JP2004214989A - Power supply controller of communication terminal - Google Patents

Power supply controller of communication terminal Download PDF

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Publication number
JP2004214989A
JP2004214989A JP2002382562A JP2002382562A JP2004214989A JP 2004214989 A JP2004214989 A JP 2004214989A JP 2002382562 A JP2002382562 A JP 2002382562A JP 2002382562 A JP2002382562 A JP 2002382562A JP 2004214989 A JP2004214989 A JP 2004214989A
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Prior art keywords
power supply
communication terminal
switch
battery
state
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Naoji Tsunehiro
直司 常廣
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2002382562A priority Critical patent/JP2004214989A/en
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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

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  • Telephone Function (AREA)
  • Secondary Cells (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide the power supply controller of a communication terminal with reduced power consumption in a prescribed state even in a communication terminal provided with an integrated circuit as a component. <P>SOLUTION: The power supply controller comprises: a power source circuit 103 for supplying power from a battery through either one of a main power source circuit 201 and an auxiliary power source circuit 203 to a radio part 105 and a base band processing part 107 according to changeover by a switch 205; the radio part 105 for modulating and demodulating transmission / reception signals or the like; the base band processing part 107 for controlling the switch changeover of the power source circuit 103 at a prescribed timing; a switch 109 for turning ON/OFF a route from the battery to the power source circuit 103 by control from a timer circuit 111; and the timer circuit 111 for controlling the switch 109 at the prescribed timing instructed from the base band processing part 107 at the time of a standby state and an out-of-service-area state. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、集積回路を構成要素として含む通信端末であっても、所定状態、特に待ち受け状態およびサービス圏外状態における消費電力を削減することのできる通信端末の電源供給制御装置に関する。
【０００２】
【従来の技術】
従来より、携帯電話やＰＨＳ等の通信端末が待ち受け状態またはサービス圏外状態のときには、受信動作に不必要な回路には電源供給を行わないまたは小さくすることで、当該通信端末における消費電力を小さくしている。
【０００３】
【特許文献１】
特開平６−２９８９８号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、今日の通信端末はその小型化、薄型化に伴って各種回路は集積化されているため、半導体の製造プロセスの関係上、集積回路の一部分のみに対して電源供給を行わないまたは小さくするといったことは困難であるという問題点があった。
【０００５】
