JP4124041B2 - 充電機能付き直流電源装置 - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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Description
【発明が属する技術分野】
本発明は着脱可能な電池パックを電源とするコードレス電動工具(以下単に電動工具という)に着脱可能なアダプタを有するケーブルを介して直流電圧を供給可能にすると共に電池パックを充電可能な充電機能付き直流電源装置に関するものである。
【0002】
【従来の技術】
従来、電動工具は電源ケーブルによる作業上の制約は無く、どのような場所においても作業できるというメリットを有しているが、蓄電池の容量が低下すると蓄電池を充電するか別の充電済み蓄電池と交換しなければならないという問題があった。そこで、作業場所と交流電源設置場所が近く作業中の移動が少ない場合には交流を直流に変換する直流電源を用い、作業場所と交流電源設置場所が遠く作業中の移動が多い場合には蓄電池を用い、作業状況に合わせて電動工具の電源として電池パックと直流電源を併用していた。
【0003】
しかし、作業場所に充電器と直流電源を持ち込まなければ効率のよい作業ができないという問題がある。これらの問題を解決する案として特開平5−56566号公報に、電動工具用の電源スイッチがオンの時に蓄電池の充電と電動工具の駆動を同時に行い、電源スイッチがオフの時に蓄電池の充電のみを行う充電機能付き直流電源装置について記載されている。
【特許文献1】
特開平5−56566号公報
【発明が解決しようとする課題】
このような充電機能付き直流電源装置においては、接続される電動工具が起動された場合に早急に適切な電力を供給する必要があるため、スイッチング電源を電動工具側の要求電圧にあわせた電圧値の定電圧制御を掛けた状態で常に動作させておく必要がある。一方充電される蓄電池の電圧は必ずしも電動工具本体の要求電圧と同一ではない。電動工具本体の電圧が蓄電池の電圧よりも高かった場合、充電出力開閉手段を閉じて充電を開始すると、電源側の定電圧制御電圧と電池電圧の差により充電電流開閉手段が閉じた瞬間に突入電流が充電出力開閉手段に流れるため、充電出力開閉手段の寿命等の性能に影響を及ぼすことがある。
【0004】
本発明の目的は、上記した従来技術の欠点をなくし、充電出力開閉手段が閉じた際の突入電流を小さくなるようにした充電機能付き直流電源装置を提供することである。
【0005】
【課題を解決するための手段】
上記目的は、アダプタが装着された場合に、出力電圧設定手段の複数個の設定値のうち電動工具の駆動に必要な第1の設定値を選択し、電池パックが充電可能な場合には充電出力開閉手段を閉じて充電を開始する前に、電池電圧検出手段により電池電圧を検出し、前記選択した第1の設定値が検出した電池電圧より高い場合には電池電圧より低い値となる第2の設定値を選択し、スイッチング電源の出力電圧が電池電圧よりも低い値になってから充電電流開閉手段を閉じて充電を開始することにより達成される。
【0006】
【発明の実施の形態】
図1は本発明の一実施形態を示すブロック回路図である。1は交流電源、2は電池パックで、複数の蓄電池を直列接続した電池組2a及び電池組2aに接触または近接して電池温度を検出する感温素子2bを有する。3は電池パック2に流れる充電電流を開閉するリレー等の充電出力開閉手段で、後述するマイコン13の出力ポート13fの出力とトリガ検出手段23の出力のANDをとるアンドゲート24の出力信号によりその開閉が制御される。4は充電出力開閉手段3と電池パック2との間であって充電電流の流れる方向に直列に接続されたダイオード、5は電池パック2に流れる充電電流及び後述する電動工具22に流れる負荷電流を検出する電流検出手段、6は電源出力を定電圧または定電流に制御するための帰還信号をPWM制御IC9cに伝達するフォトカプラ等からなる電源制御信号伝達手段、7は後述する定電流制御手段14と定電圧制御手段16からの帰還信号を切り替える帰還信号切り替え手段、8は全波整流回路8aと平滑用コンデンサ8bからなる一次側整流平滑回路、9は高周波トランス9a、MOSFET等の半導体スイッチ9b、PWM制御IC9cからなるスイッチング回路で、PWM制御IC9cは半導体スイッチ9bの駆動パルス幅を変えて二次側整流平滑回路10の出力電圧を調整するスイッチング電源ICである。10はダイオード10a、10b、チョークコイル10c、平滑用コンデンサ10d、及びコンデンサ10dの放電用抵抗10eからなる二次側整流平滑回路、11は抵抗11a、11bからなる電源出力電圧検出手段で二次側整流平滑回路10の出力電圧を分圧する。