JPH09233728A - Charger - Google Patents

Charger

Info

Publication number
JPH09233728A
JPH09233728A JP8039966A JP3996696A JPH09233728A JP H09233728 A JPH09233728 A JP H09233728A JP 8039966 A JP8039966 A JP 8039966A JP 3996696 A JP3996696 A JP 3996696A JP H09233728 A JPH09233728 A JP H09233728A
Authority
JP
Japan
Prior art keywords
voltage
charging
secondary battery
battery
charge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8039966A
Other languages
Japanese (ja)
Inventor
Yasunari Mizoguchi
康成 溝口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP8039966A priority Critical patent/JPH09233728A/en
Publication of JPH09233728A publication Critical patent/JPH09233728A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
    • 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

Landscapes

  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

PROBLEM TO BE SOLVED: To accurately detect the change of battery voltage without being subjected to the disturbance of noise regardless of the magnitude of a charge current by setting the time constant at the time of a voltage detecting means detecting the change of the battery voltage, according to the magnitude of a charge current. SOLUTION: A charger is equipped with a power circuit 11, a charge control switch 12, a detecting circuit 13 which detects the voltage of a secondary battery, and a charge control circuit 14. This is provided with a feedback circuit 102 which fixes the voltage and current from a step-down transformer 110, and is equipped with a switching power source 105, and a charge current changeover switch 104. A charge control circuit 14 terminates the charge by turning off the charge control switch 12 when the voltage of the secondary battery B detected by the voltage detecting circuit 13 amounts to a specified value. The charge control circuit 14 properly sets the time constant to detect the voltage change of the secondary battery B, according to the magnitude of the charge current being set by operating the charge current changeover switch 104. Hereby, even if the charge current is small, the change of the battery voltage is obtained surely without being disturbed by noise.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、二次電池の電池電
圧の変化を検出して充電制御を行う充電装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device which detects a change in battery voltage of a secondary battery and controls charging.

【０００２】[0002]

【従来の技術】充電を行うことにより繰り返し使用可能
なニッケルカドミウム電池やニッケル水素電池等の二次
電池は、ビデオカメラや携帯電話等の携帯用機器の電源
として広く使用されている。斯る二次電池は、所定の大
きさの定電流を印加して定電流充電すると、電池電圧が
徐々に上昇する。そして、満充電になると、電池電圧は
ピークに達した後、次第に降下するという充電特性を備
えている。2. Description of the Related Art Secondary batteries such as nickel-cadmium batteries and nickel-hydrogen batteries, which can be repeatedly used by charging, are widely used as a power source for portable devices such as video cameras and mobile phones. In such a secondary battery, when a constant current of a predetermined magnitude is applied to charge the battery with a constant current, the battery voltage gradually rises. When the battery is fully charged, it has a charging characteristic that the battery voltage reaches a peak and then gradually drops.

【０００３】そこで、二次電池の急速充電を行う場合、
この充電特性を利用し、電池電圧を検出してその変化を
検出し、電池電圧がピークに達した後に所定電圧だけ降
下したことを検出することによって、二次電池の満充電
を検出して充電を制御する充電制御方式、所謂−ΔＶ方
式が広く採用されている（例えば、特開昭６３−３０２
７３４号公報に詳しい）。Therefore, when the secondary battery is rapidly charged,
Using this charging characteristic, the battery voltage is detected, its change is detected, and it is detected that the battery voltage has reached a peak and then dropped by a predetermined voltage, thereby detecting the full charge of the secondary battery and charging. A charging control system for controlling the so-called so-called -ΔV system is widely adopted (for example, JP-A-63-302).
Details in Japanese Patent No. 734).

【０００４】このような充電制御方式において、二次電
池の電池電圧は、種々の雑音の影響を受け、二次電池が
未だ満充電に達していないにも係わらず、降下する場合
があり、この電圧降下を誤って検出すると、充電の早切
れが生じてしまう。そこで、通常、この雑音等に伴う電
圧降下が、二次電池の満充電後の電圧降下に比べて急峻
であることに着目し、電池電圧の変化の検出を、ある程
度の長さの時定数（即ち、雑音に伴う電圧降下を検出し
ない長さの時定数）をもって行うことにより、雑音等に
伴う電圧降下をできるだけ検出しないようにしている。In such a charge control system, the battery voltage of the secondary battery may be affected by various noises and may drop even though the secondary battery is not yet fully charged. If the voltage drop is erroneously detected, premature charge will occur. Therefore, in general, paying attention to the fact that the voltage drop due to this noise or the like is steeper than the voltage drop after the secondary battery is fully charged, the change of the battery voltage is detected by a time constant ( That is, the voltage drop caused by noise or the like is detected as little as possible by using a time constant of a length that does not detect the voltage drop caused by noise.

