JP2005333794A - Portable electronic devices and mobile telecommunication terminal - Google Patents

Portable electronic devices and mobile telecommunication terminal Download PDF

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JP2005333794A
JP2005333794A JP2005085623A JP2005085623A JP2005333794A JP 2005333794 A JP2005333794 A JP 2005333794A JP 2005085623 A JP2005085623 A JP 2005085623A JP 2005085623 A JP2005085623 A JP 2005085623A JP 2005333794 A JP2005333794 A JP 2005333794A
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charging
unit
charging current
storage battery
current
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JP4463131B2 (en
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Hidetoshi Takenaka
英俊 竹中
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NEC Saitama Ltd
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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
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable electronic devices in which the surface temperature of a casing never rises during charging regardless of the type of charger for charging an attached battery, and to provide a mobile telecommunication terminal. <P>SOLUTION: When a portable phone terminal has a radio portion 3, serving as a heating source and being operable with an attached battery pack 4 serving as power source, and connected to an external feeder device 5 with the battery pack 4 being attached, the battery pack 4 is charged by the electric current supplied from the external feeder device 5. When the radio portion 3 is being operated when the battery pack 4 is charged, the current value of charging current for charging the battery pack 4 is set to be smaller than the case where the radio portion 3 is not being operated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、携帯型の電子機器及び移動体通信端末に関し、充電中に使用しても筐体表面が高温にならない携帯型電子機器及び移動体通信端末に関する。   The present invention relates to a portable electronic device and a mobile communication terminal, and more particularly to a portable electronic device and a mobile communication terminal whose casing surface does not become hot even when used during charging.

近年、携帯型の電子機器としては、移動体通信端末、電子手帳、ＰＤＡなどが普及している。携帯型の電子機器は、端末の小型化・薄型化・軽量化に伴って、筐体に内蔵された発熱源（スピーカ、撮像素子、充電中の蓄電池、充電回路など）から筐体表面までの熱抵抗（空間的な距離）が減少しており、回路動作による筐体表面の温度上昇が大きくなる傾向にある。換言すると、移動体通信端末の小型化・薄型化・軽量化に伴って、筐体内部の発熱源で発生した熱が筐体へと伝わりやすくなっており、筐体表面が高温になりやすくなっている。   In recent years, mobile communication terminals, electronic notebooks, PDAs, and the like have become widespread as portable electronic devices. As portable electronic devices become smaller, thinner, and lighter, the heat sources (speakers, image sensors, rechargeable batteries, charging circuits, etc.) built into the case to the case surface Thermal resistance (spatial distance) is decreasing, and the temperature rise on the housing surface due to circuit operation tends to increase. In other words, as the mobile communication terminal becomes smaller, thinner, and lighter, heat generated by a heat source inside the housing is easily transferred to the housing, and the surface of the housing is likely to become hot. ing.

移動体通信端末における発熱源のうち「蓄電池を充電中の充電回路」は、移動体通信端末が通信状態にあると発熱量が大きくなる。移動体通信端末を通信に用いる場合、端末はユーザの顔に近づけた状態で使用されることが多いため、充電中に移動体通信端末を使用すると（通信状態にすると）、筐体の表面温度が上昇してユーザに不快感を与えることもあり得る。   Of the heat generation sources in the mobile communication terminal, the “charging circuit charging the storage battery” generates a large amount of heat when the mobile communication terminal is in communication. When using a mobile communication terminal for communication, the terminal is often used in the state of being close to the user's face, so if the mobile communication terminal is used during charging (when in communication), the surface temperature of the housing May rise and cause discomfort to the user.

移動体通信端末の筐体表面の温度上昇を抑止することに関する従来技術としては、特許文献１に開示される「充電方式」がある。特許文献１に開示される発明は、無線装置の使用時における充電電流を減少させることにより、電源部の大容量化を防止して充電器の小型化を可能とする充電方式である。
特開昭６２−９５９３４号公報 As a conventional technique related to suppressing a temperature rise on the surface of a housing of a mobile communication terminal, there is a “charging method” disclosed in Patent Document 1. The invention disclosed in Patent Document 1 is a charging method that reduces the charging current when the wireless device is used, thereby preventing the power supply unit from increasing its capacity and allowing the charger to be downsized.
JP-A-62-95934

しかし、特許文献１に開示される発明は、充電回路を無線装置（移動体通信端末）側に有していない。すなわち、特許文献１に開示される発明は、充電回路を備えた携帯型電子機器における発熱の防止を目的とするものではない。
具体的には、特許文献１に開示される発明は、充電器側からの制御によって無線装置内のスイッチを切り替えているが、このような構成とした場合には、専用の充電器と無線装置とを対として用いなければならない。すると、外出先で充電する必要が生じた場合のように、専用の充電器を用いることができない時には充電電流が減少せず、電池の発熱を避けることができないという問題が生じる。移動体通信端末に代表される携帯型電子機器は、旅行先や出張先などで他人の充電器を借用して蓄電池を充電しなければならないこともあるため、専用の充電器を用いなければ効果が得られないことは好ましいことではない。 However, the invention disclosed in Patent Document 1 does not have a charging circuit on the wireless device (mobile communication terminal) side. That is, the invention disclosed in Patent Document 1 is not intended to prevent heat generation in a portable electronic device including a charging circuit.
Specifically, the invention disclosed in Patent Document 1 switches the switch in the wireless device by control from the charger side. In such a configuration, the dedicated charger and the wireless device are switched. Must be used as a pair. Then, when it is necessary to charge on the go, there is a problem that when the dedicated charger cannot be used, the charging current does not decrease, and the heat generation of the battery cannot be avoided. Portable electronic devices typified by mobile communication terminals may have to charge storage batteries by borrowing other people's chargers at travel destinations or business trip destinations. It is not preferable that is not obtained.

また、特許文献１には、電源部と電池との双方から無線部へ給電される構成が図示されているが、電源部の出力電圧と電池電圧とは同じではなく（電源部出力電圧＞電池電圧）、しかも電池電圧は充電の度合に応じて変動する。よって、実際には、無線部は、電源部及び電池のそれぞれとの間に図示されていないレギュレータを必要とするため、回路規模の大型化や複雑化が避けられない。回路規模の大型化や複雑化は、電子機器の小型化や軽量化の妨げとなるため、携帯型の電子機器においては好ましいことではない。さらには、レギュレータが発する熱は、筐体の温度を上昇させる一因ともなるため、本来の目的である端末の温度上昇防止を達成しにくくなる。   Patent Document 1 shows a configuration in which power is supplied from both the power supply unit and the battery to the wireless unit, but the output voltage and battery voltage of the power supply unit are not the same (power supply unit output voltage> battery). Voltage), and the battery voltage varies depending on the degree of charging. Therefore, in actuality, the radio unit requires a regulator (not shown) between the power supply unit and the battery, so that an increase in circuit scale and complexity are inevitable. An increase in circuit scale and complexity impedes the reduction in size and weight of an electronic device, which is not preferable for a portable electronic device. Furthermore, since the heat generated by the regulator also contributes to increasing the temperature of the housing, it is difficult to achieve prevention of the terminal temperature increase, which is the original purpose.

