JP2007228701A - Portable terminal device - Google Patents

Portable terminal device Download PDF

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JP2007228701A
JP2007228701A JP2006045947A JP2006045947A JP2007228701A JP 2007228701 A JP2007228701 A JP 2007228701A JP 2006045947 A JP2006045947 A JP 2006045947A JP 2006045947 A JP2006045947 A JP 2006045947A JP 2007228701 A JP2007228701 A JP 2007228701A
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voltage
charging
target voltage
secondary battery
current
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JP4675797B2 (en
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Hiromoto Jinnouchi
宏基 陣之内
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Sharp 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
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10—Energy storage using batteries

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal device that can safely perform charging up to a sufficient charging capacity. <P>SOLUTION: The temperature of a secondary battery 2 is indirectly detected by detecting a load current by a load current detector 8 during the charging of the secondary battery 2. A charge control unit 5 applies a charge target voltage set by a target voltage setting part 6 to the secondary battery 2 on the basis of the load current, and terminates the voltage application on the basis of a battery current detected by a battery current detector 7. By this, a voltage as high as possible can be applied while preventing the secondary battery 2 from being swollen due to a high temperature by applying a voltage while taking into account the temperature of the secondary battery 2. Also, since the voltage application is terminated on the basis of the battery current, overcharge can surely be protected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、携帯端末装置に係り、さらに詳しくは、二次電池からの電源供給により駆動可能な携帯端末装置に関する。   The present invention relates to a mobile terminal device, and more particularly to a mobile terminal device that can be driven by power supply from a secondary battery.

携帯端末装置の二次電池に対して充電を行うための充電システムとして、二次電池の放電状態に応じて充電モードを切り替えることができるような構成（例えば、特許文献１）や、被給電機器の動作信号に基づいて設定電圧を切り替えるような構成（例えば、特許文献２）が提案されている。   As a charging system for charging a secondary battery of a mobile terminal device, a configuration (for example, Patent Document 1) that can switch a charging mode according to a discharge state of the secondary battery, or a power-supplied device A configuration is proposed in which the set voltage is switched based on the operation signal (for example, Patent Document 2).

図６は、従来の充電システムの構成例を示したブロック図である。この充電システムは、特許文献２に開示されている構成と同様の構成からなり、電源端子１０１に外部から供給される電流が、充電電圧又は充電電流が一定となるようにリミッタ１０３によって制限され、ＦＥＴなどにより構成される電流調整素子１０４や、充電電流検出部１０６を介して、二次電池１０７に供給されるようになっている。充電制御部１０５には、外部供給充電電流検出信号１１１、電池電圧検出信号１１２、及び、電圧設定部１０８の設定電圧信号１１３が入力され、これらの信号に基づいて、電流調整素子１０４を制御することによって外部供給充電電流Ｉａが制御される。   FIG. 6 is a block diagram showing a configuration example of a conventional charging system. This charging system has the same configuration as that disclosed in Patent Document 2, and the current supplied from the outside to the power supply terminal 101 is limited by the limiter 103 so that the charging voltage or charging current is constant, It is supplied to the secondary battery 107 via a current adjusting element 104 constituted by an FET or the like and a charging current detection unit 106. The charging control unit 105 receives the externally supplied charging current detection signal 111, the battery voltage detection signal 112, and the setting voltage signal 113 of the voltage setting unit 108, and controls the current adjustment element 104 based on these signals. As a result, the externally supplied charging current Ia is controlled.

一般に、二次電池の定電圧充電は、二次電池に供給される充電電流Ｉｃが規定値以下まで低下すれば終了し、あるいは、充電中の充電目標電圧と、充電中に一度充電を停止し、電池電圧を監視し、双方の電圧差がある閾値以下になれば終了する。この充電システムでは、外部供給充電電流Ｉａを検出しているため、外部供給充電電流Ｉａを規定値と比較することにより定電圧充電を終了している。しかしながら、被給電機器１２０を使用しながら二次電池１０７の充電を行う場合には、電源端子１０１に外部から供給される外部供給充電電流Ｉａは、二次電池１０７だけでなく被給電機器１２０にも供給される。この場合、被給電機器１２０に負荷電流Ｉｂが供給されるため、二次電池１０７に供給される充電電流Ｉｃは、Ｉｃ＝Ｉａ−Ｉｂとなる。したがって、被給電機器１２０に負荷電流Ｉｂが供給された状態では、二次電池１０７が満充電となって充電電流Ｉｃが規定値以下まで低下していることを、充電電流検出部１０６で検出される外部供給充電電流Ｉａ（＝Ｉｂ＋Ｉｃ）に基づいて検出することができず、過充電となってしまうおそれがある。   In general, the constant voltage charging of the secondary battery is terminated when the charging current Ic supplied to the secondary battery drops below a specified value, or the charging target voltage during charging and the charging once stopped during charging. The battery voltage is monitored, and the process ends when the voltage difference between the two falls below a certain threshold. In this charging system, since the externally supplied charging current Ia is detected, the constant voltage charging is terminated by comparing the externally supplied charging current Ia with a specified value. However, when charging the secondary battery 107 while using the power-supplied device 120, the externally supplied charging current Ia supplied from the outside to the power supply terminal 101 is supplied not only to the secondary battery 107 but also to the power-supplied device 120. Is also supplied. In this case, since the load current Ib is supplied to the power-supplied device 120, the charging current Ic supplied to the secondary battery 107 is Ic = Ia−Ib. Therefore, in a state where the load current Ib is supplied to the power-supplied device 120, the charging current detecting unit 106 detects that the secondary battery 107 is fully charged and the charging current Ic is reduced to a specified value or less. May not be detected based on the externally supplied charging current Ia (= Ib + Ic).

