前記電池の電圧が所定電圧に上昇した時に前記第１の切替手段を前記定電圧源側に切替えて定電圧での充電に切替えるとともに、前記定電圧にて充電中に充電電流が所定電流以下になった時に充電完了として前記第１の切替手段をＯＦＦ設定にし、前記定電圧での充電中に前記通信開始の通知がきた時に前記第２の切替手段を前記電池側から前記定電圧源側に切替えて前記定電圧源側から前記携帯電話回路への電力供給を行っている。
【００１３】
すなわち、本発明の携帯電話機の充電方法は、充電中に通信状態に移行した場合に電池から外部電源に電力供給源を切替えることで、装置の通信状態を保証しながら、正しい充電完了を検出し、充電を完了させることによって、電池の負荷を低減することが可能となる。
【００１４】
上記のように、本発明の携帯電話機の充電方法では、通信中に電力源を切替えることで、電池への充電動作を正常に行いながら、外部の充電器からの電力を直接使用することで、正しく充電動作を検出でき、電池への過充電という負荷を低減し、電池からの電力消費をなくして通信を継続することが可能となる。
【００１５】
【発明の実施の形態】
次に、本発明の実施例について図面を参照して説明する。図１は本発明の一実施例による携帯電話機の構成を示すブロック図である。図１において、携帯電話機１は携帯電話機としての携帯電話回路（通信回路）１１と、充電回路（図中において１２〜１９の各素子を含む）とからなり、充電器２及び電池３に接続されている。
【００１６】
充電回路は充電動作を行う充電制御回路１２と、定電流充電を行うための定電流源１３と、定電圧充電を行うための定電圧源１４と、定電流充電と定電圧充電とを切り替えるためのスイッチ１５と、充電電流及び電圧を検出するための電流電圧検出回路１６と、ダイオード１７，１９と、携帯電話回路１１への電力供給を電池３からの供給か、定電圧源１４からの供給かを切替えるためのスイッチ１８とから構成されている。
【００１７】
充電制御回路１２は電流電圧検出回路１６の検出結果及び携帯電話回路１１からの通信／非通信の情報を入力し、これらの情報に基づいてスイッチ１５，１８及び定電流源１３を制御する。
【００１８】
図２は本発明の一実施例による充電回路の動作時の電流と電圧との関係を示す図であり、図３は図１の充電制御回路１２による制御動作を示すフローチャートである。これら図１〜図３を参照して本発明の一実施例による充電回路の動作について説明する。
【００１９】
充電制御回路１２は電流電圧検出回路１６の検出結果を基にスイッチ１５及び定電流源１３の電流値を制御することで、図２に示すように、定電流充電と定電圧充電及び充電完了の検出を行う。
【００２０】
充電制御回路１２は充電開始時に（図３ステップＳ１）、スイッチ１５を定電流源側に切替え、Ａ０（Ａ）の定電流での充電を実施する（図３ステップＳ２）。充電制御回路１２は初期充電によって電池電圧がＶ０（Ｖ）からＶ１（Ｖ）に上昇したことを検出すると（図３ステップＳ３）、スイッチ１５を定電圧源側に切替え、定電圧Ｖ３（Ｖ）での定電圧充電に切替える（図３ステップＳ４）。
【００２１】
充電制御回路１２は定電圧にて充電中に電流電圧回路が充電電流がＡ２（Ａ）以下になった時に（図３ステップＳ７）、充電完了としてスイッチ１５をＯＦＦ設定にする（図３ステップＳ８）。
【００２２】
一方、充電制御回路１２は充電動作中に携帯電話回路１１から通信開始の通知がくると（図３ステップＳ５）、スイッチ１８を電池３側から定電圧源１４側に切替える（図３ステップＳ６）。
【００２３】
これによって、携帯電話回路１１の電力消費は電池３からではなく、定電圧源１４側に切替えられ、電池３の充電状態（電流及び電圧）には変化なく、例えば時刻Ｔ３で通信が開始されても、電流電圧検出回路１６で充電電流がＡ２（Ａ）以下になったことも検出することが可能になる。
【００２４】
このように、本実施例では、通信中に電力源を切替えることで、電池３への充電動作を正常に行いながら、外部の充電器２のからの電力を直接使用することで、正しく充電動作を検出することができ、電池３への過充電という負荷を低減し、電池３からの電力消費をなくして通信を継続することが可能となる。
【００２５】
尚、本実施例ではスイッチ１８を用いて通信中の電力源として、充電器２からの入力を定電圧源１４を介して使用しているが、定電圧源出力に切替えることなく、電池３を電力供給源として継続使用し、スイッチ１５を切替えることで、通信状態に入った場合に充電動作を停止する制御のみを行うことも可能である。この場合には、電池３への充電が停止しているため、通信中に電池電力を消費することになる。
【００２６】
【発明の効果】
以上説明したように本発明は、自端末の電源に用いる電池を充電器で充電可能な携帯電話機において、電池の電流電圧を検出し、その検出結果に応じて電池の充電動作と携帯電話機への電力供給動作とを分けて行うように制御することによって、正しく充電動作を検出することができ、電池への過充電という負荷を低減しかつ電池からの電力消費をなくして通信を継続することができるという効果が得られる。
【図面の簡単な説明】
【図１】本発明の一実施例による携帯電話機の構成を示すブロック図である。
【図２】本発明の一実施例による充電回路の動作時の電流と電圧との関係を示す図である。
【図３】図１の充電制御回路による制御動作を示すフローチャートである。
【図４】従来の携帯電話機の構成を示すブロック図である。
【図５】充電完了時の電池電圧と充電電流との関係を示す図である。
【図６】充電完了直前に通信動作になった場合の電池電圧と充電電流との関係を示す図である。
【符号の説明】
１ 携帯電話機
２ 充電器
３ 電池
１１ 携帯電話回路
１２ 充電制御回路
１３ 定電流源
１４ 定電圧源
１５，１８ スイッチ
１６ 電流電圧検出回路
１７，１９ ダイオード[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile phone and a charging method used therefor, and more particularly, to a battery charging method used in a mobile phone.
[0002]
[Prior art]
Conventionally, in a mobile phone, as shown in FIG. 4, a mobile phone circuit (communication circuit) 41 that performs communication with a mobile phone, a charge control circuit 42 that performs a charging operation, and a constant current source that performs constant current charging 43, a constant voltage source 44 for performing constant voltage charging, a switch 45 for switching between constant current charging and constant voltage charging, a current voltage detecting circuit 46 for detecting charging current and voltage, and a diode 47 And is connected to the charger 2 and the battery 3.