このように、従来は、充電回路を備え、充電中に筐体の表面温度が上昇することを防止した携帯型電子機器及び移動体通信端末は提供されていなかった。   Thus, conventionally, a portable electronic device and a mobile communication terminal that include a charging circuit and prevent the surface temperature of the casing from increasing during charging have not been provided.

本発明はかかる問題に鑑みてなされたものであり、充電回路を備え、充電中に筐体の表面温度が上昇することを防止した携帯型電子機器及び移動体通信端末を提供することを目的とする。   The present invention has been made in view of such a problem, and an object thereof is to provide a portable electronic device and a mobile communication terminal that include a charging circuit and prevent the surface temperature of the casing from increasing during charging. To do.

上記目的を達成するため、本発明は、第１の態様として、発熱源となる電子デバイスを少なくとも一つ有し、装着された蓄電池を電力源として動作可能であり、蓄電池が装着されている状態で外部電源に接続された場合には、該外部電源から供給される電流で該蓄電池を充電する携帯型電子機器であって、蓄電池を充電する際に発熱源のいずれかが作動している場合には、蓄電池を充電するための充電電流の電流値を発熱源がいずれも作動していない場合よりも小さくすることを特徴とする携帯型電子機器を提供するものである。   In order to achieve the above object, the present invention, as a first aspect, has at least one electronic device serving as a heat generation source, can operate using the mounted storage battery as a power source, and the storage battery is mounted. When the battery is connected to an external power source, the portable electronic device charges the storage battery with a current supplied from the external power source, and any of the heat sources is operating when charging the storage battery. The present invention provides a portable electronic device characterized in that a current value of a charging current for charging a storage battery is made smaller than that when no heat source is operating.

上記本発明の第１の態様においては、外部電源から供給される電流を検出するための抵抗部をさらに有し、該抵抗部の抵抗値は少なくとも二つのいずれかに可変可能であり、該抵抗部における電圧降下に応じて充電電流の電流値を変化させることが好ましい。   In the first aspect of the present invention, a resistance unit for detecting a current supplied from an external power source is further included, and the resistance value of the resistance unit can be changed to at least two of the resistance units. It is preferable to change the current value of the charging current according to the voltage drop in the unit.

本発明の第１の態様の上記のいずれの構成においても、筐体の温度を測定する温度センサをさらに有し、該温度センサの検出する温度が所定値以上の場合にのみ充電電流を発熱源が非作動状態のときよりも小さくすることが好ましく、これに加えて、温度センサが、発熱源の近傍に設けられることがより好ましい。   In any of the above configurations of the first aspect of the present invention, the apparatus further includes a temperature sensor for measuring the temperature of the housing, and the charging current is generated only when the temperature detected by the temperature sensor is equal to or higher than a predetermined value. Is preferably smaller than that in a non-operating state, and in addition, a temperature sensor is more preferably provided in the vicinity of the heat generation source.

また、上記目的を達成するため、本発明は、第２の態様として、装着された蓄電池を電力源として動作可能であり、蓄電池が装着されている状態で外部電源に接続された場合には、該外部電源から供給される電流で該蓄電池を充電する移動体通信端末であって、通信状態にあるときに、蓄電池を充電するための充電電流の電流値を非通信状態にあるときよりも小さくすることを特徴とする移動体通信端末を提供するものである。   Moreover, in order to achieve the said objective, this invention can operate | move as a 2nd aspect by using the mounted storage battery as an electric power source, and when connected to an external power supply with the storage battery mounted, A mobile communication terminal that charges the storage battery with a current supplied from the external power supply, and when in a communication state, a current value of a charging current for charging the storage battery is smaller than that in a non-communication state A mobile communication terminal is provided.

上記本発明の第２の態様においては、外部電源から供給される電流を検出するための抵抗部をさらに有し、該抵抗部の抵抗値は少なくとも二つの値のいずれかに可変可能であり、該抵抗部における電圧降下に応じて充電電流の電流値を変化させることが好ましい。   In the second aspect of the present invention, it further includes a resistance portion for detecting a current supplied from an external power source, and the resistance value of the resistance portion can be changed to at least one of two values. It is preferable to change the current value of the charging current according to the voltage drop in the resistance portion.

本発明の上記のいずれの構成においても、筐体の温度を測定する温度センサをさらに有し、該温度センサの検出する温度が所定値以上の場合にのみ充電電流を非通信状態よりも小さくすることが好ましく、これに加えて、温度センサが、移動体通信用の信号を送受信するための通信部の近傍に設けることがより好ましい。   In any of the above configurations of the present invention, a temperature sensor for measuring the temperature of the housing is further included, and the charging current is made smaller than that in the non-communication state only when the temperature detected by the temperature sensor is equal to or higher than a predetermined value. In addition to this, it is more preferable that the temperature sensor is provided in the vicinity of the communication unit for transmitting and receiving signals for mobile communication.

本発明によれば、充電回路を備え、充電中に筐体の表面温度が上昇することを防止した携帯型電子機器及び移動体通信端末を提供できる。   ADVANTAGE OF THE INVENTION According to this invention, the portable electronic device and mobile communication terminal which were provided with the charging circuit and prevented the surface temperature of a housing | casing from rising during charging can be provided.

〔第１の実施形態〕
本発明を好適に実施した第１の実施形態について説明する。
図１に、本実施形態にかかる移動体通信端末の構成を示す。この移動体通信端末は、本体０、充電部１、制御部２及び無線部３を有する。 [First Embodiment]
A first embodiment in which the present invention is suitably implemented will be described.
FIG. 1 shows a configuration of a mobile communication terminal according to the present embodiment. This mobile communication terminal includes a main body 0, a charging unit 1, a control unit 2, and a wireless unit 3.

