JP2010284038A - Charging device - Google Patents
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- JP2010284038A JP2010284038A JP2009136366A JP2009136366A JP2010284038A JP 2010284038 A JP2010284038 A JP 2010284038A JP 2009136366 A JP2009136366 A JP 2009136366A JP 2009136366 A JP2009136366 A JP 2009136366A JP 2010284038 A JP2010284038 A JP 2010284038A
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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
Description
本発明はバッテリを充電するための充電装置に関するものである。 The present invention relates to a charging device for charging a battery.
リチウムイオン電池などのバッテリの充電装置における充電制御として、バッテリの残存容量が少なく端子電圧が低い場合には定電流充電を行い、定電流充電されて端子電圧が所定の電圧値まで上昇すると定電圧充電に切り換える方式が知られている。この方式において、定電圧充電時は充電が進むにつれて充電装置の充電電圧とバッテリの端子電圧の電圧差が小さくなり、同時に充電電流も小さくなっていく。この特性を利用して、定電圧充電時の充電電流を測定し、所定の電流値以下となった場合にバッテリが満充電状態であると判定することが可能である。しかしながら、バッテリの充電特性としては充電開始から比較的短時間で満充電状態に近い充電電流値まで減少し、その後は長い時間をかけて満充電状態の充電電流値まで緩やかに減少していく。このように満充電付近では電流変化が小さいため、充電電流の検出によりバッテリの満充電状態を判定することは難しい。そこで、充電電流が所定の電流値以下であることを検出した時点から時間計測を開始し、充電電流が所定の電流値Ｉ以下となってから所定時間Ｔ経過した時点をバッテリの満充電状態であると判定する方法がある（特許文献１参照）。このときの電流値Ｉと時間Ｔについては、予めバッテリの充電特性に基づいて設定される。 As charging control in a battery charger such as a lithium ion battery, constant current charging is performed when the remaining capacity of the battery is low and the terminal voltage is low, and constant voltage charging is performed when the terminal voltage rises to a predetermined voltage value. A method of switching to charging is known. In this method, during constant voltage charging, as charging progresses, the voltage difference between the charging voltage of the charging device and the terminal voltage of the battery decreases, and at the same time, the charging current also decreases. Using this characteristic, the charging current at the time of constant voltage charging is measured, and it is possible to determine that the battery is in a fully charged state when it becomes equal to or less than a predetermined current value. However, the charging characteristic of the battery decreases to a charging current value close to a fully charged state in a relatively short time from the start of charging, and then gradually decreases to a charging current value in a fully charged state over a long time. As described above, since the current change is small near the full charge, it is difficult to determine the full charge state of the battery by detecting the charge current. Therefore, time measurement is started from the time when it is detected that the charging current is equal to or less than the predetermined current value, and the time when the predetermined time T has elapsed since the charging current becomes equal to or less than the predetermined current value I is set to the fully charged state of the battery. There is a method of determining that there is (see Patent Document 1). The current value I and time T at this time are set in advance based on the charging characteristics of the battery.
しかしながら、上述の充電方法では、満充電状態、または、満充電に近い状態であるバッテリを充電装置に装着する場合、充電開始直後に充電電流が所定の電流値以下であることを検出し、その時点から所定時間経過した後に満充電と判定される。つまり、本来であれば、所定時間を経過する前に満充電状態になっているにもかかわらず、所定時間経過しないと満充電と判定されないため、充電時間が延長してしまう課題があった。 However, in the above charging method, when a battery that is in a fully charged state or a state that is almost fully charged is attached to the charging device, it is detected immediately after the start of charging that the charging current is below a predetermined current value, and It is determined that the battery is fully charged after a predetermined time has elapsed since the time. In other words, there is a problem that the charging time is extended because it is not determined that the battery is fully charged if the predetermined time has not passed even though the battery has been fully charged before the predetermined time has passed.
そこで、本発明の目的は、充電開始後の充電電流値の初回判定結果によって満充電状態の判定方法を切り換えることで上記課題を解決し、適切にバッテリ満充電を検知できる充電装置を提供することである。 Accordingly, an object of the present invention is to provide a charging device that solves the above problem by switching the determination method of the full charge state according to the initial determination result of the charging current value after the start of charging, and can appropriately detect the battery full charge. It is.
