JP2712873B2 - Battery charge monitoring circuit - Google Patents
Battery charge monitoring circuitInfo
- Publication number
- JP2712873B2 JP2712873B2 JP3114238A JP11423891A JP2712873B2 JP 2712873 B2 JP2712873 B2 JP 2712873B2 JP 3114238 A JP3114238 A JP 3114238A JP 11423891 A JP11423891 A JP 11423891A JP 2712873 B2 JP2712873 B2 JP 2712873B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- battery
- resistor
- capacitor
- charging
- 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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はバッテリ充電状態監視回
路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charge state monitoring circuit.
【０００２】[0002]
【従来の技術】従来のバッテリ充電状態監視回路は、マ
イクロコンピュータを使用し、バッテリの充電電圧の最
大値を記憶すると共に、この記憶した充電電圧の最大値
とバッテリの現在の電圧値とを常に比較し、記憶してい
る充電電圧の最大値よりバッテリの現在の電圧値が予め
定める値以上減少すると、バッテリ充電完了と認知し、
充電完了信号を送出している。2. Description of the Related Art A conventional battery state-of-charge monitoring circuit uses a microcomputer to store a maximum value of a battery charging voltage, and constantly stores the maximum value of the stored charging voltage and a current voltage value of the battery. When the current voltage value of the battery is reduced by a predetermined value or more from the maximum value of the stored charging voltage, it is recognized that the battery charging is completed,
A charge completion signal is sent.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来のバッテ
リ充電状態監視回路は、マイクロコンピュータを含む回
路を必要とするので高価であり、一度設計を完了する
と、異なるバッテリを使用する場合には変更のための工
数を必要とするので、経済的な負担が大きいという問題
点がある。The conventional battery charge state monitoring circuit described above is expensive because it requires a circuit including a microcomputer, and once the design is completed, it can be changed when a different battery is used. Therefore, there is a problem that an economic burden is large because the number of man-hours required for the operation is large.
【０００４】本発明の目的は、簡単な回路構成で機能
し、異なるバッテリを使用する場合にも回路定数を変更
するのみで容易に対応でき、経済的な負担が小さくてす
むバッテリ充電状態監視回路を提供することにある。An object of the present invention is to provide a battery charge state monitoring circuit which functions with a simple circuit configuration, can easily cope with the use of different batteries only by changing circuit constants, and has a small economical burden. Is to provide.
【０００５】[0005]
【課題を解決するための手段】本発明のバッテリ充電状
態監視回路は、充電回路と接続するバッテリの充電電圧
の最大値を一時的に記憶するためのコンデンサと、この
コンデンサと前記バッテリとの間に設ける第１のダイオ
ードと、前記コンデンサの両端に設ける放電用の第１の
抵抗器と、前記充電電圧の現在値を検出するための第２
の抵抗器と、この第２の抵抗器と正電源との間を接続す
る第３の抵抗器と、前記第２および第３の抵抗器の接続
点と前記バッテリとの間に設け前記第１のダイオードの
温度特性を補償するための第２のダイオードと、一方の
入力端が前記コンデンサと接続し他方の入力端が前記第
２および第３の抵抗器の接続点と接続する比較器とを有
し、前記比較器の出力を前記バッテリの充電状態信号と
して出力する構成である。According to the present invention, there is provided a battery charge state monitoring circuit comprising: a capacitor for temporarily storing a maximum value of a charging voltage of a battery connected to the charging circuit; and a capacitor between the capacitor and the battery. A first resistor for discharging provided at both ends of the capacitor, and a second diode for detecting a current value of the charging voltage.
A third resistor connecting between the second resistor and the positive power supply; and a first resistor provided between a connection point of the second and third resistors and the battery. And a comparator having one input terminal connected to the capacitor and the other input terminal connected to a connection point of the second and third resistors. And outputting the output of the comparator as a charge state signal of the battery.
【０００６】[0006]
【０００７】[0007]
【０００８】[0008]
【実施例】次に、本発明の実施例について図面を参照し
て説明する。Next, embodiments of the present invention will be described with reference to the drawings.
