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JP2006281405A - Cordless power tool - Google Patents

Cordless power tool Download PDF

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Publication number
JP2006281405A
JP2006281405A JP2005107233A JP2005107233A JP2006281405A JP 2006281405 A JP2006281405 A JP 2006281405A JP 2005107233 A JP2005107233 A JP 2005107233A JP 2005107233 A JP2005107233 A JP 2005107233A JP 2006281405 A JP2006281405 A JP 2006281405A
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battery
voltage
switching element
motor
turned
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JP4857585B2 (en
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Hiroyuki Hanawa
浩之 塙
Masayuki Ogura
政幸 小倉
Kazuhiko Funabashi
一彦 船橋
Takahisa Aradate
卓央 荒舘
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Koki Holdings Co Ltd
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Hitachi Koki 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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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Portable Power Tools In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cordless power tool taking a lithium cell as a power source, putting the FET in the off state when the voltage of the lithium cell reaches a first predetermined value or less, and safely again rotating a motor when the cell voltage reaches a second predetermined value during the off state by inserting the TFT as a switching element in a current passage including the cell and the motor. <P>SOLUTION: This cordless power tool includes: a DC motor for supplying a driving current from a battery cell through the switching element; a trigger switch for controlling the start and stop of the DC motor; a voltage detecting means for detecting the cell voltage of the battery cell; and a control means for on-off controlling the switching element on receiving a detection signal from the voltage detecting means, wherein the control means turns off the switching element when the battery voltage reaches a first predetermined voltage or less, and then turns on the switching element when the battery voltage reaches a second predetermined voltage after the trigger switch is turned off. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はリチウム電池を用いたコードレス電動工具に係り、特にリチウム電池の過放電を防止するための回路手段を備えた電動工具に関する。   The present invention relates to a cordless power tool using a lithium battery, and more particularly to a power tool provided with circuit means for preventing overdischarge of a lithium battery.

電動ドライバ、電動ドリル、インパクト工具などの電動工具は一般に、回転動力を発生するモータの回転速度を減速機構により減速した後、回転動力を先端工具に伝達するように構成されている。モータの電源としては従来、交流の商用電源が用いられてきたが、近年、ニッケル・カドミウム電池（以下ニカド電池）や、ニッケル水素電池などに代表されるアルカリ二次電池を電源として用いたコードレス電動工具が多用されるようになった。   Electric tools such as an electric driver, electric drill, and impact tool are generally configured to transmit rotational power to a tip tool after the rotational speed of a motor that generates rotational power is reduced by a reduction mechanism. Conventionally, AC commercial power has been used as a power source for motors. However, in recent years, cordless electric motors that use alkaline secondary batteries such as nickel-cadmium batteries (hereinafter referred to as nickel-cadmium batteries) and nickel-hydrogen batteries as power sources have been used. A lot of tools are used.

このコードレス電動工具においては、工具の所要電圧が大きくなるに従って、当然、電池パック内に収容する電池セル数も多くなる。例えば、ニカド電池セルの公称電圧は１．２Ｖであるため、電池電圧が１４．４Ｖの電動工具では１２個、２４Ｖの場合は２０個の電池セルを電池パックに収納して電動工具に装着する必要がある。従って所要電圧が大きくなるに従って、工具全体の重量が重くなるという問題があった。   In this cordless power tool, as the required voltage of the tool increases, the number of battery cells accommodated in the battery pack naturally increases. For example, since the nominal voltage of the nickel-cadmium battery cell is 1.2V, 12 battery tools with a battery voltage of 14.4V or 20 battery cells with a battery voltage of 24V are stored in a battery pack and attached to the power tool. There is a need. Accordingly, there is a problem that the weight of the entire tool increases as the required voltage increases.

これに対し、リチウム電池、リチウムイオン電池に代表される有機電解液二次電池は、公称電圧が大きいために、必要とするセル数を少なくすることができ、この結果、電動工具を軽量小型にできるという利点がある。   On the other hand, organic electrolyte secondary batteries represented by lithium batteries and lithium ion batteries have a large nominal voltage, so the number of required cells can be reduced. As a result, the power tool can be made lighter and smaller. There is an advantage that you can.

ここでリチウム電池とは、バナジウム・リチウム電池、マンガンリチウム電池等を指し、いずれも負極にリチウム・アルミ合金を用い、有機電解液を使用した電池を言う。また、リチウムイオン電池は一般に、正極にコバルト酸リチウム、負極に黒鉛を使用し、電解液として有機電解液を用いたものである。本願明細書では、便宜上、リチウム電池及びリチウムイオン電池を含む有機電解液二次電池を総称して、単にリチウム電池と称することにする。   Here, the lithium battery refers to a vanadium / lithium battery, a manganese lithium battery, or the like, both of which use a lithium / aluminum alloy for the negative electrode and use an organic electrolyte. In general, a lithium ion battery uses lithium cobaltate as a positive electrode, graphite as a negative electrode, and an organic electrolyte as an electrolyte. In this specification, for convenience, organic electrolyte secondary batteries including a lithium battery and a lithium ion battery will be collectively referred to as a lithium battery.

リチウム電池の公称電圧は、例えば３．６Ｖと高く、二カド電池の３本分に相当する電圧が得られるから、電動工具の電源として用いた場合はセル本数を大幅に低減することができるという利点があるが、その反面、リチウム電池は、過充電、過放電を行うと著しく性能が劣化し、サイクル寿命が短くなってしまうという問題がある。また、リチウム電池を過充電すると、電解液の分解に伴ってガスが発生するという問題もあり、更には過放電を行うと特性が著しく劣化し、その後の充電で電池内部に短絡が生じることもある。   The nominal voltage of the lithium battery is as high as 3.6 V, for example, and a voltage equivalent to three of the two-cadmium batteries can be obtained, so that the number of cells can be greatly reduced when used as a power source for a power tool. On the other hand, there is a problem that the lithium battery is remarkably deteriorated in performance when it is overcharged or overdischarged, and the cycle life is shortened. In addition, when a lithium battery is overcharged, there is a problem that gas is generated along with the decomposition of the electrolyte. Further, when overdischarge is performed, the characteristics are remarkably deteriorated, and a short circuit may occur inside the battery by subsequent charging. is there.