[0003]
FIG. 5 shows the relationship between the battery voltage and the charging current when charging the mobile phone 4 during normal operation, and FIG. 6 shows the relationship between the battery voltage and the charging current when the mobile phone 4 is in a communication state immediately before the completion of charging. Show.
[0004]
In general, the charger 2 of the mobile phone 4 starts constant current charging at a low current A0 (A) as initial charging, confirms that the voltage rises from V0 (V) to V1 (V), and V3 ( Transition to constant voltage charging at V).
[0005]
As a method of charging a battery used in the above mobile phone, a method that enables charging while performing data communication using an external interface by using a desktop charger (for example, see Patent Document 1), charging Since reception is frequently performed and power is not supplied during non-charging, a method of reducing the frequency of reception processing to reduce current consumption (see, for example, Patent Document 2), incoming during charging If the mobile phone is disconnected from the charger, the incoming call response method (see, for example, Patent Document 3), overcharge so as not to time out before charging is completed when an operation with a large current consumption is performed during charging. The prevention timer is stopped and controlled so as not to time out, and the charging is continued when the current consumption is large (see, for example, Patent Document 4 ) , connected to the secondary battery pack. In a charger for charging a secondary battery, a constant current generating circuit for supplying a constant current as a charging current to the secondary battery pack, a constant voltage generating circuit for supplying a constant voltage to the secondary battery pack, and a constant current generation There is a charger (for example, refer to Patent Document 5) having switching means for switching between a circuit and a constant voltage generation circuit and a voltage detection circuit for detecting the voltage of the secondary battery pack .
[0006]
[Patent Document 1]
JP-A-8-130773 (pages 3 to 5, FIGS. 1 and 2)
[Patent Document 2]
JP-A-8-181750 (pages 2, 3 and 1)
[Patent Document 3]
JP-A-8-204790 (pages 3 and 4, FIG. 1)
[Patent Document 4]
Japanese Patent Laid-Open No. 11-252813 (pages 3 to 5, FIG. 1)
[Patent Document 5]
JP-A-8-329992 (Claim 3)
[0007]
[Problems to be solved by the invention]
In the battery charging method used in the above-described conventional mobile phone, as shown in FIG. 5, the amount of charging current is reduced during constant voltage charging at V3 (v), and is below A2 (A). Judging whether charging is complete.
[0008]
However, in the conventional mobile phone, the current consumption during communication is extremely large compared to the current consumption during non-communication, and it is extremely possible to detect the charge current amount A2 (A) that could be detected during non-communication. Have difficulty.