【０００９】図１は本発明の一実施例の回路図である。FIG. 1 is a circuit diagram of one embodiment of the present invention.
【００１０】本発明のバッテリ充電状態監視回路１０
は、充電回路１と接続するバッテリ２の充電電圧ＶB の
最大値を一時的に記憶するためのコンデンサ３と、この
コンデンサ３とバッテリ２との間に設けるダイオード４
と、コンデンサ３の両端に設ける放電用の抵抗器５と、
充電電圧ＶB の現在値を検出するための抵抗器６と、抵
抗器６と正電源Ｖ＋ との間を接続する抵抗器７と、抵
抗器６，７の接続点とバッテリ２との間に設けダイオー
ド４の温度特性を補償するためのダイオード８と、一方
の入力端がコンデンサ３と接続し他方の入力端が抵抗器
６，７の接続点と接続する比較器９とを有している。な
お、コンデンサ３の電位を電圧ｖi1とし、抵抗器６，７
の接続点の電位を電圧ｖi2、比較器９の出力を電圧ｖ0
とする。[0010] The battery charge state monitoring circuit 10 of the present invention.
Diode is provided between the condenser 3 for temporarily storing the maximum value of the charging voltage V B of the battery 2 to be connected to the charging circuit 1, and the capacitor 3 and the battery 2 4
And a discharge resistor 5 provided at both ends of the capacitor 3;
Between the resistor 6 for detecting the current value of the charging voltage V B, a resistor 6 and the resistor 7 for connecting the positive power source V +, the connection point between the battery 2 of the resistor 6 and 7 And a comparator 9 having one input terminal connected to the capacitor 3 and the other input terminal connected to the connection point of the resistors 6 and 7. I have. Note that the potential of the capacitor 3 is set to the voltage vi1 and the resistors 6, 7
Is the voltage v i2 , and the output of the comparator 9 is the voltage v 0.
And
【００１１】図２は図１の各部の電圧波形図である。分
図（Ａ）は充電電圧ＶB の時間による変化を示し、分図
（Ｂ）は電圧ｖi1と電圧ｖi2と電圧ｖ0 との時間による
変化を示している。FIG. 2 is a voltage waveform diagram of each part in FIG. Min Figure (A) shows the variation with time of the charging voltage V B, min Figure (B) shows a change with time of the voltage v i1 and the voltage v i2 and the voltage v 0.
【００１２】分図（Ａ）は区間Ｔ1 で充電電圧ＶB が単
調に増加し、以後区間Ｔ2 で―ΔＶだけ電圧が下ること
を示している。[0012] partial view (A) increases monotonically the charging voltage V B at period T 1, shows that down voltage only -ΔV in subsequent sections T 2.
【００１３】分図（Ｂ）は充電電圧ＶB の変化に伴なう
比較器の入出力電圧の変化を示している。[0013] partial view (B) shows the change in the output voltage of the accompanying comparator to a change in the charging voltage V B.
【００１４】次に動作について説明する。主として図１
を使用し、必要に応じて図２を引用する。Next, the operation will be described. Mainly Figure 1
And referring to FIG. 2 as necessary.