12は抵抗12a、12bからなる電池電圧検出手段で、電池パック2の端子電圧を分圧する。13は演算手段(CPU)13a、ROM13b、RAM13c、タイマ13d、A/Dコンバータ13e、出力ポート13f、リセット入力ポート13gからなるマイクロコンピュータ(以下マイコン)である。14は演算増幅器14a、14b、抵抗14c〜14fからなる充電電流を定電流に制御する充電電流制御手段、15は出力ポート13fからの信号に対応して演算増幅器14bの反転入力端に印加する電圧値を変えることにより、充電電流を複数の設定値に切り替える充電電流設定手段、16は演算増幅器16a、抵抗16b、16cからなる定電圧制御手段、17は出力ポート13fからの信号に対応して演算増幅器16aの反転入力端に印加する電圧値を変えることにより、二次側整流平滑回路10の出力電圧を複数の設定値に切り替える定電圧設定手段、18は電源トランス18a、全波整流回路18b、3端子レギュレータ18d、平滑コンデンサ18c、リセットIC18eからなる定電圧電源で、マイコン13、充電電流制御手段14、定電圧制御手段16等の電源となる。リセットIC18eはマイコン13を初期状態にするために定電圧電源18の出力電圧の立ち上がり時にリセット入力ポート13gにリセット信号を出力する。19は電池パック2の感温素子2bの抵抗値を電圧に変換しA/Dコンバータ13eに出力する抵抗19a及び19bとからなる電池温度検出手段である。20はFETを用いた電源出力開閉手段、21は電動工具22と充電装置3を接続するためのアダプタを備えたケーブルで、電動工具22の要求電圧に合わせて作業者が切り替えを行う出力電圧切り替えスイッチ21aを備える。22は接続された電動工具であり、起動停止を行うスイッチ22a及び駆動源であるモータ22bを内蔵する。23は分圧抵抗23a、23b、トリガ検出回路23cより構成される電動工具22の起動を検出するトリガ検出手段で、充電前にはマイコン13の出力ポート13fの信号により、電源出力開閉手段20を開き、充電と電動工具22への電源供給を同時にできないようにする。また分圧抵抗23a、23bにより分圧された電圧の電圧変化により電動工具22の起動を検出すると、電源出力信号を出力し電源出力開閉手段20を閉じて電動工具22への電源の供給を行うと共に電動工具22への電源供給中の充電を禁止する充電禁止信号をアンドゲート24に出力する。アンドゲート24はマイコン13の出力ポート13fからの充電出力開閉信号とトリガ検出回路23からの充電禁止信号のANDをとり充電出力開閉手段3の開閉を行う。
【0007】
電池パック2を充電する際の動作の一例を図2のフローチャート、図3(a)のタイムチャートにより説明する。まず電源投入後リセットIC18eからの信号によりマイコン13がリセットされリセット解除後初期設定を行う(ステップ201、図3T0)。初期設定時においては定電圧設定手段17の設定値は二次側整流平滑回路10の出力電圧が図4に示す最も低いV1(例えば8V)になるように設定される。次に出力電圧切り替えスイッチ21aの値をA/Dコンバータ13eにより読み込みアダプタ21があると判断すれば(ステップ202)、定電圧設定手段17の設定値を変更し出力電圧を作業者の設定した値(ここではV4(16V))に設定する(ステップ203、図3Ta)。次に電池電圧検出手段12からの信号をA/Dコンバータ13eにより検出し電池パック2の挿入を監視する(ステップ204)。電池パック2が挿入されていない場合は、電動工具22の起動をトリガ検出回路23からの出力により判別する(ステップ205)。電動工具22が起動し動作している場合は、電動工具22使用時における処理を行い(ステップ206)、ステップ204まで戻る。ステップ205において、電動工具22が動作していない時もステップ204まで戻る。ステップ204において電池パック2が挿入された場合は、電池電圧検出手段12、電池温度検出手段19の出力により電池電圧と温度をA/Dコンバータ13eにより検出し、充電可能な電池パック2であるかどうかの判別を行う(ステップ207)。充電可能な電池パック2であるかどうかの判別は、例えば電池温度が所定温度以上の場合は、サイクル寿命の劣化を防ぐために充電不可能と判別すればよい。充電可能な電池パック2であった場合は、電池パック2の初期電池電圧(図3、V0)と現在の出力電圧をそれぞれ電池電圧検出手段12、電源出力電圧検出手段11の出力から読み込み比較を行う(ステップ208)。電源出力電圧が初期電池電圧V0よりも高かった場合には、図4に示す複数個の出力電圧設定値の中から初期電池電圧V0よりも低い設定値(ここではV2(11V))を選択し、定電圧設定手段17を設定する(ステップ209)。