[0009]
In this case, as shown in FIG. 6, the charging current does not become A2 (A) but converges at A3 (A), so that the charging is continued without being completed, and the charging voltage V2 (V ) Will continue to be applied. As a result, the conventional mobile phone places a load on the battery, and there is a problem that the aging of the battery is accelerated. This problem cannot be solved by the techniques of Patent Documents 1 to 4 described above.
[0010]
Therefore, the object of the present invention is to solve the above-mentioned problems, to correctly detect the charging operation, to reduce the load of overcharging the battery, and to continue communication without power consumption from the battery. It is an object of the present invention to provide a portable telephone and a charging method used therefor.
[0011]
[Means for Solving the Problems]
A mobile phone according to the present invention is a mobile phone capable of charging a battery used as a power source of a mobile phone circuit for communication with a charger,
A constant current source for performing constant current charging from the charger to the battery; a constant voltage source for performing constant voltage charging from the charger to the battery; the constant current source and the constant voltage source; A first switching means for switching the battery and connecting to the battery; a second switching means for switching the constant voltage source and the battery to connect to the mobile phone circuit; and a communication start notification from the mobile phone circuit Control means for controlling the first and second switching means on the basis of the presence or absence of the battery so as to separately perform the charging operation of the battery and the power supply operation to the mobile phone circuit ,
The control means switches the first switching means to the constant current source side at the start of charging, performs charging with a constant current, and turns the first switching means on when the voltage of the battery rises to a predetermined voltage. Switch to the constant voltage source side to switch to charging at a constant voltage, and when the charging current becomes equal to or less than a predetermined current during charging at the constant voltage, the first switching means is set to OFF as charging completion, When the communication start notification is received during charging at a constant voltage, the second switching means is switched from the battery side to the constant voltage source side to supply power from the constant voltage source side to the mobile phone circuit. ing.
[0012]
A charging method according to the present invention is a charging method used for a mobile phone capable of charging a battery used for a power source of a mobile phone circuit for communication with a charger,
The mobile phone is connected to the battery by switching a constant current source for performing constant current charging to the battery and a constant voltage source for performing constant voltage charging to the battery by a first switching means. A first step, a second step of switching between the constant voltage source and the battery by a second switching means and connecting to the mobile phone circuit; a third step of detecting a current voltage of the battery; Depending on the detection result and the presence or absence of communication start notification from the mobile phone circuit, the first and second switching means are controlled to perform the battery charging operation and the power supply operation to the mobile phone circuit. And a fourth step of controlling to be performed separately ,
When the mobile phone starts charging, the first switching means is switched to the constant current source side to perform charging with a constant current, and when the battery voltage rises to a predetermined voltage, the first switching means is Switch to the constant voltage source side to switch to charging at a constant voltage, and when the charging current becomes equal to or less than a predetermined current during charging at the constant voltage, the first switching means is set to OFF as charging completion, When the communication start notification is received during charging at a constant voltage, the second switching means is switched from the battery side to the constant voltage source side to supply power from the constant voltage source side to the mobile phone circuit. ing.
[0013]
In other words, the mobile phone charging method of the present invention detects the correct charging completion while guaranteeing the communication state of the device by switching the power supply source from the battery to the external power source when the communication state is changed during charging. By completing the charging, the load on the battery can be reduced.
[0014]
As described above, in the method for charging the mobile phone of the present invention, by switching the power source during communication, while normally performing the charging operation to the battery, directly using the power from the external charger, The charging operation can be detected correctly, the load of overcharging the battery can be reduced, and the communication can be continued without consuming power from the battery.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a mobile phone according to an embodiment of the present invention. In FIG. 1, a mobile phone 1 includes a mobile phone circuit (communication circuit) 11 as a mobile phone and a charging circuit (including elements 12 to 19 in the figure), and is connected to a charger 2 and a battery 3. ing.
[0016]
The charging circuit switches between constant current charging and constant voltage charging, a charging control circuit 12 for performing charging operation, a constant current source 13 for performing constant current charging, a constant voltage source 14 for performing constant voltage charging, and the like. Switch 15, current / voltage detection circuit 16 for detecting charging current and voltage, diodes 17 and 19, and power supply to mobile phone circuit 11 are supplied from battery 3 or supplied from constant voltage source 14. And a switch 18 for switching between them.
[0017]
The charge control circuit 12 inputs the detection result of the current / voltage detection circuit 16 and the communication / non-communication information from the mobile phone circuit 11 and controls the switches 15 and 18 and the constant current source 13 based on the information.