上述の課題を解決するため本発明の充電装置は、電源から供給される電流によってバッテリを充電する充電装置であって、バッテリに対して定電圧充電を行う場合に、充電電流を検出する電流検出手段と、電流検出手段により検出した充電電流が所定値以下となったことを判定する判定手段と、判定手段により充電電流が所定値以下になったと判定されてから所定時間を経過したことに応じて、満充電になった旨を通知する通知手段とを有し、定電圧充電開始時に判定手段により充電電流が所定値以下になったと判定された場合は、通知手段は、所定時間を経過する前に満充電になった旨を通知することを特徴とする。
上述の課題を解決するため、本発明の充電装置は、電源から供給される充電電流および充電電圧によってバッテリを充電する充電装置であって、バッテリに対して定電圧充電を行う場合に、充電電流を検出する電流検出手段と、電流検出手段により検出した充電電流が所定値以下となったことを判定する判定手段と、判定手段により充電電流が所定値以下になったと判定されてから所定時間を経過したことに応じて、充電を停止する停止手段とを有し、定電圧充電開始時に判定手段により充電電流が所定値以下になったと判定された場合は、停止手段は、所定時間を経過する前に充電を停止することを特徴とする。
In order to solve the above-described problems, a charging device according to the present invention is a charging device that charges a battery with a current supplied from a power source, and detects a charging current when performing constant voltage charging on the battery. And a determination means for determining that the charging current detected by the current detection means is equal to or less than a predetermined value, and that a predetermined time has elapsed since the determination means determined that the charging current was equal to or less than the predetermined value. And a notification means for notifying that the battery has been fully charged. When the determination means determines that the charging current has become a predetermined value or less at the start of constant voltage charging, the notification means passes a predetermined time. It is characterized by notifying that the battery is fully charged before.
In order to solve the above-described problems, a charging device according to the present invention is a charging device that charges a battery with a charging current and a charging voltage supplied from a power source. Current detecting means for detecting the charging current, determining means for determining that the charging current detected by the current detecting means has become a predetermined value or less, and a predetermined time after the determining means determines that the charging current has become the predetermined value or less. A stop means for stopping charging according to the elapse of time, and when the determination means determines that the charging current has become a predetermined value or less at the start of constant voltage charging, the stop means passes a predetermined time. Charging is stopped before.
本発明によれば充電開始後の充電電流値の初回判定結果によって満充電状態の判定方法を切り換えることで適切にバッテリ満充電検知できる充電装置を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the charging device which can detect a battery full charge appropriately can be provided by switching the determination method of a full charge state by the initial determination result of the charge current value after charge start.
図１から図３を参照して本発明の充電装置２０１について説明する。充電装置２０１は、ＡＣアダプタ等の電源装置２０２およびリチウムイオン電池等のバッテリ２０３を接続して、電源装置２０２から供給される電流によってバッテリを充電するものである。図２に本実施形態における充電装置の構成を示すブロック図を示す。 A charging device 201 of the present invention will be described with reference to FIGS. 1 to 3. The charging device 201 connects a power supply device 202 such as an AC adapter and a battery 203 such as a lithium ion battery, and charges the battery with a current supplied from the power supply device 202. FIG. 2 is a block diagram showing the configuration of the charging device in the present embodiment.