【００１５】充電回路１から充電を開始すると、バッテ
リ２の充電電圧ＶBの最大値は、ダイオード４を介して
コンデンサ３が、充電電圧ＶB の電圧変化を検出するに
十分な時間だけ記憶する。ここで、コンデンサ３と抵抗
器６との値から決まる時定数は十分大きくなるよう選択
する。したがって、充電電圧ＶB の電圧変化に比べ、コ
ンデンサ３の電位の変化は遅く、充電電圧ＶB の電圧変
化を検出するに十分な時間だけ最大値を保っているとい
える。又、充電電圧ＶB は、ダイオード８を介して抵抗
器６で検出する。この抵抗器６の示す電圧ｖi2は、正電
源Ｖ＋ と抵抗器７とにより、正極側に若干レベルシフ
トしている。このため、図２分図（Ａ）に示す、充電電
圧ＶB が徐々に上昇している区間Ｔ1 では、図２分図
（Ｂ）に示すように、抵抗器６の示す電圧ｖi2がコンデ
ンサ３の示す電圧ｖi1より常に高い。したがって、比較
器９の出力電圧ｖ0 は、ハイレベルとなりバッテリ充電
完了信号は発生しない。[0015] When starting the charging from the charging circuit 1, the maximum value of the charging voltage V B of the battery 2, the capacitor 3 via the diode 4 is stored for a time sufficient to detect the voltage change of the charging voltage V B . Here, the time constant determined by the values of the capacitor 3 and the resistor 6 is selected to be sufficiently large. Therefore, compared with the voltage change of the charging voltage V B, the change in potential of the capacitor 3 is slow, it can be said that keeping the maximum time sufficient to detect the voltage change of the charging voltage V B. The charging voltage V B is detected by the resistor 6 via the diode 8. The voltage vi 2 indicated by the resistor 6 is slightly level-shifted to the positive electrode side by the positive power supply V + and the resistor 7. Therefore, shown in FIG. 2 partial diagram (A), in the section T 1 is the charging voltage V B is gradually increased, as shown in FIG. 2 partial diagram (B), the voltage v i2 indicated by the resistor 6 It is always higher than the voltage v i1 indicated by the capacitor 3. Therefore, the output voltage v 0 of the comparator 9 becomes high level, and no battery charge completion signal is generated.
【００１６】次にさらにバッテリの充電が進み、充電が
ほぼ完了すると、充電電圧ＶB は、区間Ｔ2 で―ΔＶだ
け最大から逆に低下する現象が見られる。このとき、コ
ンデンサ３の示す電圧ｖi1は、ほぼ充電電圧ＶB のピー
ク値を保持する。一方、抵抗器６の示す電圧ｖi2は、充
電電圧ＶB と共に変化するため、ｖi1＝ｖi2ととなる時
刻ｔA が現われ、さらに時間の経過と共に、ｖi1＞ｖi2
となる。ｖi1＞ｖi2となると比較器９の出力電圧ｖ
0 は、ロウレベルとなりバッテリ充電完了信号を発生す
ることになる。この信号は、バッテリ充電停止信号ある
いは充電完了表示等に使用する。Next, when the charging of the battery further proceeds and the charging is almost completed, a phenomenon is seen in which the charging voltage V B decreases from the maximum by -ΔV in the section T 2 . At this time, the voltage v i1 indicated by capacitor 3 holds a substantially peak value of the charging voltage V B. On the other hand, the voltage v i2 indicated by the resistor 6, in order to change over the charging voltage V B, v i1 = v i2 and time t A appeared to become further over time, v i1> v i2
Becomes When v i1 > v i2 , the output voltage v of the comparator 9 becomes
0 becomes low level, and a battery charge completion signal is generated. This signal is used as a battery charge stop signal or a charge completion display.
【００１７】ダイオード８は、温度変化により、ダイオ
ード４の電圧特性が変化しても、同様に変化して温度補
償の働きをして充電完了検出を、常に正確に行うことが
できる。さらに、―ΔＶの電圧値にかかわらず、抵抗器
６，７の値を適切に選択すれば、確実に前述のような検
出を行うことができることも明らかである。Even if the voltage characteristic of the diode 4 changes due to a temperature change, the diode 8 changes in the same manner and functions as a temperature compensator to always accurately detect the completion of charging. Further, it is apparent that the above-described detection can be reliably performed by appropriately selecting the values of the resistors 6 and 7 regardless of the voltage value of −ΔV.
