JP3151275B2 - Rechargeable battery charging circuit - Google Patents
Rechargeable battery charging circuitInfo
- Publication number
- JP3151275B2 JP3151275B2 JP02923792A JP2923792A JP3151275B2 JP 3151275 B2 JP3151275 B2 JP 3151275B2 JP 02923792 A JP02923792 A JP 02923792A JP 2923792 A JP2923792 A JP 2923792A JP 3151275 B2 JP3151275 B2 JP 3151275B2
- Authority
- JP
- Japan
- Prior art keywords
- charging
- output
- temperature
- battery
- circuit
- 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.)
- Expired - Fee Related
Links
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は二次電池の充電回路に係
り、特に充電時の二次電池の温度を検出して充電を制御
する充電回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging circuit for a secondary battery, and more particularly to a charging circuit for controlling charging by detecting the temperature of the secondary battery during charging.
【０００２】[0002]
【従来の技術】二次電池を充電する方式は種々提案され
ているが、特に二次電池の温度変化を検出して充電を制
御する方式としては、例えば特開昭５０−４４４３２号
公報に記載された充電回路がある。この充電回路におい
ては、二次電池の温度が所定範囲内にあり、かつ温度変
化率が所定値以下のとき、急速充電電流を供給するよう
にしている。2. Description of the Related Art Various systems for charging a secondary battery have been proposed. Particularly, a system for controlling charging by detecting a change in temperature of the secondary battery is described in, for example, JP-A-50-44432. There is a charging circuit. In this charging circuit, when the temperature of the secondary battery is within a predetermined range and the temperature change rate is equal to or lower than a predetermined value, a rapid charging current is supplied.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の充電回
路においては、例えばニッケル水素電池のように充電初
期や中期でも微小の発熱をするような二次電池を周囲温
度が高い状態で充電すると、充電末期に達する以前に電
池の温度が所定値を越えてしまい、著しい充電不足とな
ることがある。In the above-described conventional charging circuit, when a secondary battery, such as a nickel-metal hydride battery, which generates a small amount of heat even in the initial and middle stages of charging, is charged at a high ambient temperature, Before reaching the end of charging, the temperature of the battery may exceed a predetermined value, resulting in a significant shortage of charging.
【０００４】本発明は、このような問題点を解消するた
めになされたもので、周囲温度が高い場合でも充電不足
がなく、常に短時間でほぼ１００％の充電ができる二次
電池の充電回路を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and there is no charge shortage even when the ambient temperature is high, and a charging circuit for a secondary battery capable of always charging almost 100% in a short time. The purpose is to provide.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
め、本発明に係る二次電池の充電回路は以下の（ａ）〜
（ｆ）により構成される。 （ａ）二次電池を充電するためのＩ１≧Ｉ２≧Ｉ３の関
係を有するＩ１，Ｉ２およびＩ３なる電流をそれぞれ出
力する第１、第２および第３の充電用電源、二次電池を
充電するためのＩ１≧Ｉ２≧Ｉ３の関係を有するＩ１，
Ｉ２およびＩ３なる電流をそれぞれ出力する第１、第２
および第３の充電用電源と、 （ｂ）前記二次電池に対し第１の充電期間に第１の充電
用電源、第２の充電期間に第２の充電用電源、第３の充
電期間に第３の充電用電源をそれぞれ接続する切替手
段、 （ｃ）前記二次電池の温度がＴ１≦Ｔ２≦Ｔ３の関係を
有するＴ１，Ｔ２およびＴ３なる第１、第２および第３
の設定温度にそれぞれ達したことを検出して検出出力を
発生する第１、第２および第３の温度検出手段と、 （ｄ）前記二次電池の時間に対する温度変化率を検出す
る温度変化率検出手段と、前記二次電池の充電中の前記
温度変化率検出手段の出力値と設定値とを比較して、出
力値が設定値に達したとき反転出力を発生する比較手段
と、第１、第２および第３の充電期間のそれぞれの開始
と同時に起動される第１、第２および第３のタイマー、 （ｅ）第１の充電期間中に前記比較手段の反転出力、前
記第１の温度検出手段の検出出力および前記第１のタイ
マーの限時出力のいずれかが発生したとき第２の充電期
間に移行し、第２の充電期間中に前記比較手段の反転出
力、前記第２の温度検出手段の検出出力および前記第２
のタイマーの限時出力のいずれかが発生したとき第３の
充電期間に移行し、第３の充電期間中に前記第３の温度
検出手段の検出出力および前記第３のタイマーの限時出
力のいずれかが発生したとき第３の充電期間を終了する
ように前記切替手段を制御する制御手段、 （ｆ）第１および第２の充電期間のそれぞれの開始から
所定時間の間は前記比較手段の反転出力の発生による前
記制御手段の制御動作を禁止する手段。なお、第３の設
定温度Ｔ３は第１および第２の設定温度Ｔ１，Ｔ２に対
して、Ｔ３＝２×Ｔ２−Ｔ１の関係に設定されることが
好ましい。In order to solve the above-mentioned problems, a charging circuit for a secondary battery according to the present invention comprises the following (a) to (d).
(F). (A) The relation of I1 ≧ I2 ≧ I3 for charging the secondary battery
First, second and third charging power supply, I1 having a relationship of I1 ≧ I2 ≧ I3 for charging the secondary battery to output I1 having engagement, I2 and I3 become current, respectively,
First and second output currents I2 and I3, respectively.
And a third charging power source; (b) a first charging power source during the first charging period, a second charging power source during the second charging period, and a third charging power source with respect to the secondary battery. Switching means for respectively connecting a third charging power supply; (c) the temperature of the secondary battery satisfies the relationship of T1 ≦ T2 ≦ T3
T1, T2 and T3 having first, second and third
First, second and third temperature sensing means, temperature variation for detecting the temperature change rate with respect to (d) time of the secondary battery for generating a detection output by detecting that reaches each set temperature of the Rate detecting means, comparing the output value of the temperature change rate detecting means during charging of the secondary battery with a set value, and generating an inverted output when the output value reaches the set value; A first, a second and a third timer which are started simultaneously with the start of each of the first, second and third charging periods; (e) an inverted output of the comparing means during the first charging period; When one of the detection output of the temperature detecting means and the timed output of the first timer is generated, the process proceeds to the second charging period, and the inverted output of the comparing means and the second output during the second charging period. The detection output of the temperature detection means and the second
When one of the timed outputs of the timer is generated, the process proceeds to the third charging period, and during the third charging period, any one of the detection output of the third temperature detecting means and the timed output of the third timer is performed. Control means for controlling the switching means so as to end the third charging period when the occurrence of the error occurs. (F) Inverting output of the comparing means during a predetermined time from the start of each of the first and second charging periods. Means for inhibiting the control operation of the control means due to the occurrence of Preferably, the third set temperature T3 is set to have a relationship of T3 = 2 × T2-T1 with respect to the first and second set temperatures T1 and T2.
