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JP2005245078A - Electromagnetic induction charging circuit - Google Patents

Electromagnetic induction charging circuit Download PDF

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JP2005245078A
JP2005245078A JP2004048978A JP2004048978A JP2005245078A JP 2005245078 A JP2005245078 A JP 2005245078A JP 2004048978 A JP2004048978 A JP 2004048978A JP 2004048978 A JP2004048978 A JP 2004048978A JP 2005245078 A JP2005245078 A JP 2005245078A
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charging
temperature
secondary battery
electromagnetic induction
charging circuit
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Yuichi Hasumi
雄一 蓮見
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Citizen Watch Co Ltd
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Citizen Watch Co 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

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Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: when a secondary battery is charged immediately below the upper limit of an allowable temperature range provided for the secondary battery as conventional, it takes much time to complete charging or charging cannot be completed due to heat produced during charging and temperature rise due to the ambient environment. <P>SOLUTION: In an electromagnetic induction charging circuit, the value of charging current for a secondary battery 106 is determined on the basis of on the following information: information on the ambient temperature detected by a temperature detecting portion 102 and temperature information obtained from a charging current and temperature rise, stored in a storage portion 107. Thus, charging can be completed in a short time by controlling charging current to the secondary battery 106 while monitoring the ambient temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は電子機器に搭載される二次電池を充電するための電磁誘導充電回路に関するものである。   The present invention relates to an electromagnetic induction charging circuit for charging a secondary battery mounted on an electronic device.

近年のリチウムイオン（Ｌｉ−ｉｏｎ）等の二次電池は、小型・大容量化が進んだことによって、より小型の電子機器への搭載が可能になってきた。すなわち、二次電池の小型・大容量化は、電子機器自体の小型化に貢献している。ところが、電子機器の高機能化・複雑化によって、そのシステムが消費する消費電流は増加傾向にあり、二次電池の充電サイクルは多くなってきた。このため、二次電池を短時間で充電完了することが望まれている。   In recent years, secondary batteries such as lithium ion (Li-ion) have become possible to be mounted on smaller electronic devices due to the progress of miniaturization and large capacity. That is, the reduction in size and capacity of the secondary battery contributes to the reduction in size of the electronic device itself. However, as electronic devices become more sophisticated and complex, the current consumed by the system tends to increase, and the charging cycle of secondary batteries has increased. For this reason, it is desired to complete the charging of the secondary battery in a short time.

従来から使用されている二次電池用充電器は、電子機器と二次電池用充電器本体とを接続するための、電子機器の外部に露出した複数の充電端子を備えている。しかし、長期間使用するうちに充電端子の表面は、酸化による錆や塵芥の付着のために、摩耗や変形をしてしまう。また、接触端子バネの付勢力の低下などによる接触抵抗値の増大により接続不具合が発生し、確実な接続ができなくなる。
以前より防水・防滴仕様の腕時計は知られているが、携帯電話やＰＤＡ（Ｐｅｒｓｏｎａｌ Ｄａｔａ Ａｓｓｉｓｔａｎｃｅ）などに代表される小型携帯端末なども近年防水・防滴仕様が増え、充電端子の劣化の問題が起きている。
一方で、電子機器の軽量化が進み、充電端子一本に加わる荷重がますます減ってきており、充電端子の接続が不安定になりつつある。そのため、充電端子を必要としない電磁誘導方式等を利用した非接触による充電方式が提案されている。 2. Description of the Related Art Conventionally, a secondary battery charger includes a plurality of charging terminals exposed to the outside of an electronic device for connecting the electronic device and a secondary battery charger body. However, the surface of the charging terminal becomes worn or deformed due to rust and dust adhering due to oxidation during long-term use. Further, a connection failure occurs due to an increase in the contact resistance value due to a decrease in the urging force of the contact terminal spring, and a reliable connection cannot be made.
Waterproof / drip-proof wristwatches have been known for some time, but small portable devices such as mobile phones and PDAs (Personal Data Assistance) have recently become more waterproof / drip-proof and the problem of deterioration of charging terminals Is happening.
On the other hand, the weight of electronic devices has progressed, and the load applied to one charging terminal has been decreasing, and the connection of the charging terminal is becoming unstable. Therefore, a non-contact charging method using an electromagnetic induction method that does not require a charging terminal has been proposed.

まず、二次電池を充電する回路を説明する。図６に、知られている二次電池充電回路の概略を図示する。この図を用いて二次電池への充電の様子を説明する。
１０１は二次電池充電回路、１０２は温度検出部、１０３は充電電流制御部、１０４は充電源部、１０６は二次電池、６０１は外部電源である。 First, a circuit for charging a secondary battery will be described. FIG. 6 schematically shows a known secondary battery charging circuit. The state of charging the secondary battery will be described with reference to FIG.
Reference numeral 101 denotes a secondary battery charging circuit, 102 denotes a temperature detection unit, 103 denotes a charging current control unit, 104 denotes a charging source unit, 106 denotes a secondary battery, and 601 denotes an external power source.

外部電源６０１より供給される電源により、二次電池充電回路１０１は動作する。二次電池充電回路１０１は、充電源部１０４と温度検出部１０２と充電電流制御部１０３とからなり、充電源部１０４から温度検出部１０２へは制御信号を出力し、反対に温度検出部１０２から充電源部１０４へは、温度検出部１０２に設置された温度センサの出力信号を出力する。
充電電流制御部１０３で二次電池１０６に充電する際の最大充電電流を設定することが可能であり、その設定に合わせて充電源部１０４より二次電池１０６に電源を供給（充電）を行う。
この時の充電許可条件として、温度検出部１０２で検出される二次電池１０６を含めた周囲の温度が許容範囲内にあることが必要である。また、このとき二次電池１０６を含めた周囲の温度が許容範囲外であれば、充電源部１０４から二次電池１０６への電源供給（充電）は停止する。 The secondary battery charging circuit 101 is operated by the power supplied from the external power source 601. The secondary battery charging circuit 101 includes a charging source unit 104, a temperature detection unit 102, and a charging current control unit 103, and outputs a control signal from the charging source unit 104 to the temperature detection unit 102, and conversely the temperature detection unit 102. Output from the temperature sensor installed in the temperature detection unit 102 to the charging source unit 104.
The charging current control unit 103 can set the maximum charging current when charging the secondary battery 106, and supply (charge) power to the secondary battery 106 from the charging source unit 104 according to the setting. .
As a charge permission condition at this time, it is necessary that the ambient temperature including the secondary battery 106 detected by the temperature detection unit 102 is within an allowable range. At this time, if the ambient temperature including the secondary battery 106 is outside the allowable range, power supply (charging) from the charging source unit 104 to the secondary battery 106 is stopped.

ここで充電時の許容温度範囲を設ける理由は、二次電池１０６の内部や周辺回路の不測の事態（例えば、回路短絡等の不具合の発生）に起因する異常発熱による事故の被害を小さくすることと、極度の高温及び低温状態での充電に起因する二次電池１０６の性能劣化を防止するためである。   The reason why the allowable temperature range is set here is to reduce the damage caused by abnormal heat generation caused by unexpected situations inside the secondary battery 106 or peripheral circuits (for example, occurrence of a malfunction such as a short circuit). This is to prevent performance deterioration of the secondary battery 106 due to charging at extremely high and low temperatures.