そこで、被給電機器１２０の動作信号１１７、例えば電源スイッチ（図示せず）の状態に基づき、電圧設定部１０８のスイッチ１１６を切り替えることにより、被給電機器１２０の非動作時には、第１設定部１１４から二次電池１０７の満充電電圧値を電圧設定値として出力し、被給電機器１２０の動作時には、第２設定部１１５から満充電電圧値よりも小さい電圧設定値を出力することとしている。これにより、二次電池１０７の充電時に被給電機器１２０に大きな負荷電流が流れても、充電電圧が満充電電圧以下で制御されるため、過充電となるのを防止できるようになっている。
特開平２−９７２３２号公報 特開２００２−３４１７３号公報 Therefore, by switching the switch 116 of the voltage setting unit 108 based on the operation signal 117 of the power-supplied device 120, for example, the state of a power switch (not shown), the first setting unit 114 when the power-supplied device 120 is not operating. The full charge voltage value of the secondary battery 107 is output as a voltage set value, and when the powered device 120 is operated, a voltage set value smaller than the full charge voltage value is output from the second setting unit 115. As a result, even when a large load current flows through the power-supplied device 120 when the secondary battery 107 is charged, the charge voltage is controlled to be equal to or lower than the full charge voltage, so that overcharging can be prevented.
Japanese Patent Laid-Open No. 2-97232 JP 2002-34173 A

被給電機器の動作時中に充電を行った場合、負荷電流の増大に伴って二次電池が加熱され膨張する場合がある。このような二次電池の膨張は、高電圧充電状態かつ高温（約４０℃以上）の状況下において電池内部の正極、負極への化学物質の堆積物付着が原因であると考えられる。従って、二次電池が膨張した状態で更に高電圧による充電を続けることは安全上好ましくなく、二次電池の温度に基づいて電圧設定値を変更することが好ましい。   When charging is performed during operation of the power-supplied device, the secondary battery may be heated and expand as the load current increases. Such expansion of the secondary battery is considered to be caused by deposits of chemical substances on the positive electrode and the negative electrode inside the battery in a high voltage charged state and a high temperature (about 40 ° C. or higher). Therefore, it is not preferable for safety to continue charging with a higher voltage in a state where the secondary battery is expanded, and it is preferable to change the voltage setting value based on the temperature of the secondary battery.

上記のような従来技術では、被給電機器が動作しているか否かに基づいて電圧設定値を変更しているが、二次電池の温度に基づいて電圧値を変更するような構成ではない。そのため、被給電機器が動作しているときには、二次電池が高温になっていなくても電圧設定値が低く設定され、十分な充電容量まで充電を行うことができないこととなる。   In the prior art as described above, the voltage setting value is changed based on whether or not the power-supplied device is operating, but the voltage value is not changed based on the temperature of the secondary battery. Therefore, when the power-supplied device is operating, the voltage set value is set low even if the secondary battery is not at a high temperature, and charging cannot be performed to a sufficient charge capacity.

本発明は、上記の事情に鑑みてなされたものであり、十分な充電容量まで安全に充電を行うことができる携帯端末装置を提供することを目的とする。   This invention is made | formed in view of said situation, and it aims at providing the portable terminal device which can charge safely to sufficient charge capacity.

第１の本発明による携帯端末装置は、二次電池から電源供給され、上記二次電池の充電中に駆動可能な負荷回路と、充電中の上記二次電池へ流入する電池電流を検出する電池電流検出手段と、上記二次電池に対して充電目標電圧を印加し、上記電池電流に基づいて電圧印加を終了する充電制御手段と、充電中における上記二次電池の温度を検出する電池温度検出手段と、上記電池温度検出手段による検出結果に基づいて、上記充電目標電圧を設定する目標電圧設定手段とを備えて構成される。   According to a first aspect of the present invention, there is provided a portable terminal device that is supplied with power from a secondary battery and that can be driven during charging of the secondary battery, and a battery that detects a battery current flowing into the secondary battery being charged. A current detection means; a charge control means for applying a charging target voltage to the secondary battery and terminating the voltage application based on the battery current; and a battery temperature detection for detecting the temperature of the secondary battery during charging. And a target voltage setting means for setting the charging target voltage based on the detection result by the battery temperature detecting means.

このような構成により、二次電池の充電中は、二次電池の温度に基づいて充電目標電圧を印加し、電池電流に基づいて電圧印加を終了することができる。このように、二次電池の温度を考慮して電圧を印加することにより、二次電池が高温になって膨張するのを防止しつつ、できるだけ高い電圧を印加することができる。また、電池電流に基づいて電圧印加を終了するので、過充電となるのを確実に防止できる。したがって、十分な充電容量まで安全に充電を行うことができる。なお、充電目標電圧は、充電終止電圧と読み替えてもよい。   With such a configuration, during charging of the secondary battery, the charging target voltage can be applied based on the temperature of the secondary battery, and the voltage application can be terminated based on the battery current. In this way, by applying the voltage in consideration of the temperature of the secondary battery, it is possible to apply as high a voltage as possible while preventing the secondary battery from becoming hot and expanding. Moreover, since the voltage application is terminated based on the battery current, it is possible to reliably prevent overcharging. Therefore, it is possible to safely charge up to a sufficient charge capacity. Note that the charge target voltage may be read as a charge end voltage.

第２の本発明による携帯端末装置において、上記電池温度検出手段は、上記負荷回路へ流入する負荷電流を検出する負荷電流検出手段からなる。   In the portable terminal device according to the second aspect of the present invention, the battery temperature detecting means comprises load current detecting means for detecting a load current flowing into the load circuit.

このような構成により、負荷回路へ流入する負荷電流に基づいて二次電池の温度を検出し、充電目標電圧値を設定することができる。これにより、簡易な方法で二次電池の温度を検出することができるので、構成を簡略化でき、製造コストを低減できる。また、負荷電流を監視することにより、携帯端末装置自身の温度上昇を予見することが可能となる。すなわち、温度の上昇及び下降は時間経過を伴うものであり、負荷電流を監視すれば、瞬間的な動作状態を把握することができ、将来の温度を予測するのに好適である。   With such a configuration, the temperature of the secondary battery can be detected based on the load current flowing into the load circuit, and the charge target voltage value can be set. Thereby, since the temperature of a secondary battery can be detected with a simple method, a structure can be simplified and manufacturing cost can be reduced. Further, by monitoring the load current, it is possible to foresee the temperature rise of the mobile terminal device itself. That is, the rise and fall of the temperature is accompanied by the passage of time, and if the load current is monitored, the instantaneous operation state can be grasped, which is suitable for predicting the future temperature.

第３の本発明による携帯端末装置において、上記目標電圧設定手段は、負荷電流を所定の閾値と比較し、負荷電流が上記閾値以上の場合に充電目標電圧を第１電圧値に設定し、負荷電流が上記閾値未満の場合に充電目標電圧を上記第１電圧値よりも高い第２電圧値に設定する。   In the portable terminal device according to the third aspect of the present invention, the target voltage setting means compares the load current with a predetermined threshold, sets the charge target voltage to the first voltage value when the load current is equal to or greater than the threshold, When the current is less than the threshold value, the charging target voltage is set to a second voltage value higher than the first voltage value.