本発明は、上記従来の問題点に鑑みてなされたものであって、集積回路を構成要素として含む通信端末であっても、所定状態における消費電力を削減することのできる通信端末の電源供給制御装置を提供することを目的としている。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、本発明に係る通信端末の電源供給制御装置は、通信端末への電源供給を当該通信端末の状態に応じて制御する通信端末の電源供給制御装置であって、前記通信端末が通信状態のとき選択される主電源回路と、前記通信端末が非通信状態のとき選択される補助電源回路と、前記通信端末の電源となるバッテリからの電源供給経路を前記主電源回路を介する経路または前記補助電源回路を介する経路に切り替える第１のスイッチと、を有する電源回路と、前記通信端末の状態に応じて前記第１のスイッチの切り替え動作を制御する第１のスイッチ制御手段と、を備え、前記補助電源回路が選択されているとき前記通信端末に印加される電源電圧は、前記主電源回路が選択されているとき前記通信端末に印加される電源電圧よりも低い。したがって、通信端末が非通信状態のときに消費される電力を削減することができる。この結果、バッテリからの消費電流を削減することができる。
【０００７】
また、本発明に係る通信端末の電源供給制御装置は、前記補助電源回路が選択されているとき前記通信端末に印加される電源電圧は、非通信状態の前記通信端末が動作するために必要最低限の電圧であることが望ましい。
【０００８】
また、本発明に係る通信端末の電源供給制御装置は、前記バッテリから前記電源回路への経路を開閉する第２のスイッチと、前記通信端末が非通信状態のときに当該通信端末が間欠動作する所定のタイミングで前記第２のスイッチを制御する第２のスイッチ制御手段と、前記通信端末が待ち受け状態またはサービス圏外状態のとき、前記第１のスイッチ制御手段は、前記通信端末が間欠動作する間は前記補助電源回路を選択するよう前記第１のスイッチを制御し、前記第２のスイッチ制御手段は、前記通信端末が間欠動作する間は前記第２のスイッチを閉制御することが望ましい。
【０００９】
また、本発明に係る通信端末の電源供給制御装置は、前記バッテリからの充電が可能であって前記電源回路とは独立した２次電池と、前記バッテリから前記２次電池への経路を開閉する第３のスイッチと、前記２次電池の電池電圧を検出し、当該電池電圧が所定電圧以下であれば前記第３のスイッチを閉制御する電池電圧検出手段と、を備えている。したがって、２次電池の電池電圧が所定電圧以下になると２次電池にはバッテリから充電が行われるため、バッテリから電源が供給されないときであっても電源を供給することができる。
【００１０】
また、本発明に係る通信端末の電源供給制御装置は、前記通信端末内の発熱部から発生された熱を電気に変換して前記２次電池に充電する熱電気変換手段を備えている。さらに、本発明に係る通信端末の電源供給制御装置は、前記通信端末は送信電力に応じて前記２次電池を充電する送信出力パワー電圧出力変換素子を備えている。このように、通信端末のパワーが回生エネルギーとして利用される、すなわちエネルギーが有効活用されるため、消費電力を削減することができる。
【００１１】
【発明の実施の形態】
以下、本発明に係る通信端末の電源供給制御装置の実施の形態について、〔第１の実施形態〕、〔第２の実施形態〕の順に図面を参照して詳細に説明する。なお、通信端末とは、例えば携帯電話やＰＨＳ、ＰＤＡ等である。
【００１２】
〔第１の実施形態〕
図１は、本発明に係る第１の実施形態の通信端末の電源供給制御装置を示すブロック図である。同図に示すように、第１の実施形態の通信端末の電源供給制御装置は、アンテナ１０１と、電源回路１０３と、無線部１０５と、特許請求の範囲の第１のスイッチ制御手段に該当するベースバンド処理部１０７と、第２のスイッチに該当するスイッチ１０９と、第２のスイッチ制御手段に該当するタイマー回路１１１と、メモリ１１３と、２次電池１１５とを備えて構成されている。
【００１３】
以下、本実施形態の通信端末の電源供給制御装置が有する各構成要素について説明する。
まず、電源回路１０３は、主電源回路２０１、補助電源回路２０３および特許請求の範囲の第１のスイッチに該当するスイッチ２０５を有して構成されており、スイッチ２０５の切り替えによって、本実施形態の通信端末に装着されるバッテリ（図示せず）からの電源を主電源回路２０１および補助電源回路２０３のいずれか一方を介して無線部１０５およびベースバンド処理部１０７に供給するものである。なお、主電源回路２０１は本実施形態の通信端末が通信状態のときに選択され、補助電源回路２０３は待ち受け状態およびサービス圏外状態のときに選択される。また、本実施形態の通信端末の電源が切られている間は、スイッチ２０５によって主電源回路２０１および補助電源回路２０３のいずれも接続されていない開放状態とされる。さらに、主電源回路２０１と補助電源回路２０３とでは無線部１０５およびベースバンド処理部１０７に印加する電源電圧が異なり、主電源回路２０１の方が電源電圧は高い。
【００１４】
また、無線部１０５は、アンテナ１０１から受信した信号を復調等することによりベースバンド信号に変換したり、ベースバンド処理部１０７から得られたベースバンド信号を変調等してアンテナ１０１から送信する信号に変換するものである。また、ベースバンド処理部１０７は、ベースバンド信号を処理したり、電源回路１０３のスイッチ切り替えを所定のタイミングで制御するものである。なお、これら無線部１０５およびベースバンド処理部１０７への電源供給は電源回路１０３から行われる。
【００１５】
また、スイッチ１０９は、バッテリから電源回路１０３への経路をオンオフするものであり、タイマー回路１１１によって制御される。タイマー回路１１１は、本実施形態の通信端末が待ち受け状態およびサービス圏外状態のときは、ベースバンド処理部１０７から指示された所定のタイミングでスイッチ１０９を制御するものである。また、本実施形態の通信端末の電源が切られている状態（パワーオフ状態）のときはスイッチ１０９はオフ状態であるが、タイマー回路１１１は、予め設定された所定時刻になったり、当該通信端末がＡＣアダプタ等の周辺機器に接続されたときはスイッチ１０９をオンする。また、当該通信端末が通信中のとき、スイッチ１０９はオン状態である。
【００１６】
また、メモリ１１３は、時刻情報や本実施形態の通信端末に登録された情報を記憶するものである。また、２次電池１１５は、バッテリが本実施形態の通信端末から取り外されてもメモリ１１３に記憶されている情報を保持したりタイマー回路１１１を動作させるべく、メモリ１１３およびタイマー回路１１１に電源を供給するものである。