充電部１は、充電電流検出用抵抗部１２、充電電流検出回路８、外部電圧検出回路９、出力制御スイッチ７、電池温度検出回路１１、電池電圧検出回路１０及び充電制御回路６を有する。
充電電流検出用抵抗部１２は、充電端子２１に接続されている。充電電流検出回路８は、充電電流検出用抵抗部１２の両端に接続されており、充電電流検出用抵抗部１２における電圧降下量に基づいて、充電電流検出用抵抗部１２を流れる電流値が所定の閾値以上であるか否かを検出する。外部電圧検出回路９は、充電端子２１に接続されている。出力制御スイッチ７は、充電電流検出用抵抗部１２に接続されており、充電部１の出力を制御する。電池電圧検出回路１０は、充電部１の出力端子に接続されており、電池パック４の電池電圧を検出する。電池温度検出回路１１は、電池端子２２を介して電池パック４内の温度検出器２０に接続されており、電池パック４の温度を検出する。充電制御回路６は、充電電流検出回路８、外部電圧検出回路９、電池電圧検出回路１０、出力制御スイッチ７、電池温度検出回路１１に接続され、それぞれの検出回路で検出した結果により出力制御スイッチ７の状態を制御する。 The charging unit 1 includes a charging current detecting resistor 12, a charging current detecting circuit 8, an external voltage detecting circuit 9, an output control switch 7, a battery temperature detecting circuit 11, a battery voltage detecting circuit 10, and a charging control circuit 6.
The charging current detecting resistor 12 is connected to the charging terminal 21. The charging current detection circuit 8 is connected to both ends of the charging current detection resistor unit 12, and a current value flowing through the charging current detection resistor unit 12 is predetermined based on the voltage drop amount in the charging current detection resistor unit 12. It is detected whether it is more than the threshold value. The external voltage detection circuit 9 is connected to the charging terminal 21. The output control switch 7 is connected to the charging current detection resistor unit 12 and controls the output of the charging unit 1. The battery voltage detection circuit 10 is connected to the output terminal of the charging unit 1 and detects the battery voltage of the battery pack 4. The battery temperature detection circuit 11 is connected to the temperature detector 20 in the battery pack 4 via the battery terminal 22 and detects the temperature of the battery pack 4. The charging control circuit 6 is connected to the charging current detection circuit 8, the external voltage detection circuit 9, the battery voltage detection circuit 10, the output control switch 7, and the battery temperature detection circuit 11, and the output control switch is determined according to the detection result of each detection circuit. 7 state is controlled.

充電部１の出力は、制御部２及び無線部３へ電源として供給されるとともに、電池端子２２を介して電池パック４へも供給される。
充電電流検出用抵抗部１２は、抵抗２４と、これに直列に接続されたスイッチ２５と、抵抗２４及びスイッチ２５に並列に接続された抵抗２３とから構成される。スイッチ２５は、無線部３が通信状態にある場合にはＯＦＦ、停止状態（非通信状態）にある場合にはＯＮとなるようにＣＰＵ１３によって制御される。 The output of the charging unit 1 is supplied as a power source to the control unit 2 and the wireless unit 3 and also supplied to the battery pack 4 via the battery terminal 22.
The charging current detection resistor unit 12 includes a resistor 24, a switch 25 connected in series to the resistor 24, and a resistor 24 and a resistor 23 connected in parallel to the switch 25. The switch 25 is controlled by the CPU 13 such that the switch 25 is turned off when the wireless unit 3 is in a communication state and turned on when the wireless unit 3 is in a stopped state (non-communication state).

制御部２は、表示部１４、操作部１５、音声処理回路１６及びＣＰＵ１３を有する。表示部１４は、ユーザに情報を視覚的に提示するための機能部である。操作部１５は、ユーザが移動体通信端末を操作するためのインタフェースである。音声処理回路１６は、無線部３、スピーカ１７及びマイク１８に接続されており、音声信号の変調や復調を行う。ＣＰＵ１３は、表示部１４、操作部１５、音声処理回路１６、無線部３、充電制御回路６及びスイッチ２５にそれぞれ接続されており、各部の状態検出や制御を行う。   The control unit 2 includes a display unit 14, an operation unit 15, a sound processing circuit 16, and a CPU 13. The display unit 14 is a functional unit for visually presenting information to the user. The operation unit 15 is an interface for the user to operate the mobile communication terminal. The audio processing circuit 16 is connected to the wireless unit 3, the speaker 17, and the microphone 18, and modulates and demodulates the audio signal. The CPU 13 is connected to the display unit 14, the operation unit 15, the audio processing circuit 16, the wireless unit 3, the charging control circuit 6, and the switch 25, and performs state detection and control of each unit.

電池パック４は、電池セル１９及び温度検出器２０を有する。電池セル１９は、電荷を蓄積・放出するための部材である。温度検出器２０は、電池パック４の温度を検出する。   The battery pack 4 includes a battery cell 19 and a temperature detector 20. The battery cell 19 is a member for accumulating and releasing electric charges. The temperature detector 20 detects the temperature of the battery pack 4.

外部給電器５は、本体０の外部に露出した充電端子２１を介して充電部１に接続され、商用電源や車載電源から供給される電流を、安定した直流電源に変換して充電部１に供給する。   The external power supply 5 is connected to the charging unit 1 via the charging terminal 21 exposed to the outside of the main body 0, and converts the current supplied from the commercial power source or the on-vehicle power source into a stable DC power source to the charging unit 1. Supply.

図５に、携帯電話端末の外観を示す。本体０は、上側筐体２８及び下側筐体２７とで構成されており、上側筐体２８は表示部１４及びスピーカ１７を、下側筐体２７は操作部１５、マイク１８及び充電端子２１を備えている。   FIG. 5 shows the appearance of the mobile phone terminal. The main body 0 includes an upper housing 28 and a lower housing 27, the upper housing 28 includes the display unit 14 and the speaker 17, and the lower housing 27 includes the operation unit 15, the microphone 18, and the charging terminal 21. It has.

図６に、下側筐体２７の内部構成例を示す。下側筐体２７の内部には、無線部３、制御部２、充電部１、電池端子２２が配置される。   FIG. 6 shows an internal configuration example of the lower housing 27. Inside the lower housing 27, the wireless unit 3, the control unit 2, the charging unit 1, and the battery terminal 22 are arranged.

携帯電話端末の充電中の動作について説明する。
図７に、本実施形態にかかる携帯電話端末の筐体表面温度の変化を示す。なお、比較のため、従来構成の携帯電話端末の筐体表面温度の変化も合わせて示す。初期状態（時刻ｔ０）においては、携帯電話端末の筐体表面の温度は室温と同じとする。 An operation during charging of the mobile phone terminal will be described.
FIG. 7 shows changes in the housing surface temperature of the mobile phone terminal according to the present embodiment. For comparison, the change in the surface temperature of the casing of the mobile phone terminal having the conventional configuration is also shown. In the initial state (time t0), the temperature of the housing surface of the mobile phone terminal is the same as the room temperature.