このような構成により、負荷電流が閾値以上で、二次電池が高温になりやすい状態のときには、充電目標電圧を比較的低い第１電圧値に設定し、負荷電流が閾値未満で、二次電池が高温になりにくい状態のときには、充電目標電圧を比較的高い第２電圧値に設定することができる。したがって、負荷電流が閾値以上のときには、二次電池が加熱されるのを抑制して安全に充電を行い、負荷電流が閾値未満のときには、できるだけ高い電圧を印加して十分な充電容量まで充電を行うことができる。   With such a configuration, when the load current is equal to or higher than the threshold value and the secondary battery is likely to be at a high temperature, the charging target voltage is set to a relatively low first voltage value. When it is difficult for the temperature to become high, the charge target voltage can be set to a relatively high second voltage value. Therefore, when the load current is greater than or equal to the threshold value, the secondary battery is prevented from being heated and charged safely, and when the load current is less than the threshold value, a voltage as high as possible is applied to charge to a sufficient charge capacity. It can be carried out.

第４の本発明による携帯端末装置において、上記充電制御手段は、上記第１電圧値を充電目標電圧として電圧印加が終了した後、一定時間内に負荷電流が上記閾値未満になった場合に、上記二次電池に対する電圧印加を再開し、上記目標電圧設定手段は、再開した電圧印加の充電目標電圧を上記第２電圧値に設定する。   In the portable terminal device according to the fourth aspect of the present invention, the charge control means, when the load current becomes less than the threshold value within a predetermined time after the voltage application is finished with the first voltage value as the charge target voltage, The voltage application to the secondary battery is restarted, and the target voltage setting means sets the restarted charging target voltage of the voltage application to the second voltage value.

このような構成により、比較的小さい第１電圧値を充電目標電圧として電圧印加が終了した場合、その後の一定時間内に負荷電流が閾値未満となれば、比較的高い第２電圧値を充電目標電圧として電圧印加を再開することができる。したがって、充電目標電圧が低く十分な充電容量まで充電されなかった場合であっても、その後に高い電圧値で十分に充電を行うことができる。   With such a configuration, when voltage application is completed using a relatively small first voltage value as a charge target voltage, a relatively high second voltage value is set to a charge target if the load current becomes less than a threshold value within a certain period thereafter. The voltage application can be resumed as the voltage. Therefore, even if the charging target voltage is low and the battery has not been charged to a sufficient charging capacity, it can be sufficiently charged with a high voltage value thereafter.

第５の本発明による携帯端末装置において、上記負荷電流検出手段は、一定時間内に負荷電流を複数回検出するものであり、上記目標電圧設定手段は、上記第１電圧値を充電目標電圧として電圧を印加しているときに、上記複数回の負荷電流の検出結果がすべて上記閾値未満になった場合に、充電目標電圧を上記第２電圧値に切り替え、上記第２電圧値を充電目標電圧として電圧を印加しているときに、上記複数回の負荷電流の検出結果が１回でも上記閾値以上になった場合に、充電目標電圧を上記第１電圧値に切り替える。   In the portable terminal device according to the fifth aspect of the present invention, the load current detecting means detects the load current a plurality of times within a predetermined time, and the target voltage setting means uses the first voltage value as a charging target voltage. When a voltage is applied, if the detection results of the plurality of load currents are all less than the threshold value, the charging target voltage is switched to the second voltage value, and the second voltage value is changed to the charging target voltage. When the voltage is applied as described above, the charging target voltage is switched to the first voltage value when the detection result of the plurality of load currents exceeds the threshold even once.

このような構成により、一定時間内に複数回の負荷電流の検出結果がすべて閾値未満となったときにのみ、充電目標電圧を第１電圧値から第２電圧値へ切り替え、一定時間内に複数回の負荷電流の検出結果が１回でも閾値以上となったときには、充電目標電圧を第２電圧値から第１電圧値へ切り替えることができる。これにより、負荷電流の減少が確実な場合にのみ充電目標電圧を切り替えることができるので、安全性がさらに向上する。   With such a configuration, the charging target voltage is switched from the first voltage value to the second voltage value only when the detection results of a plurality of load currents are all less than the threshold value within a certain time, and a plurality of times within a certain time. When the detection result of one load current is equal to or greater than the threshold even once, the charging target voltage can be switched from the second voltage value to the first voltage value. As a result, the charging target voltage can be switched only when the decrease in the load current is certain, thus further improving safety.

第６の本発明による携帯端末装置において、上記負荷電流検出手段は、一定時間内に負荷電流を複数回検出するものであり、上記目標電圧設定手段は、上記第１電圧値を充電目標電圧として印加しているときに、上記複数回の負荷電流の平均値が上記閾値未満になった場合に、充電目標電圧を上記第２電圧値に切り替え、上記第２電圧値を充電目標電圧として印加しているときに、上記複数回の負荷電流の平均値が上記閾値以上になった場合に、充電目標電圧を上記第１電圧値に切り替える。これにより、負荷電流の減少又は増大が確実な場合にのみ充電目標電圧を切り替えることができるので、安全性がさらに向上する。   In the portable terminal device according to the sixth aspect of the present invention, the load current detecting means detects the load current a plurality of times within a predetermined time, and the target voltage setting means uses the first voltage value as a charging target voltage. If the average value of the plurality of load currents is less than the threshold value during application, the charge target voltage is switched to the second voltage value, and the second voltage value is applied as the charge target voltage. When the average value of the plurality of load currents exceeds the threshold value, the charging target voltage is switched to the first voltage value. As a result, the charging target voltage can be switched only when the decrease or increase of the load current is certain, and the safety is further improved.

本発明によれば、二次電池の温度を考慮して電圧を印加することにより、二次電池が高温になって膨張するのを防止しつつ、できるだけ高い電圧を印加することができる。また、電池電流に基づいて電圧印加を終了するので、過充電となるのを確実に防止できる。したがって、十分な充電容量まで安全に充電を行うことができる。   According to the present invention, by applying a voltage in consideration of the temperature of the secondary battery, it is possible to apply as high a voltage as possible while preventing the secondary battery from becoming hot and expanding. Moreover, since the voltage application is terminated based on the battery current, it is possible to reliably prevent overcharging. Therefore, it is possible to safely charge up to a sufficient charge capacity.