このため本出願人は先に、特願２００１−３５６５７６号（特開２００３−１６４０６６号）において、電池パックとモータとの間に電界効果トランジスタ（以下ＦＥＴという）よりなるスイッチング素子を挿入し、過放電に至る前にスイッチング素子を遮断して電池セルを保護する回路及びその制御方式について出願した。   For this reason, the present applicant previously inserted a switching element made of a field effect transistor (hereinafter referred to as FET) between the battery pack and the motor in Japanese Patent Application No. 2001-356576 (Japanese Patent Laid-Open No. 2003-164066). We applied for a circuit that protects the battery cell by shutting off the switching element before discharging, and its control method.

特開２００３−１６４０６６号公報JP 2003-164066 A 特開平１１−５５８６６号公報Japanese Patent Laid-Open No. 11-55866 特開２００２−２２３５２５号公報JP 2002-223525 A 特開２０００−１２１０７号公報JP 2000-12107 A 特開平４−７５４３０号公報JP-A-4-75430

図５は、電池電圧とスイッチング素子であるＦＥＴのオン・オフ動作の関係を示す。同図（ｂ）のように、リチウム電池の電圧は電動工具の使用と共に徐々に低下し、Ｔ１の時点で第１所定電圧Ｖ１に達すると、ＦＥＴはオフ状態となり、電池の放電を停止する。 FIG. 5 shows the relationship between the battery voltage and the on / off operation of the FET as a switching element. As shown in FIG. (B), the voltage of the lithium battery is gradually reduced with the use of the power tool reaches the first predetermined voltages V 1 at time T 1, FET is turned off, stopping the discharge of the battery To do.

リチウム電池は、放電を停止したまましばらく放置すると、充電をしなくとも再び徐々に電圧が上昇する性質がある。電池電圧が、同図（ｂ）のＴ２の時点で第２所定電圧Ｖ２以上になると、ＦＥＴは再びオン状態になる。 Lithium batteries have the property that if they are left for a while with discharge stopped, the voltage gradually rises again without being charged. Battery voltage, becomes the second predetermined voltage V 2 or at time T 2 of the same figure (b), FET is turned on again.

図５（ａ）は、電動工具のトリガスイッチのオン・オフ状態を示すものであるが、時点Ｔ２でＦＥＴがオン状態になった時に、トリガスイッチがオン状態の場合には電動工具の直流モータが突然回転を始めることになる。電動工具は一般にドリル、ドライバ等の鋭利な先端工具が装着されているから、予期しないときにモータが回り始めてしまう問題がある。 FIG. 5 (a), but shows the on-off state of the trigger switch of the power tool, when the FET is turned on at time T 2, the DC power tool if the trigger switch is turned on The motor suddenly starts rotating. Since power tools are generally equipped with sharp tip tools such as drills and drivers, there is a problem that the motor starts to rotate unexpectedly.

一方、電池電圧が一旦、第１の所定電圧以下になったら、その後再び上昇して第２所定電圧以上になってもＦＥＴをオフ状態のままにしておくことも考えられるが、ドリルやドライバで作業している時には作業を途中で中断することは避けたいので、残っている電池で僅かな作業をやり終えてしまいたいという要求もある。   On the other hand, once the battery voltage has fallen below the first predetermined voltage, it may be possible to leave the FET off even if it rises again and then rises above the second predetermined voltage. Since we want to avoid interrupting the work halfway when working, there is also a demand to finish a little work with the remaining battery.

本発明の目的は、このような要求に適合した電動工具を提供することにある。   An object of the present invention is to provide a power tool that meets such requirements.

具体的には本発明は、リチウム電池を電源とする電動工具において、電池とモータを含む電流路にスイッチング素子としてＦＥＴを挿入し、リチウム電池の電圧が第１の所定値以下になったときにＦＥＴをオフ状態にすると共に、オフ状態の間に再び電池電圧が第２の所定電圧に達した場合には、モータを安全に再度回転させるようにした電動工具を提供することを目的とする。   Specifically, the present invention relates to an electric tool using a lithium battery as a power source, when an FET is inserted as a switching element in a current path including the battery and the motor, and the voltage of the lithium battery becomes equal to or lower than a first predetermined value. It is an object of the present invention to provide an electric tool that turns off a FET and safely rotates the motor again when the battery voltage reaches the second predetermined voltage again during the off state.

上記の目的を達成するために本発明は、複数個のリチウム電池セルよりなる電池組と、該電池組からスイッチング素子を介して駆動電流が供給される直流モータと、該直流モータの起動及び停止を制御するトリガスイッチとを備えた電動工具において、前記電池組の１個又は複数個の電池セルの電池電圧を検出する電圧検出手段と、該電圧検出手段からの検出信号を受け、前記スイッチング素子のオン・オフを制御する制御手段とを備え、該制御手段は、前記電池電圧が第１の所定電圧以下になったとき前記スイッチング素子をオフし、その後前記トリガスイッチがオフになった後に、前記電池電圧が第２の所定電圧以上になったとき前記スイッチング素子をオンするように制御することに一つの特徴を有する。   To achieve the above object, the present invention provides a battery set comprising a plurality of lithium battery cells, a DC motor to which a drive current is supplied from the battery set via a switching element, and starting and stopping of the DC motor. In the electric tool comprising a trigger switch for controlling the voltage, a voltage detection means for detecting a battery voltage of one or a plurality of battery cells of the battery set, a detection signal from the voltage detection means, and the switching element Control means for controlling on / off of the battery, and the control means turns off the switching element when the battery voltage falls below a first predetermined voltage, and then turns off the trigger switch, One characteristic is that the switching element is controlled to be turned on when the battery voltage becomes equal to or higher than a second predetermined voltage.

本発明の他の特徴は、複数個のリチウム電池セルよりなる電池組と、該電池組からスイッチング素子を介して駆動電流が供給される直流モータと、該直流モータの起動及び停止を制御するトリガスイッチとを備えた電動工具において、前記電池組の１個又は複数個の電池セルの電池電圧を検出する電圧検出手段と、該電圧検出手段からの検出信号を受け、前記スイッチング素子のオン・オフを制御するマイコンを備え、該マイコンは、前記電池電圧が第１の所定電圧以下になったときに前記スイッチング素子をオフに制御する第１のステップと、第１ステップの後に、前記トリガスイッチがオフ状態になったか否かを判定する第２のステップと、該トリガスイッチがオフになった後、前記電池電圧が第２の所定電圧以上になったか否かを判定する第３のステップと、第３ステップにより第２の所定電圧以上になったとき前記スイッチング素子をオン状態にする第４のステップとを含む制御プログラムを有することにある。   Another feature of the present invention is a battery set including a plurality of lithium battery cells, a DC motor to which a drive current is supplied from the battery set via a switching element, and a trigger for controlling start and stop of the DC motor. In the electric tool comprising a switch, voltage detecting means for detecting a battery voltage of one or a plurality of battery cells of the battery set, and a detection signal from the voltage detecting means, and on / off of the switching element A microcomputer for controlling the switching element when the battery voltage becomes equal to or lower than a first predetermined voltage; and after the first step, the trigger switch A second step of determining whether or not the battery has been turned off; and determining whether or not the battery voltage has become equal to or higher than a second predetermined voltage after the trigger switch is turned off. A third step that is to have a control program and a fourth step of the on-state the switching element when the third step equal to or higher than the second predetermined voltage.