充電装置２０１に設けられた電源入力端子２０２ａ（正極側）、２０２ｂ（負極側）には電源２０２が接続され、電源２０２において商用交流電源を変圧、整流された所定の電圧の直流電源が入力端子２０２ａ、２０２ｂに供給される。また、充電装置２０１に設けられたバッテリ入力端子２０３ａ（正極側）、２０３ｂ（負極側）にはバッテリ２０３が接続され、電源２０２から供給される電流によってバッテリ２０３は充電される。充電装置２０１は充電回路２０４、電流検出回路２０５、バッテリ電圧変換回路２０６、電源電圧変換回路２０７、タイマ回路２０８、制御部２０９、充電表示部２１０によって構成されている。制御部２０９はシステム制御や演算処理を司るＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）を備え、各種入力信号を受けて充電装置の各部２０４〜２１０の制御を行うものである。充電回路２０４はＦＥＴ等のスイッチング素子を内蔵しており、制御部２０９によってスイッチング素子をＯＮすることでバッテリ２０３の充電を行い、ＯＦＦすることで充電を停止する。また、充電回路２０４では制御部２０９によって定電流充電モードと定電圧充電モードの切り換え制御が行われる。バッテリ２０３の残存容量が少なくバッテリ端子電圧が低い場合には定電流充電モードで充電を行い、定電流充電されてバッテリ端子電圧が所定の電圧値まで上昇すると、定電圧充電モードに切り換えて充電が行われる。定電圧充電モードでは充電が進むにつれて電源２０２の充電電圧とバッテリ２０３の端子電圧の電圧差が小さくなり、同時に充電電流も小さくなっていく。電流検出回路２０５は充電電流を検出し、充電電流が所定の電流値以下になった場合にバッテリ２０３が所定の充電レベルまで充電されたことを検知する信号を制御部２０９に入力する。電流検出回路２０５は電源２０２とバッテリ２０３の間に直列に接続された電流検出抵抗と、電流検出抵抗両端の電圧を増幅するアンプと、アンプから出力されるアナログ信号をデジタル信号に変換するトランジスタによって構成される。充電電流が所定の電流値以下になったことを電流検出回路２０５が検知した時点からタイマ回路２０８は予め設定された所定時間の計測を行う。タイマ回路２０８が所定時間経過したことを制御部２０９に通知すると、制御部２０９はバッテリ２０３が満充電状態になったと判断して充電動作を停止させる。電流検出回路２０５が動作する所定の電流値とタイマ回路２０８によって計測される所定の時間については予めバッテリ２０３の充電特性に基づいて設定される。バッテリ電圧変換回路２０６はバッテリ２０３の電圧レベルを制御部２０９に入力するものである。同様に電源電圧変換回路２０７は電源２０２の電圧レベル制御部２０９に入力する。バッテリ電圧変換回路２０６および電源電圧変換回路２０７は、バッテリ２０３または電源２０２の電圧レベルを制御部２０９に備えられたＡ／ＤコンバータのＩ／Ｏレベルに合せて低電圧に変換して制御部２０９に入力する。制御部２０９はＡ／Ｄコンバータによってアナログ信号である入力電圧をデジタル信号に変換することでバッテリ２０３の端子電圧および電源２０２の端子電圧を検出する。制御部２０９では入力された電源２０２の端子電圧とバッテリ２０３の端子電圧の電圧差を算出し、算出した電圧差は定電流充電モード・定電圧充電モードの切り換え制御および定電圧充電モード時のバッテリ満充電検知の際に使用される。充電表示部２１０はバッテリ２０３が充電中である旨を表示するＬＣＤ（液晶表示装置）に代表される表示装置であり、充電中は表示装置を点灯してバッテリアイコンを表示し、充電停止すると表示装置を消灯する。充電表示部２１０としてＬＥＤを使用し、点灯状態や表示色により満充電状態をユーザに通知してもよい。 A power source 202 is connected to power input terminals 202a (positive side) and 202b (negative side) provided in the charging device 201, and a DC power source having a predetermined voltage obtained by transforming and rectifying a commercial AC power source at the power source 202 is an input terminal. 202a and 202b. The battery 203 is connected to battery input terminals 203 a (positive side) and 203 b (negative side) provided in the charging device 201, and the battery 203 is charged by a current supplied from the power source 202. The charging device 201 includes a charging circuit 204, a current detection circuit 205, a battery voltage conversion circuit 206, a power supply voltage conversion circuit 207, a timer circuit 208, a control unit 209, and a charge display unit 210. The control unit 209 includes a CPU (Central Processing Unit) that controls system control and arithmetic processing, and controls various units 204 to 210 of the charging apparatus in response to various input signals. The charging circuit 204 has a built-in switching element such as an FET, and the control unit 209 turns on the switching element to charge the battery 203 and turns it off to stop charging. In the charging circuit 204, the control unit 209 performs switching control between the constant current charging mode and the constant voltage charging mode. When the remaining capacity of the battery 203 is small and the battery terminal voltage is low, charging is performed in the constant current charging mode. When the battery terminal voltage rises to a predetermined voltage value after constant current charging, the charging is performed by switching to the constant voltage charging mode. Done. In the constant voltage charging mode, as charging progresses, the voltage difference between the charging voltage of the power source 202 and the terminal voltage of the battery 203 decreases, and at the same time, the charging current also decreases. The current detection circuit 205 detects a charging current, and inputs a signal to the control unit 209 to detect that the battery 203 has been charged to a predetermined charging level when the charging current becomes a predetermined