図１は、本発明の実施の形態による携帯端末装置の一例を示したブロック図であり、携帯端末装置の一例として携帯電話機１が示されている。この携帯電話機１は、リチウムイオン電池などの二次電池２が着脱可能に取り付けられており、この二次電池２からの電源供給により動作できるようになっている。携帯電話機１の動作時には、携帯電話機１に備えられた負荷回路３が二次電池２からの電源供給により駆動される。   FIG. 1 is a block diagram illustrating an example of a mobile terminal device according to an embodiment of the present invention, in which a mobile phone 1 is illustrated as an example of the mobile terminal device. The mobile phone 1 is removably attached with a secondary battery 2 such as a lithium ion battery, and can be operated by supplying power from the secondary battery 2. During the operation of the mobile phone 1, the load circuit 3 provided in the mobile phone 1 is driven by power supply from the secondary battery 2.

携帯電話機１には、コネクタ（図示せず）を介して充電器４を接続することができるようになっている。この充電器４を介して外部から携帯電話機１に電源を供給することにより、携帯電話機１に取り付けられている二次電池２の充電を行うことができる。ここで、充電器４は、携帯電話機１を保持した状態で接続端子を携帯電話機１に電気的に接続させるホルダと、ホルダの接続端子に配線を介して接続されるＡＣアダプタとからなるような構成であってもよいし、携帯電話機１に配線を介して直接接続されるＡＣアダプタからなるような構成であってもよい。   The mobile phone 1 can be connected to a charger 4 via a connector (not shown). By supplying power to the mobile phone 1 from the outside via the charger 4, the secondary battery 2 attached to the mobile phone 1 can be charged. Here, the charger 4 includes a holder that electrically connects the connection terminal to the mobile phone 1 while holding the mobile phone 1, and an AC adapter that is connected to the connection terminal of the holder via a wiring. A configuration may be used, or a configuration including an AC adapter directly connected to the mobile phone 1 via a wiring may be used.

携帯電話機１には、充電制御部５、目標電圧設定部６、電池電流検出部７及び負荷電流検出部８が備えられている。充電制御部５には、充電器４から電流が流入するようになっており、二次電池２に供給する電流量が充電制御部５により制御される。より具体的には、充電制御部５は、一定の充電目標電圧を印加する定電圧充電や、目標電流に近づくように電圧を印加する定電流充電により、二次電池２に対する充電を行うことができる。充電時の充電目標電圧は、目標電圧設定部６から入力される。   The mobile phone 1 includes a charge control unit 5, a target voltage setting unit 6, a battery current detection unit 7, and a load current detection unit 8. A current flows from the charger 4 into the charging controller 5, and the amount of current supplied to the secondary battery 2 is controlled by the charging controller 5. More specifically, the charging control unit 5 can charge the secondary battery 2 by constant voltage charging that applies a constant charging target voltage or constant current charging that applies a voltage so as to approach the target current. it can. The charging target voltage at the time of charging is input from the target voltage setting unit 6.

充電制御部５と二次電池２を電気的に接続する経路の途中には分岐点９が形成され、この分岐点９から負荷回路３へ経路が分岐している。これにより、負荷回路３は、充電中であっても二次電池２からの電源供給を受けて駆動することができるようになっている。電池電流検出部７は、分岐点９よりも二次電池２側の経路に設けられ、二次電池２へ流入する電流（以下、「電池電流」と呼ぶ。）を検出する。一方、負荷電流検出部８は、分岐点９よりも負荷回路３側の経路に設けられ、負荷回路３へ流入する電流（以下、「負荷電流」と呼ぶ。）を検出する。   A branch point 9 is formed in the middle of a path for electrically connecting the charge control unit 5 and the secondary battery 2, and the path branches from the branch point 9 to the load circuit 3. Thereby, the load circuit 3 can be driven by receiving power supply from the secondary battery 2 even during charging. The battery current detection unit 7 is provided in a path closer to the secondary battery 2 than the branch point 9 and detects a current flowing into the secondary battery 2 (hereinafter referred to as “battery current”). On the other hand, the load current detector 8 is provided in the path closer to the load circuit 3 than the branch point 9 and detects a current flowing into the load circuit 3 (hereinafter referred to as “load current”).

携帯電話機１の動作時には、負荷電流の増大に伴って、二次電池２が周囲の回路部品により加熱される。したがって、負荷電流を検出することにより、二次電池２の周囲温度を間接的に算出することができる。すなわち、本実施の形態において、負荷電流検出部８は、二次電池２の温度を検出する電池温度検出手段として機能している。負荷電流検出部８における検出結果は目標電圧設定部６に入力され、目標電圧設定部６は、入力された検出結果に基づいて充電目標電圧を設定することとなる。   During the operation of the mobile phone 1, the secondary battery 2 is heated by the surrounding circuit components as the load current increases. Therefore, the ambient temperature of the secondary battery 2 can be indirectly calculated by detecting the load current. That is, in the present embodiment, the load current detection unit 8 functions as a battery temperature detection unit that detects the temperature of the secondary battery 2. The detection result in the load current detection unit 8 is input to the target voltage setting unit 6, and the target voltage setting unit 6 sets the charging target voltage based on the input detection result.

電池電流検出部７における検出結果は、充電制御部５に入力される。充電制御部５は、電池電流検出部７からの検出結果に基づいて充電電圧印加を終了することにより、二次電池２に対する充電を終了することができる。充電制御部５は、分岐点９と二次電池２の間の経路にも接続されており、二次電池２に対する印加電圧（以下、「電池電圧」と呼ぶ。）を検出することができるようになっている。   The detection result in the battery current detection unit 7 is input to the charge control unit 5. The charging control unit 5 can end the charging of the secondary battery 2 by ending the charging voltage application based on the detection result from the battery current detecting unit 7. The charging control unit 5 is also connected to a path between the branch point 9 and the secondary battery 2 so that an applied voltage to the secondary battery 2 (hereinafter referred to as “battery voltage”) can be detected. It has become.

図２は、充電制御部５による二次電池２に対する充電時の制御の一例を示したフローチャートである。充電器４から電源が供給されることにより充電が開始されると、まず、予備充電として、目標電流を８０ｍＡとした定電流充電が行われる（ステップＳ１０１）。予備充電は、電池電圧が所定値、例えば３．０Ｖ以上になるまで行われる。電池電圧が３．０Ｖ以上になると（ステップＳ１０２でＹｅｓ）、予備充電時よりも高い電流値を目標電流として定電流充電が行われる（ステップＳ１０３）。   FIG. 2 is a flowchart showing an example of control at the time of charging the secondary battery 2 by the charge control unit 5. When charging is started by supplying power from the charger 4, first, constant current charging with a target current of 80 mA is performed as preliminary charging (step S101). The preliminary charging is performed until the battery voltage reaches a predetermined value, for example, 3.0 V or more. When the battery voltage becomes 3.0 V or higher (Yes in step S102), constant current charging is performed using a higher current value than that during preliminary charging as a target current (step S103).