【０００５】[0005]

【発明が解決しようとする課題】ところで、二次電池の
電池電圧は、前述のように、充電の進行に伴って上昇す
るが、その変化率は、充電電流の大きさにほぼ比例す
る。即ち、充電電流が大きい場合には、電池電圧の変化
率も大きく、充電電流が小さい場合、電池電圧の変化率
は非常に小さい。By the way, the battery voltage of the secondary battery rises as the charging progresses as described above, but the rate of change thereof is almost proportional to the magnitude of the charging current. That is, when the charging current is large, the rate of change of the battery voltage is also large, and when the charging current is small, the rate of change of the battery voltage is very small.

【０００６】従って、前述のように設定される時定数
が、余りに短いと、小さい充電電流で充電を行っている
場合には、電池電圧の変化率（例えば、上昇率）も小さ
いために、電池電圧が上昇しているのか否かを正確に検
出することができない。一方、時定数を長くすると、大
きい充電電流による充電時、電池電圧がピークに達した
後の電圧降下を検出するまでの間に余分の充電が行われ
て、二次電池を過充電する恐れがある。Therefore, if the time constant set as described above is too short, the rate of change (for example, rate of increase) of the battery voltage is small when charging is performed with a small charging current, so the battery It is not possible to accurately detect whether or not the voltage is rising. On the other hand, if the time constant is lengthened, during charging with a large charging current, extra charging may be performed before the voltage drop is detected after the battery voltage reaches the peak, and the secondary battery may be overcharged. is there.

【０００７】そこで、本発明は、充電電流の大きさに関
係なく、また雑音等による悪影響を受けることなく、正
確に二次電池の電池電圧の変化を検出して、充電を制御
することを目的とする。Therefore, the present invention aims to accurately detect a change in the battery voltage of the secondary battery and control the charging regardless of the magnitude of the charging current and without being adversely affected by noise or the like. And

【０００８】[0008]

【課題を解決するための手段】本発明は、二次電池に充
電電流を供給する充電電流供給手段と、この充電電流供
給手段により充電されている二次電池の電池電圧を検出
する電圧検出手段と、この電圧検出手段により検出され
た電池電圧に基づいてその変化を検出し、前記二次電池
の充電を制御する充電制御手段とを備えた充電装置にお
いて、前記充電制御手段は、前記二次電池の電池電圧の
変化を検出する時定数を前記充電電流の大きさに応じて
設定することを特徴としている。SUMMARY OF THE INVENTION The present invention is a charging current supply means for supplying a charging current to a secondary battery, and a voltage detection means for detecting the battery voltage of the secondary battery charged by the charging current supply means. And a charging control unit that detects a change based on the battery voltage detected by the voltage detection unit and controls charging of the secondary battery, wherein the charging control unit is the secondary battery. The time constant for detecting the change in the battery voltage of the battery is set according to the magnitude of the charging current.

【０００９】より具体的には、前記充電制御手段は、前
記充電電流の大きさにほぼ反比例するように前記時定数
を設定したことを特徴とする。More specifically, the charging control means sets the time constant so as to be substantially inversely proportional to the magnitude of the charging current.

【００１０】[0010]

【発明の実施の形態】図１は本発明の一実施例を示すブ
ロック回路図である。この充電装置は、入力端子１から
供給される電力（例えば、ＡＣ電力）によって、出力端
子２に接続された二次電池Ｂを定電流充電する。このた
めに、充電装置は、電源回路１１と、充電制御スイッチ
１２と、二次電池Ｂの電池電圧を検出する電圧検出回路
１３と、マイクロコンピュータからなる充電制御回路１
４とを備えている。FIG. 1 is a block circuit diagram showing an embodiment of the present invention. This charging device charges the secondary battery B connected to the output terminal 2 with a constant current by the electric power (for example, AC electric power) supplied from the input terminal 1. Therefore, the charging device includes a power supply circuit 11, a charge control switch 12, a voltage detection circuit 13 for detecting the battery voltage of the secondary battery B, and a charge control circuit 1 including a microcomputer.
4 is provided.