【０００６】また、制御手段の制御動作を禁止する上記
（ｆ）の手段においては、第１の充電期間の開始からの
制御動作禁止時間Ｔａと、第２の充電期間の開始からの
制御動作禁止時間Ｔｂとの関係がＴａ≦Ｔｂであること
が望ましい。In the means (f) for prohibiting the control operation of the control means, the control operation prohibition time Ta from the start of the first charging period and the control operation prohibition time from the start of the second charging period are prohibited. It is desirable that the relationship with the time Tb is Ta ≦ Tb.
【０００７】[0007]
【作用】二次電池、例えばニッケル水素蓄電池では、充
電初期や中期でも多少発熱して温度が上昇し、充電末期
になると電池内部からの発熱が急激に多くなり、発熱と
放熱がバランスするまで表面温度が上昇する。充電電流
が大きくなるほど、充電末期はもちろん充電初期や中期
での温度上昇率も大きくなり、特に温度の高い状態で急
速充電した場合、電池温度は異常に高くなる。[Function] In a secondary battery, for example, a nickel-metal hydride storage battery, the temperature rises due to a small amount of heat even in the initial and middle stages of charging. The temperature rises. As the charging current increases, the rate of temperature rise at the end of charging, as well as at the beginning and middle of charging, also increases. Particularly when the battery is rapidly charged at a high temperature, the battery temperature becomes abnormally high.
【０００８】また、電池内部で発生する熱が電池表面ま
で伝わるのに時間的遅れがあり、さらに電池温度を検知
するためのサーミスタ等の温度センサにも応答に時間遅
れがあるために、充電電流が大きくなるほど急速充電を
停止させる設定温度を低くする必要がある。そのため周
囲温度が高いと、前述のように充電不足となることがあ
る。Also, there is a time delay in transferring heat generated inside the battery to the surface of the battery, and there is also a time delay in response to a temperature sensor such as a thermistor for detecting the battery temperature. It is necessary to lower the set temperature at which the rapid charging is stopped as the value becomes larger. Therefore, when the ambient temperature is high, charging may be insufficient as described above.
【０００９】本発明では第１、第２および第３の３段階
の充電期間が設定され、それぞれの充電電流Ｉ１、Ｉ２
およびＩ３はＩ１≧Ｉ２≧Ｉ３のように、第１、第２お
よび第３の充電期間の順に小さく設定される。そして、
充電制御は次のようにして行われる。In the present invention, first, second and third charging periods are set, and respective charging currents I1 and I2 are set.
And I3 are set to be smaller in the order of the first, second and third charging periods, such as I1 ≧ I2 ≧ I3. And
The charging control is performed as follows.
【００１０】すなわち、第１および第２の充電期間では
電池の温度変化率が設定値に達するか、電池の温度が設
定温度Ｔ１，Ｔ２に達するか、または充電時間が設定値
に達するかのいずれかの条件が満たされたとき次の段階
の充電期間に移行する。第３の充電期間では電池の温度
が設定温度Ｔ３に達するか、または充電時間が所定値に
達するかのいずれかの条件か満たされたときに充電が終
了する。That is, during the first and second charging periods, the temperature change rate of the battery reaches the set value, the battery temperature reaches the set temperatures T1 and T2, or the charging time reaches the set value. When such a condition is satisfied, the process proceeds to the next charging period. In the third charging period, the charging ends when the condition that the temperature of the battery reaches the set temperature T3 or the charging time reaches a predetermined value is satisfied.
【００１１】このような充電制御を行うことにより、例
えば周囲温度が高い状態で電流Ｉ１により急速充電した
場合のように、電池温度が短時間で第１の設定温度Ｔ１
に達した場合でも、これより高い第２の設定温度Ｔ２に
電池温度が達するか、または電池の温度変化率が設定値
に達するか、あるいは第２のタイマーの限時時間に達す
るまで急速充電時より少ない電流Ｉ２で補充電が行われ
る。さらに、補充電の後は、電池温度が第３の設定温度
Ｔ３に達するか、あるいは第３のタイマーの限時時間に
達するまで補充電時よりさらに少ない電流Ｉ３でトリク
ル充電が行われる。従って、周囲温度が高い場合でも充
電不足になることがなく、短時間でほぼ１００％の充電
が行われる。By performing such charge control, the battery temperature can be reduced to the first set temperature T1 in a short time, for example, when the battery is rapidly charged by the current I1 in a state where the ambient temperature is high.
Is reached, the battery temperature reaches a higher second set temperature T2, or the temperature change rate of the battery reaches the set value, or until the time limit of the second timer is reached. The supplementary charging is performed with a small current I2. Further, after the supplementary charge, the trickle charge is performed with a smaller current I3 than during the supplementary charge until the battery temperature reaches the third set temperature T3 or reaches the time limit of the third timer. Therefore, even when the ambient temperature is high, there is no shortage of charging, and almost 100% charging is performed in a short time.
【００１２】さらに、第１および第２充電期間では電池
の温度変化率、電池の温度および充電時間に基づく３重
の充電制御を行い、第３の充電期間では電池の温度およ
び充電時間に基づく２重の充電制御を行うため、安全性
が向上する。Further, in the first and second charging periods, triple charging control based on the temperature change rate of the battery, the temperature of the battery and the charging time is performed, and in the third charging period, the control based on the temperature and the charging time of the battery is performed. Since heavy charge control is performed, safety is improved.
【００１３】[0013]
【実施例】以下、本発明の実施例を図面を参照して説明
する。図１は、本発明の一実施例に係る二次電池の充電
回路のブロック図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a charging circuit for a secondary battery according to one embodiment of the present invention.
【００１４】図１において、二次電池（以下、単に電池
という）１は例えばニッケル水素電池であり、三つのス
イッチＳＷ１，ＳＷ２，ＳＷ３からなる切替回路２を介
して第１、第２および第３の充電用電源３，４，５に選
択的に接続される。スイッチＳＷ１，ＳＷ２，ＳＷ３に
は、トランジスタ、サイリスタまたはリレー等が使用さ
れる。第１の充電用電源３は急速充電用、第２の充電用
電源４は補充電用、また第３の充電用電源５はトリクル
充電用であり、いずれも交流電源の出力を整流して直流
出力を得るか、または他の比較的大容量の電池が使用さ
れる。In FIG. 1, a secondary battery (hereinafter simply referred to as a battery) 1 is, for example, a nickel-metal hydride battery, and a first, second and third battery is switched via a switching circuit 2 comprising three switches SW1, SW2 and SW3. Are selectively connected to the charging power supplies 3, 4, and 5. A transistor, a thyristor, a relay, or the like is used for the switches SW1, SW2, and SW3. The first charging power supply 3 is for quick charging, the second charging power supply 4 is for auxiliary charging, and the third charging power supply 5 is for trickle charging. Either gain power or use other relatively high capacity batteries.