電圧設定値がV2に変更されると二次側整流平滑回路10の出力電圧は徐々に下がり始める(図3Tb)。この間、マイコン13は例えば図4に示すような出力電圧設定値と初期電池電圧V0の関係によって決まる所定の時間Tw(図3(a))待機し(ステップ210)、その後充電電流開閉手段3を閉じる信号をポート13fより出力する(ステップ211)。充電電流開閉手段3を閉じる信号がAND回路24より出力されると、帰還信号切り替え手段7は充電電流制御手段14側に切り替わりスイッチング回路9は定電流制御となる。ステップ208において二次側整流平滑回路10の出力電圧が電池電圧よりも低かった場合は、すぐに充電電流開閉手段3を閉じて充電を開始する。充電出力開閉手段3が例えば電磁式リレーであった場合は、充電開始の信号により数ms後リレー接点が閉じる。この時、出力電圧は電池電圧よりも低いため、二次側平滑回路10側から電池パック2側への突入電流は流れない。また、ダイオード4により電池パック2側から二次側平滑回路10側への逆方向の突入電流も防ぐことができるため、充電出力開閉手段3の突入電流による性能への影響を防ぐことができる。また充電出力開閉手段3には電磁式リレーの他に、半導体スイッチング素子を用いることも可能であり、この場合は半導体スイッチング素子の整流特性を利用することができるためダイオード4を削除することも可能である。リレー接点が閉じると(図3Tc)、定電流設定手段15にて設定された値の充電電流で充電を行う(ステップ211)。充電が開始された後は、電動工具22が起動された時に備え定電圧設定値を元の値V4に変更する(ステップ212)。この際、定電圧制御手段16の出力は帰還信号切り替え手段7により遮蔽されスイッチングIC9cには伝達されない。充電を開始すると、トリガ検出回路23からの出力により電動工具22の起動があったかどうかを常に監視しながら(ステップ213)、電池電圧のピーク値からの電圧降下を検出する−ΔV方式、満充電近辺での電池温度勾配を検出するdT/dt方式等の満充電検出法により満充電となるまで充電を行い、満充電と判断すると(ステップ214)、充電電流開閉手段3を開き充電を停止し(ステップ215、図3Td)その後ステップ202まで戻る。ステップ213において電動工具22が起動されたと判別された場合は、電動工具22が動作中か否かを判別し(ステップ216)、電動工具22が動作中の場合は、トリガ検出手段23により充電出力開閉手段3を開くと共に電源出力開閉手段20を閉じ、帰還信号切り替え手段7が定電圧制御手段16側に切り替わり電動工具22への電力供給へと切り替わる。マイコン13側では出力ポート13fの状態により電動工具22が起動したことを検出し、電動工具22が動作している間は充電を停止すると共に電動工具22使用時における処理を行い、ステップ216に戻る(ステップ217)。ステップ216において電動工具22の動作が停止したと判別した場合は、停止した後所定の時間が経過したか否かを判別する(ステップ218)。所定時間経過した場合は、ステップ213に戻り、電動工具22が起動したか否かを判断した上でその後充電を再開する。所定時間経過していないと判別された場合は、ステップ216に戻り、所定時間経過するまで充電させない。
【0008】
図3(b)は前記出力電圧が高いままでリレー接点を閉じた場合の動作波形である。充電出力開閉手段3のリレー接点が閉じた瞬間に非常に大きな突入電流が電源側から電池パック2側に流れ込むため、リレー接点延いてはリレー等の寿命等の性能に影響を及ぼすこととなる。
【0009】
【発明の効果】
以上のように、充電開始時の電源の出力電圧を制御することにより、充電開始時における充電電流開閉手段への突入電流をなくすことができ、突入電流による充電電流開閉手段の寿命等の性能への影響を防ぐことができる。
【図面の簡単な説明】
【図1】本発明充電機能付き直流電源装置の一実施形態を示すブロック回路図。
【図2】本発明電源装置による充電開始時における出力電圧制御の動作を説明するフローチャート。
【図3】本発明電源装置の充電開始前及び充電中の電源出力電圧、充電電流を示すタイムチャート。
【図4】本発明電源装置の充電開始前時の出力電圧と電池電圧差によって決まる待ち時間の例と示す表。
【符号の説明】
2は電池パック、3は充電電流開閉手段、4はダイオード、7は帰還信号切り替え手段、10は二次側整流回路、11は電源出力電圧検出手段、12は電池電圧検出手段、13はマイコン、14は充電電流制御手段、16は定電圧制御手段、17は定電圧設定手段、20は電源出力開閉手段、21はケーブル、22はコードレス工具、23はトリガ検出手段、24はアンドゲート。
Claims (1)