【００１１】電源回路１１は、降圧トランス１０１と、
降圧トランス１０１より出力される電圧及び電流が夫々
一定となるように制御するフィードバック回路１０２
と、フィードバック回路１０２からのフィードバック信
号により降圧トランス１０１の１次側回路の動作制御を
行うスイッチング回路１０３と、充電電流切換えスイッ
チ１０４とを備えている。更に、電源回路１１は、充電
制御回路１４の電源としての定電圧源１０５も備えてい
る。The power supply circuit 11 includes a step-down transformer 101,
Feedback circuit 102 for controlling the voltage and current output from the step-down transformer 101 to be constant
And a switching circuit 103 for controlling the operation of the primary side circuit of the step-down transformer 101 by a feedback signal from the feedback circuit 102, and a charging current switch 104. Further, the power supply circuit 11 also includes a constant voltage source 105 as a power supply for the charge control circuit 14.

【００１２】スイッチング回路１０３は、降圧トランス
１０１より出力される充電電流が、充電電流切換えスイ
ッチ１０４にて設定された大きさとなるように、フィー
ドバック回路１０２からのフィードバック信号に応答し
て作動する。The switching circuit 103 operates in response to the feedback signal from the feedback circuit 102 so that the charging current output from the step-down transformer 101 has the magnitude set by the charging current switch 104.

【００１３】充電制御回路１４は、電圧検出回路１３に
より検出された二次電池Ｂの電池電圧に基づき、二次電
池Ｂの電池電圧が所定量低下したことを検出すると、充
電制御スイッチ１２をオフ状態として充電を終了する。When the charge control circuit 14 detects that the battery voltage of the secondary battery B has decreased by a predetermined amount based on the battery voltage of the secondary battery B detected by the voltage detection circuit 13, the charge control switch 12 is turned off. As a state, charging is completed.

【００１４】図２は充電制御回路１４の充電動作を示す
動作フローチャートである。なお、充電の開始に先だっ
て、充電電流切換えスイッチ１０４が操作され、充電電
流が所定の大きさに設定される。充電電流は、０．１Ｃ
〜１Ｃの間で適宜の大きさに設定されるが、以下の説明
では、０．３Ｃまたは１Ｃのいずれかに設定されること
としている。FIG. 2 is an operation flowchart showing the charging operation of the charging control circuit 14. Prior to the start of charging, the charging current switch 104 is operated to set the charging current to a predetermined value. Charging current is 0.1C
It is set to an appropriate size between 1C and 1C, but in the following description, it is set to either 0.3C or 1C.

【００１５】二次電池Ｂの充電は、充電制御スイッチ１
２をオン状態とすることにより開始される。二次電池Ｂ
の充電が開始されると、ステップＳ１及びＳ２におい
て、二次電池Ｂの電池電圧の検出が行われる。具体的に
は、電圧検出回路１３により１秒間に２５６回にわたっ
て検出された２５６個の電池電圧の平均値を算出するこ
とにより、１個の電池電圧のデータとする。The secondary battery B is charged by the charge control switch 1
It is started by turning 2 on. Secondary battery B
When the charging is started, the battery voltage of the secondary battery B is detected in steps S1 and S2. Specifically, the voltage detection circuit 13 calculates the average value of the 256 battery voltages detected 256 times per second to obtain one battery voltage data.

【００１６】ステップＳ３において、充電電流の大きさ
を判定する。そして、充電電流の大きさが１Ｃである場
合、処理はステップＳ４に進み、充電電流の大きさが
０．３Ｃの場合、処理はステップＳ６に進む。In step S3, the magnitude of the charging current is determined. Then, if the magnitude of the charging current is 1C, the process proceeds to step S4, and if the magnitude of the charging current is 0.3C, the process proceeds to step S6.

【００１７】ステップＳ４においては、検出された電池
電圧が８秒間連続して（即ち、８個の電池電圧データが
連続して）上昇したか否かが判定される。そして、上昇
したと判定されると、ステップＳ８におけるＵＰ処理に
おいて、検出された電池電圧の最大値が記憶保持され、
処理がステップＳ１に戻る。In step S4, it is determined whether or not the detected battery voltage continuously rises for 8 seconds (that is, eight battery voltage data continuously). When it is determined that the battery voltage has risen, the maximum value of the detected battery voltage is stored and held in the UP process in step S8,
The process returns to step S1.