次に、電磁誘導方式等を利用した非接触による充電方式を説明する。図７に、知られている電磁誘導式非接触充電器を図示する。この図を用いて説明する。
１０５は二次充電回路、２０７は一次充電器、７０３は外部電源、７０４は発振回路、７０５は一次コイル、７０６は二次コイル、７０７は同調コンデンサ、７０８は平滑用コンデンサ、７０９は半波整流用ダイオード、７１０は電圧レギュレータ、７１１は定電圧電源である。 Next, a non-contact charging method using an electromagnetic induction method or the like will be described. FIG. 7 illustrates a known electromagnetic induction contactless charger. This will be described with reference to this figure.
105 is a secondary charging circuit, 207 is a primary charger, 703 is an external power supply, 704 is an oscillation circuit, 705 is a primary coil, 706 is a secondary coil, 707 is a tuning capacitor, 708 is a smoothing capacitor, and 709 is a half-wave rectifier Diode 710, voltage regulator 711, constant voltage power supply.

一次充電器２０７は、発振回路７０４と一次コイル７０５とから構成され、発振回路７０４には外部電源７０３が供給される。二次充電回路１０５は、二次コイル７０６と同調コンデンサ７０７と平滑用コンデンサ７０８と半波整流用ダイオード７０９と電圧レギュレータ７１０とから構成され、電子機器を動作させる為の定電圧電源７１１を出力する。
一次コイル７０５と二次コイル７０６とが近接することでトランスを形成し、一次充電器２０７から二次充電回路１０５へ電力が伝達される。より効率良く電力を伝達する為に、一次コイル７０５と二次コイル７０６とは磁束が通過する方向に近接することが一般的である。また各コイルの定数（巻数）および同調コンデンサ７０７の定数、発振回路７０４の発振周波数は効率良く電力が伝達されるように選定され調整される。 The primary charger 207 includes an oscillation circuit 704 and a primary coil 705, and an external power supply 703 is supplied to the oscillation circuit 704. The secondary charging circuit 105 includes a secondary coil 706, a tuning capacitor 707, a smoothing capacitor 708, a half-wave rectifying diode 709, and a voltage regulator 710, and outputs a constant voltage power source 711 for operating an electronic device. .
The primary coil 705 and the secondary coil 706 are close to each other to form a transformer, and electric power is transmitted from the primary charger 207 to the secondary charging circuit 105. In order to transmit power more efficiently, the primary coil 705 and the secondary coil 706 are generally close to each other in the direction in which the magnetic flux passes. Further, the constant (number of turns) of each coil, the constant of the tuning capacitor 707, and the oscillation frequency of the oscillation circuit 704 are selected and adjusted so that power can be transmitted efficiently.

図７に示した電磁誘導式非接触充電器では、一次充電器２０７の出力が全て二次充電回路１０５に伝達されることは技術的に非常に困難であり、一般的に充電効率は５０％程度と言われている。このとき伝達されなかった一次充電器２０７の出力の一部は熱に変化し、一次コイル７０５および二次コイル７０６、構成によっては二次充電回路１０５全体も含めて周囲の温度を上昇させる。この周囲の温度に二次電池も含まれる場合、先に説明したように、温度による二次電池の性能劣化防止のために充電を停止などの対策を行わなければならない。   In the electromagnetic induction type non-contact charger shown in FIG. 7, it is technically very difficult to transmit all the outputs of the primary charger 207 to the secondary charging circuit 105, and generally the charging efficiency is 50%. It is said to be about. A part of the output of the primary charger 207 that is not transmitted at this time changes to heat, and the ambient temperature is increased including the primary coil 705 and the secondary coil 706 and the entire secondary charging circuit 105 depending on the configuration. When a secondary battery is also included in the ambient temperature, as described above, it is necessary to take measures such as stopping charging in order to prevent the secondary battery performance from being deteriorated due to the temperature.

以上の説明で明らかなように、従来の知られている電磁誘導式非接触充電器では、充電回路などの周辺の温度ならびに二次電池の温度が上昇すると充電を停止してしまうために、その二次電池が充電完了するまでに必要とする時間が非常に多くかかってしまうという問題があった。   As is clear from the above description, in the known electromagnetic induction type non-contact charger, charging stops when the ambient temperature of the charging circuit or the like and the temperature of the secondary battery rise, There is a problem that it takes a very long time to complete the charging of the secondary battery.

このような問題を解決するために、多くの提案がなされている（例えば、特許文献１参照）。
特許文献１に示した従来技術は、充電時における二次電池の温度を検出し、発熱が発生したと判断した場合は、充電回路を制御し発熱を抑えるというものである。
図を用いて詳しく説明する。図８は特許文献1に示した従来技術である。図８は、特許文献１に示した従来技術をその発明の主旨を逸脱しない範囲において書き直した図である。 In order to solve such a problem, many proposals have been made (see, for example, Patent Document 1).
The prior art disclosed in Patent Document 1 detects the temperature of the secondary battery during charging, and controls the charging circuit to suppress heat generation when it is determined that heat generation has occurred.
This will be described in detail with reference to the drawings. FIG. 8 shows the prior art disclosed in Patent Document 1. FIG. 8 is a diagram in which the prior art shown in Patent Document 1 is rewritten without departing from the gist of the invention.

図８は、二次電池および二次電池充電回路の概略を示しており、その二次電池の充電動作の制御は、携帯型コンピュータシステムの電源管理用マイクロプロセッサ８０３を充電動作制御部として行われる。
１１１は二次電池充電回路、１６６は二次電池、８０１は電源端子、８０３はマイクロプロセッサ、８０４はスイッチング部、８０５は充電電流検出部、８０６は高速充電制御部、８０７は定電圧制御部、８０９は温度検出手段である。 FIG. 8 schematically shows a secondary battery and a secondary battery charging circuit, and the charging operation of the secondary battery is controlled by using the power management microprocessor 803 of the portable computer system as a charging operation control unit. .
111 is a secondary battery charging circuit, 166 is a secondary battery, 801 is a power supply terminal, 803 is a microprocessor, 804 is a switching unit, 805 is a charging current detection unit, 806 is a high-speed charging control unit, 807 is a constant voltage control unit, Reference numeral 809 denotes temperature detection means.

二次電池１６６は、温度を感知する温度検出手段８０９を具備する。二次電池充電回路１１１は、外部電圧源から所定のＤＣ電圧を受ける電源端子８０１と、マイクロプロセッサ８０３による制御信号を送受する端子を具備する。電源端子８０１と二次電池１０６との間にはスイッチング部８０４が設けられ、このスイッチング部８０４を介して二次電池１６６へ供給される充電電流量が充電電流検出部８０５により検出される。高速充電制御
部８０６は、マイクロプロセッサ８０３から提供される充電制御イネーブル信号に応答して二次電池１６６への充電電流切換を行う。
定電圧制御部８０７は、二次電池１６６へ供給される充電電圧を予め定めてあるレベルに維持するためのものである。この定電圧制御部８０７は、充電初期には定電流方式で充電後期には定電圧方式を実行しなければならないリチウムイオンバッテリセルを使用した二次電池１６６を充電する場合に必要な要素である。
二次電池１６６に内蔵された温度検出手段８０９によって検出される温度情報がマイクロプロセッサ８０３へ出力される。 The secondary battery 166 includes temperature detection means 809 that senses the temperature. The secondary battery charging circuit 111 includes a power supply terminal 801 that receives a predetermined DC voltage from an external voltage source, and a terminal that transmits and receives a control signal from the microprocessor 803. A switching unit 804 is provided between the power supply terminal 801 and the secondary battery 106, and the charging current detection unit 805 detects the amount of charging current supplied to the secondary battery 166 via the switching unit 804. The high-speed charging control unit 806 performs charging current switching to the secondary battery 166 in response to a charging control enable signal provided from the microprocessor 803.
The constant voltage control unit 807 is for maintaining the charging voltage supplied to the secondary battery 166 at a predetermined level. This constant voltage control unit 807 is an element necessary for charging a secondary battery 166 using a lithium ion battery cell that must execute a constant current method in the early stage of charging and a constant voltage method in the later stage of charging. .
Temperature information detected by the temperature detection means 809 built in the secondary battery 166 is output to the microprocessor 803.