【００１７】
図２は、以上説明した電源回路１０３の主電源回路２０１、補助電源回路２０３およびスイッチ２０５と、タイマー回路１１１と、スイッチ１０９のタイムチャートである。同図に示すように、通信状態では、スイッチ１０９はオンされ、スイッチ２０５は主電源回路２０１側に接続されるため、無線部１０５およびベースバンド処理部１０７には主電源回路２０１を介した電源がバッテリから供給される。また、待ち受け状態およびサービス圏外状態では、タイマー回路１１１によって所定のタイミングでスイッチ１０９がオンオフ制御され、スイッチ２０５は当該所定のタイミングに合わせて補助電源回路２０３に接続または開放される。なお、スイッチ２０５が補助電源回路２０３側に接続されるときスイッチ１０９はオン状態に制御され、スイッチ２０５が開放されるときスイッチ１０９はオフ状態に制御される。
【００１８】
また、パワーオフ状態では、スイッチ１０９はオフされ、スイッチ２０５は開放される。但し、この状態のときにタイマー回路１１１から何らかのトリガーを受けると、スイッチ１０９はオン状態に制御され、スイッチ２０５は主電源回路２０１側に接続される。さらに、パワーオン状態では、スイッチ１０９はオンされ、スイッチ２０５は主電源回路２０１側に接続される。
【００１９】
以上説明したように、本実施形態の通信端末の電源供給制御装置によれば、無線部１０５およびベースバンド処理部１０７に供給される電源が当該通信端末の状態、すなわち、無線部１０５およびベースバンド処理部１０７の動作状態に応じて制御している。したがって、最低限必要な構成要素のみに電源が供給されることとなる、すなわち、無線部１０５およびベースバンド処理部１０７を構成する主要ＬＳＩの全ての要因をオフし、必要なタイマー回路１１１およびメモリ１１３のみ電源を供給するため、当該通信端末における消費電力を削減することができる。この結果、バッテリからの消費電流を削減することができ、当該通信端末の連続待ち受け時間等を従来以上に向上させることができる。
【００２０】
なお、送受信データの処理やアプリケーションデータの管理、周辺機器の制御処理等を実行する構成要素に対して、無線部１０５およびベースバンド処理部１０７と同様に、その動作状態に応じて電源を制御しても良い。
【００２１】
〔第２の実施形態〕
図３は、本発明に係る第２の実施形態の通信端末の電源供給制御装置を示すブロック図である。同図において、図１（第１の実施形態）と重複する部分には同一の符号を付して説明を省略する。図３に示すように、第２の実施形態の通信端末の電源供給制御装置は、第１の通信端末の電源供給制御装置が備える構成要素に加えて、特許請求の範囲の送信出力パワー電圧出力変換素子に該当するディレクションカプラ３０１と、熱電気変換手段に該当する熱電気変換素子３０３と、電池電圧検出手段に該当する低電圧検出回路３０５と、第３のスイッチに該当するスイッチ３０７と、定電圧レギュレータ３０９と、ショットキーバリアダイオード３１１とを備えて構成されている。本実施形態では、２次電池１１５に対して、ディレクションカプラ３０１や熱電気変換素子３０３による充電や、バッテリからの充電を行うことができる。
【００２２】
まず、ディレクションカプラ３０１および熱電気変換素子３０３は、２次電池１１５に対してバッテリからの充電回数を減らすために設けられている。ディレクションカプラ３０１の電圧出力から現在の送信出力が分かり、熱電気変換素子３０３は、特にＣＤＭＡ方式に対応した無線部１０５における送信電力に応じて２次電池１１５を充電するものである。また、熱電気変換素子３０３は、無線部１０５の発熱を電気に変換して、２次電池１１５を充電するものである。
【００２３】
また、低電圧検出回路３０５は、２次電池１１５の電池電圧を検出して、当該電池電圧が所定電圧以下になるとスイッチ３０７をオンするものである。スイッチ３０７がオンすると、定電圧レギュレータ３０９およびショットキーバリアダイオード３１１を介してバッテリから２次電池１１５に充電が始まる。但し、このとき本実施形態の通信端末にバッテリが装着されている必要がある。なお、定電圧レギュレータ３０９は、バッテリから２次電池１１５に印加される電圧が定電圧となるよう制御するものである。また、ショットキーバリアダイオード３１１は、２次電池１１５からバッテリ方向への電流を遮断するためのものである。
【００２４】
以上説明したように、本実施形態の通信端末の電源供給制御装置によれば、２次電池１１５の電池電圧が低電圧になると２次電池１１５にはバッテリから充電が行われるため、バッテリから電源が供給されないとき（スイッチ１０９がオフの状態）でのメモリ１１３やタイマー回路１１１に電源を継続的に供給することができる。また、２次電池１１５の電池電圧は低電圧検出回路３０５によって検出され、所定電圧以下になるとバッテリからの充電が行われるため、２次電池１１５は過放電しない。したがって、２次電池１１５の寿命を無駄に短くすることがなくなる。
【００２５】
さらに、２次電池１１５の充電はバッテリからの充電に限らず、無線部１０５の作用を利用してディレクションカプラ３０１や熱電気変換素子３０３によっても行われるため、当該通信端末の送信パワーを回生エネルギーとして利用することができる。このように、エネルギーが有効活用されるため、消費電力を削減することができる。
【００２６】
【発明の効果】
以上のように、本発明によれば待ち受け状態やサービス圏外状態などの所定状態時には補助電源から必要最小限の間欠電流を供給することで、携帯電話機のバッテリの消費電流を削減（セーブ）することができ、従って、通信方式によらずに連続する待ち受け時間などの回路稼動時間を従来以上に延長できるという利点が得られる。
【図面の簡単な説明】
【図１】本発明に係る第１の実施形態の通信端末の電源供給制御装置を示すブロック図
【図２】本発明に係る第１の実施形態の通信端末の電源供給制御装置のタイムチャート
【図３】本発明に係る第２の実施形態の通信端末の電源供給制御装置を示すブロック図
【符号の説明】
１０１ アンテナ
１０３ 電源回路
１０５ 無線部
１０７ ベースバンド処理部
１０９ スイッチ
１１１ タイマー回路
１１３ メモリ
１１５ ２次電池
２０１ 主電源回路