【００１８】一方、ステップＳ４において上昇していな
いと判断された場合、ステップＳ５において、検出され
た電池電圧が１６秒間連続して（即ち、１６個の電池電
圧データが連続して）降下したか否かが判定される。連
続降下していないと判断された場合、処理はステップＳ
１に戻る。一方、連続降下している場合、ステップＳ９
のＤＯＷＮ処理において、連続降下した後の最低電池電
圧と、それまでの充電中における最大電池電圧とが比較
される。そして、ステップＳ１０において、その差が４
０ｍＶ以上であるか否かが判定される。４０ｍＶ以上で
ない場合、処理はステップＳ１に戻る。４０ｍＶ以上で
あると判断されると、二次電池Ｂは満充電に達したと判
断され、充電制御スイッチ１２がオフ状態となって、二
次電池Ｂの充電が終了する。On the other hand, if it is determined in step S4 that the battery voltage has not risen, then in step S5 the detected battery voltage has dropped continuously for 16 seconds (ie, 16 battery voltage data continuously). It is determined whether or not. If it is determined that the descent has not continued, the process proceeds to step S.
Return to 1. On the other hand, if it is continuously descending, step S9
In the DOWN processing of 1., the minimum battery voltage after the continuous drop is compared with the maximum battery voltage during charging until then. Then, in step S10, the difference is 4
It is determined whether it is 0 mV or higher. When it is not 40 mV or more, the process returns to step S1. If it is determined to be 40 mV or more, it is determined that the secondary battery B has reached full charge, the charge control switch 12 is turned off, and the charging of the secondary battery B is completed.

【００１９】ところで、前述のステップＳ３において、
電電流の大きさが０．３Ｃであると判断された場合、処
理はステップＳ６に進む。ステップＳ６においては、検
出された電池電圧が２４秒間連続して（即ち、２４個の
電池電圧データが連続して）上昇したか否かが判定され
る。そして、上昇したと判定されると、ステップＳ８に
おいて、検出された電池電圧の最大値が記憶保持され、
処理はステップＳ１に戻る。By the way, in step S3 described above,
When it is determined that the magnitude of the electric current is 0.3C, the process proceeds to step S6. In step S6, it is determined whether or not the detected battery voltage continuously rises for 24 seconds (that is, 24 battery voltage data continuously). When it is determined that the battery voltage has risen, the maximum value of the detected battery voltage is stored and held in step S8,
The process returns to step S1.

【００２０】一方、ステップＳ６において上昇していな
いと判断された場合、ステップＳ７において、検出され
た電池電圧が４８秒間連続して（即ち、４８個の電池電
圧データが連続して）降下したか否かが判定される。連
続降下していないと判断された場合、処理はステップＳ
１に戻る。一方、連続降下している場合、ステップＳ９
に進み、以後、前述と同様の処理が進められる。On the other hand, if it is determined in step S6 that the battery voltage has not risen, then in step S7 the detected battery voltage has dropped continuously for 48 seconds (ie, 48 battery voltage data continuously). It is determined whether or not. If it is determined that the descent has not continued, the process proceeds to step S.
Return to 1. On the other hand, if it is continuously descending, step S9
Then, the same processing as described above is performed.

【００２１】以上のように、本実施例においては、充電
電流切換えスイッチ１０４を操作して設定された充電電
流の大きさに従って、充電制御回路１４は、二次電池Ｂ
の電池電圧の変化を検出する時定数を適宜に設定する、
具体的には、充電電流にほぼ反比例するように設定する
ため、充電電流が小さく、二次電池Ｂの電池電圧の変化
率が小さい場合でも、雑音等により電池電圧の変動によ
る影響を受けることなく、確実に二次電池Ｂの電池電圧
の変化を検出することができる。As described above, in the present embodiment, the charge control circuit 14 controls the secondary battery B according to the magnitude of the charge current set by operating the charge current selector switch 104.
Set the time constant to detect the change of the battery voltage of
Specifically, since the setting is made so as to be almost inversely proportional to the charging current, even if the charging current is small and the rate of change of the battery voltage of the secondary battery B is small, it is not affected by the fluctuation of the battery voltage due to noise or the like. Therefore, the change in the battery voltage of the secondary battery B can be reliably detected.