時刻ｔ０からｔ１の期間は、電池パック４の充電のみが行われている。電池パック４の充電のみを行う状態では、外部給電器５は充電端子２１に接続されており、充電部１によって電池パック４が充電される。この時、無線部３は停止状態（非通信状態）であり、スイッチ２５は、ＣＰＵ１３によってオンに制御されている。
電池パック４の充電が開始されると、充電部１が発する熱が筐体に伝わって、充電部１付近の筐体表面温度はｋ２に達し、無線部３付近の筐体表面温度はｋ１に達する。 Only the battery pack 4 is charged during the period from time t0 to t1. In a state where only the battery pack 4 is charged, the external power feeder 5 is connected to the charging terminal 21, and the battery pack 4 is charged by the charging unit 1. At this time, the wireless unit 3 is in a stopped state (non-communication state), and the switch 25 is controlled to be turned on by the CPU 13.
When charging of the battery pack 4 is started, the heat generated by the charging unit 1 is transmitted to the housing, the housing surface temperature near the charging unit 1 reaches k2, and the housing surface temperature near the wireless unit 3 reaches k1. Reach.

時刻ｔ１からｔ２までの期間は、通話のみが行われている。通話のみを行う状態では、外部給電器５は充電端子２１に接続されておらず、充電部１は停止状態となっている。また、無線部３は通信状態にあり、スイッチ２５はＣＰＵ１３によってオフに制御されている。
この状態では、通信状態にある無線部３の発熱によって、下側筐体２７の無線部３付近の温度はｋ２に達する。また、充電部１付近の筐体表面温度は、電池パック４を充電している時よりは低くなるものの、無線部３から熱が伝わるために室温までは低下せず、温度ｋ１で定常状態となる。 Only a call is made during the period from time t1 to t2. In a state where only a call is performed, the external power feeder 5 is not connected to the charging terminal 21 and the charging unit 1 is in a stopped state. The wireless unit 3 is in a communication state, and the switch 25 is controlled to be turned off by the CPU 13.
In this state, the temperature near the wireless unit 3 of the lower casing 27 reaches k2 due to heat generated by the wireless unit 3 in the communication state. Moreover, although the housing | casing surface temperature of the charging part 1 vicinity becomes lower than the time of charging the battery pack 4, since heat | fever is transmitted from the radio | wireless part 3, it does not fall to room temperature, and it is in a steady state at the temperature k1. Become.

時刻ｔ２からｔ３の期間は、電池パック４の充電と通話とが同時に行われている。電池パック４の充電と通話とを同時に行う場合には、外部給電器５は充電端子２１に接続され、無線部３は通信状態となる。また、スイッチ２５はＣＰＵ１３によってオフに制御される。
この状態においては、下側筐体２７の充電部１付近及び無線部３付近の表面温度は、相互の熱伝導によって煽られるため、充電部１や無線部３が単独で動作する時よりも高くなる。 During the period from time t2 to t3, charging of the battery pack 4 and a telephone call are performed simultaneously. When charging the battery pack 4 and making a call at the same time, the external power feeder 5 is connected to the charging terminal 21 and the wireless unit 3 is in a communication state. The switch 25 is controlled to be turned off by the CPU 13.
In this state, the surface temperatures of the lower casing 27 near the charging unit 1 and the wireless unit 3 are swollen by mutual heat conduction, and therefore higher than when the charging unit 1 and the wireless unit 3 operate independently. Become.

筐体表面温度は、熱源の発熱量と、熱源から筐体表面までの熱抵抗で定まるが、充電部１の主たる発熱源は、充電用電流検出用抵抗部１２と出力制御スイッチ７である（熱抵抗の定義は本発明の主旨とは直接は関係しないので、説明は割愛する）。無線部３の熱源は、送信部にあり、発熱量は主にその出力電力によって定まる。   The case surface temperature is determined by the amount of heat generated by the heat source and the thermal resistance from the heat source to the case surface, and the main heat source of the charging unit 1 is the charging current detection resistor unit 12 and the output control switch 7 ( Since the definition of thermal resistance is not directly related to the gist of the present invention, the description is omitted). The heat source of the wireless unit 3 is in the transmission unit, and the amount of heat generation is mainly determined by the output power.

充電電流検出用抵抗部１２に充電電流が流れると、充電電流検出回路８では充電電流検出用抵抗部１２での電圧降下量が所定の閾値以上として検出される。充電制御回路６は、この電圧降下量が一定となるように出力制御スイッチ７を制御する。すなわち、充電制御回路６は、充電電流を所定電流（Ｉchg）に制御している。なお、Ｉchgは、電池パック４の容量がＣ［ｍＡｈ］であるならば、Ｃ［ｍＡ］程度とすることが一般的である。 When a charging current flows through the charging current detection resistor 12, the charging current detection circuit 8 detects the voltage drop amount at the charging current detection resistor 12 as a predetermined threshold value or more. The charge control circuit 6 controls the output control switch 7 so that the voltage drop amount is constant. That is, the charging control circuit 6 controls the charging current to a predetermined current (I chg ). Note that I chg is generally about C [mA] if the capacity of the battery pack 4 is C [mAh].

充電電流検出用抵抗部１２の抵抗値をＲchg［Ω］、外部給電器５の出力電圧をＶchg［Ｖ］、電池パック４の電圧（＝充電部１の出力電圧）をＶbatt［Ｖ］とすると、充電電流検出用抵抗部１２の発熱量は、
Ｒchg×Ｉchg 2［Ｗ］・・・（１）
出力制御スイッチ７の発熱量は、
（Ｖchg−Ｒchg×Ｉchg−Ｖbatt）×Ｉchg
≒（Ｖchg−Ｖbatt）×Ｉchg［Ｗ］・・・（２）
となる。 The resistance value of the charging current detection resistor 12 is R chg [Ω], the output voltage of the external power supply 5 is V chg [V], and the voltage of the battery pack 4 (= the output voltage of the charging unit 1) is V batt [V ], The calorific value of the charging current detecting resistor 12 is
R chg × I chg 2 [W] (1)
The amount of heat generated by the output control switch 7 is
(V chg −R chg × I chg −V batt ) × I chg
≒ (V chg -V batt ) x I chg [W] (2)
It becomes.