２０３ 補助電源回路
２０５ スイッチ
３０１ ディレクションカプラ
３０３ 熱電気変換素子
３０５ 低電圧検出回路
３０７ スイッチ
３０９ 定電圧レギュレータ
３１１ ショットキーバリアダイオード[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power supply control device for a communication terminal that can reduce power consumption in a predetermined state, particularly in a standby state and an out-of-service state, even if the communication terminal includes an integrated circuit as a component.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when a communication terminal such as a mobile phone or a PHS is in a standby state or an out-of-service state, power supply to circuits unnecessary for reception operation is not performed or reduced, thereby reducing power consumption in the communication terminal. ing.
[0003]
[Patent Document 1]
JP-A-6-29898
[Problems to be solved by the invention]
However, in today's communication terminals, various circuits are integrated with the miniaturization and thinning of the communication terminals. Therefore, due to the semiconductor manufacturing process, power supply is not performed to only a part of the integrated circuit or reduced. There was a problem that it was difficult.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a power supply control of a communication terminal capable of reducing power consumption in a predetermined state even in a communication terminal including an integrated circuit as a component. It is intended to provide a device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a power supply control device for a communication terminal according to the present invention is a power supply control device for a communication terminal that controls power supply to the communication terminal according to a state of the communication terminal, A main power supply circuit that is selected when the communication terminal is in a communication state, an auxiliary power supply circuit that is selected when the communication terminal is in a non-communication state, and a power supply path from a battery that is a power supply of the communication terminal; And a first switch for switching to a path via the auxiliary power supply circuit, and a first switch control means for controlling a switching operation of the first switch in accordance with a state of the communication terminal Wherein the power supply voltage applied to the communication terminal when the auxiliary power supply circuit is selected is a power supply applied to the communication terminal when the main power supply circuit is selected. Lower than the pressure. Therefore, it is possible to reduce the power consumed when the communication terminal is in the non-communication state. As a result, current consumption from the battery can be reduced.