【００２２】ところで、本実施例は、充電電流切換えス
イッチ１０４を操作することにより、任意の充電電流に
設定することができる充電装置を示しており、充電制御
回路１４は、スイッチ操作により設定された充電電流に
応じて適宜に時定数を設定するようにしているが、充電
電流が予め所定の大きさに固定設定される充電装置の場
合にあっては、充電電流を予め設定する際に、当該充電
電流の大きさに応じて、適宜の時定数を設定するように
すればよい。By the way, the present embodiment shows a charging device capable of setting an arbitrary charging current by operating the charging current changeover switch 104, and the charging control circuit 14 is set by the switch operation. Although the time constant is appropriately set according to the charging current, in the case of a charging device in which the charging current is fixedly set to a predetermined magnitude in advance, when the charging current is set in advance, An appropriate time constant may be set according to the magnitude of the charging current.

【００２３】[0023]

【発明の効果】本発明は、二次電池に充電電流を供給す
る充電電流供給手段と、この充電電流供給手段により充
電されている二次電池の電池電圧を検出する電圧検出手
段と、この電圧検出手段により検出された電池電圧に基
づいてその変化を検出し、前記二次電池の充電を制御す
る充電制御手段とを備えた充電装置において、前記充電
制御手段は、前記二次電池の電池電圧の変化を検出する
時定数を前記充電電流の大きさに応じて設定するので、
充電電流の大きさに関係なく、また雑音等による悪影響
を受けることなく、正確に二次電池の電池電圧の変化を
検出して、充電を制御することができる。The present invention provides a charging current supplying means for supplying a charging current to a secondary battery, a voltage detecting means for detecting a battery voltage of the secondary battery charged by the charging current supplying means, and this voltage. In the charging device, which includes a charge control unit that detects the change based on the battery voltage detected by the detection unit and controls the charging of the secondary battery, the charge control unit is the battery voltage of the secondary battery. Since the time constant for detecting the change of is set according to the magnitude of the charging current,
It is possible to accurately detect a change in the battery voltage of the secondary battery and control charging regardless of the magnitude of the charging current and without being adversely affected by noise or the like.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施例を示すブロック回路図であ
る。FIG. 1 is a block circuit diagram showing one embodiment of the present invention.

【図２】本発明の一実施例を示す動作フローチャート図
である。FIG. 2 is an operation flowchart showing an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

Ｂ 二次電池 １１ 電源回路 １２ 充電制御スイッチ １３ 電圧検出回路 １４ 充電制御回路 B secondary battery 11 power supply circuit 12 charge control switch 13 voltage detection circuit 14 charge control circuit

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 二次電池に充電電流を供給する充電電流
供給手段と、この充電電流供給手段により充電されてい
る二次電池の電池電圧を検出する電圧検出手段と、この
電圧検出手段により検出された電池電圧に基づいてその
変化を検出し、前記二次電池の充電を制御する充電制御
手段とを備えた充電装置において、前記充電制御手段
は、前記二次電池の電池電圧の変化を検出する時定数を
前記充電電流の大きさに応じて設定することを特徴とし
た充電装置。1. A charging current supplying means for supplying a charging current to a secondary battery, a voltage detecting means for detecting a battery voltage of a secondary battery charged by the charging current supplying means, and a detecting means for detecting the voltage by the voltage detecting means. And a charging control means for controlling the charging of the secondary battery, wherein the charging control means detects a change in the battery voltage of the secondary battery. The charging device is characterized in that a time constant to be set is set according to the magnitude of the charging current. 【請求項２】 前記充電制御手段は、前記充電電流の大
きさにほぼ反比例するように前記時定数を設定すること
を特徴とした請求項１の充電装置。2. The charging device according to claim 1, wherein the charging control means sets the time constant so as to be substantially inversely proportional to the magnitude of the charging current.
JP8039966A 1996-02-27 1996-02-27 Charger Pending JPH09233728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8039966A JPH09233728A (en) 1996-02-27 1996-02-27 Charger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8039966A JPH09233728A (en) 1996-02-27 1996-02-27 Charger

Publications (1)

Publication Number Publication Date
JPH09233728A true JPH09233728A (en) 1997-09-05

Family

ID=12567705

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8039966A Pending JPH09233728A (en) 1996-02-27 1996-02-27 Charger

Country Status (1)

Country Link
JP (1) JPH09233728A (en)

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