current value or less. The current detection circuit 205 includes a current detection resistor connected in series between the power source 202 and the battery 203, an amplifier that amplifies the voltage across the current detection resistor, and a transistor that converts an analog signal output from the amplifier into a digital signal. Composed. From the time when the current detection circuit 205 detects that the charging current has become a predetermined current value or less, the timer circuit 208 performs measurement for a predetermined time set in advance. When the timer circuit 208 notifies the control unit 209 that the predetermined time has elapsed, the control unit 209 determines that the battery 203 is fully charged and stops the charging operation. The predetermined current value at which the current detection circuit 205 operates and the predetermined time measured by the timer circuit 208 are set in advance based on the charging characteristics of the battery 203. The battery voltage conversion circuit 206 inputs the voltage level of the battery 203 to the control unit 209. Similarly, the power supply voltage conversion circuit 207 inputs to the voltage level control unit 209 of the power supply 202. The battery voltage conversion circuit 206 and the power supply voltage conversion circuit 207 convert the voltage level of the battery 203 or the power supply 202 into a low voltage in accordance with the I / O level of the A / D converter provided in the control unit 209, and control the control unit 209. To enter. The control unit 209 detects the terminal voltage of the battery 203 and the terminal voltage of the power source 202 by converting the input voltage, which is an analog signal, into a digital signal by the A / D converter. The control unit 209 calculates the voltage difference between the input terminal voltage of the power source 202 and the terminal voltage of the battery 203, and the calculated voltage difference is the control of switching between the constant current charging mode and the constant voltage charging mode and the battery in the constant voltage charging mode. Used when full charge is detected. The charging display unit 210 is a display device typified by an LCD (liquid crystal display device) that displays that the battery 203 is being charged. During charging, the display device is turned on to display a battery icon, and is displayed when charging is stopped. Turn off the device. You may use LED as the charge display part 210, and may notify a user of a full charge state with a lighting state or a display color.
図１は本実施形態の充電装置における処理シーケンスを示す図である。以下、図１を用いて、本実施形態における充電動作について説明する。最初に充電装置２０１に電源２０２とバッテリ２０３を接続すると、充電表示部２１０に充電中を示すバッテリアイコンが表示される（Ｓ１００）。そして、制御部２０９ではバッテリ２０３の端子電圧と電源２０２の端子電圧が検出されて、電源２０２とバッテリ２０３の電圧差が算出される（Ｓ１０１）。（Ｓ１０２）において電源・バッテリ電圧差が所定の電圧差αＶより大きい場合には、制御部２０９によって充電回路２０４が定電流充電モードに設定されて定電流充電が行われる（Ｓ１０３）。その後、制御部２０９によって一定周期で電源・バッテリ電圧差が算出され、電源・バッテリ電圧差が所定の電圧差αＶ以下になるまで定電流充電が継続される（Ｓ１０４）〜（Ｓ１０５）。（Ｓ１０２）または（Ｓ１０５）において電源・バッテリ電圧差が所定の電圧差αＶ以下になった場合は、制御部２０９によって充電回路２０４が定電圧充電モードに設定されて定電圧充電が行われる（Ｓ１０６）。定電圧充電を開始すると最初に電流検出回路２０５によって充電電流が検出される（Ｓ１０７）。そして、（Ｓ１０８）では充電電流値の初回判定行われる。現在の充電電流と所定の電流値を比較してバッテリ２０３の満充電状態判定方法が切り換えられる。（Ｓ１０８）において充電電流が所定の電流値βＡ以下である場合には、電源・バッテリ電圧差を算出し（Ｓ１０９）、電源・バッテリ電圧差が所定の電圧差γＶ以下に到達すると制御部２０９においてバッテリ２０３が満充電状態であると判定される（Ｓ１１０）。電源・バッテリ電圧差が所定の電圧差γＶ以下になるまでは制御部２０９によって一定周期で電源・バッテリ電圧差算出を実行して定電圧充電が継続される（Ｓ１０９）〜（Ｓ１１０）。一方、（Ｓ１０８）において充電電流が所定の電流値βＡより大きい場合には、定電圧充電が継続される。そして、充電電流が所定の電流値βＡ以下になるまで制御部２０９によって一定周期で充電電流検出し充電電流と所定の電流値βＡとの比較が繰り返し行われる（Ｓ１１１）〜（Ｓ１１２）。充電電流が所定の電流値βＡ以下に到達するとタイマ回路２０８が時間計測を開始する（Ｓ１１３）。タイマ回路２０８が所定時間経過したことを計測すると制御部２０９においてバッテリ２０３が満充電状態であると判定される（Ｓ１１４）。（Ｓ１１０）または（Ｓ１１４）においてバッテリ２０３が満充電状態であると判定されると、充電表示部２１０の充電中を示すバッテリアイコンの表示を解除し、満充電になった旨を通知する（Ｓ１１５）。そして、制御部２０９が充電回路２０４を制御して充電動作を停止させる（Ｓ１１６）。ここで、充電表示停止と充電停止は必ずしも連続して行われる必要はなく、充電表示停止後しばらくの期間は充電動作を継続してその後停止する構成としても良い。 