[0007]
Further, the power supply control device for a communication terminal according to the present invention, the power supply voltage applied to the communication terminal when the auxiliary power supply circuit is selected is a minimum required for the communication terminal in a non-communication state to operate. It is desirable that the voltage be as high as possible.
[0008]
The power supply control device for a communication terminal according to the present invention may further include a second switch that opens and closes a path from the battery to the power supply circuit, and the communication terminal intermittently operates when the communication terminal is in a non-communication state. Second switch control means for controlling the second switch at a predetermined timing; and when the communication terminal is in a standby state or an out-of-service state, the first switch control means performs the intermittent operation of the communication terminal. Preferably, the first switch is controlled so as to select the auxiliary power supply circuit, and the second switch control means controls to close the second switch while the communication terminal operates intermittently.
[0009]
Further, the power supply control device for a communication terminal according to the present invention opens and closes a secondary battery that can be charged from the battery and is independent of the power supply circuit, and a path from the battery to the secondary battery. A third switch; and a battery voltage detecting means for detecting a battery voltage of the secondary battery and closing and controlling the third switch when the battery voltage is equal to or lower than a predetermined voltage. Therefore, when the battery voltage of the secondary battery becomes equal to or lower than the predetermined voltage, the secondary battery is charged from the battery, so that power can be supplied even when power is not supplied from the battery.
[0010]
Further, the power supply control device for a communication terminal according to the present invention includes thermoelectric conversion means for converting the heat generated from the heat generating portion in the communication terminal into electricity and charging the secondary battery. Further, in the power supply control device for a communication terminal according to the present invention, the communication terminal includes a transmission output power voltage output conversion element for charging the secondary battery according to transmission power. As described above, since the power of the communication terminal is used as regenerative energy, that is, the energy is effectively used, power consumption can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a power supply control device for a communication terminal according to the present invention will be described in detail with reference to the drawings in the order of [first embodiment] and [second embodiment]. The communication terminal is, for example, a mobile phone, PHS, PDA, or the like.
[0012]
[First Embodiment]
FIG. 1 is a block diagram illustrating a power supply control device for a communication terminal according to a first embodiment of the present invention. As shown in the figure, the power supply control device of the communication terminal according to the first embodiment corresponds to an antenna 101, a power supply circuit 103, a radio unit 105, and a first switch control unit in the claims. It comprises a baseband processing unit 107, a switch 109 corresponding to a second switch, a timer circuit 111 corresponding to a second switch control unit, a memory 113, and a secondary battery 115.
[0013]
Hereinafter, each component included in the power supply control device of the communication terminal according to the present embodiment will be described.
First, the power supply circuit 103 includes a main power supply circuit 201, an auxiliary power supply circuit 203, and a switch 205 corresponding to the first switch in the claims. The power from a battery (not shown) mounted on the communication terminal is supplied to the wireless unit 105 and the baseband processing unit 107 via one of the main power supply circuit 201 and the auxiliary power supply circuit 203. The main power supply circuit 201 is selected when the communication terminal of the present embodiment is in the communication state, and the auxiliary power supply circuit 203 is selected when the communication terminal is in the standby state or the out-of-service state. Further, while the power of the communication terminal of the present embodiment is turned off, the switch 205 keeps the main power supply circuit 201 and the auxiliary power supply circuit 203 in an open state in which neither is connected. Furthermore, the main power supply circuit 201 and the auxiliary power supply circuit 203 have different power supply voltages applied to the radio unit 105 and the baseband processing unit 107, and the main power supply circuit 201 has a higher power supply voltage.