本発明の他の特徴は、回転動力を発生する直流モータと、該直流モータの回転速度を減速する減速機構とを収容する本体胴体部と、該本体胴体部に連結されたハンドル部と、該ハンドル部の端部に装着され、複数個のリチウム電池セルよりなる電池組を収納する電池パックと、前記ハンドル部に設けられ、前記直流モータの起動、停止を操作するトリガスイッチとを備えた電動工具において、前記電池組から前記直流モータに供給する電流を制御する制御装置を備え、該制御装置は、前記電池組と前記直流モータとを含む電流路に接続されたスイッチング素子と、前記電池組の１個又は複数個の電池セルの電池電圧を検出する電圧検出手段とを有し、前記電池電圧が第１の所定電圧以下になったとき前記スイッチング素子をオフし、その後、前記トリガスイッチがオフになった後に、前記電池電圧が第２の所定電圧以上になったとき前記スイッチング素子をオンするように制御することにある。   Another feature of the present invention is that a main body body housing a direct current motor that generates rotational power, a speed reduction mechanism that reduces the rotational speed of the direct current motor, a handle portion connected to the main body body, A battery pack that is attached to the end of the handle portion and houses a battery set made of a plurality of lithium battery cells, and an electric motor provided with a trigger switch that is provided on the handle portion and operates to start and stop the DC motor The tool includes a control device that controls a current supplied from the battery set to the DC motor, the control device including a switching element connected to a current path including the battery set and the DC motor, and the battery set. Voltage detecting means for detecting the battery voltage of one or a plurality of battery cells, and turning off the switching element when the battery voltage falls below a first predetermined voltage, After serial trigger switch is turned off, is to control so as to turn on said switching element when said battery voltage is above a second predetermined voltage.

本発明の他の特徴は、前記スイッチング素子をＦＥＴより構成したことにある。
また、前記第２所定電圧を、前記第１所定電圧より大きい値に設定したことに他の特徴がある。 Another feature of the present invention resides in that the switching element is composed of an FET.
Another feature is that the second predetermined voltage is set to a value larger than the first predetermined voltage.

本発明によれば、リチウム電池よりなる電池組の電圧が過放電の限界値である第１の所定電圧以下になった後も、充電せずに断続的に電動工具を作動させることができるので、残余の作業が少ない場合には、電池組を過放電にすることなく作業を完成させることが可能となる。また、断続的に電動工具を作動させる際、突然モータが回転を始めるということがなく、必ずトリガスイッチの動作に応答してモータが回転するので、安全性においても優れている。   According to the present invention, the power tool can be operated intermittently without being charged even after the voltage of the battery set made of the lithium battery becomes equal to or lower than the first predetermined voltage which is the limit value of overdischarge. When there is little remaining work, it is possible to complete the work without overdischarging the battery set. In addition, when the electric tool is intermittently operated, the motor does not suddenly start rotating, and the motor always rotates in response to the operation of the trigger switch, which is excellent in safety.

以下、本発明にかかる電動工具の一実施例について、概略構成、過放電防止回路、過放電防止の制御フローの順に説明する。   Hereinafter, an embodiment of an electric power tool according to the present invention will be described in the order of a schematic configuration, an overdischarge prevention circuit, and an overdischarge prevention control flow.

（１）概略構成
図１は本発明にかかる電動工具の外観を示す。電動ドライバ、電動ドリル、電動レンチ等の電動工具２００は、本体胴体部２００Ａと、該本体胴体部２００Ａに連結されたハンドル部２００Ｂとから構成され、ハンドル部２００Ｂの端部からリチウム電池セルを収納した電池パック１が装着される。 (1) Schematic Configuration FIG. 1 shows the appearance of an electric tool according to the present invention. An electric tool 200 such as an electric screwdriver, an electric drill, and an electric wrench includes a main body body portion 200A and a handle portion 200B connected to the main body body portion 200A, and stores a lithium battery cell from an end portion of the handle portion 200B. The battery pack 1 is installed.

本体胴体部２００Ａのハウジングの中には、回転動力を発生する直流モータ（図示せず）、直流モータの回転速度を減速する減速機構部（図示せず）が収納され、その先端にはドリル、ドライバ等の先端工具３００が装着される。インパクト工具の場合には、減速機構部と先端工具３００との間にハンマ等の打撃機構部（図示せず）が設けられる。   In the housing of the main body body 200A, a direct current motor (not shown) that generates rotational power and a speed reduction mechanism (not shown) that reduces the rotational speed of the direct current motor are housed. A tip tool 300 such as a driver is mounted. In the case of an impact tool, an impact mechanism (not shown) such as a hammer is provided between the speed reduction mechanism and the tip tool 300.

電池パック１内には、例えば公称電圧３．６Ｖのリチウム電池セルが複数個収納される。例えば電動工具２００が１４．４Ｖで動作する場合は、４個の電池セルを直列接続した電池組が用いられる。電池パック１からの直流電圧は、ＦＥＴよりなるスイッチング素子を介して直流モータに供給され、リチウム電池の電圧が所定電圧以下になると、過放電を防止するためにスイッチング素子をオフするように構成されている。   In the battery pack 1, for example, a plurality of lithium battery cells having a nominal voltage of 3.6V are accommodated. For example, when the electric tool 200 operates at 14.4 V, a battery set in which four battery cells are connected in series is used. The DC voltage from the battery pack 1 is supplied to the DC motor via a switching element made of FET, and is configured to turn off the switching element to prevent overdischarge when the voltage of the lithium battery falls below a predetermined voltage. ing.

次に、リチウム電池セルよりなる電池組の過放電防止回路の具体例について説明する。   Next, a specific example of an overdischarge prevention circuit for a battery set composed of lithium battery cells will be described.