[0018]
FIG. 2 is a diagram showing the relationship between current and voltage during operation of the charging circuit according to one embodiment of the present invention, and FIG. 3 is a flowchart showing the control operation by the charging control circuit 12 of FIG. The operation of the charging circuit according to one embodiment of the present invention will be described with reference to FIGS.
[0019]
The charge control circuit 12 controls the current values of the switch 15 and the constant current source 13 based on the detection result of the current / voltage detection circuit 16, so that the constant current charging, the constant voltage charging and the charging completion are performed as shown in FIG. Perform detection.
[0020]
At the start of charging (step S1 in FIG. 3), the charging control circuit 12 switches the switch 15 to the constant current source side and performs charging with a constant current of A0 (A) (step S2 in FIG. 3). When the charge control circuit 12 detects that the battery voltage has increased from V0 (V) to V1 (V) due to initial charging (step S3 in FIG. 3), the switch 15 is switched to the constant voltage source side, and the constant voltage V3 (V). Switching to constant voltage charging at (step S4 in FIG. 3).
[0021]
The charging control circuit 12 sets the switch 15 to OFF when charging is completed (step S7 in FIG. 3) when the charging current becomes A2 (A) or less during charging at a constant voltage (step S7 in FIG. 3). ).
[0022]
On the other hand, the charging control circuit 12 switches the switch 18 from the battery 3 side to the constant voltage source 14 side (step S6 in FIG. 3) when a communication start notification is received from the mobile phone circuit 11 during the charging operation (step S5 in FIG. 3). .
[0023]
As a result, the power consumption of the mobile phone circuit 11 is switched from the battery 3 to the constant voltage source 14 side, and the state of charge (current and voltage) of the battery 3 does not change. For example, communication is started at time T3. In addition, the current / voltage detection circuit 16 can also detect that the charging current has become A2 (A) or less.
[0024]
As described above, in this embodiment, the power source is switched during communication, so that the charging operation to the battery 3 is normally performed, and the power from the external charger 2 is directly used to correctly perform the charging operation. Can be detected, the load of overcharging the battery 3 can be reduced, and power consumption from the battery 3 can be eliminated to continue communication.
[0025]
In the present embodiment, the input from the charger 2 is used via the constant voltage source 14 as a power source during communication using the switch 18, but the battery 3 is switched without switching to the constant voltage source output. By continuously using the power supply source and switching the switch 15, it is possible to perform only the control for stopping the charging operation when the communication state is entered. In this case, since charging of the battery 3 is stopped, battery power is consumed during communication.
[0026]
【The invention's effect】
As described above, the present invention detects a battery current voltage in a mobile phone capable of charging a battery used as a power source of the terminal with a charger, and charges the battery according to the detection result. By controlling the power supply operation so as to be performed separately, it is possible to correctly detect the charge operation, reduce the load of overcharging the battery, and continue the communication without consuming power from the battery. The effect that it can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a mobile phone according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a relationship between current and voltage during operation of a charging circuit according to an embodiment of the present invention.
FIG. 3 is a flowchart showing a control operation by the charge control circuit of FIG. 1;
FIG. 4 is a block diagram showing a configuration of a conventional mobile phone.
FIG. 5 is a diagram showing a relationship between battery voltage and charging current when charging is completed.
FIG. 6 is a diagram illustrating a relationship between a battery voltage and a charging current when a communication operation is performed immediately before charging is completed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cellular phone 2 Charger 3 Battery 11 Cellular phone circuit 12 Charging control circuit 13 Constant current source 14 Constant voltage source 15, 18 Switch 16 Current voltage detection circuit 17, 19 Diode

Claims (4)

通信を行うための携帯電話回路の電源に用いる電池を充電器で充電可能な携帯電話機であって、
前記充電器から前記電池への定電流充電を行うための定電流源と、前記充電器から前記電池への定電圧充電を行うための定電圧源と、前記定電流源と前記定電圧源とを切替えて前記電池に接続する第１の切替手段と、前記定電圧源と前記電池とを切替えて前記携帯電話回路に接続する第２の切替手段と、前記携帯電話回路からの通信開始の通知の有無に基づいて前記第１及び第２の切替手段を制御して前記電池の充電動作と前記携帯電話回路への電力供給動作とを分けて行うように制御する制御手段とを有し、