本実施の形態では、定電流充電（ステップＳ１０３）の目標電流は６５０ｍＡに設定されている。ただし、定電流充電の目標電流は、上記電流値に限定されるものではなく、上記電流値とは異なる電流値であってもよい。また、１つの目標電流に基づいて１回だけ定電流充電を行うような構成に限らず、目標電流の異なる定電流充電を順次に２回以上行うような構成であってもよい。   In the present embodiment, the target current for constant current charging (step S103) is set to 650 mA. However, the target current for constant current charging is not limited to the current value, and may be a current value different from the current value. In addition, the configuration is not limited to performing constant current charging only once based on one target current, but may be configured to perform constant current charging with different target currents two or more times sequentially.

定電流充電中、二次電池２の充電容量が小さい間は、設定した目標電流に達するように電圧を印加することができるが、充電容量が大きくなってくると、二次電池２へ流入する電池電流が目標電流に到達できず、徐々に低下することとなる。そこで、電池電流が２４０ｍＡ以下まで低下した場合には（ステップＳ１０４でＹｅｓ）、二次電池２に対する充電態様が定電流充電から定電圧充電に切り替えられるようになっている（ステップＳ１０５）。   While the charging capacity of the secondary battery 2 is small during constant current charging, a voltage can be applied to reach the set target current, but when the charging capacity increases, it flows into the secondary battery 2. The battery current cannot reach the target current and gradually decreases. Therefore, when the battery current decreases to 240 mA or less (Yes in step S104), the charging mode for the secondary battery 2 is switched from constant current charging to constant voltage charging (step S105).

図３は、定電圧充電時の制御の一例を示したフローチャートである。図３に示すように、定電圧充電中は、定期的に負荷電流が測定され、その測定された負荷電流に基づいて、充電目標電圧が２段階に切り替えられるようになっている。   FIG. 3 is a flowchart illustrating an example of control during constant voltage charging. As shown in FIG. 3, during constant voltage charging, the load current is periodically measured, and the charging target voltage is switched in two stages based on the measured load current.

より具体的に説明すると、定電圧充電中は、例えば６４０ｍｓが経過するごとに（ステップＳ２０１でＹｅｓ）、負荷電流が測定される（ステップＳ２０２）。そして、一定時間、例えば３０ｓが経過すると（ステップＳ２０３でＹｅｓ）、３０ｓ間に測定された複数回の負荷電流の検出結果を、所定の閾値と比較する。本実施の形態において、上記閾値は２００ｍＡである。   More specifically, during constant voltage charging, for example, every time 640 ms elapses (Yes in step S201), the load current is measured (step S202). Then, when a predetermined time, for example, 30 s elapses (Yes in step S203), the detection result of the load current measured a plurality of times during 30 s is compared with a predetermined threshold value. In the present embodiment, the threshold value is 200 mA.

複数回の負荷電流の検出結果が１回でも２００ｍＡ以上であった場合には（ステップＳ２０４でＹｅｓ）、充電目標電圧が比較的低い第１電圧値、例えば４．２Ｖに設定される（ステップＳ２０５）。複数回の負荷電流の検出結果がすべて２００ｍＡ未満であった場合には（ステップＳ２０４でＮｏ）、充電目標電圧が比較的高い第２電圧値、例えば４．４Ｖに設定される（ステップＳ２０６）。よって、複数回の負荷電流の検出結果に、２００ｍＡ以上の値と、２００ｍＡ未満の値とが含まれる場合には充電目標電圧は比較的低い第１電圧値のままとなる。   If the detection result of the plurality of load currents is 200 mA or more even once (Yes in step S204), the charging target voltage is set to a relatively low first voltage value, for example, 4.2 V (step S205). ). If the detection results of the plurality of load currents are all less than 200 mA (No in step S204), the charging target voltage is set to a relatively high second voltage value, for example, 4.4 V (step S206). Therefore, when the load current detection results include a value of 200 mA or more and a value of less than 200 mA, the charging target voltage remains at a relatively low first voltage value.

このように、定電圧充電中は、負荷電流に基づいて充電目標電圧が切り替えられ、電池電流が規定値以下、例えば５０ｍＡ以下になると（ステップＳ２０７でＹｅｓ）、定電圧充電が終了する。ただし、定電圧充電の充電目標電圧は、上記電圧値に限定されるものではなく、上記電圧値とは異なる電圧値であってもよい。また、充電目標電圧は２段階に限らず、負荷電流と比較する閾値を２以上設定して、充電目標電圧を３段階以上に切り替えることができるような構成としてもよい。   Thus, during the constant voltage charging, the charging target voltage is switched based on the load current, and when the battery current becomes equal to or less than a specified value, for example, 50 mA or less (Yes in step S207), the constant voltage charging ends. However, the charge target voltage for constant voltage charging is not limited to the voltage value, and may be a voltage value different from the voltage value. Further, the charging target voltage is not limited to two stages, and a configuration may be adopted in which a threshold value to be compared with the load current is set to two or more and the charging target voltage can be switched to three or more stages.

また、図３では、３０秒間に検出された複数回の負荷電流が、全て２００ｍＡ未満であるか否かに基づいて充電目標電圧の切り替えを行っているが、３０秒間に検出された複数回の負荷電流の平均値に基づいて、充電目標電圧の切り替えを行ってもよい。すなわち、３０秒間に検出された複数回の負荷電流の平均値を求めて閾値と比較し、この平均値が閾値未満であれば充電目標電圧を第２電圧値に切り替え、閾値以上であれば充電目標電圧を第１電圧値に切り替えるように構成することもできる。この場合、負荷電流の減少又は増大が確実な場合にのみ充電目標電圧を切り替えることができる。   Further, in FIG. 3, the charging target voltage is switched based on whether or not the load currents detected for 30 seconds are all less than 200 mA, but the multiple times detected for 30 seconds. The charging target voltage may be switched based on the average value of the load current. That is, the average value of the load currents detected multiple times in 30 seconds is obtained and compared with a threshold value. If this average value is less than the threshold value, the charging target voltage is switched to the second voltage value, and if it is equal to or greater than the threshold value, charging is performed. It can also be configured to switch the target voltage to the first voltage value. In this case, the charging target voltage can be switched only when the load current is surely reduced or increased.