（２）過放電防止回路
本発明にかかる電動工具において、リチウム電池よりなる電池組の過放電を防止する回路としては、本出願人が先に出願した特願２００１−３５６５７６号（特開２００３−１６４０６６号）に記載された回路と類似の用いることができる。以下この回路について説明する。 (2) Overdischarge prevention circuit Japanese Patent Application No. 2001-356576 (Japanese Patent Application Laid-Open No. 2003-356576) filed earlier by the present applicant as a circuit for preventing overdischarge of a battery set made of a lithium battery in the electric power tool according to the present invention. 140666) can be used. This circuit will be described below.

図２は、電池パック１を電動工具２００に接続した状態の回路図である。電池パック１の正極端子２と負極端子３は、電動工具２００に設けられている正極端子２０１と負極端子２０２にそれぞれ接続されている。電動工具２００の正極端子２０１と負極端子２０２の間には、直流モータ２１０とスイッチ２２０が直列に接続されている。電池パック１には、電池セル１１〜１４を接続板で直列接続してなる電池組１０が内包されている。   FIG. 2 is a circuit diagram in a state where the battery pack 1 is connected to the electric tool 200. The positive electrode terminal 2 and the negative electrode terminal 3 of the battery pack 1 are respectively connected to a positive electrode terminal 201 and a negative electrode terminal 202 provided in the electric tool 200. A DC motor 210 and a switch 220 are connected in series between the positive terminal 201 and the negative terminal 202 of the electric tool 200. The battery pack 1 includes a battery set 10 formed by connecting battery cells 11 to 14 in series with a connection plate.

電池パック１と電動工具２００を接続して、電動工具２００のスイッチ２２０をオンにした場合に、電池組１０の正極端子から電動工具２００を介して電池組１０の負極端子に流れる放電電流経路が形成される。この経路には、スイッチ部２０，定電圧電源３０，電池電圧検出部４０，トリガ検出部８０が接続されている。これら各部は制御手段たるマイクロコンピュータ６０（以下、マイコン６０という。）に接続されている。電池パック１には、更に、電池温度検出部５０と表示部９０が含まれ、これらもマイコン６０に接続されている。   When the battery pack 1 and the power tool 200 are connected and the switch 220 of the power tool 200 is turned on, a discharge current path that flows from the positive terminal of the battery set 10 to the negative terminal of the battery set 10 via the power tool 200 is It is formed. A switch unit 20, a constant voltage power supply 30, a battery voltage detection unit 40, and a trigger detection unit 80 are connected to this path. These units are connected to a microcomputer 60 (hereinafter referred to as a microcomputer 60) as control means. The battery pack 1 further includes a battery temperature detection unit 50 and a display unit 90, which are also connected to the microcomputer 60.

マイコン６０は、中央処理装置（以下ＣＰＵ）６１、ＲＯＭ６２、ＲＡＭ６３、タイマ６４、Ａ／Ｄコンバータ６５、出力ポート６６、リセット入力ポート６７から構成され、これらは内部バスにより相互に接続されている。   The microcomputer 60 includes a central processing unit (hereinafter referred to as CPU) 61, a ROM 62, a RAM 63, a timer 64, an A / D converter 65, an output port 66, and a reset input port 67, which are mutually connected by an internal bus.

スイッチ部２０は、電池組１０の負極側と電池パック１の負極端子３の間に接続されており、マイコン６０の制御により、電動工具２００に流れる負荷電流をスイッチングするためのものである。スイッチ部２０は、ＦＥＴ２１、ダイオード２２及び抵抗２３、２４から構成されており、ＦＥＴ２１のゲートには抵抗２４を介してマイコン６０の出力ポート６６より制御信号が印加される。ＦＥＴ２１のソース・ドレイン間にはダイオード２２が接続されており、電池組１０の充電時の充電電流経路を構成している。   The switch unit 20 is connected between the negative electrode side of the battery set 10 and the negative electrode terminal 3 of the battery pack 1, and is for switching a load current flowing through the electric tool 200 under the control of the microcomputer 60. The switch unit 20 includes an FET 21, a diode 22, and resistors 23 and 24, and a control signal is applied to the gate of the FET 21 from the output port 66 of the microcomputer 60 via the resistor 24. A diode 22 is connected between the source and drain of the FET 21 to form a charging current path when the battery set 10 is charged.

電流検出部７０は、電池組１０に流れる電流を検出するためのものであり、入力側はダイオード２２のカソードとＦＥＴ２１のドレインの接続点に接続されており、出力側はマイコン６０のＡ／Ｄコンバータ６５に接続されている。   The current detector 70 is for detecting the current flowing through the battery set 10, the input side is connected to the connection point between the cathode of the diode 22 and the drain of the FET 21, and the output side is the A / D of the microcomputer 60. The converter 65 is connected.

電流検出部７０は、反転増幅回路と非反転増幅回路の両方を備えた構成で、ＦＥＴ２１のオン抵抗及びダイオード２２のオン電圧に基づき、その流れる電流の方向によって生じる電位を、反転増幅及び非反転増幅する。充電及び放電に対応して反転増幅回路または非反転増幅回路に出力が生じ、この出力に基づきマイコン６０のＡ／Ｄコンバータ６５はＡ／Ｄ変換をする。   The current detection unit 70 includes both an inverting amplifier circuit and a non-inverting amplifier circuit. Based on the on-resistance of the FET 21 and the on-voltage of the diode 22, the current detection unit 70 converts the potential generated by the direction of the flowing current to Amplify. An output is generated in the inverting amplifier circuit or the non-inverting amplifier circuit in response to charging and discharging, and the A / D converter 65 of the microcomputer 60 performs A / D conversion based on this output.

定電圧電源３０は、３端子レギュレータ３１、平滑コンデンサ３２、３３、リセットＩＣ３４から構成されており、定電圧電源３０から出力される定電圧ＶＣＣは、電池温度検出部５０、マイコン６０及び電流検出部７０、表示部９０の電源となる。リセットＩＣ３４はマイコン６０のリセット入力ポート６７に接続されており、マイコン６０を初期状態にするためにリセット入力ポート６７にリセット信号を出力する。 Constant voltage power supply 30, three-terminal regulator 31, a smoothing capacitor 32, 33 is constituted by a reset IC 34, a constant voltage V CC output from the constant-voltage power supply 30, battery temperature detection unit 50, the microcomputer 60 and the current detection Power supply for the unit 70 and the display unit 90. The reset IC 34 is connected to a reset input port 67 of the microcomputer 60, and outputs a reset signal to the reset input port 67 in order to put the microcomputer 60 into an initial state.