前記制御手段は、充電開始時に前記第１の切替手段を前記定電流源側に切替えて定電流での充電を実施し、前記電池の電圧が所定電圧に上昇した時に前記第１の切替手段を前記定電圧源側に切替えて定電圧での充電に切替えるとともに、前記定電圧にて充電中に充電電流が所定電流以下になった時に充電完了として前記第１の切替手段をＯＦＦ設定にし、前記定電圧での充電中に前記通信開始の通知がきた時に前記第２の切替手段を前記電池側から前記定電圧源側に切替えて前記定電圧源側から前記携帯電話回路への電力供給を行うことを特徴とする携帯電話機。A mobile phone capable of charging with a charger a battery used as a power source of a mobile phone circuit for communication,
A constant current source for performing constant current charging from the charger to the battery; a constant voltage source for performing constant voltage charging from the charger to the battery; the constant current source and the constant voltage source; A first switching means for switching the battery and connecting to the battery; a second switching means for switching the constant voltage source and the battery to connect to the mobile phone circuit; and a communication start notification from the mobile phone circuit have a control means for controlling to perform separately a power supply operation to the charging operation and the mobile phone circuit of the battery by controlling the first and second switching means on the basis of the presence or absence of,
The control means switches the first switching means to the constant current source side at the start of charging, performs charging with a constant current, and turns the first switching means on when the voltage of the battery rises to a predetermined voltage. Switch to the constant voltage source side to switch to charging at a constant voltage, and when the charging current becomes equal to or less than a predetermined current during charging at the constant voltage, the first switching means is set to OFF as charging completion, When the communication start notification is received during charging at a constant voltage, the second switching means is switched from the battery side to the constant voltage source side to supply power from the constant voltage source side to the mobile phone circuit. A mobile phone characterized by that. 自端末における動作時の電流と非動作時の電流とが大きく異なることを特徴とする請求項１記載の携帯電話機。  2. The mobile phone according to claim 1, wherein a current during operation and a current during non-operation of the terminal are greatly different. 通信を行うための携帯電話回路の電源に用いる電池を充電器で充電可能な携帯電話機に用いる充電方法であって、
前記携帯電話機が、前記電池への定電流充電を行うための定電流源と、前記電池への定電圧充電を行うための定電圧源とを第１の切替手段で切替えて前記電池に接続する第１のステップと、第２の切替手段で前記定電圧源と前記電池とを切替えて前記携帯電話回路に接続する第２のステップと、前記電池の電流電圧を検出する第３のステップと、その検出結果と前記携帯電話回路からの通信開始の通知の有無とに応じて前記第１及び第２の切替手段を制御して前記電池の充電動作と前記携帯電話回路への電力供給動作とを分けて行うように制御する第４のステップとを実行し、
前記携帯電話機が、充電開始時に前記第１の切替手段を前記定電流源側に切替えて定電流での充電を実施し、前記電池の電圧が所定電圧に上昇した時に前記第１の切替手段を前記定電圧源側に切替えて定電圧での充電に切替えるとともに、前記定電圧にて充電中に充電電流が所定電流以下になった時に充電完了として前記第１の切替手段をＯＦＦ設定にし、前記定電圧での充電中に前記通信開始の通知がきた時に前記第２の切替手段を前記電池側から前記定電圧源側に切替えて前記定電圧源側から前記携帯電話回路への電力供給を行うことを特徴とする充電方法。A charging method used for a mobile phone capable of charging a battery used for a power source of a mobile phone circuit for communication with a charger,
The mobile phone is connected to the battery by switching a constant current source for performing constant current charging to the battery and a constant voltage source for performing constant voltage charging to the battery by a first switching means. A first step, a second step of switching between the constant voltage source and the battery by a second switching means and connecting to the mobile phone circuit; a third step of detecting a current voltage of the battery; Depending on the detection result and the presence or absence of communication start notification from the mobile phone circuit, the first and second switching means are controlled to perform the battery charging operation and the power supply operation to the mobile phone circuit. And a fourth step of controlling to be performed separately ,
When the mobile phone starts charging, the first switching means is switched to the constant current source side to perform charging with a constant current, and when the battery voltage rises to a predetermined voltage, the first switching means is Switch to the constant voltage source side to switch to charging at a constant voltage, and when the charging current becomes equal to or less than a predetermined current during charging at the constant voltage, the first switching means is set to OFF as charging completion, When the communication start notification is received during charging at a constant voltage, the second switching means is switched from the battery side to the constant voltage source side to supply power from the constant voltage source side to the mobile phone circuit. A charging method characterized by that. 前記携帯電話機における動作時の電流と非動作時の電流とが大きく異なることを特徴とする請求項３記載の充電方法。4. The charging method according to claim 3, wherein a current during operation and a current during non-operation of the mobile phone are greatly different.
JP2002335907A 2002-11-20 2002-11-20 Mobile phone and charging method used therefor Expired - Fee Related JP4144336B2 (en)

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