再び図２を参照して、定電圧充電が終了すると（ステップＳ１０５）、二次電池２に対する電圧印加が停止されることにより、充電が終了する（ステップＳ１０６）。このとき、充電目標電圧を４．４Ｖとした定電圧充電中に充電が終了した場合には（ステップＳ１０７でＮｏ）、その後に充電が再開されることはないが、充電目標電圧を４．２Ｖとした定電圧充電中に充電が終了した場合には（ステップＳ１０７でＹｅｓ）、一定の待機期間内に負荷電流が上記閾値未満になったことを条件として、充電が再開されるようになっている。   Referring to FIG. 2 again, when the constant voltage charging is completed (step S105), the charging is terminated by stopping the voltage application to the secondary battery 2 (step S106). At this time, when charging is completed during constant voltage charging with the charging target voltage set to 4.4V (No in step S107), charging is not resumed thereafter, but the charging target voltage is set to 4.2V. When the charging is completed during the constant voltage charging (Yes in step S107), the charging is resumed on the condition that the load current becomes less than the threshold value within a certain standby period. Yes.

すなわち、待機期間として３０ｍｉｎが経過するまでに（ステップＳ１０８でＮｏ）、負荷電流が２００ｍＡ未満になった場合には（ステップＳ１０９でＹｅｓ）、充電目標電圧が４．４Ｖに設定され（ステップＳ１１０）、定電流充電が行われた後（ステップＳ１０３）、電池電流が２４０ｍＡ以下まで低下すると（ステップＳ１０４でＹｅｓ）、設定された４．４Ｖの充電目標電圧で定電圧充電が行われる（ステップＳ１０５）。   That is, when the load current becomes less than 200 mA by the time 30 minutes elapses as the standby period (No in Step S109), the charging target voltage is set to 4.4 V (Step S110). After the constant current charging is performed (step S103), when the battery current decreases to 240 mA or less (Yes in step S104), the constant voltage charging is performed with the set charging target voltage of 4.4V (step S105). .

図４は、充電が再開される場合の電池電圧及び電池電流の変化を概略的に示したタイミングチャートである。この図４に示すように、充電が開始されると、まず、目標電流が８０ｍＡの予備充電が行われた後、目標電流を６５０ｍＡとして定電流充電が行われる。その後、充電容量が大きくなってくると、電池電流が目標電流に到達できず徐々に低下し、電池電流が２４０ｍＡ以下まで低下すると、充電目標電圧を４．２Ｖとした定電圧充電に切り替わる。   FIG. 4 is a timing chart schematically showing changes in battery voltage and battery current when charging is resumed. As shown in FIG. 4, when charging is started, first, preliminary charging with a target current of 80 mA is performed, and then constant current charging is performed with a target current of 650 mA. Thereafter, when the charging capacity increases, the battery current cannot reach the target current and gradually decreases. When the battery current decreases to 240 mA or less, the charging is switched to constant voltage charging with the charging target voltage set to 4.2V.

充電中に携帯電話機１を使用している場合のように、負荷回路３が常に駆動しているような状態では、負荷電流が常に２００ｍＡ以上となる場合がある。このような場合には、図４に示すように、定電圧充電中に充電目標電圧が４．２Ｖから４．４Ｖに切り替えられずに、４．２Ｖの充電目標電圧のまま定電圧充電が終了することとなる。４．２Ｖの充電目標電圧で定電圧充電が終了したとき、二次電池２の充電容量は７５０ｍＡｈ程度となる。   When the load circuit 3 is always driven as in the case where the mobile phone 1 is used during charging, the load current may always be 200 mA or more. In such a case, as shown in FIG. 4, the constant voltage charging is terminated while the charging target voltage is 4.2 V without being switched from 4.2 V to 4.4 V during constant voltage charging. Will be. When constant voltage charging is completed at a charging target voltage of 4.2 V, the charging capacity of the secondary battery 2 is about 750 mAh.

このように、充電目標電圧を４．２Ｖとして定電圧充電が終了した場合には、その後の待機期間内に負荷電流が閾値未満になったことを条件として、充電が再開される。充電が再開されると、まず、目標電流を６５０ｍＡとして定電流充電が行われる。このとき、二次電池２はある程度充電されて充電容量が比較的大きいため、電池電流は目標電流に到達できず徐々に低下する。そして、電池電流が２４０ｍＡ以下まで低下すると、充電目標電圧を４．４Ｖとした定電圧充電が行われ、その後に電池電流が５０ｍＡ以下になると充電が終了する。４．４Ｖの充電目標電圧で定電圧充電が終了したとき、二次電池２の充電容量は８３０ｍＡｈ程度となる。   As described above, when the constant voltage charging is finished with the charging target voltage set to 4.2 V, the charging is resumed on the condition that the load current becomes less than the threshold value during the subsequent standby period. When charging is resumed, first, constant current charging is performed with a target current of 650 mA. At this time, since the secondary battery 2 is charged to some extent and has a relatively large charge capacity, the battery current cannot reach the target current and gradually decreases. And if battery current falls to 240 mA or less, the constant voltage charge which made the charge target voltage 4.4V will be performed, and charge will be complete | finished when battery current will be 50 mA or less after that. When constant voltage charging is completed at a charging target voltage of 4.4 V, the charging capacity of the secondary battery 2 is about 830 mAh.

図５は、定電圧充電中に充電目標電圧が切り替えられる場合の電池電圧及び電池電流の変化を概略的に示したタイミングチャートである。この図５に示すように、充電が開始されると、まず、目標電流が８０ｍＡの予備充電が行われた後、目標電流を６５０ｍＡとして定電流充電が行われる。その後、二次電池２への充電容量が大きくなってくると、電池電流が目標電流に到達できず徐々に低下し、電池電流が２４０ｍＡ以下まで低下すると、充電目標電圧を４．２Ｖとした定電圧充電に切り替わる。   FIG. 5 is a timing chart schematically showing changes in battery voltage and battery current when the charging target voltage is switched during constant voltage charging. As shown in FIG. 5, when charging is started, first, preliminary charging with a target current of 80 mA is performed, and then constant current charging is performed with a target current of 650 mA. Thereafter, when the charging capacity to the secondary battery 2 increases, the battery current cannot reach the target current and gradually decreases. When the battery current decreases to 240 mA or less, the charging target voltage is set to 4.2V. Switch to voltage charging.