式（１）、（２）から明らかなように、充電電流検出用抵抗部１２の発熱量及び出力制御スイッチ７の発熱量はいずれもＩchgが増加すると大きくなるため、充電電流（Ｉchg）を制御すれば発熱量を制御できる。 As is apparent from the equations (1) and (2), the amount of heat generated by the charging current detection resistor 12 and the amount of heat generated by the output control switch 7 both increase as I chg increases. Therefore , the charging current (I chg ) The amount of heat generated can be controlled by controlling.

図８に、従来の携帯電話端末の構成を示す。従来の携帯電話端末は、本実施形態にかかる携帯電話端末とは充電電流検出部抵抗部１２の構成が異なっており、抵抗２９のみで構成されている。すなわち、従来構成の携帯電話端末は、端末の状態に関わらず充電電流（Ｉchg）は所定値Ｃ［ｍＡ］である。 FIG. 8 shows a configuration of a conventional mobile phone terminal. The conventional mobile phone terminal is different from the mobile phone terminal according to the present embodiment in the configuration of the charging current detection unit resistance unit 12, and is configured only by the resistor 29. That is, in the conventional mobile phone terminal, the charging current (I chg ) is the predetermined value C [mA] regardless of the state of the terminal.

一方、本実施形態にかかる携帯電話端末においては、無線部３の通信状態（通信状態にあるか否か）に応じて、充電電流検出用抵抗部１２のスイッチ２５をＣＰＵ１３が切り替える。スイッチ２５がオン（通電状態）のときは、抵抗２３及び抵抗２４の合成抵抗値が従来構成の携帯電話端末の抵抗２９と同じ値となり、充電電流（Ｉchg）はＣ［ｍＡ］となる。 On the other hand, in the mobile phone terminal according to the present embodiment, the CPU 13 switches the switch 25 of the charging current detection resistor unit 12 according to the communication state of the wireless unit 3 (whether or not it is in the communication state). When the switch 25 is on (energized state), the combined resistance value of the resistor 23 and the resistor 24 is the same value as the resistor 29 of the conventional mobile phone terminal, and the charging current (I chg ) is C [mA].

ここで、抵抗２３の抵抗値をＲ１［Ω］、抵抗２４の抵抗値をＲ２［Ω］、抵抗２５の抵抗値をＲ３［Ω］とし、説明の簡略化のためにＲ１＝Ｒ２とすると、スイッチ２５がオンの時の充電電流検出用抵抗部１２の抵抗値Ｒchg1は、
Ｒchg1＝Ｒ１×Ｒ２／（Ｒ１＋Ｒ２）＝（１／２）×Ｒ１＝Ｒ３［Ω］・・・（３）
となる。 Here, assuming that the resistance value of the resistor 23 is R1 [Ω], the resistance value of the resistor 24 is R2 [Ω], the resistance value of the resistor 25 is R3 [Ω], and R1 = R2 for simplification of explanation, The resistance value R chg1 of the charging current detection resistor 12 when the switch 25 is on is
R chg1 = R1 × R2 / (R1 + R2) = (1/2) × R1 = R3 [Ω] (3)
It becomes.

また、スイッチ２５がオフ（絶縁状態）となると、充電電流（Ｉchg）は抵抗２３のみを流れる。すなわち、この時の充電電流検出用抵抗部１２の抵抗値Ｒchg2は、
Ｒchg2＝Ｒ１＝２×Ｒ３［Ω］・・・（４）
となる。 When the switch 25 is turned off (insulated), the charging current (I chg ) flows only through the resistor 23. That is, the resistance value R chg2 of the charging current detecting resistor 12 at this time is
R chg2 = R1 = 2 × R3 [Ω] (4)
It becomes.

先に説明したように、本実施形態にかかる携帯電話端末は、充電電流検出回路８が充電電流検出用抵抗部１２の電圧降下量を検出し、電圧降下量が一定となるように充電制御回路６が出力制御スイッチ７を制御する。このため、スイッチ２５がオフの時の充電電流をＩchg2とすると、
Ｒchg1×Ｉchg1＝Ｒchg2×Ｉchg2
（１／２）×Ｒ１×Ｃ＝Ｒ１×Ｉchg2
Ｉchg2＝１／２×Ｃ・・・（５）
となり、充電電流がスイッチ２５がオンの時の１／２となる。 As described above, in the mobile phone terminal according to the present embodiment, the charge control circuit 8 detects the voltage drop amount of the charge current detection resistor unit 12 so that the voltage drop amount is constant. 6 controls the output control switch 7. Therefore, if the charging current when the switch 25 is off is I chg2 ,
R chg1 × I chg1 = R chg2 × I chg2
(1/2) × R1 × C = R1 × I chg2
I chg2 = 1/2 × C (5)
Thus, the charging current is ½ that when the switch 25 is on.

よって、式（１）〜（５）から、スイッチ２５がオフの時、充電電流検出用抵抗部１２及び出力制御スイッチ７の発熱量は、スイッチ２５がオンの時の１／２となる。   Therefore, from the formulas (1) to (5), when the switch 25 is off, the heat generation amount of the charging current detection resistor 12 and the output control switch 7 is ½ that when the switch 25 is on.

図７の時刻ｔ２からｔ３の期間では下側筐体２７の表面温度は、従来の携帯電話端末（図７中に“Ｇ”で示す。）と比較して、本実施形態にかかる携帯電話端末（図７中に“Ｆ”で示す。）の方が低くなっており、筐体表面温度の上昇が抑制されている。   In the period from time t2 to time t3 in FIG. 7, the surface temperature of the lower casing 27 is higher than that of the conventional mobile phone terminal (indicated by “G” in FIG. 7). (Indicated by “F” in FIG. 7) is lower, and the rise in the housing surface temperature is suppressed.

なお、上記の説明においては説明の簡略化のために抵抗２３の抵抗値Ｒ１と抵抗２４の抵抗値Ｒ２とが等しい（Ｒ１＝Ｒ２）としたが、この条件に限定されることはなく、充電電流検出用抵抗部１２の抵抗値がＲ１とＲ２との合成抵抗値であるときに充電電流ＩchgがＣ［ｍＡ］となるようにし、充電電流検出用抵抗部１２の抵抗値がＲ１である場合に通話時の最大消費電流を補える程度の充電電流値に設定すればよい。 In the above description, the resistance value R1 of the resistor 23 and the resistance value R2 of the resistor 24 are equal (R1 = R2) for simplification of the description. However, the present invention is not limited to this condition. When the resistance value of the current detection resistor unit 12 is a combined resistance value of R1 and R2, the charging current I chg is set to C [mA], and the resistance value of the charging current detection resistor unit 12 is R1. In such a case, the charging current value may be set so as to compensate for the maximum current consumption during a call.