FIG. 1 is a diagram showing a processing sequence in the charging device of the present embodiment. Hereinafter, the charging operation in the present embodiment will be described with reference to FIG. When the power source 202 and the battery 203 are first connected to the charging device 201, a battery icon indicating that charging is in progress is displayed on the charging display unit 210 (S100). Then, the control unit 209 detects the terminal voltage of the battery 203 and the terminal voltage of the power source 202, and calculates the voltage difference between the power source 202 and the battery 203 (S101). When the power source / battery voltage difference is larger than the predetermined voltage difference αV in (S102), the charging circuit 204 is set to the constant current charging mode by the control unit 209 and constant current charging is performed (S103). Thereafter, the control unit 209 calculates the power source / battery voltage difference at a constant cycle, and the constant current charging is continued until the power source / battery voltage difference becomes equal to or less than the predetermined voltage difference αV (S104) to (S105). When the power source / battery voltage difference becomes equal to or smaller than the predetermined voltage difference αV in (S102) or (S105), the control unit 209 sets the charging circuit 204 to the constant voltage charging mode and performs constant voltage charging (S106). ). When constant voltage charging is started, a charging current is first detected by the current detection circuit 205 (S107). In (S108), the initial determination of the charging current value is performed. The current charging current is compared with a predetermined current value, and the method for determining the full charge state of the battery 203 is switched. When the charging current is equal to or smaller than the predetermined current value βA in (S108), the power source / battery voltage difference is calculated (S109). When the power source / battery voltage difference reaches the predetermined voltage difference γV or less, the control unit 209 It is determined that the battery 203 is fully charged (S110). Until the power source / battery voltage difference becomes equal to or less than the predetermined voltage difference γV, the control unit 209 executes the power source / battery voltage difference calculation at a constant period and the constant voltage charging is continued (S109) to (S110). On the other hand, when the charging current is larger than the predetermined current value βA in (S108), constant voltage charging is continued. Then, the control unit 209 detects the charging current at a constant period until the charging current becomes equal to or lower than the predetermined current value βA, and the comparison between the charging current and the predetermined current value βA is repeatedly performed (S111) to (S112). When the charging current reaches a predetermined current value βA or less, the timer circuit 208 starts measuring time (S113). When the timer circuit 208 measures that a predetermined time has elapsed, the control unit 209 determines that the battery 203 is fully charged (S114). If it is determined in (S110) or (S114) that the battery 203 is fully charged, the display of the battery icon indicating that the charging display unit 210 is being charged is canceled and a notification that the battery is fully charged is given (S115). ). Then, the control unit 209 controls the charging circuit 204 to stop the charging operation (S116). Here, the charging display stop and the charging stop are not necessarily performed continuously, and the charging operation may be continued for a while after the charging display is stopped and then stopped.