【００１５】ここで、第１、第２のおよび第３の充電用
電源３，４，５の出力電流をそれぞれＩ１，Ｉ２，Ｉ３
とすると、これらはＩ１≧Ｉ２≧Ｉ３なる関係に設定さ
れている。Here, the output currents of the first, second, and third charging power sources 3, 4, and 5 are represented by I1, I2, and I3, respectively.
Then, these are set in a relationship of I1 ≧ I2 ≧ I3.
【００１６】温度センサ６は電池１に内蔵されるか、ま
たは電池１に近接して設置されて電池１の温度に対応し
た出力を得る素子であり、例えばサーミスタが使用され
る。温度センサ６の出力信号は、温度変換回路７に入力
される。温度変換回路７は、例えば温度センサ６の出力
を温度変化に対してほぼ直線的に変化する電圧値Ｖｔに
変換して出力する回路である。以下は、温度変化に対す
る電圧値Ｖｔの変化の直線の傾きが負の場合について説
明する。The temperature sensor 6 is an element which is built in the battery 1 or is installed close to the battery 1 to obtain an output corresponding to the temperature of the battery 1, and uses, for example, a thermistor. The output signal of the temperature sensor 6 is input to the temperature conversion circuit 7. The temperature conversion circuit 7 is, for example, a circuit that converts the output of the temperature sensor 6 into a voltage value Vt that changes almost linearly with a change in temperature and outputs the voltage value Vt. Hereinafter, a case where the slope of the straight line of the change in the voltage value Vt with respect to the temperature change is negative will be described.
【００１７】温度変換回路７の出力端子は、温度変化率
検出回路８の入力端子に接続されている。温度変化率検
出回路８は電池１の温度変化率を検出する回路であり、
例えば微分回路によって構成され、電池１の温度変化に
対応した電圧値の出力Ｖｔ′を発生する。以下、温度変
化率検出回路８を構成する微分回路の利得を負として説
明する。An output terminal of the temperature conversion circuit 7 is connected to an input terminal of the temperature change rate detection circuit 8. The temperature change rate detection circuit 8 is a circuit for detecting the temperature change rate of the battery 1;
For example, it is constituted by a differentiating circuit, and generates an output Vt ′ having a voltage value corresponding to a temperature change of the battery 1. Hereinafter, the description will be made assuming that the gain of the differentiating circuit constituting the temperature change rate detecting circuit 8 is negative.
【００１８】温度変化率検出回路８の出力端子は、比較
手段である電圧比較器９の反転入力端子に接続される。
電圧比較器９の非反転入力端子には、設定値Ｖｋ０が入
力されている。電圧比較器９は、温度変化率検出回路８
の出力Ｖｔ′が設定値Ｖｋ０に達すると、出力が高レベ
ルから低レベルに反転して、電池１の温度上昇率が設定
値Ｖｋ０に相当する温度上昇率に達したことを示す反転
出力を発生する。この電圧比較器９の出力は、ＮＯＲ回
路１３の一方の入力端子を介して充電制御回路１４の入
力端子ａに入力される。An output terminal of the temperature change rate detecting circuit 8 is connected to an inverting input terminal of a voltage comparator 9 which is a comparing means.
The set value Vk0 is input to the non-inverting input terminal of the voltage comparator 9. The voltage comparator 9 includes a temperature change rate detection circuit 8
When the output Vt 'reaches the set value Vk0, the output is inverted from the high level to the low level to generate an inverted output indicating that the temperature rise rate of the battery 1 has reached the temperature rise rate corresponding to the set value Vk0. I do. The output of the voltage comparator 9 is input to the input terminal a of the charge control circuit 14 via one input terminal of the NOR circuit 13.
【００１９】温度変換回路７の出力端子は、３つの電圧
比較器１０，１１，１２の反転入力端子にも接続されて
いる。電圧比較器１０，１１，１２の非反転入力端子に
は、基準電圧Ｖｋ１，Ｖｋ２，Ｖｋ３がそれぞれ印加さ
れている。The output terminal of the temperature conversion circuit 7 is also connected to the inverting input terminals of the three voltage comparators 10, 11, and 12. Reference voltages Vk1, Vk2, and Vk3 are applied to non-inverting input terminals of the voltage comparators 10, 11, and 12, respectively.
【００２０】電圧比較器１０は温度センサ６および温度
変換回路７と共に第１の温度検出手段を構成し、温度セ
ンサ６の検出温度が上昇し温度変換回路７の出力Ｖｔが
低下して基準電圧Ｖｋ１に達すると、電圧比較器１０の
出力が低レベルから高レベルに反転することによって、
電池１の温度が基準電圧Ｖｋ１に相当する第１の設定温
度Ｔ１に達したことを示す検出出力を発生する。The voltage comparator 10 constitutes first temperature detecting means together with the temperature sensor 6 and the temperature conversion circuit 7. The temperature detected by the temperature sensor 6 increases, the output Vt of the temperature conversion circuit 7 decreases, and the reference voltage Vk1 , The output of the voltage comparator 10 is inverted from a low level to a high level,
A detection output indicating that the temperature of the battery 1 has reached a first set temperature T1 corresponding to the reference voltage Vk1 is generated.
【００２１】電圧比較器１１は温度センサ６および温度
変換回路７と共に第２の温度検出手段を構成し、温度セ
ンサ６の検出温度が上昇し温度変換回路７の出力Ｖｔが
低下して基準電圧Ｖｋ２に達すると、電圧比較器１１の
出力が低レベルから高レベルに反転することによって、
電池１の温度が基準電圧Ｖｋ２に相当する第２の設定温
度Ｔ２に達したことを示す検出出力を発生する。The voltage comparator 11 constitutes second temperature detecting means together with the temperature sensor 6 and the temperature conversion circuit 7. The temperature detected by the temperature sensor 6 rises, the output Vt of the temperature conversion circuit 7 drops, and the reference voltage Vk2 , The output of the voltage comparator 11 is inverted from a low level to a high level,
A detection output indicating that the temperature of the battery 1 has reached the second set temperature T2 corresponding to the reference voltage Vk2 is generated.