このように、本実施形態にかかる携帯電話端末は、充電中には無線部３の動作状態に応じてＣＰＵ１３が充電電流検出用抵抗部１２のスイッチを切り替えて（無線部３が通信状態ならばスイッチ２５をオン、停止状態ならばスイッチ２５をオフ）、充電部１での発熱量を低減させる。これにより、携帯電話端末の筐体表面の温度上昇を抑制できる。
なお、上記構成において、充電電流の制御は全て携帯電話端末内で行われるため、外部給電器５側に特別な構成を必要としない。すなわち、電池パック４の定格に適合するものを用いる必要はあるものの、外部給電器５としては一般的な充電器を用いることができる。 Thus, in the mobile phone terminal according to the present embodiment, during charging, the CPU 13 switches the switch of the charging current detection resistor 12 according to the operating state of the wireless unit 3 (if the wireless unit 3 is in the communication state). The switch 25 is turned on, and if it is stopped, the switch 25 is turned off). Thereby, the temperature rise of the housing | casing surface of a mobile telephone terminal can be suppressed.
In the above configuration, since the charging current is all controlled in the mobile phone terminal, no special configuration is required on the external power feeder 5 side. That is, a general battery charger can be used as the external power supply 5 although it is necessary to use a battery pack 4 that conforms to the rating of the battery pack 4.

本実施形態によれば、筐体表面の温度上昇を抑制し、充電中でもユーザが安全に使用できる携帯電話端末を提供できる。   According to the present embodiment, it is possible to provide a mobile phone terminal that can suppress a temperature rise on the surface of the housing and can be used safely by the user even during charging.

〔第２の実施形態〕
本発明を好適に実施した第２の実施形態について説明する。
図２に、本実施形態にかかる携帯電話端末の構成を示す。本実施形態にかかる携帯電話端末は、第１の実施形態にかかる携帯電話端末とほぼ同様の構成である。ただし、本実施形態においては、充電電流検出用抵抗部１２は、抵抗２３のみで構成される。 [Second Embodiment]
A second embodiment in which the present invention is suitably implemented will be described.
FIG. 2 shows a configuration of the mobile phone terminal according to the present embodiment. The mobile phone terminal according to the present embodiment has substantially the same configuration as the mobile phone terminal according to the first embodiment. However, in the present embodiment, the charging current detection resistor unit 12 is configured by only the resistor 23.

充電電流検出回路８は、第１の実施形態では充電電流検出用抵抗部１２での電圧降下量が閾値以上であるか否かを検出していたが、本実施形態では閾値を複数有しており、電圧降下量がどの範囲にあるかを検出している。   In the first embodiment, the charging current detection circuit 8 detects whether or not the voltage drop amount in the charging current detection resistor unit 12 is greater than or equal to the threshold value. In this embodiment, the charging current detection circuit 8 has a plurality of threshold values. Thus, the range of the voltage drop is detected.

充電制御回路６は、抵抗値検出用抵抗部１２での電圧降下量がどの範囲にあるかを充電電流検出回路８から通知されると出力制御スイッチ７を制御し、電圧降下量に応じた電流値となるように充電電流の電流値を制御する。   The charging control circuit 6 controls the output control switch 7 when notified from the charging current detection circuit 8 which range the voltage drop amount in the resistance value detection resistor unit 12 is in, and a current corresponding to the voltage drop amount The current value of the charging current is controlled to be a value.

本実施形態における動作は、充電電流抵抗用検出部１２のスイッチ２５のオン・オフ制御を充電電流検出回路８の閾値に置き換えたものであり、これ以外については上記第１の実施形態と同様であるため、重複する説明は省略する。   The operation in this embodiment is the same as that in the first embodiment except that the on / off control of the switch 25 of the charging current resistance detection unit 12 is replaced with the threshold value of the charging current detection circuit 8. Therefore, redundant description is omitted.

〔第３の実施形態〕
本発明を好適に実施した第３の実施形態について説明する。
第１の実施形態にかかる携帯電話端末は、電池パック４を充電中で無線部３が通信状態にある場合には、常に充電電流を小さくして、筐体表面温度の上昇を抑制していた。しかし、電池パック４を充電中かつ無線部３が通信状態にある場合でも、筐体表面温度が高くなければ、充電電流を小さくする必要はない。よって、電池パックを充電中かつ通信状態にある場合に常に充電電流を小さくしてしまうと、電池パック４の充電に要する時間が必要以上に長くなってしまう。 [Third Embodiment]
A third embodiment in which the present invention is preferably implemented will be described.
In the mobile phone terminal according to the first embodiment, when the battery unit 4 is being charged and the wireless unit 3 is in a communication state, the charging current is always reduced to suppress an increase in the housing surface temperature. . However, even when the battery pack 4 is being charged and the wireless unit 3 is in a communication state, it is not necessary to reduce the charging current unless the housing surface temperature is high. Therefore, if the charging current is always reduced when the battery pack is being charged and in the communication state, the time required for charging the battery pack 4 becomes longer than necessary.

よって、本実施形態においては、筐体表面の温度に応じて充電電流の大きさを変更する携帯電話端末について説明する。   Therefore, in the present embodiment, a mobile phone terminal that changes the magnitude of the charging current according to the temperature of the housing surface will be described.

図３に、本実施形態にかかる携帯電話端末の構成を示す。本実施形態にかかる携帯電話端末は第１の実施形態とほぼ同様の構成であり、充電部１、制御部２及び無線部３を有する。ただし、本実施形態において携帯電話端末は温度センサ２６をさらに備えている。
温度センサ２６は、筐体表面の温度を測定するセンサである。温度センサ２６は任意の位置に配置可能であるが、無線部３の近傍に配置することが好ましい。 FIG. 3 shows the configuration of the mobile phone terminal according to the present embodiment. The mobile phone terminal according to the present embodiment has substantially the same configuration as that of the first embodiment, and includes a charging unit 1, a control unit 2, and a radio unit 3. However, in the present embodiment, the mobile phone terminal further includes a temperature sensor 26.
The temperature sensor 26 is a sensor that measures the temperature of the housing surface. The temperature sensor 26 can be arranged at an arbitrary position, but is preferably arranged in the vicinity of the wireless unit 3.