また、携帯型コンピュータなどに搭載される大型プロセッサには、動作温度が９０〜１００℃にまで達するものがあり、その影響でバッテリ温度も上がりやすくなっている。つまり、周辺の装置の発熱によるバッテリ温度の上昇も無視できない段階にきている。
先に説明したとおり、高温下で大電流による充電を行うと二次電池の寿命を短縮してしまうために、二次電池１６６に内蔵された温度検出手段８０９による温度感知により、温度変化に応じた充電動作制御を行う技術が採用されている。
二次電池１６６の温度が基準値を越えて高温となる場合には、二次電池１６６のフル充電前でも充電を停止するようにしている。しかしこの手法では、高温下での充電容量低下などの現象とも相まって、不十分なまま充電終了、あるいは充電完了までに多大な時間を要してしまうため、二次電池１６６による使用動作時間が短くなるなど不具合を生じている。
これに鑑みて、特許文献１に示した従来技術では、高温下でより高い充電率を達成可能な二次電池充電回路１１１を提供することを目的としている。 Some large-scale processors mounted on portable computers and the like have an operating temperature of 90 to 100 ° C., and the battery temperature easily rises due to the influence. In other words, the rise in battery temperature due to the heat generated by peripheral devices is at a stage where it cannot be ignored.
As described above, charging with a large current at a high temperature shortens the life of the secondary battery. Therefore, the temperature detection by the temperature detection means 809 built in the secondary battery 166 can respond to the temperature change. The technology that performs the charging operation control is adopted.
When the temperature of the secondary battery 166 exceeds the reference value and becomes high, charging is stopped even before the secondary battery 166 is fully charged. However, in this method, coupled with a phenomenon such as a decrease in charge capacity at high temperature, it takes a long time to complete charging or to complete charging while it is insufficient, so that the operation time for use by the secondary battery 166 is short. There are problems such as.
In view of this, the prior art disclosed in Patent Document 1 aims to provide a secondary battery charging circuit 111 capable of achieving a higher charging rate at a high temperature.

そのため、特許文献１に示した従来技術の二次電池充電回路１１１では、二次電池１６６に内蔵された温度検出手段８０９によって検出される二次電池１６６の温度情報と、二次電池１６６周辺の温度を感知する周辺温度検出部（図示しない）によって検出される温度情報とをマイクロプロセッサ８０３において計算し、二次電池１６６への充電電流を制御することで、二次電池１６６自身および周辺の温度を抑圧して高温下での充電を実現し、従来技術に比べて充電率を向上させていた。   Therefore, in the secondary battery charging circuit 111 of the prior art shown in Patent Document 1, the temperature information of the secondary battery 166 detected by the temperature detection means 809 built in the secondary battery 166, and the periphery of the secondary battery 166 The microprocessor 803 calculates temperature information detected by an ambient temperature detection unit (not shown) that senses the temperature, and controls the charging current to the secondary battery 166, whereby the secondary battery 166 itself and the ambient temperature In this way, charging at a high temperature was suppressed and the charging rate was improved compared to the conventional technology.

特開平１０−１２６９７６号公報（第７頁、第２図）Japanese Patent Laid-Open No. 10-126976 (page 7, FIG. 2)

特許文献１に示した従来技術は、発熱を検出しその結果に基づいて充電電流を制御するために、充電時間短縮の効果はあるが、充電による二次電池自体の発熱を主に制御するものであって、充電回路を構成する二次電池以外の部品の発熱を制御するものではない。そのため、充電電流を制御しても二次電池以外の部品の発熱制御はしていないので、充電電流を抑えれば発熱も抑えられるということは可能であるが、定量的な充電電流の制御による定量的な発熱制御は出来ないという問題がある。   The prior art disclosed in Patent Document 1 has an effect of shortening the charging time in order to detect the heat generation and control the charging current based on the result, but mainly controls the heat generation of the secondary battery itself by charging. However, it does not control the heat generation of components other than the secondary battery constituting the charging circuit. Therefore, even if the charging current is controlled, the heat generation control of the parts other than the secondary battery is not performed. Therefore, it is possible to suppress the heat generation if the charging current is suppressed, but it is possible to control the charging current quantitatively. There is a problem that quantitative heat generation control cannot be performed.

詳しく説明する。電磁誘導式非接触充電器を搭載した電子機器の場合、二次電池への充電電流量にもよるが、構成上大電流を流すことが困難であるため、発熱の問題は二次電池の内部抵抗によるものが主なのではなく、電磁誘導式非接触充電器が主に起因している。また、前述の電磁誘導式非接触充電器を搭載した電子機器が腕時計のように極めて小さな形状である場合、発熱源となる一次コイルや二次コイルや二次充電回路等が構造上、二次電池に近接するため、熱の影響を受け易くなる。
問題となる二次電池自体の温度は、周囲の環境温度に発熱量を付加したものなので、室温等の環境温度の影響を大いに受ける。そのため、環境温度が設定した充電許容温度範囲の高温部に近接している状況で充電を行った場合、環境温度と充電に伴って発熱する発熱
量とで充電制御が作動して充電が停止してしまう。高温のために充電を停止した場合、周囲の温度が設定温度以下にならないと再び充電を始めることはない。さらに温度検出部では温度検出がヒステリシス特性を持つために、設定温度にマージン分を付加した温度以下にならないと再充電しないため、二次電池の充電が完了するまで多大な時間を要してしまう。 explain in detail. In the case of an electronic device equipped with an electromagnetic induction type non-contact charger, although it depends on the amount of charge current to the secondary battery, it is difficult to flow a large current due to the configuration, so the problem of heat generation is the problem inside the secondary battery. It is not mainly due to resistance, but mainly due to electromagnetic induction type non-contact chargers. In addition, when the electronic device equipped with the electromagnetic induction type non-contact charger has a very small shape like a wristwatch, the primary coil, secondary coil, secondary charging circuit, etc. that are the heat source are structurally secondary. Since it is close to the battery, it is easily affected by heat.
The temperature of the secondary battery itself in question is greatly influenced by the environmental temperature such as room temperature because it is a value obtained by adding a calorific value to the surrounding environmental temperature. For this reason, when charging is performed in a state where the environmental temperature is close to the high temperature portion of the set allowable charging temperature range, the charging control is activated by the environmental temperature and the amount of heat generated by charging, and the charging is stopped. End up. When the charging is stopped due to the high temperature, the charging is not started again unless the ambient temperature falls below the set temperature. In addition, since the temperature detection has hysteresis characteristics in the temperature detection unit, it will not be recharged unless the temperature falls below the temperature obtained by adding a margin to the set temperature. Therefore, it takes a long time to complete the charging of the secondary battery. .

したがって、特許文献１に示した従来技術の問題を解決し、より短時間に充電を完了させるためには、環境温度が設定した充電許容温度範囲の高温部に近接している場合、充電による発熱による周囲温度が充電許容温度範囲を超えないように制御する必要がある。   Therefore, in order to solve the problem of the prior art shown in Patent Document 1 and complete the charging in a shorter time, when the environmental temperature is close to the high temperature portion of the set allowable charging temperature range, the heat generated by the charging It is necessary to control so that the ambient temperature does not exceed the allowable charging temperature range.