本実施形態の充電装置では、定電流充電中にバッテリ電圧が所定値以上になった場合に定電圧充電に切り換え、定電圧充電中の充電電流を元に充電完了のため判定を行っている。これは、満充電状態付近では、充電によるバッテリ電圧の変動が小さいので満充電となるバッテリ電圧達したのを検出するのが難しい。さらに、電圧値はブレが大きく測定が難しい。そのため、定電流充電の後に定電圧充電を行い、比較的安定している電流値を用いて充電完了のための判定を行っている。 In the charging device according to the present embodiment, when the battery voltage becomes equal to or higher than a predetermined value during constant current charging, switching to constant voltage charging is performed, and determination is made for completion of charging based on the charging current during constant voltage charging. This is because it is difficult to detect that the battery voltage has reached full charge in the vicinity of the fully charged state because the battery voltage fluctuation due to charging is small. Furthermore, the voltage value is very unstable and difficult to measure. For this reason, constant voltage charging is performed after constant current charging, and determination for completion of charging is performed using a relatively stable current value.
図３は横軸に充電時間、縦軸に電源・バッテリ電圧差をとったバッテリ充電特性を示すグラフである。図３から分かるように電源・バッテリ電圧差は充電開始から比較的短時間で満充電状態に近い充電電流値まで減少し、その後は長い時間をかけて満充電状態の充電電流値まで緩やかに減少していく。ポイントＡは充電電流が所定の電流値βＡとなる地点、ポイントＢは電源・バッテリ電圧差がγＶとなる地点、ポイントＣはポイントＡからタイマ回路２０８の時間計測により所定時間経過した地点を示している。 FIG. 3 is a graph showing battery charge characteristics with the horizontal axis representing the charging time and the vertical axis representing the power supply / battery voltage difference. As can be seen from FIG. 3, the power source / battery voltage difference decreases to a charging current value close to a fully charged state in a relatively short time after the start of charging, and then gradually decreases to a charging current value in a fully charged state over a long period of time. I will do it. Point A is a point where the charging current becomes a predetermined current value βA, Point B is a point where the power source / battery voltage difference is γV, and Point C is a point where a predetermined time has elapsed from the point A by the time measurement of the timer circuit 208 Yes.
ここでバッテリ２０３の充電状態を図３に示すＤ、Ｅ、Ｆ、Ｇの４つのパターンに分けて満充電状態の判定方法について説明する。 Here, the charging state of the battery 203 is divided into four patterns D, E, F, and G shown in FIG.
従来技術では充電電流が所定の電流値以下であることを検出して所定時間経過後にバッテリが満充電状態であると判定していた。この場合、残存容量が少ないバッテリ（Ｄ）を充電装置２０１に装着すると、充電が開始されてポイントＡにおいて充電電流が所定の電流値βＡとなったことが検出される。そして、タイマ回路２０８により所定時間経過が計測されてポイントＣにおいて満充電状態であると判定される。一方、満充電状態、であるバッテリ（Ｇ）を充電装置２０１に装着した場合、充電開始直後に充電電流が所定の電流値以下であることを検出し、その時点から所定時間経過するまで満充電判定が行われず充電時間が延長してしまうという課題がある。また、満充電状態に近いバッテリ（Ｅ、Ｆ）を充電装置２０１に装着した場合においても、その時点から所定時間経過するまで満充電判定が行われない。つまり、ポイントＣで満充電判定は行われずに充電が継続されてしまう。 In the prior art, it is determined that the battery is fully charged after a lapse of a predetermined time by detecting that the charging current is equal to or less than a predetermined current value. In this case, when a battery (D) having a small remaining capacity is attached to the charging device 201, it is detected that charging has started and the charging current has reached a predetermined current value βA at point A. Then, the elapse of a predetermined time is measured by the timer circuit 208 and it is determined that the battery is fully charged at point C. On the other hand, when the battery (G) that is in a fully charged state is attached to the charging device 201, it is detected immediately after the start of charging that the charging current is equal to or less than a predetermined current value, and the battery is fully charged until a predetermined time elapses from that point. There is a problem that the determination is not performed and the charging time is extended. Further, even when a battery (E, F) close to a fully charged state is attached to the charging device 201, the full charge determination is not performed until a predetermined time has elapsed from that point. In other words, full charge determination is not performed at point C, and charging is continued.