[0014]
Radio section 105 converts a signal received from antenna 101 into a baseband signal by demodulating the signal, or modulates a baseband signal obtained from baseband processing section 107 and transmits the signal from antenna 101. Is converted to The baseband processing unit 107 processes a baseband signal and controls switching of the power supply circuit 103 at a predetermined timing. Note that power is supplied to the wireless unit 105 and the baseband processing unit 107 from the power supply circuit 103.
[0015]
The switch 109 turns on and off a path from the battery to the power supply circuit 103, and is controlled by the timer circuit 111. The timer circuit 111 controls the switch 109 at a predetermined timing specified by the baseband processing unit 107 when the communication terminal of the present embodiment is in the standby state or the out-of-service state. When the power of the communication terminal according to the present embodiment is turned off (power off state), the switch 109 is in the off state, but the timer circuit 111 reaches the predetermined time or sets the communication time. When the terminal is connected to a peripheral device such as an AC adapter, the switch 109 is turned on. Further, when the communication terminal is in communication, the switch 109 is on.
[0016]
Further, the memory 113 stores time information and information registered in the communication terminal of the present embodiment. Also, the secondary battery 115 supplies power to the memory 113 and the timer circuit 111 so as to retain the information stored in the memory 113 and operate the timer circuit 111 even when the battery is removed from the communication terminal of the present embodiment. Supply.
[0017]
FIG. 2 is a time chart of the main power supply circuit 201, the auxiliary power supply circuit 203, the switch 205, the timer circuit 111, and the switch 109 of the power supply circuit 103 described above. As shown in the figure, in the communication state, the switch 109 is turned on and the switch 205 is connected to the main power supply circuit 201 side, so that the wireless unit 105 and the baseband processing unit 107 supply power via the main power supply circuit 201. Is supplied from the battery. In the standby state and the out-of-service state, the switch 109 is turned on and off at a predetermined timing by the timer circuit 111, and the switch 205 is connected or opened to the auxiliary power supply circuit 203 at the predetermined timing. When the switch 205 is connected to the auxiliary power supply circuit 203, the switch 109 is controlled to be on, and when the switch 205 is opened, the switch 109 is controlled to be off.
[0018]
In the power off state, the switch 109 is turned off and the switch 205 is opened. However, if any trigger is received from the timer circuit 111 in this state, the switch 109 is controlled to the on state, and the switch 205 is connected to the main power supply circuit 201 side. Further, in the power-on state, the switch 109 is turned on, and the switch 205 is connected to the main power supply circuit 201 side.
[0019]
As described above, according to the power supply control device for a communication terminal of the present embodiment, the power supplied to the radio unit 105 and the baseband processing unit 107 is the state of the communication terminal, that is, the radio unit 105 and the baseband The control is performed according to the operation state of the processing unit 107. Therefore, power is supplied to only the minimum necessary components, that is, all the factors of the main LSI configuring the radio unit 105 and the baseband processing unit 107 are turned off, and the necessary timer circuit 111 and memory Since only 113 is supplied with power, power consumption in the communication terminal can be reduced. As a result, current consumption from the battery can be reduced, and the continuous standby time of the communication terminal can be improved more than before.
[0020]
In addition, as in the radio unit 105 and the baseband processing unit 107, the power supply is controlled according to the operation state of the components that perform processing of transmission / reception data, management of application data, control processing of peripheral devices, and the like. May be.
[0021]
[Second embodiment]
FIG. 3 is a block diagram illustrating a power supply control device for a communication terminal according to a second embodiment of the present invention. In the figure, the same reference numerals are given to the same parts as those in FIG. 1 (first embodiment), and the description will be omitted. As shown in FIG. 3, the power supply control device for a communication terminal according to the second embodiment includes, in addition to the components provided in the power supply control device for the first communication terminal, a transmission output power voltage output A directional coupler 301 corresponding to the conversion element, a thermoelectric conversion element 303 corresponding to the thermoelectric conversion means, a low voltage detection circuit 305 corresponding to the battery voltage detection means, and a switch 307 corresponding to the third switch. The configuration includes a voltage regulator 309 and a Schottky barrier diode 311. In the present embodiment, the secondary battery 115 can be charged by the directional coupler 301 or the thermoelectric conversion element 303 or charged from the battery.