本発明の目的は、上記課題を解決しようとするもので、電子機器を構成する二次電池の充電時間を高温下であっても短時間で完了させるものである。   An object of the present invention is to solve the above-described problems, and is intended to complete a charging time of a secondary battery constituting an electronic device in a short time even at a high temperature.

上記目的を達成するための本発明の電磁誘導充電回路は次のような構成を採用する。   In order to achieve the above object, the electromagnetic induction charging circuit of the present invention employs the following configuration.

二次コイルを有する二次充電回路と、二次電池と、二次電池充電回路と、を有し、一次コイルを有する電磁誘導式非接触充電器によって、二次電池を充電する電磁誘導充電回路において、
二次電池充電回路は、二次電池へ充電電流を供給する充電源部と、二次電池および電磁誘導式非接触充電器を含む周辺の温度を検出する温度検出部と、充電電流と温度上昇とから得られる温度情報を格納する記憶部と、温度検出部で検出する温度と温度情報との情報に従い充電源部を制御する充電電流制御部と、を有することを特徴とする。 An electromagnetic induction charging circuit having a secondary charging circuit having a secondary coil, a secondary battery, and a secondary battery charging circuit, and charging the secondary battery by an electromagnetic induction non-contact charger having a primary coil In
The secondary battery charging circuit includes a charging source section that supplies a charging current to the secondary battery, a temperature detection section that detects the ambient temperature including the secondary battery and the electromagnetic induction type non-contact charger, and a charging current and a temperature rise. And a charging current control unit that controls the charging source unit in accordance with information on the temperature and temperature information detected by the temperature detection unit.

温度情報は、二次電池の充電において生じる電磁誘導式非接触充電器の温度上昇および周囲の環境によって生じる温度変化と充電電流との関係から得られる情報であり、
充電電流制御部は、温度検出部で検出する温度と温度情報とを利用し、段階的に二次電池への充電電流を増減させるように充電源部を制御し、二次電池の温度を充電許容温度範囲内に維持するように制御することを特徴とする。 The temperature information is information obtained from the relationship between the temperature rise caused by the temperature increase of the electromagnetic induction type non-contact charger that occurs in the charging of the secondary battery and the surrounding current and the charging current,
The charging current control unit uses the temperature and temperature information detected by the temperature detection unit to control the charging source unit so as to increase or decrease the charging current to the secondary battery step by step to charge the temperature of the secondary battery. Control is performed to maintain the temperature within an allowable temperature range.

二次電池充電回路は、温度検出部により検出される温度が所定温度よりも高温かあるいは低温が検出された場合に、充電源部の充電電流の供給を止めるように制御することを特徴とする。   The secondary battery charging circuit controls the supply of the charging current to the charging source unit when the temperature detected by the temperature detecting unit is higher or lower than a predetermined temperature. .

二次充電回路と二次電池とが、構造的に近接して配置することにより、温度検出部が二次電池充電回路と二次電池との双方の温度監視を行うことを特徴とする。   Since the secondary charging circuit and the secondary battery are arranged close to each other in structure, the temperature detection unit monitors the temperature of both the secondary battery charging circuit and the secondary battery.

本発明の電磁誘導充電回路を搭載する電子機器では、温度検出部によって、二次電池および電磁誘導式非接触充電器を構成する二次充電回路を含む周辺の温度を検出する。二次電池へ充電電流を出力する充電源部は、温度検出部によって検出される温度が二次電池に設定されている充電許容温度範囲内にある場合に、二次電池への充電を行う。
記憶部には、二次電池の充電において生じる電磁誘導式非接触充電器の温度上昇および周囲の環境によって生じる温度変化と充電電流との関係から得られる温度情報が格納されている。
温度検出部によって検出される温度が二次電池に設定されている充電許容温度範囲を越えそうな場合は、充電電流制御部は、温度検出部によって検出される温度と記憶部に格納されている温度情報とを利用して、二次電池への充電電流値を決定する。充電電流制御部は、決定した充電電流値を増減させるように充電源部を制御して二次電池の充電を行う。本発明の電磁誘導充電回路によれば、電磁誘導式非接触充電器を利用した電子機器の充電
時において、室温等の環境温度と二次電池の充電によって生ずる発熱とによって、設定した充電許容温度範囲を超えることなく短時間に二次電池の充電を完了することを可能にする。 In the electronic device equipped with the electromagnetic induction charging circuit of the present invention, the temperature of the surroundings including the secondary charging circuit constituting the secondary battery and the electromagnetic induction non-contact charger is detected by the temperature detection unit. The charging source unit that outputs the charging current to the secondary battery charges the secondary battery when the temperature detected by the temperature detection unit is within the allowable charging temperature range set for the secondary battery.
The storage unit stores temperature information obtained from the relationship between the charging current and the temperature rise of the electromagnetic induction type non-contact charger that occurs during charging of the secondary battery and the temperature change caused by the surrounding environment.
When the temperature detected by the temperature detection unit is likely to exceed the allowable charging temperature range set for the secondary battery, the charging current control unit is stored in the storage unit and the temperature detected by the temperature detection unit A charging current value for the secondary battery is determined using the temperature information. The charging current control unit controls the charging source unit so as to increase or decrease the determined charging current value and charges the secondary battery. According to the electromagnetic induction charging circuit of the present invention, at the time of charging an electronic device using an electromagnetic induction type non-contact charger, a set allowable charging temperature is set by the environmental temperature such as room temperature and the heat generated by charging the secondary battery. It makes it possible to complete the charging of the secondary battery in a short time without exceeding the range.

以下図面により本発明の電磁誘導充電回路を詳述する。図１は、本発明の電磁誘導充電回路を示すものであり、図２は、本発明の電磁誘導充電回路を構成する電子機器の構造を示すものである。図３は、本発明の電磁誘導充電回路の温度検出部を示す回路図である。   The electromagnetic induction charging circuit of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the electromagnetic induction charging circuit of the present invention, and FIG. 2 shows the structure of an electronic device constituting the electromagnetic induction charging circuit of the present invention. FIG. 3 is a circuit diagram showing a temperature detection unit of the electromagnetic induction charging circuit of the present invention.