これに対して本発明を適用すると、以下のようになる。残存容量が少ないバッテリ（Ｄ）を充電装置２０１に装着すると、充電が進みポイントＡにおいて充電電流が所定の電流値βＡとなったことが検出される。そして、タイマ回路２０８により所定時間経過が計測されるまで充電が進み、ポイントＣにおいて満充電状態であると判定される。次に満充電状態に近いバッテリ（Ｅ）を充電すると、充電開始後の充電電流値の初回判定において所定の電流値βＡ以下であることが検出されるので、充電が進みポイントＢにおいて電源・バッテリ電圧差がγＶとなった時点で満充電状態であると判定される。また、バッテリ（Ｆ、Ｇ）については、充電開始後の充電電流値の初回判定において所定の電流値βＡ以下であることが検出され、さらに電源・バッテリ電圧差がγＶ以下であることが検出されるので充電開始後すぐに満充電状態であると判定される。 On the other hand, when the present invention is applied, it becomes as follows. When a battery (D) with a small remaining capacity is attached to the charging device 201, it is detected that charging has progressed and the charging current has reached a predetermined current value βA at point A. Then, charging proceeds until a predetermined time has elapsed by the timer circuit 208, and it is determined at point C that the battery is fully charged. Next, when the battery (E) close to the fully charged state is charged, it is detected that the charge current value is equal to or lower than the predetermined current value βA in the initial determination of the charge current value after the start of charging. It is determined that the battery is fully charged when the voltage difference reaches γV. In addition, for the batteries (F, G), it is detected that the charging current value after the start of charging is initially determined to be equal to or smaller than a predetermined current value βA, and further, the power source / battery voltage difference is detected to be equal to or smaller than γV. Therefore, it is determined that the battery is fully charged immediately after the start of charging.
以上のように本発明によれば充電開始後の充電電流値の初回判定結果によって満充電状態の判定方法を切り換えることで従来技術の課題を解決し、適切にバッテリ満充電検知できる充電装置を提供することができる。 As described above, the present invention solves the problems of the prior art by switching the determination method of the full charge state according to the initial determination result of the charge current value after the start of charging, and provides a charging device that can appropriately detect battery full charge can do.
以上、本発明の好ましい実施形態について説明したが、本発明はこれらの実施形態に限定されず、その要旨の範囲内で種々の変形及び変更が可能である。 As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.
本実施形態では、定電圧充電開始時に検出した充電電流がβ以下となる場合には、タイマ計測を行わずに、所定時間が経過する前に満充電の通知を行うようにした。そして、充電電圧とバッテリ電圧の電圧差がγ以下になったときに満充電を通知したが、定電圧充電開始時に充電電流がβ以下であることを検出した時点で、満充電に近い状態であるため、このタイミングで満充電を通知し、充電を停止してもよい。また、充電電圧とバッテリ電圧の電圧差がγ以下になったときに満充電を通知し、充電を停止したが、バッテリ電圧を検出し、バッテリ電圧が所定値以上になったタイミングで満充電を通知し、充電を停止してもよい。 In the present embodiment, when the charging current detected at the start of constant voltage charging is equal to or less than β, the timer is not measured and the full charge is notified before the predetermined time elapses. And when the voltage difference between the charging voltage and the battery voltage became γ or less, full charge was notified, but when it was detected that the charging current was β or less at the start of constant voltage charging, Therefore, full charging may be notified at this timing, and charging may be stopped. In addition, when the voltage difference between the charging voltage and the battery voltage becomes γ or less, full charging is notified and the charging is stopped, but the battery voltage is detected and fully charged when the battery voltage reaches a predetermined value or more. Notification may be made and charging may be stopped.