本実施形態にかかる携帯電話端末の動作について説明する。
本実施形態にかかる携帯電話端末の動作は第１の実施形態とほぼ同様であるが、ＣＰＵ１３は温度センサ２６から通知される温度が閾値未満のときは、充電中かつ通信状態であっても充電電流を切り替えず、充電中かつ通信状態でありさらに温度センサ２６から通知される温度が閾値以上となとなったときに出力制御スイッチ７を制御して充電電流を切り替える。 The operation of the mobile phone terminal according to the present embodiment will be described.
The operation of the mobile phone terminal according to the present embodiment is almost the same as that of the first embodiment. However, when the temperature notified from the temperature sensor 26 is lower than the threshold value, the CPU 13 charges even during charging and in the communication state. Without switching the current, the charging current is switched by controlling the output control switch 7 when charging is in the communication state and the temperature notified from the temperature sensor 26 is equal to or higher than the threshold value.

無線部３の熱源は送信部であり、その出力電力は無線部３での受信状態に応じてＣＰＵ１３によってパワーダウン制御される（他の局からの無線信号を無線部３での良好に受信できているのであれば、発信する無線信号も低出力で良いため。）のが一般的である。無線部３の発熱量は主にこのパワーダウン制御によって定まるため、送信部の出力電力がパワーダウンされれば、発熱量も小さくなる。すなわち、無線部３が低出力で動作している場合（弱い無線信号を送出している場合）には、通信状態であっても無線部３の発熱による筐体温度の上昇は小さい。   The heat source of the wireless unit 3 is a transmitting unit, and the output power of the wireless unit 3 is controlled by the CPU 13 in accordance with the reception state of the wireless unit 3 (the wireless unit 3 can receive radio signals from other stations satisfactorily. If so, the radio signal to be transmitted may be low output.) Since the heat generation amount of the wireless unit 3 is mainly determined by this power-down control, if the output power of the transmission unit is powered down, the heat generation amount is also reduced. That is, when the wireless unit 3 is operating at a low output (when a weak wireless signal is transmitted), an increase in the housing temperature due to heat generated by the wireless unit 3 is small even in a communication state.

本実施形態にかかる携帯電話端末は、充電中かつ通信状態にある場合でも、筐体の温度が所定の温度未満であれば、充電電流を小さくしないため、無線部３が低出力で動作している場合には充電時間が長くはならない。   Even when the mobile phone terminal according to the present embodiment is being charged and in a communication state, if the temperature of the casing is lower than a predetermined temperature, the wireless unit 3 operates at a low output in order not to reduce the charging current. If it is, the charging time will not be long.

このように、本実施形態にかかる携帯電話端末は、低出力で通信中の充電を効率的に行える。   Thus, the mobile phone terminal according to the present embodiment can efficiently perform charging during communication with low output.

〔第４の実施形態〕
本発明を好適に実施した第４の実施形態について説明する。図４に本実施形態にかかる携帯電話端末の構成を示す。
本実施形態にかかる携帯電話端末において、充電電流検出用抵抗部１２は、抵抗２４とスイッチ２５との組に加え、スイッチ３１と抵抗３０との組を備えている。これにより、本実施形態においてＣＰＵ１３は、充電電流検出用抵抗部１２の合成抵抗値を２ｂｉｔの値として制御する。 [Fourth Embodiment]
A fourth embodiment in which the present invention is preferably implemented will be described. FIG. 4 shows the configuration of the mobile phone terminal according to the present embodiment.
In the mobile phone terminal according to the present embodiment, the charging current detecting resistor 12 includes a pair of a switch 31 and a resistor 30 in addition to a pair of a resistor 24 and a switch 25. Accordingly, in the present embodiment, the CPU 13 controls the combined resistance value of the charging current detection resistor unit 12 as a 2-bit value.

第３の実施形態において説明したように、無線部３の送信部の出力電力はＣＰＵ１３によって数段階に制御される。出力電力が低下すれば無線部３の発熱量も低下するため、送信部の出力電力に応じて充電電流を切り替えれば、通話中の充電を安全かつ効率的に制御できる。   As described in the third embodiment, the output power of the transmission unit of the wireless unit 3 is controlled in several stages by the CPU 13. If the output power decreases, the amount of heat generated by the radio unit 3 also decreases. Therefore, if the charging current is switched according to the output power of the transmission unit, charging during a call can be controlled safely and efficiently.

ここでは、ＣＰＵ１３が充電電流検出用抵抗部１２の合成抵抗を２ｂｉｔの値として制御する場合を例に説明したが、スイッチと抵抗との組をさらに増やして合成抵抗を３ｂｉｔ以上の値として制御しても良い。   Here, the case where the CPU 13 controls the combined resistance of the charging current detection resistor unit 12 as a 2-bit value has been described as an example. However, the combination of switches and resistors is further increased to control the combined resistance as a value of 3 bits or more. May be.

なお、上記各実施形態は本発明の好適な実施の一例であり、本発明はこれに限定されることはない。
例えば、上記各実施形態においては、携帯型電子機器の例として携帯電話端末を上げているが、本発明は携帯電話端末以外の携帯型電子機器にも適用可能であり、上記各実施形態で例示した折り畳み型の端末構成に限定されることもない。
また、上記各実施形態では、通信部が発熱源となる場合を例に説明したが、発熱源はこれ以外の電子デバイスであっても構わない。カメラやスピーカ着信など大きく電力を消費する機能も増えており、これらの機能を実現する電子デバイスにおける発熱量も増加している。よって、上記各実施形態において発熱源として例示した無線部の代わりに撮像素子などの動作状態に応じて充電電流を切り替えることでも筐体表面の温度上昇を抑制できる。
このように、本発明は様々な変形が可能である。 Each of the above embodiments is an example of a preferred embodiment of the present invention, and the present invention is not limited to this.
For example, in each of the above embodiments, a mobile phone terminal is given as an example of the portable electronic device. However, the present invention can also be applied to a portable electronic device other than the mobile phone terminal, and is exemplified in each of the above embodiments. It is not limited to the foldable terminal configuration.
In each of the above embodiments, the case where the communication unit is a heat source has been described as an example. However, the heat source may be an electronic device other than this. Functions that consume a large amount of power, such as cameras and speaker calls, are increasing, and the amount of heat generated in electronic devices that realize these functions is also increasing. Therefore, the temperature rise on the surface of the housing can be suppressed by switching the charging current according to the operation state of the imaging element or the like instead of the wireless unit exemplified as the heat generation source in each of the above embodiments.
As described above, the present invention can be variously modified.