【００２２】電圧比較器１２は温度センサ６および温度
変換回路７と共に第３の温度検出手段を構成し、温度セ
ンサ６の検出温度が上昇し温度変換回路７の出力Ｖｔが
低下して基準電圧Ｖｋ３に達すると、電圧比較器１２の
出力が低レベルから高レベルに反転することによって、
電池１の温度が基準電圧Ｖｋ３に相当する第３の設定温
度Ｔ３に達したことを示す検出出力を発生する。The voltage comparator 12 constitutes third temperature detecting means together with the temperature sensor 6 and the temperature conversion circuit 7. The temperature detected by the temperature sensor 6 increases, the output Vt of the temperature conversion circuit 7 decreases, and the reference voltage Vk3 Is reached, the output of the voltage comparator 12 is inverted from a low level to a high level,
A detection output indicating that the temperature of the battery 1 has reached a third set temperature T3 corresponding to the reference voltage Vk3 is generated.
【００２３】ここで、第１、第２および第３の設定温度
Ｔ１，Ｔ２，Ｔ３は、Ｔ１≦Ｔ２≦Ｔ３の関係に設定さ
れ、従って３つの基準電圧の大小関係は、Ｖｋ１≧Ｖｋ
２≧Ｖｋ３に設定されている。電圧比較器１０，１１，
１２の出力は、充電制御回路１４の入力端子ｂ，ｃ，ｄ
にそれぞれ入力される。Here, the first, second, and third set temperatures T1, T2, and T3 are set in a relationship of T1 ≦ T2 ≦ T3. Therefore, the magnitude relationship of the three reference voltages is Vk1 ≧ Vk
2 ≧ Vk3 is set. Voltage comparators 10, 11,
12 are input terminals b, c, d of the charge control circuit 14.
Respectively.
【００２４】充電制御回路１４の出力端子ｇ，ｈ，ｉ
は、切替回路２内のスイッチＳＷ１，ＳＷ２，ＳＷ３の
制御端子にそれぞれ接続されるとともに、第１、第２お
よび第３のタイマー１７，１８，１９の入力端子にもそ
れぞれ接続されている。タイマー１７，１８，１９の出
力端子は、充電制御回路１４の入力端子ｊ，ｋ，ｌにそ
れぞれ接続されている。Output terminals g, h, i of the charge control circuit 14
Are connected to the control terminals of the switches SW1, SW2, and SW3 in the switching circuit 2, respectively, and are also connected to the input terminals of the first, second, and third timers 17, 18, and 19, respectively. Output terminals of the timers 17, 18, and 19 are connected to input terminals j, k, and l of the charge control circuit 14, respectively.
【００２５】本実施例の充電回路の動作をスタートさせ
るためのスタートパルスは、充電制御回路１４の入力端
子ｆとＯＲ回路１５の一方の入力端子を介して第４のタ
イマー１６に入力され、第４のタイマー１６の出力はＮ
ＯＲ回路１３の他方の入力端子に入力され、ＯＲ回路１
５の他方の入力端子は充電制御回路１４の出力端子ｈに
接続されている。これらＮＯＲ回路１３、ＯＲ回路１５
および第４のタイマー１６は、第１および第２の充電期
間のそれぞれれの開始から所定時間の間は、電圧比較器
９からの反転出力による充電制御回路１４の制御動作を
禁止するために設けられている。A start pulse for starting the operation of the charging circuit of the present embodiment is input to the fourth timer 16 via the input terminal f of the charging control circuit 14 and one input terminal of the OR circuit 15, and The output of the timer 16 of No. 4 is N
The input to the other input terminal of the OR circuit 13 and the OR circuit 1
5, the other input terminal is connected to the output terminal h of the charge control circuit 14. These NOR circuit 13 and OR circuit 15
And a fourth timer 16 is provided for prohibiting the control operation of the charge control circuit 14 by the inverted output from the voltage comparator 9 for a predetermined time from the start of each of the first and second charging periods. Have been.
【００２６】次に、図１の実施例の充電回路の動作を図
２の波形図を参照して説明する。図２において（ａ）は
充電電流の変化、（ｂ）は電池１の温度変化、（ｃ）は
第４のタイマー１６の出力を示している。Next, the operation of the charging circuit of the embodiment of FIG. 1 will be described with reference to the waveform diagram of FIG. 2A shows a change in the charging current, FIG. 2B shows a change in the temperature of the battery 1, and FIG. 2C shows an output of the fourth timer 16.
【００２７】＜第１の充電期間＞充電回路の電源投入時
またはスイッチ操作等に連動して発生するスタートパル
スが充電制御回路１４の入力端子ｆに印加されると、制
御回路１４の出力端子ｇから出力信号が発生される。こ
れにより切替回路２のスイッチＳＷ１がオン状態となっ
て第１の充電期間が開始し、電池１は第１の充電用電源
３から電流Ｉ１で急速充電され始める。また、これと同
時に第１のタイマー１７が起動される。<First Charging Period> When a start pulse generated upon power-on of the charging circuit or in response to a switch operation is applied to the input terminal f of the charging control circuit 14, the output terminal g of the control circuit 14 Generates an output signal. As a result, the switch SW1 of the switching circuit 2 is turned on to start the first charging period, and the battery 1 is rapidly charged from the first charging power supply 3 with the current I1. At the same time, the first timer 17 is started.
【００２８】ここで、第１の充電期間が進み、やがて充
電末期に近付くと、図２（ｂ）に示すように電池１の温
度が急激に上昇し始める。電池１の温度は、温度センサ
６により電気信号に変換され、さらに温度変換回路７に
より温度にほぼ反比例した電圧値の出力Ｖｔに変換され
る。この温度変換回路７の出力Ｖｔは、温度変化率検出
回路８に入力され、時間に対する電池１の温度変化率に
対応した電圧値の出力Ｖｔ′が得られる。この温度変化
率検出回路８の出力Ｖｔ′は、充電初期や中期では０ま
たは０に近い値であるが、充電末期になると急激に上昇
する。電圧比較器９は、温度変化率検出回路８出力Ｖ
ｔ′と設定値Ｖｋ０を比較し、 Ｖｔ′≧Ｖｋ０Here, when the first charging period advances and approaches the end of charging soon, the temperature of the battery 1 starts to rise sharply as shown in FIG. 2 (b). The temperature of the battery 1 is converted by a temperature sensor 6 into an electric signal, and further converted by a temperature conversion circuit 7 into an output Vt having a voltage value substantially inversely proportional to the temperature. The output Vt of the temperature conversion circuit 7 is input to the temperature change rate detection circuit 8, and an output Vt 'having a voltage value corresponding to the temperature change rate of the battery 1 with respect to time is obtained. The output Vt 'of the temperature change rate detection circuit 8 is 0 or a value close to 0 in the initial stage or the middle stage of charging, but rapidly increases at the end of charging. The voltage comparator 9 outputs the temperature change rate detection circuit 8 output V
t 'is compared with the set value Vk0, and Vt' ≧ Vk0
【００２９】となった時点で、その出力が高レベルから
低レベルへと転じ、反転出力を発生する。この反転出力
は、ＮＯＲ回路１３を介して充電制御回路１４の入力端
子ａに入力される。この時点では、電池１はまだ１００
％には充電されていない。At this point, the output changes from the high level to the low level, and an inverted output is generated. This inverted output is input to the input terminal a of the charge control circuit 14 via the NOR circuit 13. At this point, battery 1 still has 100
% Is not charged.