[0022]
First, the directional coupler 301 and the thermoelectric conversion element 303 are provided to reduce the number of times the secondary battery 115 is charged from the battery. The current transmission output can be known from the voltage output of the direction coupler 301, and the thermoelectric conversion element 303 charges the secondary battery 115 in accordance with the transmission power in the wireless unit 105, which particularly supports the CDMA system. The thermoelectric conversion element 303 converts the heat generated by the wireless unit 105 into electricity and charges the secondary battery 115.
[0023]
The low voltage detection circuit 305 detects the battery voltage of the secondary battery 115, and turns on the switch 307 when the battery voltage becomes equal to or lower than a predetermined voltage. When the switch 307 is turned on, charging of the secondary battery 115 from the battery via the constant voltage regulator 309 and the Schottky barrier diode 311 starts. However, at this time, a battery needs to be mounted on the communication terminal of the present embodiment. The constant voltage regulator 309 controls the voltage applied from the battery to the secondary battery 115 to be a constant voltage. The Schottky barrier diode 311 is for interrupting a current from the secondary battery 115 toward the battery.
[0024]
As described above, according to the power supply control device of the communication terminal of the present embodiment, when the battery voltage of the secondary battery 115 becomes low, the secondary battery 115 is charged from the battery. Can be continuously supplied to the memory 113 and the timer circuit 111 when the power supply is not supplied (the switch 109 is off). In addition, the battery voltage of the secondary battery 115 is detected by the low voltage detection circuit 305, and when the battery voltage becomes equal to or lower than a predetermined voltage, the battery is charged. Therefore, the life of the secondary battery 115 is not shortened unnecessarily.
[0025]
Further, the charging of the secondary battery 115 is not limited to the charging from the battery, but is also performed by the directional coupler 301 and the thermoelectric conversion element 303 using the operation of the wireless unit 105. Can be used as As described above, since energy is effectively used, power consumption can be reduced.
[0026]
【The invention's effect】
As described above, according to the present invention, in a predetermined state such as a standby state or an out-of-service state, a necessary minimum intermittent current is supplied from the auxiliary power supply to reduce (save) the current consumption of the battery of the mobile phone. Therefore, there is an advantage that the circuit operating time such as a continuous standby time can be extended longer than before regardless of the communication method.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a power supply control device for a communication terminal according to a first embodiment of the present invention; FIG. 2 is a time chart of a power supply control device for a communication terminal according to the first embodiment of the present invention; FIG. 3 is a block diagram showing a power supply control device for a communication terminal according to a second embodiment of the present invention.
101 antenna 103 power supply circuit 105 radio section 107 baseband processing section 109 switch 111 timer circuit 113 memory 115 secondary battery 201 main power supply circuit 203 auxiliary power supply circuit 205 switch 301 directional coupler 303 thermoelectric conversion element 305 low voltage detection circuit 307 switch 309 Constant voltage regulator 311 Schottky barrier diode

Claims (6)

通信端末への電源供給を当該通信端末の状態に応じて制御する通信端末の電源供給制御装置であって、
前記通信端末が通信状態のとき選択される主電源回路と、前記通信端末が非通信状態のとき選択される補助電源回路と、前記通信端末の電源となるバッテリからの電源供給経路を前記主電源回路を介する経路または前記補助電源回路を介する経路に切り替える第１のスイッチと、を有する電源回路と、
前記通信端末の状態に応じて前記第１のスイッチの切り替え動作を制御する第１のスイッチ制御手段と、を備え、
前記補助電源回路が選択されているとき前記通信端末に印加される電源電圧は、前記主電源回路が選択されているとき前記通信端末に印加される電源電圧よりも低いことを特徴とする通信端末の電源供給制御装置。A power supply control device for a communication terminal that controls power supply to the communication terminal according to a state of the communication terminal,