[本発明の電磁誘導充電回路の構成説明：図１]
まず本発明の電磁誘導充電回路の構成を図に基づいて説明する。なお、本発明の実施の形態では、電子機器として腕時計等の小型電子機器を想定して説明する。
図１は、本発明の電磁誘導充電回路を説明する概略図である。１０１は二次電池充電回路、１０２は温度検出部、１０３は充電電流制御部、１０４は充電源部、１０５は二次充電回路、１０６は二次電池、１０７は記憶部である。
二次充電回路１０５より供給される電源により、二次電池充電回路１０１は駆動する。二次電池充電回路１０１は、温度検出部１０２と充電電流制御部１０３と充電源部１０４と記憶部１０７とからなり、充電源部１０４から温度検出部１０２へはイネーブル等の制御信号を出力し、反対に温度検出部１０２から充電源部１０４へは温度検出部１０２に設置されたサーミスタ等の温度センサの出力信号を出力する。
充電電流制御部１０３で二次電池１０６に充電する際の最大充電電流を設定することが可能であり、その設定に合わせて充電源部１０４より二次電池１０６に電源の供給（充電）を行う。
充電電流制御部１０３は、充電初期には定電流方式で二次電池１０６を充電し、充電後期には定電圧方式で二次電池１０６を充電する。これは、このような制御を必要とするリチウムイオン電池を使用した二次電池を充電する場合に必要な制御である。
記憶部１０７は、二次電池の充電において生じる電磁誘導式非接触充電器の温度上昇および周囲の環境によって生じる温度変化と充電電流との関係から得られる温度情報が格納されている。
記憶部１０７に格納される温度情報は、設計する電子機器ごとに異なるデータである。すなわち、構成する電磁誘導式非接触充電器や二次電池の仕様によってそれぞれ発熱の状態が異なるからである。そのため、電子機器製品を量産展開するためには、試作段階や量産展開直前の仕様が決定された状態において、予め温度変化と充電電流との関係を測定し、その測定結果を基に記憶部１０７に温度情報を格納する。 [Description of Configuration of Electromagnetic Induction Charging Circuit of the Present Invention: FIG. 1]
First, the configuration of the electromagnetic induction charging circuit of the present invention will be described with reference to the drawings. In the embodiment of the present invention, description will be made assuming a small electronic device such as a wristwatch as the electronic device.
FIG. 1 is a schematic diagram illustrating an electromagnetic induction charging circuit according to the present invention. Reference numeral 101 denotes a secondary battery charging circuit, 102 a temperature detection unit, 103 a charging current control unit, 104 a charging source unit, 105 a secondary charging circuit, 106 a secondary battery, and 107 a storage unit.
The secondary battery charging circuit 101 is driven by the power supplied from the secondary charging circuit 105. The secondary battery charging circuit 101 includes a temperature detection unit 102, a charging current control unit 103, a charging source unit 104, and a storage unit 107, and outputs a control signal such as an enable signal from the charging source unit 104 to the temperature detection unit 102. On the contrary, an output signal from a temperature sensor such as a thermistor installed in the temperature detection unit 102 is output from the temperature detection unit 102 to the charging source unit 104.
The charging current control unit 103 can set the maximum charging current when charging the secondary battery 106, and supply (charge) power to the secondary battery 106 from the charging source unit 104 according to the setting. .
The charging current control unit 103 charges the secondary battery 106 by the constant current method at the beginning of charging, and charges the secondary battery 106 by the constant voltage method at the later stage of charging. This is the control required when charging a secondary battery using a lithium ion battery that requires such control.
The storage unit 107 stores temperature information obtained from the relationship between the temperature rise caused by the temperature increase of the electromagnetic induction type non-contact charger that occurs during the charging of the secondary battery and the charging current.
The temperature information stored in the storage unit 107 is different data for each electronic device to be designed. That is, the state of heat generation differs depending on the specifications of the electromagnetic induction type non-contact charger and the secondary battery that are configured. Therefore, in order to expand the mass production of electronic equipment products, the relationship between the temperature change and the charging current is measured in advance in a state where the specifications at the trial production stage and immediately before the mass production are determined, and the storage unit 107 is based on the measurement result. Store temperature information in

実際の運用に際して、充電許可条件として温度検出部１０２で検出される二次電池１０６を含めた周囲の温度が許容範囲内にあることが必要である。また、このとき二次電池１０６を含めた周囲の温度が許容範囲外であれば、充電源部１０４から二次電池１０６への電源供給（充電）は停止する。   In actual operation, it is necessary that the ambient temperature including the secondary battery 106 detected by the temperature detection unit 102 as a charge permission condition is within an allowable range. At this time, if the ambient temperature including the secondary battery 106 is outside the allowable range, power supply (charging) from the charging source unit 104 to the secondary battery 106 is stopped.

温度検出部１０２から充電電流制御部１０３へ制御信号を出力する。温度検出部１０２では、周囲の温度を段階的に検出して周囲の温度に合致した信号を出力し、充電電流制御部１０３では、その信号に対応し、記憶部１０７に格納されている温度情報を鑑みて二次電池１０６の充電電流値を決定する。充電電流値と電磁誘導式非接触充電器で発生する発熱量とは相関関係にあるため、二次電池１０６の充電電流値を制御することで発熱量を制御することが可能である。   A control signal is output from the temperature detection unit 102 to the charging current control unit 103. The temperature detection unit 102 detects the ambient temperature step by step and outputs a signal that matches the ambient temperature, and the charging current control unit 103 corresponds to the signal and stores temperature information stored in the storage unit 107. In view of the above, the charging current value of the secondary battery 106 is determined. Since the charging current value and the amount of heat generated by the electromagnetic induction type non-contact charger have a correlation, the amount of heat generation can be controlled by controlling the charging current value of the secondary battery 106.

本発明の電磁誘導充電回路を構成する電子機器の特徴的な部分はまさにこの点である。温度検出部１０２からの温度情報に基づき、充電電流制御部１０３は充電源部１０４を制御し、二次電池１０６への充電電流を制御する。すなわち、充電電流と温度上昇との関係
から得られる温度情報を利用して電磁誘導式非接触充電器において発生する発熱量を制御しながら二次電池への充電電流を増減制御するものである。 This is the characteristic part of the electronic equipment that constitutes the electromagnetic induction charging circuit of the present invention. Based on the temperature information from the temperature detection unit 102, the charging current control unit 103 controls the charging source unit 104 to control the charging current to the secondary battery 106. That is, the charging current to the secondary battery is increased or decreased while controlling the amount of heat generated in the electromagnetic induction non-contact charger using temperature information obtained from the relationship between the charging current and the temperature rise.

本発明の実施の形態では、腕時計等の小型電子機器を例にして説明しているので、温度検出部１０２が二次電池１０６および二次充電回路１０５等の周辺の温度検出を兼ねているが、それぞれのデバイスごとに温度検出手段を設けることも、もちろん可能である。その場合、より高精度な温度検出、および監視が可能である。
腕時計のような小型電子機器では、温度検出部１０２が二次電池１０５と周辺の温度検出を兼ねることができるので構成が簡単になり、かつ、複数の温度検出手段を設けた場合にはそれぞれの誤差を補正するための補正回路手段が必要になるが、その手段も省くことができるので更に構成を簡単にすることができる。 In the embodiment of the present invention, a small electronic device such as a wristwatch is described as an example. Therefore, the temperature detection unit 102 also serves to detect the temperature around the secondary battery 106, the secondary charging circuit 105, and the like. Of course, it is possible to provide a temperature detecting means for each device. In that case, more accurate temperature detection and monitoring is possible.
In a small electronic device such as a wristwatch, the temperature detection unit 102 can also serve as a secondary battery 105 and ambient temperature detection, so that the configuration becomes simple and each of the plurality of temperature detection means is provided when a plurality of temperature detection means are provided. A correction circuit means for correcting the error is necessary, but the means can be omitted, and the configuration can be further simplified.

[本発明を搭載した電子機器の構成説明：図２]
図２は本発明の電磁誘導充電回路を構成する電子機器の概略図であり、図２の配線は電源供給経路を示している。１０１は二次電池充電回路、１０５は二次充電回路、１０６は二次電池、２００は電子機器、２０７は一次充電器、２０８はＣＰＵ、２０９はＬＣＤ／ブザー、２１０は外部インターフェースである。 [Description of configuration of electronic device incorporating the present invention: FIG. 2]
FIG. 2 is a schematic view of an electronic device constituting the electromagnetic induction charging circuit of the present invention, and the wiring in FIG. 2 indicates a power supply path. 101 is a secondary battery charging circuit, 105 is a secondary charging circuit, 106 is a secondary battery, 200 is an electronic device, 207 is a primary charger, 208 is a CPU, 209 is an LCD / buzzer, and 210 is an external interface.