充電中に携帯電話機１のユーザ操作が中止された場合のように、負荷回路３の駆動が途中で停止したような状態では、充電目標電圧を４．２Ｖとした定電圧充電中に負荷電流が２００ｍＡ未満にまで低下する場合がある。このような場合には、図５に示すように、定電圧充電中に充電目標電圧が４．２Ｖから４．４Ｖに切り替えられ、その後に電池電流が５０ｍＡ以下になると充電が終了する。   In a state where the driving of the load circuit 3 is stopped halfway, such as when the user operation of the mobile phone 1 is stopped during charging, the load current is constant during charging at a constant voltage with the charging target voltage set to 4.2V. It may be reduced to less than 200 mA. In such a case, as shown in FIG. 5, the charging target voltage is switched from 4.2 V to 4.4 V during constant voltage charging, and then the charging ends when the battery current becomes 50 mA or less.

本実施の形態では、二次電池２の充電中は、負荷電流に基づいて二次電池２の温度を検出して、その二次電池２の温度に基づいて充電目標電圧を印加し、電池電流に基づいて電圧印加を終了することができる。このように、二次電池２の温度を考慮して電圧を印加することにより、二次電池２が高温になって膨張するのを防止しつつ、できるだけ高い電圧を印加することができる。また、電池電流に基づいて電圧印加を終了するので、過充電となるのを確実に防止できる。したがって、十分な充電容量まで安全に充電を行うことができる。   In the present embodiment, during charging of the secondary battery 2, the temperature of the secondary battery 2 is detected based on the load current, and the charging target voltage is applied based on the temperature of the secondary battery 2. The voltage application can be terminated based on the above. In this way, by applying the voltage in consideration of the temperature of the secondary battery 2, it is possible to apply as high a voltage as possible while preventing the secondary battery 2 from becoming hot and expanding. Moreover, since the voltage application is terminated based on the battery current, it is possible to reliably prevent overcharging. Therefore, it is possible to safely charge up to a sufficient charge capacity.

特に、負荷回路３へ流入する負荷電流に基づいて二次電池２の温度を検出することにより、簡易な方法で二次電池２の温度を検出することができるので、構成を簡略化でき、製造コストを低減できる。   In particular, since the temperature of the secondary battery 2 can be detected by a simple method by detecting the temperature of the secondary battery 2 based on the load current flowing into the load circuit 3, the configuration can be simplified and the manufacturing can be performed. Cost can be reduced.

また、負荷電流が２００ｍＡ以上で、二次電池２が高温になりやすい状態のときには、充電目標電圧を比較的低い４．２Ｖに設定し、負荷電流が２００ｍＡ未満で、二次電池２が高温になりにくい状態のときには、充電目標電圧を比較的高い４．４Ｖに設定することができる。したがって、負荷電流が２００ｍＡ以上のときには、二次電池２が加熱されるのを抑制して安全に充電を行い、負荷電流が２００ｍＡ未満のときには、できるだけ高い電圧を印加して十分な充電容量まで充電を行うことができる。   In addition, when the load current is 200 mA or more and the secondary battery 2 is likely to become high temperature, the charging target voltage is set to a relatively low 4.2 V, the load current is less than 200 mA, and the secondary battery 2 becomes high temperature. When it is difficult to occur, the charging target voltage can be set to a relatively high 4.4V. Therefore, when the load current is 200 mA or more, the secondary battery 2 is suppressed from being heated and charged safely, and when the load current is less than 200 mA, a voltage as high as possible is applied to charge to a sufficient charge capacity. It can be performed.

このとき、一定時間内に複数回の負荷電流の検出結果がすべて２００ｍＡ未満となったときにのみ、充電目標電圧を４．２Ｖから４．４Ｖへ切り替え、一定時間内に複数回の負荷電流の検出結果が１回でも２００ｍＡ以上となったときには、充電目標電圧を４．４Ｖから４．２Ｖへ切り替えることができる。これにより、負荷電流の減少又は増大が確実な場合にのみ充電目標電圧を切り替えることができるので、安全性がさらに向上する。   At this time, the charging target voltage is switched from 4.2 V to 4.4 V only when the detection results of a plurality of load currents within a certain time are all less than 200 mA. When the detection result is 200 mA or more even once, the charging target voltage can be switched from 4.4V to 4.2V. As a result, the charging target voltage can be switched only when the decrease or increase of the load current is certain, and the safety is further improved.

また、充電目標電圧を比較的小さい４．２Ｖとして電圧印加が終了した場合、その後の一定時間内に負荷電流が２００ｍＡ未満となれば、充電目標電圧を比較的高い４．４Ｖとして電圧印加を再開することができる。したがって、充電目標電圧が低く十分な充電容量まで充電されなかった場合であっても、その後に高い電圧値で十分に充電を行うことができる。   In addition, when the charging target voltage is set to a relatively small 4.2 V and the voltage application is finished, if the load current becomes less than 200 mA within a certain time thereafter, the charging target voltage is set to a relatively high 4.4 V and the voltage application is resumed. can do. Therefore, even if the charging target voltage is low and the battery has not been charged to a sufficient charging capacity, it can be sufficiently charged with a high voltage value thereafter.

本実施の形態では、二次電池２の温度を負荷電流に基づいて間接的に検出するような構成について説明したが、このような構成に限らず、二次電池２にサーミスタなどの温度検出部を設けて、二次電池２の温度を温度検出部により直接的に検出するような構成であってもよい。さらに、二次電池２の温度を検出する温度検出手段（温度検出ＩＣ）を設けている場合であっても、この温度検出手段によって検出された温度と、負荷電流の検出結果に基づいて、二次電池の温度を予測し、電池充電目標電圧を切り替えることもできる。   In the present embodiment, the configuration in which the temperature of the secondary battery 2 is indirectly detected based on the load current has been described. However, the configuration is not limited to such a configuration, and the temperature detection unit such as a thermistor is included in the secondary battery 2. May be provided, and the temperature of the secondary battery 2 may be directly detected by the temperature detection unit. Further, even when a temperature detection means (temperature detection IC) for detecting the temperature of the secondary battery 2 is provided, the temperature is detected based on the temperature detected by the temperature detection means and the detection result of the load current. The battery charging target voltage can be switched by predicting the temperature of the secondary battery.

また、本実施の形態では、携帯端末装置の一例として携帯電話機１について説明したが、本発明は、携帯電話機に限らず、携帯型のパーソナルコンピュータやＰＤＡ(Personal Digital Assistance)、携帯型の小型テレビなどの他の携帯端末装置にも適用可能である。   Further, in the present embodiment, the mobile phone 1 has been described as an example of the mobile terminal device, but the present invention is not limited to the mobile phone, and is not limited to a mobile phone, a portable personal computer, a PDA (Personal Digital Assistance), or a portable small television. It is applicable also to other portable terminal devices.