電池電圧検出部４０は、電池組１０の電池電圧を検出するためのもので、抵抗４１〜４３からなる。電池組１０の正極端子とアース間に直列接続された抵抗４１，４２の接続点は、抵抗４３を介してマイコン６０のＡ／Ｄコンバータ６５に接続されている。Ａ／Ｄコンバータ６５からは、検出した電池電圧に対応するデジタル値が出力され、マイコン６０のＣＰＵ６１は、当該デジタル値と後述する第１所定電圧及び第２所定電圧とを比較する。第１所定電圧と第２所定電圧はマイコン６０のＲＯＭ６２に記憶されている。   The battery voltage detection unit 40 is for detecting the battery voltage of the battery set 10 and includes resistors 41 to 43. The connection point of the resistors 41 and 42 connected in series between the positive terminal of the battery set 10 and the ground is connected to the A / D converter 65 of the microcomputer 60 via the resistor 43. A digital value corresponding to the detected battery voltage is output from the A / D converter 65, and the CPU 61 of the microcomputer 60 compares the digital value with a first predetermined voltage and a second predetermined voltage described later. The first predetermined voltage and the second predetermined voltage are stored in the ROM 62 of the microcomputer 60.

電池温度検出部５０は、電池組１０の近傍に配置して電池組１０の温度を検出するものであり、感温素子としてのサーミスタ５１、抵抗５２〜５４から構成されている。サーミスタ５１は抵抗５３を介してマイコン６０のＡ／Ｄコンバータ６５に接続されている。Ａ／Ｄコンバータ６５からは、検出した電池温度に対応するデジタル値が出力され、マイコン６０のＣＰＵ６１は、当該デジタル値と予め設定した所定値とを比較し、電池温度が異常高温であるかどうかの判断を行う。   The battery temperature detection unit 50 is disposed in the vicinity of the battery set 10 and detects the temperature of the battery set 10, and includes a thermistor 51 as a temperature sensitive element and resistors 52 to 54. The thermistor 51 is connected to the A / D converter 65 of the microcomputer 60 via the resistor 53. A digital value corresponding to the detected battery temperature is output from the A / D converter 65, and the CPU 61 of the microcomputer 60 compares the digital value with a preset predetermined value to determine whether the battery temperature is abnormally high. Make a decision.

トリガ検出部８０は抵抗８１、８２からなり、電動工具２００のスイッチ２２０のオン動作を検出する。スイッチ２２０がオンされれば、直流モータ２１０の直流抵抗は非常に小さい（数オーム程度）ので、ＦＥＴ２１のドレイン・ソース間にはほぼ電池電圧が印加され、この電圧を抵抗８１、８２で分圧してＡ／Ｄコンバータ６５へ入力し、スイッチ２２０のオン動作を検出している。   The trigger detection unit 80 includes resistors 81 and 82, and detects the ON operation of the switch 220 of the electric tool 200. When the switch 220 is turned on, the direct current resistance of the direct current motor 210 is very small (about several ohms), so that a battery voltage is almost applied between the drain and source of the FET 21, and this voltage is divided by the resistors 81 and 82. Are input to the A / D converter 65, and the ON operation of the switch 220 is detected.

表示部９０はＬＥＤ９１、抵抗９２からなり、マイコン６０の出力ポート６６の出力に応じてＬＥＤ９１の点灯、点滅制御を行っている。表示部９０は、たとえば、電池温度検出部５０で検出した電池温度が所定温度よりも高い場合には、電池温度異常表示を行う。   The display unit 90 includes an LED 91 and a resistor 92, and performs lighting and blinking control of the LED 91 according to the output of the output port 66 of the microcomputer 60. For example, when the battery temperature detected by the battery temperature detection unit 50 is higher than a predetermined temperature, the display unit 90 performs battery temperature abnormality display.

（３）過放電防止制御フロー
次に図３を参照して、本発明電動工具に用いられるリチウム電池組１０の過放電を防止するための制御フローの一実施例について説明する。この制御プログラムはマイコン６０のＲＯＭ６２に格納されており、ＣＰＵ６１により逐次読み出されて実行される。 (3) Overdischarge Prevention Control Flow With reference to FIG. 3, an embodiment of a control flow for preventing overdischarge of the lithium battery set 10 used in the electric tool of the present invention will be described. This control program is stored in the ROM 62 of the microcomputer 60, and is sequentially read and executed by the CPU 61.

まずＳ１０１で過放電フラグを０、ＦＥＴ２１をオフにイニシャルセットする。過放電フラグは電池組１０が過放電状態であるかどうかを示すフラグで、電池組１０の放電電圧が第１の所定電圧Ｖ１以下になったときに「１」がセットされ、Ｖ１より大きいときには「０」がセットされる。すなわちフラグが１の場合には、電池組１０が過放電状態であることを示し、０の場合には過放電状態にないことを示す。なお、第１の所定電圧Ｖ１の値は、公称電圧が３．６Ｖのリチウム電池の場合、２Ｖ〜２．５Ｖの範囲の適当な電圧が選定され、例えば２．３Ｖに設定される。 First, in S101, the overdischarge flag is set to 0 and the FET 21 is initially set to OFF. Overdischarge flag is a flag that indicates whether the battery 10 is overdischarged state, "1" is set when the discharge voltage of the battery 10 becomes a first predetermined voltages V 1 or less, than the V 1 When it is larger, “0” is set. That is, when the flag is 1, it indicates that the battery set 10 is in an overdischarge state, and when it is 0, it indicates that the battery set 10 is not in an overdischarge state. The first value of the predetermined voltages V 1 is the nominal voltage of the lithium battery of 3.6V, is selected the appropriate voltage in the range of 2V～2.5V, it is set to, for example, 2.3V.