【００３０】なお、充電回路の電源投入と同時に第１の
充電期間が開始するように構成した場合、第１の充電期
間の開始と同時に温度センサ６に電流が供給され始め
る。このため温度センサ６が自己発熱により若干温度上
昇を生じ、温度変化率検出回路８の出力Ｖｔ′が設定値
Ｖｋ０を越え、電圧比較器９が反転出力を発生すること
がある。この場合、第１の充電期間の開始後、電池１の
温度が上昇しなくとも第２の充電期間に移行してしま
い、充電不足になることがある。このような不具合を避
けるため、この実施例ではスタートパルスがＯＲ回路１
５を介して第４のタイマー１６に入力されることにより
ＮＯＲ回路１３の他方の入力端子を該タイマー１６の限
時時間ｔａの間だけ高レベルに保ち、この間は反転出力
が発生しても充電制御回路１４の入力端子ａに電圧比較
器９の反転出力が加わらないようにしている。When the first charging period is started at the same time when the power of the charging circuit is turned on, current is started to be supplied to the temperature sensor 6 simultaneously with the start of the first charging period. Therefore, the temperature sensor 6 slightly raises the temperature due to self-heating, the output Vt 'of the temperature change rate detection circuit 8 exceeds the set value Vk0, and the voltage comparator 9 may generate an inverted output. In this case, after the start of the first charging period, the battery 1 may shift to the second charging period even if the temperature of the battery 1 does not rise, resulting in insufficient charging. In order to avoid such a problem, in this embodiment, the start pulse is supplied to the OR circuit 1
5, the other input terminal of the NOR circuit 13 is kept at the high level only for the time limit ta of the timer 16, and during this time, the charging control is performed even if the inverted output occurs. The inverted output of the voltage comparator 9 is not applied to the input terminal a of the circuit 14.
【００３１】温度変換回路７の出力Ｖｔは電圧比較器１
０，１１，１２にも入力され、基準電圧Ｖｋ１，Ｖｋ
２，Ｖｋ３と比較される。電池１の温度が基準電圧Ｖｋ
１に相当する第１の設定温度Ｔ１まで上昇すると、電圧
比較器１０が検出出力を発生する。この検出出力は充電
制御回路１４の入力端子ｂに入力される。一方、第１の
タイマー１７は予め設定された時間（限時時間）ｔ１に
達すると、限時出力を発生する。この限時出力は充電制
御回路１４の入力端子ｊに入力される。The output Vt of the temperature conversion circuit 7 is
0, 11 and 12 and the reference voltages Vk1 and Vk
2, Vk3. The temperature of the battery 1 is equal to the reference voltage Vk.
When the temperature rises to the first set temperature T1 corresponding to 1, the voltage comparator 10 generates a detection output. This detection output is input to the input terminal b of the charge control circuit 14. On the other hand, when the first timer 17 reaches a preset time (time limit time) t1, it generates a time limit output. This timed output is input to the input terminal j of the charge control circuit 14.
【００３２】第１の充電期間中、充電制御回路１４は入
力端子ａにＯＲ回路１３を介して入力される電圧比較器
９の反転出力と、入力端子ｂに入力される電圧比較器１
０の検出出力および入力端子ｊに入力される第１のタイ
マー１７の限時出力を監視しており、これらのうち最初
に発生した出力により、切替回路２のスイッチを制御す
る出力信号を発生する出力端子がｇからｈに変化する。During the first charging period, the charging control circuit 14 outputs the inverted output of the voltage comparator 9 input to the input terminal a via the OR circuit 13 and the voltage comparator 1 input to the input terminal b.
It monitors the 0 detection output and the timed output of the first timer 17 input to the input terminal j, and outputs the output that generates the output signal for controlling the switch of the switching circuit 2 by the output generated first among them. The terminal changes from g to h.
【００３３】＜第２の充電期間＞上述のように第１の充
電期間において、電圧比較器９の反転出力、電圧比較器
１０の検出出力および第１のタイマー１７の限時出力の
いずれかの発生により、充電制御回路１４の出力端子ｈ
から出力信号が発生すると、切替回路２のスイッチＳＷ
２がオン状態となって第２の充電期間に移行する。この
第２の充電期間では、電池１は第２の充電用電源４から
電流Ｉ２で補充電され始める。また、これと同時に第２
のタイマー１８が起動される。<Second Charging Period> As described above, in the first charging period, any one of the inverted output of the voltage comparator 9, the detected output of the voltage comparator 10, and the timed output of the first timer 17 is generated. The output terminal h of the charge control circuit 14
Generates an output signal from the switch SW of the switching circuit 2
2 is turned on and shifts to the second charging period. In the second charging period, the battery 1 starts to be supplementarily charged by the current I2 from the second charging power supply 4. At the same time, the second
Is started.