- 着脱可能な電池パックを電源とするコードレス電動工具に着脱可能なアダプタを有するケーブルを介して直流電圧を供給し、かつ電池パックを充電する充電機能付き直流電源装置であって、
出力電圧を発生するスイッチング電源と、コードレス電動工具の動作スイッチのオン・オフ状態を検出するトリガ検出手段と、トリガ検出手段により電動工具の動作スイッチのオン状態を検出した場合にコードレス電動工具に電源出力の供給をオンする電源出力開閉手段と、トリガ検出手段により電動工具の動作スイッチのオフ状態を検出した場合に電池パックに充電出力をオンする充電出力開閉手段と、スイッチング電源の出力電圧を制御する出力電圧制御手段と、出力電圧制御手段の基準値を複数の値に設定する出力電圧設定手段と、スイッチング電源の出力電圧を検出する出力電圧検出手段と、スイッチング電源の出力を電池パックの充電時において定電流に制御する定電流制御手段と、電動工具使用時の定電圧制御と充電時の定電流制御を切り替える帰還信号切り替え手段と、電池パックの電池電圧を検出する電池電圧検出手段と、を有し、
アダプタが装着された場合には、出力電圧設定手段の複数個の設定値のうち電動工具の駆動に必要な第1の設定値を選択し、電池パックが充電可能な場合には、充電出力開閉手段を閉じて充電を開始する前に、電池電圧検出手段により電池電圧を検出し、前記選択した第1の設定値が検出した電池電圧より高い場合には電池電圧より低い値となる第2の設定値を選択し、スイッチング電源の出力電圧が電池電圧よりも低い値になってから充電電流開閉手段を閉じて充電を開始することを特徴とする充電機能付き直流電源装置。
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| JP2003199334A JP4124041B2 (ja) | 2003-07-18 | 2003-07-18 | 充電機能付き直流電源装置 |
| RU2004121210/09A RU2277279C2 (ru) | 2003-07-18 | 2004-07-13 | Источник постоянного тока с функцией зарядки аккумуляторных батарей |
| AU2004203220A AU2004203220B2 (en) | 2003-07-18 | 2004-07-16 | DC Power Source Unit with Battery Charging Function |
| DE602004010985T DE602004010985T2 (de) | 2003-07-18 | 2004-07-16 | Gleichspannungsnetzteil mit Batterieladefunktion |
| US10/892,185 US7196911B2 (en) | 2003-07-18 | 2004-07-16 | DC power source unit with battery charging function |
| EP04254274A EP1528653B1 (en) | 2003-07-18 | 2004-07-16 | DC power source with battery charging function |
| CNB200410069914XA CN100423404C (zh) | 2003-07-18 | 2004-07-19 | 具有电池充电功能的dc电源单元 |
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| JP2003199334A JP4124041B2 (ja) | 2003-07-18 | 2003-07-18 | 充電機能付き直流電源装置 |
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| EP1528653B1 (en) | 2008-01-02 |
| RU2004121210A (ru) | 2006-01-10 |
| AU2004203220B2 (en) | 2008-08-28 |
| DE602004010985T2 (de) | 2008-05-08 |
| AU2004203220A1 (en) | 2005-02-03 |
| JP2005039919A (ja) | 2005-02-10 |
| EP1528653A1 (en) | 2005-05-04 |
| CN1578055A (zh) | 2005-02-09 |
| US7196911B2 (en) | 2007-03-27 |
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