一次充電器２０７と二次充電回路１０５とは構造的に近接し、両者が組になって電磁誘導式非接触充電器を構成する。一次充電器２０７の内にある一次コイル（図示せず）と二次充電回路１０５の内にある二次コイル（図示せず）とでトランスを構成し、そのトランスを経由して伝達された電力は二次充電回路１０５の内部で整流され二次電池充電回路１０１に送られる。
二次電池充電回路１０１では、二次電池１０６の残容量や温度等を監視しながら、二次電池１０６に充電する。この場合、二次電池１０６の電源端子と電子機器２００の内部の負荷要素である、ＣＰＵ２０８、ＬＣＤ表示装置やブザー等のＬＣＤ／ブザー２０９、キーボードやスイッチや外部との接続装置等の外部インターフェイス２１０への電源供給も行っている。但し、通常の非充電時は二次電池１０６から各負荷要素への電源を供給する。 The primary charger 207 and the secondary charging circuit 105 are structurally close to each other, and the two together form an electromagnetic induction non-contact charger. A primary coil (not shown) in the primary charger 207 and a secondary coil (not shown) in the secondary charging circuit 105 constitute a transformer, and electric power transmitted via the transformer Is rectified inside the secondary charging circuit 105 and sent to the secondary battery charging circuit 101.
The secondary battery charging circuit 101 charges the secondary battery 106 while monitoring the remaining capacity and temperature of the secondary battery 106. In this case, a power source terminal of the secondary battery 106 and an internal load element of the electronic device 200, such as a CPU 208, an LCD / buzzer 209 such as an LCD display device or a buzzer, an external interface 210 such as a keyboard, a switch, or an external connection device. It also supplies power to. However, during normal non-charging, power is supplied from the secondary battery 106 to each load element.

[本発明の温度検出回路の構成説明：図１、図３、図７]
図３に本発明の温度検出回路を示す。３０１は定電圧電源、３０２から３１０は抵抗、３１１はトランジスタ、３１２はサーミスタ、３１３はコンデンサ、３１４から３１６はコンパレータである。
本発明の電磁誘導充電回路に非接触で電力を供給するシステムは、図７に示した電磁誘導式非接触充電器と変わりがない。図７も参照して説明する。
定電圧電源３０１は図７に示した定電圧電源７１１と兼ねることが可能であるが、安定した電源供給が必要である。図３に示す温度検出回路は、抵抗３０２〜３１０とトランジスタ３１１とサーミスタ３１２とコンデンサ３１３とコンパレータ３１４〜３１６とで構成される。
定電圧電源３０１から抵抗３０３〜３０６が直列接続されて分圧手段が形成され、この抵抗３０３〜３０６の各接続点がコンパレータ３１４，３１５，３１６の反転入力端子にそれぞれ接続している。また、抵抗３０２を介し定電圧電源３０１が接続され、負温度係数をもつサーミスタ３１２には、並列に抵抗３０７，３０８，３０９が接続され、それぞれコンパレータ３１４，３１５，３１６の非反転入力端子に接続している。 [Description of Configuration of Temperature Detection Circuit of the Present Invention: FIG. 1, FIG. 3, FIG. 7]
FIG. 3 shows a temperature detection circuit of the present invention. Reference numeral 301 is a constant voltage power source, 302 to 310 are resistors, 311 is a transistor, 312 is a thermistor, 313 is a capacitor, and 314 to 316 are comparators.
The system for supplying electric power to the electromagnetic induction charging circuit of the present invention in a non-contact manner is the same as the electromagnetic induction-type non-contact charger shown in FIG. This will be described with reference to FIG.
The constant voltage power supply 301 can also serve as the constant voltage power supply 711 shown in FIG. 7, but a stable power supply is required. The temperature detection circuit shown in FIG. 3 includes resistors 302 to 310, a transistor 311, a thermistor 312, a capacitor 313, and comparators 314 to 316.
Resistors 303 to 306 are connected in series from the constant voltage power supply 301 to form voltage dividing means, and the connection points of the resistors 303 to 306 are connected to the inverting input terminals of the comparators 314, 315, and 316, respectively. A constant voltage power supply 301 is connected via a resistor 302, and resistors 307, 308, and 309 are connected in parallel to a thermistor 312 having a negative temperature coefficient, and are connected to non-inverting input terminals of comparators 314, 315, and 316, respectively. doing.

トランジスタ３１１と抵抗３１０とは、図１に示す充電源部１０４の指示によって温度検出部１０２の動作を制御するイネーブル手段である。すなわち、充電源部１０４からハイレベルの制御信号が出力されるとトランジスタ３１１がこれに応じて温度検出部１０２をイネーブルし、反対に充電源部１０４からローレベルの制御信号が出力されるとトラン
ジスタ３１１がこれに応じて温度検出部１０２をディセーブルされる。なお、このスイッチ構成の検出イネーブルおよびディセーブル手段は省くことも可能である。 The transistor 311 and the resistor 310 are enable means for controlling the operation of the temperature detection unit 102 in accordance with an instruction from the charging source unit 104 shown in FIG. That is, when a high-level control signal is output from the charging source unit 104, the transistor 311 enables the temperature detection unit 102 accordingly, and conversely, when a low-level control signal is output from the charging source unit 104, the transistor In response, 311 disables the temperature detection unit 102. The detection enable and disable means of this switch configuration can be omitted.

二次電池１０６に充電する際に、図７に示す電磁誘導式非接触充電器から生じる発熱と室温等の環境温度等とによって周囲温度が上昇してくると、サーミスタ３１２の抵抗値はそれに反比例して減少する。したがって、コンパレータ３１４，３１５，３１６の非反転入力端子の電圧は温度上昇に伴って減少し、各反転入力端子に提供される基準電圧と比較される。つまり、周辺温度は４段階で検出されることになり、最初の段階が常温で、コンパレータ３１４，３１５，３１６はすべてハイレベルを出力する。
温度が上昇して設定された閾値を超えると、サーミスタ３１２による非反転入力端子の電圧が反転入力端子の電圧よりも低くなるので、コンパレータ３１４からローレベルが出力される。さらに温度が上昇して一ランク上に設定された閾値を超え、非反転入力端子の電圧が反転入力端子の電圧よりも低くなるとコンパレータ３１４，３１５からローレベルが出力される。そしてさらに、温度が上昇して最も上位に設定された閾値を超え、非反転入力端子の電圧が反転入力端子の電圧よりも低くなるとコンパレータ３１４，３１５，３１６の全てからからローレベルが出力される。そしてこれらコンパレータ３１４，３１５，３１６からの出力は、図１に示す充電電流制御部１０３に送られ、二次電池１０６への充電電流が制御される。 When the secondary battery 106 is charged, if the ambient temperature rises due to heat generated from the electromagnetic induction type non-contact charger shown in FIG. 7 and environmental temperature such as room temperature, the resistance value of the thermistor 312 is inversely proportional to it. Then decrease. Therefore, the voltages at the non-inverting input terminals of the comparators 314, 315, and 316 decrease as the temperature rises, and are compared with the reference voltage provided to each inverting input terminal. That is, the ambient temperature is detected in four stages, the first stage is at room temperature, and the comparators 314, 315, and 316 all output a high level.
When the temperature rises and exceeds a set threshold value, the voltage at the non-inverting input terminal by the thermistor 312 becomes lower than the voltage at the inverting input terminal, so that the comparator 314 outputs a low level. Further, when the temperature rises and exceeds a threshold value set higher by one rank, and the voltage at the non-inverting input terminal becomes lower than the voltage at the inverting input terminal, the comparators 314 and 315 output a low level. Further, when the temperature rises and exceeds the highest threshold value, and the voltage at the non-inverting input terminal becomes lower than the voltage at the inverting input terminal, a low level is output from all of the comparators 314, 315, and 316. . Outputs from the comparators 314, 315, and 316 are sent to the charging current control unit 103 shown in FIG. 1, and the charging current to the secondary battery 106 is controlled.