本発明を好適に実施した携帯電話端末の構成を示す図である。It is a figure which shows the structure of the mobile telephone terminal which implemented this invention suitably. 本発明を好適に実施した第２の実施形態にかかる携帯電話端末の構成を示す図である。It is a figure which shows the structure of the mobile telephone terminal concerning 2nd Embodiment which implemented this invention suitably. 本発明を好適に実施した第３の実施形態にかかる携帯電話端末の構成を示す図である。It is a figure which shows the structure of the mobile telephone terminal concerning 3rd Embodiment which implemented this invention suitably. 本発明を好適に実施した第４の実施形態にかかる携帯電話端末の構成を示す図である。It is a figure which shows the structure of the mobile telephone terminal concerning 4th Embodiment which implemented this invention suitably. 携帯電話端末の外観を示す図である。It is a figure which shows the external appearance of a mobile telephone terminal. 携帯電話端末の下側筐体内での機能部の配置例を示す図である。It is a figure which shows the example of arrangement | positioning of the function part in the lower side housing | casing of a mobile telephone terminal. 携帯電話端末の筐体表面温度の変化を表す図である。It is a figure showing the change of the housing | casing surface temperature of a mobile telephone terminal. 従来の携帯電話端末の構成を示す図である。It is a figure which shows the structure of the conventional mobile telephone terminal.

符号の説明Explanation of symbols

１ 充電部
２ 制御部
３ 無線部
４ 電池パック
５ 外部給電器
６ 充電制御回路
７ 出力制御スイッチ
８ 充電電流検出回路
９ 外部電圧検出回路
１０ 電池電圧検出回路
１１ 電池温度検出回路
１２ 充電電流検出用抵抗部
１３ ＣＰＵ
１４ 表示部
１５ 操作部
１６ 音声処理回路
１７ スピーカ
１８ マイク
１９ セル
２０ 温度検知器
２１ 充電端子
２２ 電池端子
２３、２４ｂ、３０ 抵抗
２５、３１ スイッチ
２６ 温度センサ
２７ 下側筐体
２８ 上側筐体 DESCRIPTION OF SYMBOLS 1 Charging part 2 Control part 3 Radio | wireless part 4 Battery pack 5 External power supply 6 Charging control circuit 7 Output control switch 8 Charging current detection circuit 9 External voltage detection circuit 10 Battery voltage detection circuit 11 Battery temperature detection circuit 12 Resistance for detection of charging current Part 13 CPU
DESCRIPTION OF SYMBOLS 14 Display part 15 Operation part 16 Audio | voice processing circuit 17 Speaker 18 Microphone 19 Cell 20 Temperature detector 21 Charging terminal 22 Battery terminal 23, 24b, 30 Resistance 25, 31 Switch 26 Temperature sensor 27 Lower housing 28 Upper housing

Claims (8)

発熱源となる電子デバイスを少なくとも一つ有し、装着された蓄電池を電力源として動作可能であり、前記蓄電池が装着されている状態で外部電源に接続された場合には、該外部電源から供給される電流で該蓄電池を充電する携帯型電子機器であって、
前記蓄電池を充電する際に前記発熱源のいずれかが作動している場合には、前記蓄電池を充電するための充電電流の電流値を前記発熱源がいずれも作動していない場合よりも小さくすることを特徴とする携帯型電子機器。 It has at least one electronic device to be a heat source, can be operated using the attached storage battery as a power source, and when connected to an external power supply with the storage battery attached, supplied from the external power supply A portable electronic device that charges the storage battery with a current that is
When any of the heat sources is operating when charging the storage battery, the current value of the charging current for charging the storage battery is made smaller than when none of the heat sources is operating. A portable electronic device characterized by that. 前記外部電源から供給される電流を検出するための抵抗部をさらに有し、
該抵抗部の抵抗値は少なくとも二つのいずれかに可変可能であり、該抵抗部における電圧降下に応じて前記充電電流の電流値を変化させることを特徴とする請求項１記載の携帯型電子機器。 A resistor for detecting a current supplied from the external power supply;
2. The portable electronic device according to claim 1, wherein the resistance value of the resistance portion can be changed to at least two, and the current value of the charging current is changed according to a voltage drop in the resistance portion. . 筐体の温度を測定する温度センサをさらに有し、該温度センサの検出する温度が所定値以上の場合にのみ前記充電電流を前記発熱源が非作動状態のときよりも小さくすることを特徴とする請求項１又は２記載の携帯型電子機器。   A temperature sensor for measuring the temperature of the housing is further included, and the charging current is made smaller than when the heat generation source is in an inactive state only when the temperature detected by the temperature sensor is equal to or higher than a predetermined value. The portable electronic device according to claim 1 or 2. 前記温度センサが、前記発熱源の近傍に設けられたことを特徴とする請求項３記載の携帯型電子機器。   The portable electronic device according to claim 3, wherein the temperature sensor is provided in the vicinity of the heat source. 装着された蓄電池を電力源として動作可能であり、前記蓄電池が装着されている状態で外部電源に接続された場合には、該外部電源から供給される電流で該蓄電池を充電する移動体通信端末であって、
通信状態にあるときに、前記蓄電池を充電するための充電電流の電流値を非通信状態にあるときよりも小さくすることを特徴とする移動体通信端末。 A mobile communication terminal that can operate using a mounted storage battery as a power source and charges the storage battery with a current supplied from the external power supply when the storage battery is connected to an external power supply Because
A mobile communication terminal characterized in that, when in a communication state, a current value of a charging current for charging the storage battery is made smaller than that in a non-communication state. 前記外部電源から供給される電流を検出するための抵抗部をさらに有し、
該抵抗部の抵抗値は少なくとも二つの値のいずれかに可変可能であり、該抵抗部における電圧降下に応じて前記充電電流の電流値を変化させることを特徴とする請求項５記載の移動体通信端末。 A resistor for detecting a current supplied from the external power supply;
6. The moving body according to claim 5, wherein the resistance value of the resistance portion is variable to at least two values, and the current value of the charging current is changed according to a voltage drop in the resistance portion. Communication terminal. 筐体の温度を測定する温度センサをさらに有し、該温度センサの検出する温度が所定値以上の場合にのみ前記充電電流を非通信状態よりも小さくすることを特徴とする請求項５又は６記載の移動体通信端末。   A temperature sensor for measuring the temperature of the housing is further provided, and the charging current is made smaller than that in the non-communication state only when the temperature detected by the temperature sensor is equal to or higher than a predetermined value. The mobile communication terminal described. 前記温度センサが、移動体通信用の信号を送受信するための通信部の近傍に設けられたことを特徴とする請求項７記載の移動体通信端末。   The mobile communication terminal according to claim 7, wherein the temperature sensor is provided in the vicinity of a communication unit for transmitting and receiving a signal for mobile communication.
JP2005085623A 2004-04-22 2005-03-24 Portable electronic device and mobile communication terminal Expired - Fee Related JP4463131B2 (en)

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