【００１８】[0018]
【発明の効果】以上説明したように、本発明は、バッテ
リの充電電圧を監視し、バッテリの充電電圧のピーク電
圧を記憶回路で記憶し、バッテリの充電電圧の現在値
が、記憶回路の記憶しているピーク電圧より低いこと
を、比較回路で検出して、バッテリの充電完了と判定す
るようにしたので、簡単な回路構成で機能し、異なるバ
ッテリを使用する場合にも回路定数を変更するのみで容
易に対応でき、経済的な負担が小さくてすむという効果
が有る。As described above, according to the present invention, the battery charging voltage is monitored, the peak voltage of the battery charging voltage is stored in the storage circuit, and the current value of the battery charging voltage is stored in the storage circuit. The comparison circuit detects that the voltage is lower than the peak voltage of the battery, and determines that the battery is fully charged. Therefore, the circuit functions with a simple circuit configuration, and changes the circuit constant even when a different battery is used. This can be easily dealt with only by itself, and has the effect of reducing the economic burden.
【図１】本発明の一実施例の回路図である。FIG. 1 is a circuit diagram of one embodiment of the present invention.
【図２】図１の各部の電圧波形図である。FIG. 2 is a voltage waveform diagram of each part in FIG.
１ 充電回路 ２ バッテリ ３ コンデンサ ４，８ ダイオード ５，６，７ 抵抗器 ９ 比較器 １０ バッテリ充電状態監視回路 ＶB 充電電圧 ｖi1 コンデンサ３の示す電圧 ｖi2 抵抗器６の示す電圧 ｖ0 比較器９の出力電圧1 the charging circuit 2 battery 3 capacitors 4,8 diode 5,6,7 resistor 9 comparator 10 battery state monitoring circuit V B charge voltage v i1 voltage v 0 comparator indicated by the voltage v i2 resistor 6 indicated by the capacitor 3 9 output voltage
Claims (1)
の最大値を一時的に記憶するためのコンデンサと、この
コンデンサと前記バッテリとの間に設ける第１のダイオ
ードと、前記コンデンサの両端に設ける放電用の第１の
抵抗器と、前記充電電圧の現在値を検出するための第２
の抵抗器と、この第２の抵抗器と正電源との間を接続す
る第３の抵抗器と、前記第２および第３の抵抗器の接続
点と前記バッテリとの間に設け前記第１のダイオードの
温度特性を補償するための第２のダイオードと、一方の
入力端が前記コンデンサと接続し他方の入力端が前記第
２および第３の抵抗器の接続点と接続する比較器とを有
し、前記比較器の出力を前記バッテリの充電状態信号と
して出力することを特徴とするバッテリ充電状態監視回
路。 1. A capacitor for temporarily storing a maximum value of a charging voltage of a battery connected to a charging circuit, a first diode provided between the capacitor and the battery, and provided at both ends of the capacitor. A first resistor for discharging, and a second resistor for detecting a current value of the charging voltage.
A third resistor connecting between the second resistor and the positive power supply; and a first resistor provided between a connection point of the second and third resistors and the battery. And a comparator having one input terminal connected to the capacitor and the other input terminal connected to a connection point of the second and third resistors. And outputting the output of the comparator as a charge state signal of the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3114238A JP2712873B2 (en) | 1991-05-20 | 1991-05-20 | Battery charge monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3114238A JP2712873B2 (en) | 1991-05-20 | 1991-05-20 | Battery charge monitoring circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04344135A JPH04344135A (en) | 1992-11-30 |
| JP2712873B2 true JP2712873B2 (en) | 1998-02-16 |
Family
ID=14632728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3114238A Expired - Fee Related JP2712873B2 (en) | 1991-05-20 | 1991-05-20 | Battery charge monitoring circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2712873B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61227644A (en) * | 1985-04-01 | 1986-10-09 | 三洋電機株式会社 | Quick charger |
| JPH0797893B2 (en) * | 1987-01-20 | 1995-10-18 | 富士通株式会社 | Peak voltage detection circuit in charging device |
-
1991
- 1991-05-20 JP JP3114238A patent/JP2712873B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04344135A (en) | 1992-11-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19970930 |
|
| LAPS | Cancellation because of no payment of annual fees |