[グラフの説明：図４]
図４は本発明の実施の形態において、図１に示す二次電池１０６の充電電流値と二次電池１０６を含む周辺の上昇温度とを計測したグラフである。横軸に充電電流（Ｃは電池の電流特性の目安であり、一時間で理論電池容量を充電あるいは放電するとき１Ｃと言う）、縦軸に周囲の上昇温度（℃）を示している。
図４に示すように、二次電池充電電流値が増加すると周囲温度が上昇する。この上昇の原因は充電時の二次電池内部抵抗による発熱もあるが、主たる原因は電磁誘導式非接触充電器によって充電される際に発生する充電損失である。
このグラフからもわかるように、充電電流と二次電池を含む周囲の温度上昇とをデータベース化した温度情報を利用することによって、本発明の電子機器においては、周囲温度を監視することによって二次電池充電電流値を制御しすることが可能になる。 [Explanation of graph: Fig. 4]
FIG. 4 is a graph obtained by measuring the charging current value of the secondary battery 106 shown in FIG. 1 and the surrounding temperature increase including the secondary battery 106 in the embodiment of the present invention. The abscissa indicates the charging current (C is a measure of the current characteristics of the battery and is referred to as 1 C when the theoretical battery capacity is charged or discharged in one hour), and the ordinate indicates the ambient temperature rise (° C.).
As shown in FIG. 4, the ambient temperature rises as the secondary battery charging current value increases. The cause of this rise is heat generation due to the internal resistance of the secondary battery during charging, but the main cause is charge loss that occurs when charging by an electromagnetic induction type non-contact charger.
As can be seen from this graph, in the electronic device of the present invention, the secondary temperature is monitored by monitoring the ambient temperature by using the temperature information obtained by creating a database of the charging current and the ambient temperature rise including the secondary battery. It becomes possible to control the battery charging current value.

すなわち、あらかじめ充電電流値と二次電池１０６を含む周辺の上昇温度との関係がデータベース化されていれば、充電中に環境等の影響で周辺の温度が上昇した場合に、二次電池１０６への充電電流値を制御することで周辺温度の上昇を抑えることが可能になり、中断することなく充電を完了させることが可能になる。   That is, if the relationship between the charging current value and the surrounding rising temperature including the secondary battery 106 is stored in a database in advance, when the surrounding temperature rises due to the environment or the like during charging, the secondary battery 106 is transferred to. By controlling the charging current value, it is possible to suppress an increase in the ambient temperature, and it is possible to complete the charging without interruption.

周辺の温度が設定した充電許容温度範囲より上方に超えてしまうと、周辺温度が温度範囲内まで低下しないと充電は再開されない。また、温度検出手段にはヒステリシス特性が存在するため、充電許容温度範囲にマージンを追加した温度まで周辺温度が低下しないと充電は再開されない。そのため、二次電池の充電を効率良く短時間に完了させるためには、充電許容温度の上限を超えない範囲で充電することが重要なのである。   If the ambient temperature exceeds the set allowable charging temperature range, charging is not resumed unless the ambient temperature falls within the temperature range. Further, since the temperature detecting means has a hysteresis characteristic, charging is not restarted unless the ambient temperature is lowered to a temperature obtained by adding a margin to the allowable charging temperature range. For this reason, in order to efficiently complete the charging of the secondary battery in a short time, it is important to charge within a range that does not exceed the upper limit of the allowable charging temperature.

[グラフの説明：図５]
図５は本発明の実施の形態において、二次電池充電時の各環境温度下での二次電池電圧と充電時間とを計測したグラフである。横軸に充電時間（ｍｉｎ）、縦軸に二次電池の電池電圧（Ｖ）を示している。５０１と５０２と５０３とは充電特性を表している。
一般的なリチウムイオン電池を使用した二次電池の最大定格を４．２Ｖと想定し、この電圧まで充電する場合の充電時間を調べたものである。
５０１は、環境温度が２５℃の時の充電時間と二次電池の電圧との関係を示す充電特性であり、理想的な二次電池の充電完了時間を示している。５０２と５０３とは、環境温度
が４５℃の時の充電特性を示しており、５０２は本発明の電磁誘導充電回路を搭載した電子機器を示し、５０３は図６に示した知られている二次電池充電回路を搭載した電子機器を示している。本発明の実施の形態では、二次電池の許容充電温度範囲を０〜５０℃としている。
本発明の電磁誘導充電回路を搭載した電子機器でも従来の知られている二次電池充電回路でも、環境温度が低温である２５℃の時には、双方とも同じく５０１の充電特性を示すが、環境温度が高温である４５℃の時はそれぞれ異なる充電制御をしているために５０２と５０３とで充電特性が異なる。 [Explanation of graph: Fig. 5]
FIG. 5 is a graph obtained by measuring the secondary battery voltage and the charging time under each environmental temperature when charging the secondary battery in the embodiment of the present invention. The horizontal axis represents the charging time (min), and the vertical axis represents the battery voltage (V) of the secondary battery. Reference numerals 501, 502, and 503 represent charging characteristics.
The maximum rating of a secondary battery using a general lithium ion battery is assumed to be 4.2 V, and the charging time when charging up to this voltage is examined.
Reference numeral 501 denotes a charging characteristic indicating a relationship between the charging time when the environmental temperature is 25 ° C. and the voltage of the secondary battery, and indicates an ideal charging completion time of the secondary battery. Reference numerals 502 and 503 indicate charging characteristics when the environmental temperature is 45 ° C., 502 indicates an electronic device equipped with the electromagnetic induction charging circuit of the present invention, and 503 indicates the known two shown in FIG. An electronic device equipped with a secondary battery charging circuit is shown. In the embodiment of the present invention, the allowable charging temperature range of the secondary battery is 0 to 50 ° C.
Both the electronic device equipped with the electromagnetic induction charging circuit of the present invention and the conventionally known secondary battery charging circuit both show the same charging characteristics of 501 when the environmental temperature is 25 ° C., which is a low temperature. When the temperature is 45 ° C., which is a high temperature, the charging characteristics are different between 502 and 503 because different charging control is performed.

それぞれの定電流充電時の充電電流値は１Ｃであり、環境温度が低温の場合である５０１は、およそ６０分強で充電が完了することを示している。環境温度が高温の場合である５０２は、充電開始からおよそ２０分までは１Ｃで充電するが、図４からわかるように、１Ｃ充電時には約１２℃の温度上昇が見込まれる。そのため、許容充電温度範囲上限である５０℃に近づいたところで、充電電流を０．５Ｃに低下させたので、５０１よりは時間を要したが１２０分程度で充電を完了した。同様に環境温度が高温の場合である５０３は、２０分を過ぎたところで許容充電温度範囲の上限を超えてしまったため充電が停止し、周囲温度が低下後に再び定電流（１Ｃ）充電を行うがしばらくすると上限を再び超えてしまう。これを繰り返してしまうので充電終了までに多大な時間を要してしまい、充電を必要とする電子機器として必要とされる短時間での充電完了を実現することができなくなってしまう。   The charging current value at the time of each constant current charging is 1C, and 501 when the environmental temperature is low indicates that charging is completed in about 60 minutes or more. 502, which is a case where the environmental temperature is high, is charged at 1 C until approximately 20 minutes from the start of charging, but as can be seen from FIG. 4, a temperature increase of about 12 ° C. is expected during 1 C charging. Therefore, when it approached 50 ° C., which is the upper limit of the allowable charging temperature range, the charging current was reduced to 0.5 C. Therefore, it took more time than 501 but the charging was completed in about 120 minutes. Similarly, in 503, which is a case where the environmental temperature is high, charging is stopped because the upper limit of the allowable charging temperature range is exceeded after 20 minutes, and constant current (1C) charging is performed again after the ambient temperature has decreased. After a while, the upper limit is exceeded again. Since this process is repeated, a long time is required until the end of charging, and the completion of charging in a short time required as an electronic device that requires charging cannot be realized.