Claims (7)
バッテリに対して定電圧充電を行う場合に、充電電流を検出する電流検出手段と、
前記電流検出手段により検出した充電電流が所定値以下となったことを判定する判定手段と、
前記判定手段により充電電流が所定値以下になったと判定されてから所定時間を経過したことに応じて、満充電になった旨を通知する通知手段とを有し、
前記定電圧充電開始時に前記判定手段により充電電流が所定値以下になったと判定された場合は、前記通知手段は、前記所定時間を経過する前に満充電になった旨を通知することを特徴とする充電装置。 A charging device for charging a battery with a charging current and a charging voltage supplied from a power source,
Current detection means for detecting a charging current when performing constant voltage charging on the battery; and
Determining means for determining that the charging current detected by the current detecting means has become a predetermined value or less;
Notification means for notifying that the battery has been fully charged in response to the elapse of a predetermined time after the determination means determines that the charging current has become a predetermined value or less;
When the determination unit determines that the charging current has become a predetermined value or less at the start of the constant voltage charging, the notification unit notifies that the battery is fully charged before the predetermined time elapses. Charging device.
前記定電圧充電開始時に前記判定手段により充電電流が所定値以下になったと判定された場合、前記通知手段は、前記算出手段により算出した前記充電電圧と前記バッテリの電圧との電圧差が所定値以下になったことに応じて、満充電になった旨を通知することを特徴とすることを特徴とする請求項１に記載の充電装置。 Calculating means for calculating a voltage difference between the charging voltage and the battery voltage;
When the determination unit determines that the charging current has become a predetermined value or less at the start of the constant voltage charging, the notification unit determines that a voltage difference between the charging voltage calculated by the calculation unit and the voltage of the battery is a predetermined value. The charging device according to claim 1, wherein a notification indicating that the battery is fully charged is issued in response to the following.
前記通知手段は、前記充電中を示す表示を解除することにより、満充電になった旨を通知することを特徴とする請求項１ないし３のいずれか１項に記載の充電装置。 In response to starting charging of the battery, it has a display means for performing a display indicating that charging is in progress,
4. The charging device according to claim 1, wherein the notification unit notifies that the battery is fully charged by canceling the display indicating that the battery is being charged. 5.
バッテリに対して定電圧充電を行う場合に、充電電流を検出する電流検出手段と、
前記電流検出手段により検出した充電電流が所定値以下となったことを判定する判定手段と、
前記判定手段により充電電流が所定値以下になったと判定されてから所定時間を経過したことに応じて、充電を停止する停止手段とを有し、
前記定電圧充電開始時に前記判定手段により充電電流が所定値以下になったと判定された場合は、前記停止手段は、前記所定時間を経過する前に充電を停止することを特徴とする充電装置。 A charging device for charging a battery with a charging current and a charging voltage supplied from a power source,
Current detection means for detecting a charging current when performing constant voltage charging on the battery; and
Determining means for determining that the charging current detected by the current detecting means has become a predetermined value or less;
Stop means for stopping charging in response to elapse of a predetermined time since it was determined by the determination means that the charging current has become a predetermined value or less,
The charging device according to claim 1, wherein when the determination unit determines that the charging current has become a predetermined value or less at the start of the constant voltage charging, the stopping unit stops charging before the predetermined time elapses.
前記定電圧充電開始時に前記判定手段により充電電流が所定値以下になったと判定された場合、前記停止手段は、前記算出手段により算出した前記充電電圧と前記バッテリの電圧との電圧差が所定値以下になったことに応じて、充電を停止することを特徴とすることを特徴とする請求項１に記載の充電装置。 Calculating means for calculating a voltage difference between the charging voltage and the battery voltage;
When the determination unit determines that the charging current has become a predetermined value or less at the start of the constant voltage charging, the stop unit is configured such that a voltage difference between the charging voltage calculated by the calculation unit and the voltage of the battery is a predetermined value. The charging device according to claim 1, wherein charging is stopped according to the following.
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