次いでステップＳ１０２において、過放電フラグが１であるか否かを判別する。最初はステップＳ１０１で過放電フラグは０にセットされているのでステップＳ１０３に進む。ステップＳ１０３において、トリガ検出部８０の出力に基づいて、電動工具２００のスイッチ２２０がオンされたか否かの判別を行う。スイッチ２２０がオンされればＦＥＴ２１のドレイン・ソース間にほぼ電池電圧が印加されるので、ＦＥＴ２１のドレイン・ソース間電圧ＶＤＳに基づきスイッチ２２０のオン動作の検出が可能になる。 Next, in step S102, it is determined whether or not the overdischarge flag is 1. At first, since the overdischarge flag is set to 0 in step S101, the process proceeds to step S103. In step S103, based on the output of the trigger detection unit 80, it is determined whether or not the switch 220 of the electric power tool 200 is turned on. When the switch 220 is turned on, a battery voltage is substantially applied between the drain and source of the FET 21, so that the on operation of the switch 220 can be detected based on the drain-source voltage V DS of the FET 21.

スイッチ２２０がオンされた場合は、ステップＳ１０５に進み、出力ポート６６の出力に従い、スイッチ部２０のＦＥＴ２１をオンにすることで電池が放電される。   When the switch 220 is turned on, the process proceeds to step S105, and the battery is discharged by turning on the FET 21 of the switch unit 20 according to the output of the output port 66.

次いで、ステップＳ１０６で電池電圧が第１の所定電圧Ｖ１以下になったか否かが判定され、Ｖ１以下になると、ステップＳ１０７で過放電フラグが１にセットされ、更にステップＳ１０８で電池が過放電状態になったことが表示される。そしてステップＳ１０９において再びＦＥＴ２１をオフ状態とし、ステップＳ１０２に戻る。 Then, the battery voltage at step S106, it is determined whether it is the first predetermined voltages V 1 or less, at the V 1 or less, over-discharge flag is set to 1 at step S107, the battery further at step S108 over It is displayed that the battery is discharged. In step S109, the FET 21 is turned off again, and the process returns to step S102.

通常は、作業者は過放電表示がされると（ＦＥＴ２１がオフになると）、電池パック１を電動工具２００から取り出し、図示しない充電器に接続して、充電後使用する。電池組１０が充電されたかどうかの判定は、電池組１０に流れる電流の向きを検出することにより行われる。即ち、充電電流はダイオード２２を介して電池組１０の正極側から負極側に流れるので、電流検出部７０が検出した電流の方向に従い、充電がされたかどうかの判別をしている。   Normally, when an overdischarge display is made (when the FET 21 is turned off), the operator takes out the battery pack 1 from the electric tool 200, connects it to a charger (not shown), and uses it after charging. Whether the battery set 10 is charged is determined by detecting the direction of the current flowing through the battery set 10. That is, since the charging current flows from the positive electrode side to the negative electrode side of the battery set 10 via the diode 22, it is determined whether or not charging has been performed according to the direction of the current detected by the current detection unit 70.

ステップＳ１０９でＦＥＴ２１をオフ状態にして電池組１０の放電を停止すると、充電をしなくても電池電圧は再び徐々に上昇する。また、ステップＳ１０６で電池電圧が第１の所定電圧Ｖ１以下でないときはステップＳ１０３に戻り、スイッチ２２０とＦＥＴ２１がオン状態で、電池電圧が第１の所定電圧Ｖ１以下でないときに、途中でスイッチ２２０がオフされた場合には、ステップＳ１０４でＦＥＴ２１をオフ状態にしている。 When the FET 21 is turned off in step S109 to stop the discharge of the battery set 10, the battery voltage gradually increases again without being charged. Furthermore, the process returns to step S103 when the battery voltage in step S106 is not the first predetermined voltages V 1 or less, in the on-state switch 220 and FET 21, when the battery voltage is not the first predetermined voltages V 1 or less, in the middle If the switch 220 is turned off, the FET 21 is turned off in step S104.

ステップＳ１０２で過放電フラグが１であると判定されると、ステップＳ１１０に進み、電池電圧が第２の所定電圧Ｖ２以上になったか否かが判定される。このＶ２の値は、公称電圧が３．６Ｖのリチウム電池の場合、例えば２．５Ｖ〜３．０Ｖの範囲の適当な値が選ばれる。ステップＳ１１０の判定が否定（ＮＯ）の場合は、ＦＥＴ２１はオフ状態を維持するが、肯定（ＹＥＳ）の場合は、ステップＳ１１１，Ｓ１１２に進み、過放電フラグを０にセットし、過放電表示もオフにする。 When the over-discharge flag in step S102 is judged to be 1, the process proceeds to step S110, whether the battery voltage reaches the second predetermined voltage V 2 or more is determined. The value of this V 2, if the nominal voltage is lithium battery 3.6V, for example, a suitable value in the range of 2.5V~3.0V selected. If the determination in step S110 is negative (NO), the FET 21 remains off, but if the determination is affirmative (YES), the process proceeds to steps S111 and S112, the overdischarge flag is set to 0, and the overdischarge display is also displayed. Turn off.

従来は、電池電圧がＶ２を超えるとＦＥＴ２１をオン状態にしていたが、本発明ではその後、ステップＳ１１３に進みスイッチ２２０がオン状態か否かを判定し、その判定が否定（ＮＯ）になるまで待機する。つまり、電池電圧がＶ２を超えたときに突然モータが回り出すことがないように、一旦スイッチ２２０がオフ状態にされるまで待機する。 Conventionally, the battery voltage had to the ON state FET21 exceeds V 2, then in the present invention, the switch 220 proceeds to step S113 it is determined whether the ON state, the determination is negative (NO) Wait until. In other words, so as not to out around suddenly motor when the battery voltage exceeds V 2, once waits until the switch 220 is turned off.

ステップＳ１１３の判定が否定（ＮＯ）になると、前述のステップＳ１０２に戻り、再び過放電フラグが１か否か判定され、上記した一連の動作（ステップＳ１０２〜ステップＳ１１３）を繰り返す。   If the determination in step S113 is negative (NO), the process returns to step S102 described above, and it is determined again whether or not the overdischarge flag is 1, and the above-described series of operations (steps S102 to S113) is repeated.