以上の説明で明らかなように、本発明の電磁誘導充電回路は、充電時に電磁誘導式非接触充電器によって生じる発熱と二次電池充電電流との相関関係をデータベース化した温度情報を利用することにより、二次電池充電電流値を制御することによって電磁誘導式非接触充電器による発熱を制御する構成を有する。本発明の電子機器の特徴的な部分はまさにこの点である。従来にはない二次電池の温度制御を充電電流制御によって実現させ、高温環境下での短時間による充電作業の完了を可能にできたのであり、この発明は従来技術にはない格別の効果である。   As is apparent from the above description, the electromagnetic induction charging circuit of the present invention uses temperature information in which the correlation between the heat generated by the electromagnetic induction type non-contact charger during charging and the charging current of the secondary battery is made into a database. Thus, the heat generation by the electromagnetic induction type non-contact charger is controlled by controlling the secondary battery charging current value. This is the characteristic part of the electronic device of the present invention. The temperature control of the secondary battery, which has not been achieved in the past, has been realized by the charging current control, and it has been possible to complete the charging work in a short time in a high temperature environment. This invention has a special effect not found in the prior art. is there.

本発明の電磁誘導充電回路を搭載した電子機器では、通常の電子機器では必要とされる充電用の接続端子が不要であるため、防水構造をより容易に実現することができる。また、従来技術と比較して高温下における短時間の充電完了を実現することも可能である。これらの特徴から防水性が求められる腕時計や、より大きな二次電池を必要とする携帯型ＰＤＡ等の電子機器に好適である。   In the electronic device equipped with the electromagnetic induction charging circuit of the present invention, a connection terminal for charging that is required in a normal electronic device is unnecessary, so that a waterproof structure can be realized more easily. In addition, it is possible to complete charging in a short time at a high temperature as compared with the prior art. Because of these characteristics, it is suitable for electronic devices such as wristwatches that require waterproofness and portable PDAs that require larger secondary batteries.

本発明の電磁誘導充電回路を説明する概略図である。It is the schematic explaining the electromagnetic induction charging circuit of this invention. 本発明の電磁誘導充電回路を用いた電子機器の概略図である。It is the schematic of the electronic device using the electromagnetic induction charging circuit of this invention. 本発明の温度検出回路図である。It is a temperature detection circuit diagram of the present invention. 本発明の電磁誘導充電回路の二次電池充電電流と周囲上昇温度のグラフである。It is a graph of the secondary battery charging current and ambient temperature rise of the electromagnetic induction charging circuit of the present invention. 本発明の各温度環境下での二次電池電圧と充電時間のグラフである。It is a graph of the secondary battery voltage and charge time in each temperature environment of this invention. 従来技術の二次電池充電回路を説明する概略図である。It is the schematic explaining the secondary battery charging circuit of a prior art. 電磁誘導式非接触充電器を示す回路図である。It is a circuit diagram which shows an electromagnetic induction type non-contact charger. 特許文献１に示した従来技術を説明する図である。It is a figure explaining the prior art shown in patent document 1. FIG.

符号の説明Explanation of symbols

１０１ 二次電池充電回路
１０２ 温度検出部
１０３ 充電電流制御部
１０４ 充電源部
１０５ 二次充電回路
１０６ 二次電池 DESCRIPTION OF SYMBOLS 101 Secondary battery charging circuit 102 Temperature detection part 103 Charging current control part 104 Charging source part 105 Secondary charging circuit 106 Secondary battery

Claims (4)

二次コイルを有する二次充電回路と、二次電池と、二次電池充電回路と、を有し、一次コイルを有する電磁誘導式非接触充電器によって、前記二次電池を充電する電磁誘導充電回路において、
前記二次電池充電回路は、前記二次電池へ充電電流を供給する充電源部と、前記二次電池および前記電磁誘導式非接触充電器を含む周辺の温度を検出する温度検出部と、充電電流と温度上昇とから得られる温度情報を格納する記憶部と、前記温度検出部で検出する温度と前記温度情報との情報に従い前記充電源部を制御する充電電流制御部と、を有することを特徴とする電磁誘導充電回路。 Electromagnetic induction charging comprising: a secondary charging circuit having a secondary coil; a secondary battery; and a secondary battery charging circuit, wherein the secondary battery is charged by an electromagnetic induction non-contact charger having a primary coil. In the circuit
The secondary battery charging circuit includes a charging source unit that supplies a charging current to the secondary battery, a temperature detection unit that detects the ambient temperature including the secondary battery and the electromagnetic induction non-contact charger, and charging A storage unit that stores temperature information obtained from current and temperature rise, and a charging current control unit that controls the charging source unit in accordance with the temperature detected by the temperature detection unit and the temperature information. A characteristic electromagnetic induction charging circuit. 前記温度情報は、前記二次電池の充電において生じる前記電磁誘導式非接触充電器の温度上昇および周囲の環境によって生じる温度変化と充電電流との関係から得られる情報であり、
前記充電電流制御部は、前記温度検出部で検出する温度と前記温度情報とを利用し、段階的に前記二次電池への充電電流を増減させるように前記充電源部を制御し、前記二次電池の温度を充電許容温度範囲内に維持するように制御することを特徴とする請求項１に記載の電磁誘導充電回路。 The temperature information is information obtained from the relationship between the temperature rise caused by the temperature increase of the electromagnetic induction type non-contact charger that occurs in charging of the secondary battery and the surrounding environment and the charging current,
The charging current control unit uses the temperature detected by the temperature detection unit and the temperature information to control the charging source unit to increase or decrease the charging current to the secondary battery in a stepwise manner. 2. The electromagnetic induction charging circuit according to claim 1, wherein the temperature of the secondary battery is controlled to be maintained within the allowable charging temperature range. 前記二次電池充電回路は、前記温度検出部により検出される温度が所定温度よりも高温かあるいは低温が検出された場合に、前記充電源部の充電電流の供給を止めるように制御することを特徴とする請求項１から２のいずれか１つに記載の電磁誘導充電回路。   The secondary battery charging circuit controls to stop supplying the charging current of the charging source unit when the temperature detected by the temperature detecting unit is higher or lower than a predetermined temperature. The electromagnetic induction charging circuit according to any one of claims 1 to 2, wherein the electromagnetic induction charging circuit is characterized in that: 前記二次充電回路と前記二次電池とが、構造的に近接して配置することにより、前記温度検出部が前記二次電池充電回路と前記二次電池との双方の温度監視を行うことを特徴とする請求項１から３に記載の電磁誘導充電回路。   By arranging the secondary charging circuit and the secondary battery in close proximity to each other, the temperature detection unit monitors the temperature of both the secondary battery charging circuit and the secondary battery. The electromagnetic induction charging circuit according to claim 1, wherein:
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