【００３４】第２の充電期間において充電電流Ｉ２での
補充電が進み、ほぼ１００％充電が行われると、電池１
の温度が再び上昇し始める。電圧比較器９は、温度変化
率検出回路８の出力Ｖｔ′と設定値Ｖｋ０とを比較し、 Ｖｔ′≧Ｖｋ０In the second charging period, the auxiliary charging with the charging current I2 proceeds, and when almost 100% charging is performed, the battery 1
Temperature starts to rise again. The voltage comparator 9 compares the output Vt ′ of the temperature change rate detection circuit 8 with the set value Vk0, and Vt ′ ≧ Vk0
【００３５】となった時点で、その出力が高レベルから
低レベルへと転じ、反転出力を発生する。この反転出力
は、ＮＯＲ回路１３を介して充電制御回路１４の入力端
子ａに入力される。なお、第１の充電期間中に電池１の
温度が急上昇し、温度変化率検出回路８の出力Ｖｔ′が Ｖｔ′≧ｋ０At this point, the output changes from the high level to the low level, and an inverted output is generated. This inverted output is input to the input terminal a of the charge control circuit 14 via the NOR circuit 13. During the first charging period, the temperature of the battery 1 rises rapidly, and the output Vt ′ of the temperature change rate detection circuit 8 becomes Vt ′ ≧ k0
【００３６】となり、電圧比較器９が反転出力を発生し
て第２の充電期間に移行した場合、充電電流がＩ１から
Ｉ２へと減少しても、電池１の温度上昇率は暫くの間、
一定に保たれる。従って第２の充電期間に移行した直後
の温度変化率検出回路８の出力Ｖｔ′は、依然として Ｖｔ′≧ｋ０When the voltage comparator 9 generates an inverted output and shifts to the second charging period, even if the charging current decreases from I1 to I2, the rate of temperature rise of the battery 1 is maintained for a while.
Be kept constant. Therefore, the output Vt ′ of the temperature change rate detection circuit 8 immediately after the transition to the second charging period is still Vt ′ ≧ k0
【００３７】であり、電圧比較器９が反転出力を発生す
る。このため第２の充電期間が開始しても、直ぐに第３
の充電期間に移行してしまうことがあり、充電不足とな
ることがある。このような不具合を避けるため、この実
施例では充電制御回路１４の出力端子ｈより発生する出
力信号がＯＲ回路１５を介して第４のタイマー１６に入
力されることにより、ＮＯＲ回路１３の他方の入力端子
を該タイマー１６の限時時間ｔａの間だけ高レベルに保
ち、この間は反転出力が発生しても充電制御回路１４の
入力端子ａに電圧比較器９の反転出力が加わらないよう
にしている。The voltage comparator 9 generates an inverted output. Therefore, even if the second charging period starts, the third charging
The charging period may be shifted to the charging period, and the charging may be insufficient. In order to avoid such a problem, in this embodiment, an output signal generated from the output terminal h of the charge control circuit 14 is input to the fourth timer 16 via the OR circuit 15 so that the other of the NOR circuit 13 The input terminal is kept at a high level only during the time limit ta of the timer 16, and during this time, even if an inverted output occurs, the inverted output of the voltage comparator 9 is not applied to the input terminal a of the charge control circuit 14. .
【００３８】次に、電池１の温度が基準電圧Ｖｋ２に相
当する第２の設定温度Ｔ２まで上昇すると、電圧比較器
１１が検出出力を発生する。この検出出力は、充電制御
回路１４の入力端子ｃに入力される。一方、第２のタイ
マー１８は予め設定された時間（限時時間）ｔ２に達す
ると、限時出力を発生する。この限時出力は充電制御回
路１４の入力端子ｋに入力される。Next, when the temperature of the battery 1 rises to a second set temperature T2 corresponding to the reference voltage Vk2, the voltage comparator 11 generates a detection output. This detection output is input to the input terminal c of the charge control circuit 14. On the other hand, when the second timer 18 reaches a preset time (time limit time) t2, the second timer 18 generates a time limit output. This timed output is input to the input terminal k of the charge control circuit 14.
【００３９】第２の充電期間中、充電制御回路１４は入
力端子ａにＯＲ回路１３を介して入力される電圧比較器
９の反転出力と、入力端子ｃに入力される電圧比較器１
１の検出出力および入力端子ｋに入力される第２のタイ
マー１８の限時出力を監視しており、これらのうち最初
に発生した出力により、切替回路２のスイッチを制御す
る出力信号を発生する出力端子がｈからｉに変化する。During the second charging period, the charging control circuit 14 outputs the inverted output of the voltage comparator 9 input to the input terminal a via the OR circuit 13 and the voltage comparator 1 input to the input terminal c.
1 and a timed output of the second timer 18 inputted to the input terminal k, and an output which generates an output signal for controlling a switch of the switching circuit 2 is generated based on the first generated output. The terminal changes from h to i.
【００４０】＜第３の充電期間＞上述のように第２の充
電期間において、電圧比較器９の反転出力、電圧比較器
１１の検出出力および第２のタイマー１８の限時出力の
いずれかの発生により、充電制御回路１４の出力端子ｉ
から出力信号が発生すると、切替回路２のスイッチＳＷ
３がオン状態となって第３の充電期間に移行し、電池１
は第３の充電用電源５から電流Ｉ３で補充電され始め
る。また、これと同時に第３のタイマー１９が起動され
る。第３のタイマー１９は予め設定された時間（限時時
間）ｔ３に達すると、限時出力を発生する。この限時出
力は充電制御回路１４の入力端子ｌに入力される。<Third Charging Period> As described above, in the second charging period, any one of the inverted output of the voltage comparator 9, the detected output of the voltage comparator 11, and the timed output of the second timer 18 is generated. As a result, the output terminal i of the charge control circuit 14
Generates an output signal from the switch SW of the switching circuit 2
3 enters the ON state and shifts to the third charging period, and the battery 1
Starts to be supplementarily charged by the current I3 from the third charging power source 5. At the same time, the third timer 19 is started. When reaching a preset time (time limit time) t3, the third timer 19 generates a time limit output. This timed output is input to the input terminal 1 of the charge control circuit 14.
【００４１】第３の充電期間において充電が進み、それ
に伴い電池１の温度が上昇して温度変換回路７の出力Ｖ
ｔが第３の設定温度Ｔ３に相当する基準電圧Ｖｋ３に達
すると、電圧比較器１２は検出出力を発生する。In the third charging period, the charging proceeds, and the temperature of the battery 1 rises accordingly, and the output V of the temperature conversion circuit 7
When t reaches the reference voltage Vk3 corresponding to the third set temperature T3, the voltage comparator 12 generates a detection output.
【００４２】第３の充電期間中、充電制御回路１４は入
力端子ｄに入力される電圧比較器１２の検出出力および
入力端子ｌに入力される第３のタイマー１９の限時出力
を監視しており、これらのうち最初に発生した出力によ
り、出力端子ｉからの出力信号の発生を停止する。これ
により切替回路２のスイッチＳＷ３がオフ状態となっ
て、一連の充電動作が終了する。During the third charging period, the charging control circuit 14 monitors the detection output of the voltage comparator 12 input to the input terminal d and the timed output of the third timer 19 input to the input terminal l. , The generation of the output signal from the output terminal i is stopped by the first output. As a result, the switch SW3 of the switching circuit 2 is turned off, and a series of charging operations is completed.