A main power supply circuit selected when the communication terminal is in a communication state; an auxiliary power supply circuit selected when the communication terminal is in a non-communication state; and a main power supply path from a battery serving as a power supply of the communication terminal. A first switch for switching to a path via a circuit or a path via the auxiliary power supply circuit; and
First switch control means for controlling a switching operation of the first switch according to a state of the communication terminal,
A communication terminal, wherein a power supply voltage applied to the communication terminal when the auxiliary power supply circuit is selected is lower than a power supply voltage applied to the communication terminal when the main power supply circuit is selected. Power supply control device. 前記補助電源回路が選択されているとき前記通信端末に印加される電源電圧は、非通信状態の前記通信端末が動作するために必要最低限の電圧であることを特徴とする請求項１記載の通信端末の電源供給制御装置。The power supply voltage applied to the communication terminal when the auxiliary power supply circuit is selected is a minimum voltage necessary for the communication terminal in a non-communication state to operate. Power supply control device for communication terminals. 前記バッテリから前記電源回路への経路を開閉する第２のスイッチと、
前記通信端末が非通信状態のときに当該通信端末が間欠動作する所定のタイミングで前記第２のスイッチを制御する第２のスイッチ制御手段と、
前記通信端末が待ち受け状態またはサービス圏外状態のとき、
前記第１のスイッチ制御手段は、前記通信端末が間欠動作する間は前記補助電源回路を選択するよう前記第１のスイッチを制御し、
前記第２のスイッチ制御手段は、前記通信端末が間欠動作する間は前記第２のスイッチを閉制御することを特徴とする請求項１または２記載の通信端末の電源供給制御装置。A second switch for opening and closing a path from the battery to the power supply circuit;
Second switch control means for controlling the second switch at a predetermined timing at which the communication terminal intermittently operates when the communication terminal is in a non-communication state;
When the communication terminal is in a standby state or out of service state,
The first switch control means controls the first switch so as to select the auxiliary power supply circuit while the communication terminal operates intermittently,
The power supply control device for a communication terminal according to claim 1, wherein the second switch control unit closes the second switch while the communication terminal performs an intermittent operation. 前記バッテリからの充電が可能であって前記電源回路とは独立した２次電池と、
前記バッテリから前記２次電池への経路を開閉する第３のスイッチと、
前記２次電池の電池電圧を検出し、当該電池電圧が所定電圧以下であれば前記第３のスイッチを閉制御する電池電圧検出手段と、
を備えたことを特徴とする請求項１、２または３記載の通信端末の電源供給制御装置。A secondary battery that can be charged from the battery and is independent of the power supply circuit;
A third switch for opening and closing a path from the battery to the secondary battery;
Battery voltage detecting means for detecting a battery voltage of the secondary battery, and closing the third switch if the battery voltage is equal to or lower than a predetermined voltage;
The power supply control device for a communication terminal according to claim 1, 2, or 3, further comprising: 前記通信端末内の発熱部から発生された熱を電気に変換して前記２次電池に充電する熱電気変換手段を備えたことを特徴とする請求項４記載の通信端末の電源供給制御装置。The power supply control device for a communication terminal according to claim 4, further comprising thermoelectric conversion means for converting heat generated from a heat generating portion in the communication terminal into electricity and charging the secondary battery. 前記通信端末は送信電力に応じて前記２次電池を充電する送信出力パワー電圧出力変換素子を備えたことを特徴とする請求項４記載の通信端末の電源供給制御装置。The power supply control device for a communication terminal according to claim 4, wherein the communication terminal includes a transmission output power voltage output conversion element that charges the secondary battery according to transmission power.
JP2002382562A 2002-12-27 2002-12-27 Power supply controller of communication terminal Pending JP2004214989A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100692078B1 (en) 2005-07-07 2007-03-12 현대자동차주식회사 Sub-battery replacement notice apparatus for telematics and method of the same
US7899435B2 (en) 2005-09-16 2011-03-01 Nec Corporation Wireless communication unit, power control method for wireless communication unit and wireless network

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100692078B1 (en) 2005-07-07 2007-03-12 현대자동차주식회사 Sub-battery replacement notice apparatus for telematics and method of the same
US7899435B2 (en) 2005-09-16 2011-03-01 Nec Corporation Wireless communication unit, power control method for wireless communication unit and wireless network

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