上記の動作を図４を用いて説明する。スイッチ２２０及びＦＥＴ２１がオン状態の場合、電池電圧は低下する。時点Ｔ１で電池電圧が第１の所定電圧Ｖ１以下となるためＦＥＴ２１がオフ状態になり、電池組１０の放電を停止すると、充電をしなくても電池電圧は再び徐々に上昇する。時点Ｔ２で電池電圧は第２の所定電圧Ｖ２を超えるが、このＴ２の時点ではスイッチ２２０はオン状態にあるので、スイッチ２２０がオフ状態にならない限りステップＳ１１３を抜け出ることはできない。従って、時点Ｔ２ではまだＦＥＴ２１はオンにならない。図４（ａ）に示すように、スイッチ２２０がオフ状態になりステップＳ１１３を抜け出た後に、ステップＳ１０３でスイッチ２２０が再びオン状態になると初めてステップＳ１０４に進み、ＦＥＴ２１がオンになる。従って図４（ｃ）に示すように、時点Ｔ３で再びＦＥＴ２１がオン状態になる。また、図４（ｂ）に示すように時点Ｔ４において再び電池電圧が第１の所定電圧Ｖ１以下となるため、図４（ｃ）のようにＦＥＴ２１は再びオフ状態になる。 The above operation will be described with reference to FIG. When the switch 220 and the FET 21 are on, the battery voltage decreases. FET21 for battery voltage at time T 1 is a first predetermined voltages V 1 or less is turned off, stopping the discharge of the battery 10, the battery voltage even without charge gradually increases again. The battery voltage at the time T 2 is greater than the second predetermined voltage V 2, since at the time of this T 2 switch 220 is in the ON state, the switch 220 can not exit the step S113 unless the OFF state. Thus, at time point T 2 yet FET21 will not turn on. As shown in FIG. 4A, after the switch 220 is turned off and exits step S113, when the switch 220 is turned on again in step S103, the process proceeds to step S104 for the first time, and the FET 21 is turned on. Accordingly, as shown in FIG. 4 (c), again FET21 are turned on at time T 3. Further, since the re battery voltage at time T 4 as shown in FIG. 4 (b) is the first predetermined voltages V 1 or less, FET 21 as shown in FIG. 4 (c) is turned off again.

上述の一連の動作（ステップＳ１０２〜Ｓ１１３）は、リチウム電池が完全な過放電状態にならずに、短時間放置すれば、電池電圧が第２所定電圧まで上昇する間は継続して行うことができる。従って、電動工具による作業があと僅かで終了するというような場合は、電池を充電器により充電をせずに、残余の電池電圧を使って作業を完了させることが可能となる。   The series of operations described above (steps S102 to S113) can be continuously performed while the battery voltage rises to the second predetermined voltage if the lithium battery is left in a short time without being completely overdischarged. it can. Therefore, in the case where the work with the power tool is to be completed in a short time, the work can be completed using the remaining battery voltage without charging the battery with the charger.

すなわち図２，図３のような構成及び制御によれば、リチウム電池が過放電状態になることを確実に防止し、サイクル寿命の向上を図れるだけでなく、過放電状態になる僅か前の残余の電池電圧を有効に且つ安全に使うことができる。   That is, according to the configuration and control as shown in FIG. 2 and FIG. 3, not only can the lithium battery be prevented from being overdischarged, the cycle life can be improved, but the residual just before the overdischarge state can be achieved. The battery voltage can be used effectively and safely.

本発明にかかる電動工具の外観図である。It is an external view of the electric tool concerning this invention. 本発明にかかる電動工具の電池パックとモータとの接続回路図である。It is a connection circuit diagram of the battery pack and motor of the electric tool concerning this invention. 本発明にかかる電動工具の電池パックの制御フローの一実施例を示すフローチャートである。It is a flowchart which shows one Example of the control flow of the battery pack of the electric tool concerning this invention. 本発明にかかる電動工具の動作波形図である。It is an operation | movement waveform diagram of the electric tool concerning this invention. 従来の電動工具の動作説明用波形図である。It is a wave form diagram for operation | movement description of the conventional electric tool.

符号の説明Explanation of symbols

１：電池パック
１０：電池組
２０：スイッチ部
２１：ＦＥＴ
３０：定電圧電源
４０：電池電圧検出部
５０：電池温度検出部
６０：マイコン
７０：電流検出部
８０：トリガ検出部
９０：表示部
２００：電動工具
２１０：モータ
２２０：スイッチ
1: Battery pack 10: Battery set 20: Switch unit 21: FET
30: Constant voltage power supply 40: Battery voltage detection unit 50: Battery temperature detection unit 60: Microcomputer 70: Current detection unit 80: Trigger detection unit 90: Display unit 200: Electric tool 210: Motor 220: Switch

Claims (7)