【００４３】本発明は、次のように種々変形して実施が
可能である。例えば上記実施例において、第３の設定温
度Ｔ３を第１の設定温度Ｔ１と第２の設定温度Ｔ２とで
一義的に決定するようにしてもよい。すなわち、第３の
充電期間の充電電流Ｉ３は第１の充電期間の充電電流Ｉ
１に比較して小さい電流であるから、Ｉ３で過充電した
としたも電池１の温度上昇はほとんどない。電圧比較器
１２が検出出力を発生するのは、周囲温度が高い場合、
あるいは充電回路が故障してＩ３の電流値が異常に大き
くなった場合である。このため、第３の設定温度Ｔ３は
精度を必要としない。そこで、例えば第３の設定温度Ｔ
３に対応する基準電圧Ｖｋ３を第１および第２の設定温
度Ｔ１，Ｔ２に対応する基準電圧Ｖｋ１，Ｖｋ２から、
次のようにして求めてもよい。 Ｖｋ３＝２×Ｖｋ２−ｋ１ この場合、第３の設定温度Ｔ３は第１および第２の設定
温度Ｔ１，Ｔ２に対して、 Ｔ３＝２×Ｔ２−Ｔ１ の関係に設定される。このようにすると、設定が容易と
なる。The present invention can be implemented with various modifications as follows. For example, in the above-described embodiment, the third set temperature T3 may be uniquely determined from the first set temperature T1 and the second set temperature T2. That is, the charging current I3 during the third charging period is equal to the charging current I3 during the first charging period.
Since the current is smaller than that of the battery 1, there is almost no temperature rise of the battery 1 even if the battery 1 is overcharged. The voltage comparator 12 generates a detection output when the ambient temperature is high.
Alternatively, this is a case where the charging circuit has failed and the current value of I3 has become abnormally large. Therefore, the third set temperature T3 does not require accuracy. Therefore, for example, the third set temperature T
3 from the reference voltages Vk1 and Vk2 corresponding to the first and second set temperatures T1 and T2, respectively.
It may be obtained as follows. Vk3 = 2 × Vk2-k1 In this case, the third set temperature T3 is set to have a relationship of T3 = 2 × T2-T1 with respect to the first and second set temperatures T1 and T2. This facilitates the setting.
【００４４】また、実施例では電圧比較器９の反転出力
の発生による充電制御回路１４の制御動作を禁止する時
間を、第１および第２の充電期間のそれぞれの開始から
の時間とも第４のタイマー１６の限時時間ｔａとした
が、タイマーをさらに追加することにより、これらの制
御動作禁止時間を異ならせてもよい。その場合、第１の
充電期間の開始からの制御動作禁止時間Ｔａと、第２の
充電期間の開始からの制御動作禁止時間Ｔｂとの関係を
Ｔａ≦Ｔｂに設定することが望ましい。In the embodiment, the time during which the control operation of the charging control circuit 14 is inhibited by the generation of the inverted output of the voltage comparator 9 is set to the fourth time from the start of each of the first and second charging periods. Although the time limit ta of the timer 16 is used, the control operation prohibition time may be changed by adding a timer. In this case, it is desirable to set the relationship between the control operation prohibition time Ta from the start of the first charging period and the control operation prohibition time Tb from the start of the second charging period to Ta ≦ Tb.
【００４５】また、第３のタイマー１９の限時時間を無
限大にしてもよく、また第３の充電期間終了後も微小電
流で充電を続けてもよい。このようにすると、電池の自
己放電による電池容量の減少を防ぐことができる。Further, the time limit of the third timer 19 may be set to infinity, and charging may be continued with a small current after the end of the third charging period. This can prevent a decrease in battery capacity due to self-discharge of the battery.
【００４６】さらに、充電開始時に電池のテストを行
い、所定の条件を満たしたとき第１の充電期間を開始す
るようにしても良い。例えば充電開始時に電流Ｉ２で充
電し、電池１の電圧が所定の範囲内で、電池の温度が所
定の範囲内の場合に第１の充電期間を開始し、充電開始
時から所定時間経過しても電池の電圧と電池の温度がそ
れぞれ所定の範囲内に入らない場合は、第１の充電期間
を開始させないようにしてもよい。Further, the battery may be tested at the start of charging, and the first charging period may be started when a predetermined condition is satisfied. For example, the battery is charged with the current I2 at the start of charging, the first charging period is started when the voltage of the battery 1 is within a predetermined range and the temperature of the battery is within a predetermined range, and a predetermined time has elapsed since the start of charging. If the battery voltage and the battery temperature do not fall within the predetermined ranges, the first charging period may not be started.
【００４７】[0047]
【発明の効果】以上説明したように本発明による充電回
路は、Ｉ１，Ｉ２，Ｉ３なる電流（但し、Ｉ１≧Ｉ２≧
Ｉ３）を出力する第１〜第３の充電用電源と、二次電池
に対し第１〜第３の充電期間に充電用電源をそれぞれ接
続する切替回路と、電池の温度がＴ１，Ｔ２，Ｔ３なる
設定温度（但し、Ｔ１≦Ｔ２≦Ｔ３）にそれぞれ達した
ことを検出する第１〜第３の温度検出器と、電池の温度
変化率を検出する温度変化率検出回路と、温度変化率検
出回路の出力値と設定値を比較する比較器と、第１〜第
３の充電期間のそれぞれの開始と同時に起動される第１
〜第３のタイマーと、第１〜第３の温度検出回路と比較
器および第１〜第３のタイマーの出力により切替回路を
制御する充電制御回路とを有し、第１および第２の充電
期間では電池の温度変化率が設定値に達するか、電池の
温度が設定温度Ｔ１，Ｔ２に達するか、または充電時間
が設定値に達するかのいずれかの条件が満たされたとき
次の段階の充電期間に移行し、第３の充電期間では電池
の温度が設定温度Ｔ３に達するか、または充電時間が所
定値に達するかのいずれかの条件か満たされたときに充
電が終了する。As described above, in the charging circuit according to the present invention, the currents I1, I2 and I3 (where I1 ≧ I2 ≧
I3), a switching circuit for connecting the charging power supply to the secondary battery during the first to third charging periods, and a battery temperature T1, T2, T3. A first to a third temperature detector for detecting that the temperature has reached a predetermined set temperature (where T1 ≦ T2 ≦ T3), a temperature change rate detection circuit for detecting a temperature change rate of the battery, and a temperature change rate detection A comparator for comparing the output value of the circuit with the set value; and a first activated at the same time as the start of each of the first to third charging periods.