本発明の実施の形態による携帯端末装置の一例を示したブロック図であり、携帯端末装置の一例として携帯電話機が示されている。It is the block diagram which showed an example of the portable terminal device by embodiment of this invention, and the mobile telephone is shown as an example of a portable terminal device. 充電制御部による二次電池に対する充電時の制御の一例を示したフローチャートである。It is the flowchart which showed an example of the control at the time of charge with respect to a secondary battery by a charge control part. 定電圧充電時の制御の一例を示したフローチャートである。It is the flowchart which showed an example of the control at the time of constant voltage charge. 充電が再開される場合の電池電圧及び電池電流の変化を概略的に示したタイミングチャートである。6 is a timing chart schematically showing changes in battery voltage and battery current when charging is resumed. 定電圧充電中に充電目標電圧が切り替えられる場合の電池電圧及び電池電流の変化を概略的に示したタイミングチャートである。6 is a timing chart schematically showing changes in battery voltage and battery current when a charging target voltage is switched during constant voltage charging. 従来の充電システムの構成例を示したブロック図である。It is the block diagram which showed the structural example of the conventional charging system.

符号の説明Explanation of symbols

１ 携帯電話機
２ 二次電池
３ 負荷回路
４ 充電器
５ 充電制御部
６ 目標電圧設定部
７ 電池電流検出部
８ 負荷電流検出部
DESCRIPTION OF SYMBOLS 1 Cellular phone 2 Secondary battery 3 Load circuit 4 Charger 5 Charge control part 6 Target voltage setting part 7 Battery current detection part 8 Load current detection part

Claims (6)

二次電池から電源供給され、上記二次電池の充電中に駆動可能な負荷回路と、
充電中の上記二次電池へ流入する電池電流を検出する電池電流検出手段と、
上記二次電池に対して充電目標電圧を印加し、上記電池電流に基づいて電圧印加を終了する充電制御手段と、
充電中における上記二次電池の温度を検出する電池温度検出手段と、
上記電池温度検出手段による検出結果に基づいて、上記充電目標電圧を設定する目標電圧設定手段とを備えたことを特徴とする携帯端末装置。 A load circuit that is powered by a secondary battery and can be driven during charging of the secondary battery;
Battery current detection means for detecting the battery current flowing into the secondary battery being charged;
Charging control means for applying a charging target voltage to the secondary battery and terminating the voltage application based on the battery current;
Battery temperature detection means for detecting the temperature of the secondary battery during charging;
A portable terminal device comprising: target voltage setting means for setting the charge target voltage based on a detection result by the battery temperature detection means. 上記電池温度検出手段は、上記負荷回路へ流入する負荷電流を検出する負荷電流検出手段からなることを特徴とする請求項１に記載の携帯端末装置。   2. The portable terminal device according to claim 1, wherein the battery temperature detecting means includes load current detecting means for detecting a load current flowing into the load circuit. 上記目標電圧設定手段は、負荷電流を所定の閾値と比較し、負荷電流が上記閾値以上の場合に充電目標電圧を第１電圧値に設定し、負荷電流が上記閾値未満の場合に充電目標電圧を上記第１電圧値よりも高い第２電圧値に設定することを特徴とする請求項２に記載の携帯端末装置。   The target voltage setting means compares the load current with a predetermined threshold, sets the charge target voltage to the first voltage value when the load current is equal to or greater than the threshold, and sets the charge target voltage when the load current is less than the threshold. The mobile terminal device according to claim 2, wherein the second voltage value higher than the first voltage value is set. 上記充電制御手段は、上記第１電圧値を充電目標電圧として電圧印加が終了した後、一定時間内に負荷電流が上記閾値未満になった場合に、上記二次電池に対する電圧印加を再開し、
上記目標電圧設定手段は、再開した電圧印加の充電目標電圧を上記第２電圧値に設定することを特徴とする請求項３に記載の携帯端末装置。 The charging control means restarts the voltage application to the secondary battery when the load current becomes less than the threshold value within a certain time after the voltage application is finished with the first voltage value as the charging target voltage.
4. The portable terminal device according to claim 3, wherein the target voltage setting means sets the resumed voltage application charging target voltage to the second voltage value. 上記負荷電流検出手段は、一定時間内に負荷電流を複数回検出するものであり、
上記目標電圧設定手段は、上記第１電圧値を充電目標電圧として電圧を印加しているときに、上記複数回の負荷電流の検出結果がすべて上記閾値未満になった場合に、充電目標電圧を上記第２電圧値に切り替え、上記第２電圧値を充電目標電圧として電圧を印加しているときに、上記複数回の負荷電流の検出結果が１回でも上記閾値以上になった場合に、充電目標電圧を上記第１電圧値に切り替えることを特徴とする請求項４に記載の携帯端末装置。 The load current detecting means detects the load current a plurality of times within a predetermined time,
The target voltage setting means sets the charge target voltage when the detection result of the plurality of load currents is less than the threshold value when applying the voltage with the first voltage value as the charge target voltage. When switching to the second voltage value and applying the voltage with the second voltage value as the charging target voltage, charging is performed when the detection result of the plurality of load currents exceeds the threshold even once. The portable terminal device according to claim 4, wherein the target voltage is switched to the first voltage value. 上記負荷電流検出手段は、一定時間内に負荷電流を複数回検出するものであり、
上記目標電圧設定手段は、上記第１電圧値を充電目標電圧として印加しているときに、上記複数回の負荷電流の平均値が上記閾値未満になった場合に、充電目標電圧を上記第２電圧値に切り替え、上記第２電圧値を充電目標電圧として印加しているときに、上記複数回の負荷電流の平均値が上記閾値以上になった場合に、充電目標電圧を上記第１電圧値に切り替えることを特徴とする請求項４に記載の携帯端末装置。
The load current detecting means detects the load current a plurality of times within a predetermined time,
The target voltage setting means sets the charge target voltage to the second voltage when the average value of the plurality of load currents is less than the threshold value when the first voltage value is applied as the charge target voltage. When switching to a voltage value and applying the second voltage value as a charging target voltage, if the average value of the plurality of load currents exceeds the threshold value, the charging target voltage is changed to the first voltage value. The mobile terminal device according to claim 4, wherein the mobile terminal device is switched to
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US11916425B2 (en) 2019-02-14 2024-02-27 Samsung Electronics Co., Ltd. Method for charging battery and electronic device applying the method
CN112406561A (en) * 2019-08-22 2021-02-26 丰田自动车株式会社 Power system and vehicle
JP2021035135A (en) * 2019-08-22 2021-03-01 トヨタ自動車株式会社 Electric power system, and vehicle

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