複数個のリチウム電池セルよりなる電池組と、該電池組からスイッチング素子を介して駆動電流が供給される直流モータと、該直流モータの起動及び停止を制御するトリガスイッチとを備えたコードレス電動工具において、前記電池組の１個又は複数個の電池セルの電池電圧を検出する電圧検出手段と、該電圧検出手段からの検出信号を受け、前記スイッチング素子のオン・オフを制御する制御手段とを備え、該制御手段は、前記電池電圧が第１の所定電圧以下になったとき前記スイッチング素子をオフし、その後前記トリガスイッチがオフになった後に、前記電池電圧が第２の所定電圧以上になったとき前記スイッチング素子をオンするように制御することを特徴とするコードレス電動工具。   A cordless electric tool comprising: a battery set comprising a plurality of lithium battery cells; a DC motor to which a drive current is supplied from the battery set via a switching element; and a trigger switch for controlling start and stop of the DC motor A voltage detection means for detecting a battery voltage of one or a plurality of battery cells of the battery set; and a control means for receiving a detection signal from the voltage detection means and controlling on / off of the switching element. And the control means turns off the switching element when the battery voltage falls below a first predetermined voltage, and then turns off the trigger switch and then turns the battery voltage above a second predetermined voltage. A cordless power tool that controls the switching element to be turned on when it becomes. 複数個のリチウム電池セルよりなる電池組と、該電池組からスイッチング素子を介して駆動電流が供給される直流モータと、該直流モータの起動及び停止を制御するトリガスイッチとを備えたコードレス電動工具において、前記電池組の１個又は複数個の電池セルの電池電圧を検出する電圧検出手段と、該電圧検出手段からの検出信号を受け、前記スイッチング素子のオン・オフを制御するマイコンを備え、該マイコンは、前記電池電圧が第１の所定電圧以下になったときに前記スイッチング素子をオフに制御する第１のステップと、第１ステップの後に、前記トリガスイッチがオフ状態になったか否かを判定する第２のステップと、該トリガスイッチがオフになった後、前記電池電圧が第２の所定電圧以上になったか否かを判定する第３のステップと、第３ステップにより第２の所定電圧以上になったとき前記スイッチング素子をオン状態にする第４のステップとを含む制御プログラムを有することを特徴とするコードレス電動工具。   A cordless electric tool comprising: a battery set comprising a plurality of lithium battery cells; a DC motor to which a drive current is supplied from the battery set via a switching element; and a trigger switch for controlling start and stop of the DC motor A voltage detecting means for detecting a battery voltage of one or a plurality of battery cells of the battery set, and a microcomputer for receiving a detection signal from the voltage detecting means and controlling on / off of the switching element, The microcomputer includes: a first step for controlling the switching element to be turned off when the battery voltage becomes equal to or lower than a first predetermined voltage; and whether the trigger switch is turned off after the first step. And a third step of determining whether or not the battery voltage has become equal to or higher than a second predetermined voltage after the trigger switch is turned off. Step a cordless power tool, characterized in that it comprises a control program and a fourth step of the on-state the switching element when the third step equal to or higher than the second predetermined voltage. 回転動力を発生する直流モータと、該直流モータの回転速度を減速する減速機構とを収容する本体胴体部と、該本体胴体部に連結されたハンドル部と、該ハンドル部の端部に装着され、複数個のリチウム電池セルよりなる電池組を収納する電池パックと、前記ハンドル部に設けられ、前記直流モータの起動、停止を操作するトリガスイッチとを備えたコードレス電動工具において、前記電池組から前記直流モータに供給する電流を制御する制御装置を備え、該制御装置は、前記電池組と前記直流モータとを含む電流路に接続されたスイッチング素子と、前記電池組の１個又は複数個の電池セルの電池電圧を検出する電圧検出手段とを有し、前記電池電圧が第１の所定電圧以下になったとき前記スイッチング素子をオフし、その後、前記トリガスイッチがオフになった後に前記電池電圧が第２の所定電圧以上になったとき前記スイッチング素子をオンするように制御することを特徴とするコードレス電動工具。   A main body body housing a DC motor that generates rotational power, a speed reduction mechanism that decelerates the rotational speed of the DC motor, a handle portion connected to the main body body portion, and an end of the handle portion. A cordless electric tool comprising: a battery pack that houses a battery set composed of a plurality of lithium battery cells; and a trigger switch that is provided on the handle and operates to start and stop the DC motor. A control device for controlling a current supplied to the DC motor, the control device comprising: a switching element connected to a current path including the battery set and the DC motor; and one or more of the battery set. Voltage detecting means for detecting a battery voltage of the battery cell, the switching element is turned off when the battery voltage falls below a first predetermined voltage, and then the trigger Cordless power tool, characterized in that switch is controlled to turn on the switching element when said battery voltage after turned off reaches or exceeds a second predetermined voltage. 回転動力を発生する直流モータと、該直流モータの回転速度を減速する減速機構とを収容する本体胴体部と、該本体胴体部に連結されたハンドル部と、該ハンドル部の端部に装着され、複数個のリチウム電池セルよりなる電池組を収納する電池パックと、前記ハンドル部に設けられ、前記直流モータの起動、停止を操作するトリガスイッチとを備えたコードレス電動工具において、前記電池組から前記直流モータに供給する電流路に接続されたスイッチング素子を制御するマイコンを備え、該マイコンは、前記電池電圧が第１の所定電圧以下になったときに前記スイッチング素子をオフに制御する第１のステップと、第１ステップの後に、前記トリガスイッチがオフ状態になったか否かを判定する第２のステップと、該トリガスイッチがオフになった後、前記電池電圧が第２所定電圧以上になったか否かを判定する第３のステップと、第３ステップにより第２所定電圧以上になったとき、前記スイッチング素子をオン状態にする第４のステップとを含む制御プログラムを有することを特徴とするコードレス電動工具。   A main body body housing a DC motor that generates rotational power, a speed reduction mechanism that decelerates the rotational speed of the DC motor, a handle portion connected to the main body body portion, and an end of the handle portion. A cordless electric tool comprising: a battery pack that houses a battery set composed of a plurality of lithium battery cells; and a trigger switch that is provided on the handle and operates to start and stop the DC motor. The microcomputer includes a microcomputer that controls a switching element connected to a current path that supplies the DC motor, and the microcomputer controls the switching element to be turned off when the battery voltage becomes equal to or lower than a first predetermined voltage. A second step for determining whether the trigger switch is turned off after the first step, and the trigger switch is turned off. A third step of determining whether or not the battery voltage has become equal to or higher than a second predetermined voltage; and when the battery voltage becomes equal to or higher than the second predetermined voltage in the third step, A cordless power tool comprising a control program including four steps. 複数個のリチウム電池セルよりなる電池組と、該電池組からスイッチング素子を介して駆動電流が供給される直流モータと、該直流モータの起動及び停止を制御するトリガスイッチとを備えたコードレス電動工具において、前記電池組の１個又は複数個の電池セルの電池電圧を検出する電圧検出手段と、該電圧検出手段からの検出信号を受け、前記スイッチング素子のオン・オフを制御する制御手段を備え、該制御手段は、前記電池電圧が第１の所定電圧以下になったとき前記スイッチング素子をオフするステップと、第２の所定電圧以上になったとき前記スイッチング素子をオンするステップを有し、第１ステップの後、前記トリガスイッチがオフ状態になったときだけ第２ステップに進むように制御することを特徴とするコードレス電動工具。   A cordless electric tool comprising: a battery set comprising a plurality of lithium battery cells; a DC motor to which a drive current is supplied from the battery set via a switching element; and a trigger switch for controlling start and stop of the DC motor And a voltage detection means for detecting a battery voltage of one or a plurality of battery cells of the battery set, and a control means for receiving a detection signal from the voltage detection means and controlling on / off of the switching element. The control means includes a step of turning off the switching element when the battery voltage becomes equal to or lower than a first predetermined voltage, and a step of turning on the switching element when the battery voltage becomes equal to or higher than a second predetermined voltage. After the first step, the cordless electric motor is controlled so as to proceed to the second step only when the trigger switch is turned off. Ingredients. 請求項１乃至５のいずれか１項において、前記スイッチング素子はＦＥＴより構成されていることを特徴とするコードレス電動工具。   The cordless electric tool according to claim 1, wherein the switching element is formed of an FET. 請求項１乃至５のいずれか１項において、前記第２所定電圧は前記第１所定電圧より大きい値に設定されていることを特徴とするコードレス電動工具。
The cordless power tool according to any one of claims 1 to 5, wherein the second predetermined voltage is set to a value larger than the first predetermined voltage.
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