And a third timer, a charge control circuit for controlling the switching circuit based on the outputs of the first to third temperature detection circuits, the comparator and the first to third timers, and In the period, when any one of the following conditions is satisfied: the temperature change rate of the battery reaches the set value, the battery temperature reaches the set temperatures T1 and T2, or the charging time reaches the set value. The operation shifts to a charging period, and in the third charging period, the charging ends when either the temperature of the battery reaches the set temperature T3 or the charging time reaches a predetermined value.
【００４８】従って、短時間でほぼ１００％の充電が可
能であり、電池の温度が高い場合でも充電不足になるこ
とはない。さらに、第１および第２充電期間では電池の
温度変化率、電池の温度および充電時間に基づく３重の
充電制御を行い、第３の充電期間では電池の温度および
充電時間に基づく２重の充電制御を行うため、安全性が
向上するという利点がある。Accordingly, it is possible to charge almost 100% in a short time, and there is no shortage of charge even when the battery temperature is high. Further, in the first and second charging periods, triple charging control based on the temperature change rate of the battery, the battery temperature and the charging time is performed, and in the third charging period, double charging based on the battery temperature and the charging time is performed. Since control is performed, there is an advantage that safety is improved.
【図１】本発明の一実施例に係る二次電池の充電回路の
構成を示すブロック図FIG. 1 is a block diagram showing a configuration of a charging circuit for a secondary battery according to one embodiment of the present invention.
【図２】図１の充電回路の動作を説明するための波形図FIG. 2 is a waveform chart for explaining the operation of the charging circuit of FIG. 1;
１…二次電池 ２…切替回路 ３…第１の充電用電源 ４…第２の充電
用電源 ５…第３の充電用電源 ６…温度センサ ７…温度変換回路 ８…温度変化率
検出回路 ９〜１２…電圧比較器 １４…充電制御
回路DESCRIPTION OF SYMBOLS 1 ... Secondary battery 2 ... Switching circuit 3 ... First charging power supply 4 ... Second charging power supply 5 ... Third charging power supply 6 ... Temperature sensor 7 ... Temperature conversion circuit 8 ... Temperature change rate detection circuit 9 -12: Voltage comparator 14: Charge control circuit
Claims (1)
３の関係を有するＩ１，Ｉ２およびＩ３なる電流をそれ
ぞれ出力する第１、第２および第３の充電用電源と、 前記二次電池に対し第１の充電期間に第１の充電用電
源、第２の充電期間に第２の充電用電源、第３の充電期
間に第３の充電用電源をそれぞれ接続する切替手段と、 前記二次電池の温度がＴ１≦Ｔ２≦Ｔ３の関係を有する
Ｔ１，Ｔ２およびＴ３なる第１、第２および第３の設定
温度にそれぞれ達したことを検出して検出出力を発生す
る第１、第２および第３の温度検出手段と、 前記二次電池の時間に対する温度変化率を検出する温度
変化率検出手段と、 前記二次電池の充電中の前記温度変化率検出手段の出力
値と設定値とを比較して、出力値が設定値に達したとき
反転出力を発生する比較手段と、 第１、第２および第３の充電期間のそれぞれの開始と同
時に起動される第１、第２および第３のタイマーと、 第１の充電期間中に前記比較手段の反転出力、前記第１
の温度検出手段の検出出力および前記第１のタイマーの
限時出力のいずれかが発生したとき第２の充電期間に移
行し、第２の充電期間中に前記比較手段の反転出力、前
記第２の温度検出手段の検出出力および前記第２のタイ
マーの限時出力のいずれかが発生したとき第３の充電期
間に移行し、第３の充電期間中に前記第３の温度検出手
段の検出出力および前記第３のタイマーの限時出力のい
ずれかが発生したとき第３の充電期間を終了するように
前記切替手段を制御する制御手段と、 第１および第２の充電期間のそれぞれの開始から所定時
間の間は前記比較手段の反転出力の発生による前記制御
手段の制御動作を禁止する手段とを具備することを特徴
とする二次電池の充電回路。1. I1 ≧ I2 ≧ I for charging a secondary battery
First to it <br/> respectively outputs I1, I2 and I3 become current with the relation 3, first the second and the third and charging power source, a first charging period to said secondary battery Switching means for connecting the first charging power supply, the second charging power supply during the second charging period, and the third charging power supply during the third charging period, respectively, wherein the temperature of the secondary battery is T1 ≦ T2 ≦ T1 have a relationship of T3, T2 and T3 becomes the first, the first, second and third for generating a detection output by detecting that has reached each of the second and third setting <br/> temperature Temperature detection means, a temperature change rate detection means for detecting a temperature change rate with respect to time of the secondary battery, and comparing an output value and a set value of the temperature change rate detection means during charging of the secondary battery. A comparison means for generating an inverted output when the output value reaches a set value; The first is activated each simultaneously with the start of the electric period, the second and third timer, the inverted output of the comparison means during a first charging period, the first
When one of the detection output of the temperature detecting means and the timed output of the first timer is generated, the process proceeds to the second charging period, and the inverted output of the comparing means and the second output during the second charging period. When one of the detection output of the temperature detection means and the timed output of the second timer is generated, the process proceeds to a third charging period, and the detection output of the third temperature detection means and the detection output of the third timer during the third charging period. Control means for controlling the switching means so as to end the third charging period when any of the timed outputs of the third timer is generated; and for a predetermined time from the start of each of the first and second charging periods. Means for prohibiting the control operation of the control means due to the generation of the inverted output of the comparison means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02923792A JP3151275B2 (en) | 1992-02-17 | 1992-02-17 | Rechargeable battery charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02923792A JP3151275B2 (en) | 1992-02-17 | 1992-02-17 | Rechargeable battery charging circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05227673A JPH05227673A (en) | 1993-09-03 |
| JP3151275B2 true JP3151275B2 (en) | 2001-04-03 |
Family
ID=12270631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02923792A Expired - Fee Related JP3151275B2 (en) | 1992-02-17 | 1992-02-17 | Rechargeable battery charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3151275B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403763A (en) * | 2011-10-28 | 2012-04-04 | 重庆恒通客车有限公司 | Quick double-pistol charging system and method for electric motor coach |
-
1992
- 1992-02-17 JP JP02923792A patent/JP3151275B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403763A (en) * | 2011-10-28 | 2012-04-04 | 重庆恒通客车有限公司 | Quick double-pistol charging system and method for electric motor coach |
| CN102403763B (en) * | 2011-10-28 | 2014-01-29 | 重庆恒通客车有限公司 | Quick double-pistol charging system and method for electric motor coach |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05227673A (en) | 1993-09-03 |
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